JP2018037965A - Wearable camera system and communication control method - Google Patents

Abstract

An object of the present invention is to suppress an unnecessary increase in battery consumption of a wearable camera and to transmit a captured image in real time. A wearable camera system includes a wearable camera that can be worn or held by a user and a communication terminal, and a server that is communicably connected to the communication terminal. The wearable camera is connected to the communication terminal using the first communication mode, and when the captured video obtained by capturing the imaging area is transmitted to the server via the communication terminal, the wearable camera switches from the first communication mode to the second communication mode, The captured image is transmitted to the communication terminal using the two communication modes. The communication terminal switches from the first communication mode to the second communication mode in conjunction with the switching to the second communication mode in the wearable camera, and transfers the captured image transmitted from the wearable camera to the server using the second communication mode. . [Selection] Figure 8

Description

  The present invention relates to a wearable camera system and a communication control method for controlling communication between a wearable camera that can be worn or held by a user and an external device.

  In recent years, in order to efficiently support the work of a user (for example, police officer), for example, an operation for wearing or possessing a wearable camera by a police officer at the time of patrol has been studied.

  As a prior art of a monitoring system using a wearable camera, for example, there is a wearable monitoring camera system described in Patent Document 1. The wearable surveillance camera system of Patent Document 1 can record an image signal from a CCD camera attached to the body and an audio signal from a microphone. The wearable surveillance camera system has a communication card, and can transfer data such as video to the center server device via the communication card. In addition, the wearable surveillance camera system includes a battery that supplies power to a CCD camera, a microphone, a communication card, and the like.

  In such a wearable camera system, for example, video data captured by the wearable camera is transferred to a server and recorded in a storage, and the video data is stored so that it can be searched and viewed later. .

JP 2006-148842 A

  However, in the configuration of Patent Document 1, when video data captured by a wearable camera is transmitted to a server via a wireless router using a wireless LAN, power is consumed if the wearable camera is always connected to the wireless router. However, the capacity of the battery for supplying power to the communication card may be insufficient, which may hinder use. For example, when the battery runs out during the transmission of the video data, the transmission of the video data is interrupted.

  On the other hand, as short-range wireless communication with low battery consumption, for example, when trying to transmit video data using BLE (Bluetooth Low Energy: Bluetooth (registered trademark)), the communication speed becomes slow, and the wearable camera Video data could not be sent to the server in real time.

  The present invention is devised in view of the above-described conventional situation, and provides a wearable camera system and a communication control method capable of suppressing an unnecessary increase in battery consumption of a wearable camera and transmitting captured images in real time. With the goal.

  The present invention is a wearable camera system including a wearable camera and a communication terminal that can be worn or held by a user, and a server that is communicably connected to the communication terminal, wherein the wearable camera has a first communication mode. When the captured image obtained by capturing the imaged area with the communication terminal is transmitted to the server via the communication terminal, the first communication mode is switched to the second communication mode, and the second communication mode is selected. The captured video is transmitted to the communication terminal using the communication terminal, and the communication terminal switches from the first communication form to the second communication form in conjunction with the switch to the second communication form in the wearable camera, Provided a wearable camera system for transferring the captured image transmitted from the wearable camera to the server using a second communication mode That.

  The present invention also relates to a communication control method in a wearable camera system including a wearable camera and a communication terminal that can be worn or held by a user, and a server that is communicably connected to the communication terminal. Switches from the first communication mode to the second communication mode when connecting to the communication terminal using the first communication mode and transmitting the captured video obtained by imaging the imaging area to the server via the communication terminal. The captured video is transmitted to the communication terminal using the second communication form, and the communication terminal is switched from the first communication form to the second in conjunction with switching to the second communication form in the wearable camera. Switching to a communication mode and transferring the captured video transmitted from the wearable camera to the server using the second communication mode. To provide a method.

  ADVANTAGE OF THE INVENTION According to this invention, the useless increase in the battery consumption of a wearable camera can be suppressed, and a captured image can be transmitted in real time.

Explanatory drawing which shows an example of schematic structure of the wearable camera system of each embodiment The figure which shows an example of the upper body of the police officer equipped with the wearable camera of each embodiment Front view showing an example of the front side surface of the housing of the wearable camera of each embodiment A block diagram showing an example of a hardware configuration of a wearable camera of each embodiment The block diagram which shows an example of the hardware constitutions of the smart phone of each embodiment Block diagram showing an example of the hardware configuration of a back-end streaming server Block diagram showing an example of the hardware configuration of the back-end server Block diagram showing an example of the hardware configuration of a back-end client A diagram showing a configuration example of streaming video data FIG. 5 is a sequence diagram for explaining in detail an example of a streaming operation procedure started in response to a streaming start operation of the wearable camera in the first embodiment. A sequence diagram for explaining in detail an example of a streaming operation procedure started in response to a streaming start operation from a back-end client in the first embodiment The flowchart explaining in detail an example of the operation | movement procedure of the streaming delivery of the wearable camera in 1st Embodiment. The flowchart explaining in detail an example of the operation | movement procedure of the streaming delivery of the smart phone in 1st Embodiment. The perspective view which shows the external appearance example of the collective charging stand in which the wearable camera of 2nd Embodiment is mounted (set) The perspective view which shows an example of the back surface of the housing | casing of the wearable camera of each embodiment The sequence diagram explaining in detail the 1st example of the data transfer operation | movement from the wearable camera in 2nd Embodiment. Sequence diagram for explaining in detail a second example of the data transfer operation from the wearable camera in the second embodiment

(Background to the contents of the first embodiment)
As a conventional technique, for example, in the configuration of Patent Document 1, when video data captured by a wearable camera is transmitted to a server via a wireless router using a wireless LAN, the wearable camera is always connected to the wireless router. The battery that consumes power and supplies power to the communication card may be insufficient, which may hinder use. For example, when the battery runs out during the transmission of the video data, the transmission of the video data is interrupted.

  On the other hand, as short-range wireless communication with low battery consumption, for example, when trying to transmit video data using BLE (Bluetooth Low Energy: Bluetooth (registered trademark)), the communication speed becomes slow, and the wearable camera Video data could not be sent to the server in real time.

  Therefore, in the first embodiment, in view of the above-described conventional situation, an example of a wearable camera system and a communication control method capable of suppressing an unnecessary increase in battery consumption of a wearable camera and transmitting captured images in real time. Will be explained.

  Hereinafter, embodiments that specifically disclose a wearable camera system and a communication control method according to the present invention will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art. The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

(First embodiment)
Hereinafter, the wearable camera of each embodiment can be worn or held by a police officer as an example of a user. However, the user of the wearable camera is not limited to a police officer, and may be an employee such as a guard or a store. FIG. 1 is an explanatory diagram illustrating an example of a schematic configuration of a wearable camera system 5 according to each embodiment. The wearable camera system 5 includes a wearable camera 10 worn in the uniform of the police officer 3 (see FIG. 2) or possessed by the police officer 3, and an in-vehicle camera mounted on a patrol car (hereinafter abbreviated as “patrol car”). The system includes a system (ICV (In Car Video) system) 30 and a station system 8 installed in the police station 4.

  Wearable camera 10, when worn in the uniform of police officer 3, takes an image of the area (imaging area) in front of police officer 3 (in other words, the direction of travel of police officer 3) as the subject, It transmits to the system 8 and the in-vehicle camera system 30. Here, although the case where imaged video data is transmitted is shown, audio data collected by the microphone 29A (see FIG. 4) of the wearable camera 10 may be transmitted together with or instead of the imaged video data, The same applies to the following description.

  The captured video data captured by the wearable camera 10 is transmitted to the in-station system 8 as streaming video data. The captured video data is video data captured by the wearable camera 10 at the incident site, for example, when the police officer 3 goes to the incident site or during patrol. The subject to be imaged by the wearable camera 10 is not only a main person (eg, suspect, suspect, reference person, witness), but also a crowd (so-called field horse) that gathers near the scene. It is assumed that the scene around the scene and the atmosphere around the imaging position are also included.

  The police officer 3 wears or possesses a smartphone 80 as a communication terminal capable of communicating with the wearable camera 10. The smartphone 80 has a telephone function and a wireless communication function. For example, the smartphone 80 is used at the time of emergency contact from the police station 4 or emergency contact to the police station 4, and is used as a general-purpose portable terminal.

  When the police officer 3 wearing the wearable camera 10 in a uniform is at the scene, the wearable camera 10 is connected to the smartphone 80 using a communication form (for example, BLE (Bluetooth Low Energy)) capable of short-range wireless communication with low power consumption. Is done. However, since BLE has a low communication speed of about 100 kbps, it is not suitable for long-time video data transfer. Using the BLE, the smartphone 80 reproduces captured video data such as a moving image captured by the wearable camera 10 or displays a snapshot (that is, captured image data such as a still image). In addition, it is possible to add metadata (see below) to the captured video data in accordance with the operation of the police officer 3. The short-range wireless communication may be other communication standards such as Bluetooth (registered trademark) or Felica (registered trademark) before version 4.0, regardless of BLE.

  The wearable camera 10 can be connected to a back-end streaming server (BSS) 60 in the in-station system 8 via the smartphone 80. That is, wearable camera 10 transmits captured video data as streaming video data to back-end streaming server 60 via smartphone 80.

  In this case, wearable camera 10 is connected to smartphone 80 using a predetermined communication form (for example, a wireless LAN such as WiFi (registered trademark)). A wireless LAN (that is, WLAN (Wireless Local Area Network)) is capable of high-speed communication with a communication speed of several tens to several hundreds Mbps compared with BLE. When the smartphone 80 receives streaming video data from the wearable camera 10 using a wireless LAN, the smartphone 80 transmits the streaming video data to the back end via the network NW using another communication form (for example, LTE (Long Term Evolution)). Transfer to the streaming server 60.

  When using a wireless LAN, the tethering function of the smartphone 80 is used. In the tethering function, the smartphone 80 operates as a wireless LAN access point. The smartphone 80 transfers the captured video data captured by the wearable camera 10 to the back-end streaming server 60 in real time. Instead of using the smartphone 80, data transfer may be performed similarly using a tablet terminal (not shown) or a mobile router (not shown).

  The smartphone 80 can be used by the police officer 3 in a pocket or the like. The smartphone 80 transmits captured video data from the wearable camera 10 to the back-end streaming server 60, and also captures captured video data captured by the wearable camera 10. It may be displayed so that it can be viewed for preview.

  The smartphone 80 is always connected to the wearable camera 10 and can perform various types of processing on the captured video data captured by the wearable camera 10. For example, as described above, the smartphone 80 reproduces the captured video data or adds metadata (described later) to the captured video data in addition to unnecessary data included in the captured video data by the operation of the police officer 3. Or a tag indicating the type of the incident is added to the captured video data. The metadata is data indicating attached information related to the captured video data. For example, the case number, the case classification (tags, such as “murder”, “robbery”, “arson”, etc.), the police officer 3 himself The comment (for example, a memo related to the incident) input by the operation.

  When the captured video data is transmitted from the wearable camera 10 to the back-end streaming server 60, since the viewer for browsing the captured video data is not provided in the wearable camera 10, the police officer 3 selects only the necessary captured video data. And difficult to send. However, the police officer 3 can use the smartphone 80 to send only the captured video data confirmed and selected by the police officer 3 to the back-end streaming server 60. Therefore, it is not necessary to transmit unnecessary captured video data, and the amount of video data stored in the back-end streaming server 60 can be suppressed.

  The back-end streaming server 60 is connected to a back-end server (BES: Back-End Server) 50 in the in-station system 8, and is taken from the wearable camera 10 and stored in the storage 68 (see FIG. 6A). Data (streaming video data) can be transferred to the back-end server 50. After transferring to the back-end server 50, the back-end streaming server 60 may immediately delete the video data stored in the storage 68, or may hold it for a certain period.

  Further, as described later, the wearable camera 10 is manually placed (set) on the collective charging base 90 by the police officer 3 so that the video data stored in the wearable camera 10 is used in the police station 4, for example. It is also possible to transmit directly to the backend server 50 using a possible wireless LAN.

  The in-vehicle camera system 30 includes an in-vehicle PC (Personal Computer) 32 and an in-vehicle recorder 33, and captures and records images of incidents and the like encountered while traveling in the police car 7. A plurality of in-vehicle cameras 31 are often provided in the police car 7. In this case, the plurality of in-vehicle cameras 31 are installed in the police car 7 so that, for example, the front, left side, right side, and rear of the police car 7 can be imaged. For example, the in-vehicle PC 32 is installed in the police car 7 and controls the operations of the in-vehicle camera 31 and the in-vehicle recorder 33 in accordance with an instruction operated by the police officer 3. The in-vehicle recorder 33 records captured video data captured by at least one in-vehicle camera 31 in time series.

  The in-vehicle camera system 30 is wirelessly connected to, for example, the back-end server 50, and selects specific captured image data from the captured image data recorded in the in-vehicle recorder 33 by the operation of the police officer 3. May be sent. In addition, when the police officer 3 wearing the wearable camera 10 in a uniform is on the police car 7, the in-vehicle PC 32 can communicate with the wearable camera 10 via a USB (Universal Serial Bus), and the wearable camera 10 takes an image. The captured image data is recorded in the in-vehicle recorder 33. The in-vehicle recorder 33 can also directly record captured video data from the wearable camera 10 using BLE or wireless LAN.

  The station system 8 includes a back-end server 50, a back-end streaming server 60, a back-end client (BEC: Back-End Client) 75, and a back-end administrator (BEA: Back) installed in the police station 4. -End Administrator) 70, a wireless LAN access point 63P, and a collective charging stand 90.

  The back end streaming server 60 is communicably connected to the smartphone 80 via the network NW. Therefore, the back-end streaming server 60 is communicably connected to the wearable camera 10 via the network NW and the smartphone 80. The back-end streaming server 60 receives captured video data that is streamed in real time from the wearable camera 10, accumulates it in the storage 68, and transfers it to the back-end server 50.

  The back-end server 50 is connected to the back-end streaming server 60 in a wired or wireless manner, receives streaming video data stored in the storage 68 of the back-end streaming server 60, and stores it in the storage 58 (see FIG. 6B). The back-end server 50 is a server that manages, for example, evidence video of an incident managed by the police station 4, and is connected to an external network NW such as the Internet from the viewpoint of security (for example, prevention of data exploitation due to unauthorized access). It is excluded and used only in a network (for example, an intranet) closed in the police station 4.

  The wireless LAN access point 63P is connected to the wearable camera 10 via a wireless LAN, receives the captured video data transmitted from the wearable camera 10, and transfers it to the back-end server 50. Wearable camera 10 can also transfer captured video data to back-end server 50 using a wired LAN in police station 4. Wearable camera 10 also sends captured video data to backend client 75 connected to wearable camera 10 via a USB cable in police station 4, and transfers it from backend client 75 to backend server 50. Is also possible. In the police station 4, the wearable camera 10 may send the captured video data to the back-end client 75 by communication (for example, communication by wired LAN or wireless LAN that can be provided in the police station 4).

  The back-end server 50 also includes a face recognition function for recognizing a person's face in an image frame constituting the captured video data captured by the wearable camera 10, for example, and a person included in audio data transmitted from the wearable camera 10 Has a voice recognition function for recognizing

  The back-end client 75 is a PC that is installed in the monitoring room RV in the police station 4 and operated by a specific police officer, for example. The back-end client 75 accesses a suspicious person database (not shown) of the back-end server 50, searches for information on an incident such as a criminal, and displays the search result on a display device (for example, an LCD provided in the back-end client 75 in advance) (Liquid Crystal Display)) A browser or a dedicated application that can be displayed on the screen. The suspicious person database is registered in advance in association with information (for example, case number) for identifying a case by, for example, a person being nominated or a past criminal. Further, the back-end client 75 can access a crime database (not shown) of the back-end server 50 and search for information related to an incident such as a criminal.

  The back-end administrator 70 can diagnose the performance of the wearable camera 10 via the network NW via the back-end server 50 and the back-end streaming server 60. Note that the back-end administrator 70 may be installed not only inside the police station 4 but also outside the police station 4. Further, the back-end administrator 70 may be either a thin client PC or a rich client PC. Further, the back-end administrator 70 can diagnose the performance of the wearable camera 10 by connecting to the wearable camera 10 via the network NW without going through the back-end streaming server 60. Further, the performance diagnosis of the wearable camera 10 may be performed by the back-end client 75 by access from the back-end client 75 instead of access from the back-end administrator 70.

  The back-end client 75 is a PC operated by a police officer in the police station 4. The back end client 75 searches and reproduces video data. Further, the back-end client 75 displays the video so as to be viewable and creates a storage medium to be submitted to the court. Further, the back-end client 75 performs image shake correction and performs processing for improving image quality.

  The collective charging stand 90 can place the wearable cameras 10 worn or possessed by a plurality of police officers 3 and charges the individual wearable cameras 10 placed thereon. When the wearable camera 10 is placed, the collective charging stand 90 is connected to the wearable camera 10 by a wired connection, and the captured video data stored in the wearable camera 10 is connected to a wireless LAN that can be used in the police station 4. And has a function of transmitting to the back-end server 50.

  In the wearable camera system 5 having such a configuration, the wearable camera 10 is connected to the in-vehicle camera system 30 so as to be able to transfer data using a short-range wireless communication or a signal cable such as USB. Video data captured by the wearable camera 10 is transferred to the in-vehicle camera system 30, reproduced or recorded by the in-vehicle camera system 30, and transmitted to the back-end server 50.

  The in-vehicle camera system 30 can record the video data captured by the in-vehicle camera 31 and the video data captured by the wearable camera 10 in the in-vehicle recorder 33 and transmit the data to the back-end streaming server 60 via the wireless LAN.

  The wearable camera 10 can transmit the captured image data to the back-end streaming server 60 in the in-station system 8 via the smartphone 80 and the network NW. The wearable camera 10 can directly transmit the captured video data obtained by the imaging to the back-end server 50 via the wireless LAN using the wireless LAN access point 63P. Furthermore, the wearable camera 10 can be transmitted directly to the back-end server 50 via a wired LAN, and can be transmitted to the back-end server 50 via a back-end client 75 connected via USB.

  The police officer 3 returns to the police station 4 and attaches (places) the wearable camera 10 to the collective charging stand 90, so that the collective charging stand 90 charges the wearable camera 10. In addition, the collective charging stand 90 reads out the captured video data recorded in the wearable camera 10 when the wearable camera 10 is placed on the charging port of the collective charging stand 90, and the collective charging stand 90 is connected to the collective charging stand 90 via the USB cable. The data can be transmitted to the back-end server 50 via the connected back-end client 75.

  FIG. 2 is a diagram illustrating an example of the upper body of the police officer 3 wearing the wearable camera 10 of each embodiment. Wearable camera 10 is placed in front of the uniform of police officer 3 so that the front of police officer 3 can be imaged. For example, the wearable camera 10 may be fixed to the front part of the uniform in a state where it is suspended from the neck with a string, or an attachment (for example, attachment) attached to the back surface of the housing 10z (see FIG. 3) of the wearable camera 10 For example, the clip may be fixed to the front part of the uniform by engaging the attachment tool attached to the front part of the uniform.

  FIG. 3 is a front view illustrating an example of a front side surface of the housing 10z of the wearable camera 10 according to each embodiment. A recording switch SW1, a snapshot switch SW2, and an imaging lens 11z are arranged on the front surface of the housing 10z. The recording switch SW1 is instructed to start recording by being pressed for a short time, and instructed to stop recording by being pressed for a long time (for example, an operation in which the pressing state is continued for 3 seconds). Each time the snapshot switch SW2 is pressed, the snapshot switch SW2 instructs to record a still image captured by the imaging unit 11 in the storage unit 15 (see FIG. 4). The imaging lens 11z forms an image of the reflected light of the subject incident on the imaging lens 11z on the imaging surface of the imaging unit 11 (see FIG. 4).

  A communication mode switch SW3 and an attribute information giving switch SW4 are arranged on the side surface of the housing 10z. The communication mode switch SW3 is a switch for setting a communication mode, as will be described later. The attribute information addition switch SW4 is a switch to which metadata can be added by the wearable camera 10, as will be described later.

  Three LEDs 26a, 26b, and 26c are arranged on the upper surface of the housing 10z. The LED 26a displays the power on / off state of the wearable camera 10 and the state of the battery 25 (see FIG. 4). The LED 26b displays the state of the imaging operation of the wearable camera 10. The LED 26c displays the state of the communication mode of the wearable camera 10.

  FIG. 4 is a block diagram illustrating an example of a hardware configuration of the wearable camera 10 according to each embodiment. The wearable camera 10 includes an imaging unit 11, a GPIO 12 (General Purpose Input / Output), a RAM (Random Access Memory) 13, a ROM (Read Only Memory) 14, and a storage unit 15. The wearable camera 10 includes an EEPROM (Electrically Erasable Programmable ROM) 16, an RTC (Real Time Clock) 17, and a GPS (Global Positioning System) receiver 18. The wearable camera 10 includes an MCU (Micro Controller Unit) 19, a BLE communication unit 21A, a WLAN communication unit 21B, a USB (Universal Serial Bus) interface (I / F) 22, a contact terminal 23, and a power supply unit 24. The battery 25 is provided.

  The wearable camera 10 includes a recording switch SW1, a snapshot switch SW2, a communication mode switch SW3, and an attribute information addition switch SW4.

  The wearable camera 10 includes three LEDs (Light Emitting Diodes) 26a, 26b, and 26c, and a vibrator 27.

  The imaging unit 11 includes an imaging lens 11z (see FIG. 3) and a solid-state imaging device such as a CCD (Charge Coupled Device) type image sensor or a CMOS (Complementary Metal Oxide Semiconductor) type image sensor. The imaging unit 11 outputs the subject image data obtained by imaging to the MCU 19.

  The GPIO 12 is a parallel interface. The GPIO 12 includes a recording switch SW1, a snapshot switch SW2, a communication mode switch SW3, an attribute information assignment switch SW4, LEDs 26a, 26b, and 26c, a vibrator 27, an LCD 28, an earphone terminal 29C as an audio output terminal, a speaker 29B, and a microphone 29A. Connected.

  Detection terminal CON. As will be described later, DET is a terminal at which a voltage change occurs when wearable camera 10 is placed (set) on collective charging stand 90 or removed from collective charging stand 90. Detection terminal CON. DET is connected to the AD converter CV. Detection terminal CON. A signal indicating a voltage change of DET is converted into a digital signal by the AD converter CV, and the digital signal is input to the MCU 19 via the I2C 20.

  The gyro sensor GY, the acceleration sensor AC, and the AD converter CV are connected to the MCU 19 via a communication interface (for example, I2C20) provided in the MCU 19. Note that the 23 detection terminals CON. A similar effect can be obtained by connecting DET to GPIO 12 without using AD converter CV.

  The GPIO 12 inputs and outputs signals between these various electronic components and the MCU 19. For example, the microphone 29 </ b> A collects sound around the wearable camera 10, and outputs sound data of the collected sound to the MCU 19 via the GPIO 12. Note that the microphone 29 </ b> A may be a built-in microphone housed in the housing 10 z of the wearable camera 10 or a wireless microphone wirelessly connected to the wearable camera 10. In the case of a wireless microphone, the sound pickup property can be improved by attaching the police officer 3 to an arbitrary location.

  The RAM 13 is a work memory used in the operation of the MCU 19, for example. The ROM 14 stores in advance a program and data for controlling the MCU 19, for example.

  The storage unit 15 is configured by a storage medium such as a memory card, for example, and records the captured video data captured by the imaging unit 11 based on an instruction to start automatic recording (that is, a recording start instruction). In addition, the storage unit 15 includes a setting data file 15z in which resolution up information and the like are set. For example, when the storage unit 15 is configured by a memory card, the storage unit 15 is detachably attached to the housing 10z of the wearable camera 10.

  The EEPROM 16 stores, for example, identification information for identifying the wearable camera 10 (for example, a serial number as a Camera ID) and various setting information. The RTC 17 counts the current time information and outputs it to the MCU 19.

  The GPS receiver 18 receives satellite signals including their own signal transmission times and position coordinates transmitted from a plurality of GPS transmitters (for example, four navigation satellites) and outputs them to the MCU 19. The MCU 19 uses the plurality of satellite signals to calculate the current position coordinates of the wearable camera 10 and the reception time of the satellite signals. This calculation may be executed not by the MCU 19 but by the GPS receiver 18. This reception time information may also be used for correcting the system time of wearable camera 10. The system time is used for recording the imaging time of captured images (including still images and moving images).

  The MCU 19 has a function as a control unit of the wearable camera 10, for example, control processing for overall control of operations of each unit of the wearable camera 10, data input / output processing with each unit of the wearable camera 10, Data calculation (calculation) processing and data storage processing are performed. The MCU 19 operates according to programs and data stored in the ROM 14. During operation, the MCU 19 uses the RAM 13 and obtains current time information from the RTC 17.

  The MCU 19 includes a detection unit 19z that can be realized by executing an application program, and generates audio data obtained by cutting out an audio section from the audio data collected by the microphone 29A using the detection unit 19z.

  The BLE communication unit 21A communicates with the smartphone 80 and the like using a communication mode of BLE (Bluetooth Low Energy) which is a communication standard for short-range wireless communication. BLE is the name of Bluetooth (registered trademark) version 4.0. In BLE, communication is possible with low power consumption, but the communication speed is as low as about 100 kbps.

  When the smartphone 80 operates as an access point using the tethering function, the WLAN communication unit 21B and the wireless LAN access point 63P of the wireless LAN that can be used in the police station 4 and the wireless LAN (that is, WLAN) Connected by wireless communication with the connection destination. Compared with BLE, a wireless LAN can communicate at a high speed of several tens to several hundreds of Mbps, but power consumption increases because it is always connected to a wireless LAN access point.

  The USB interface 22 is a serial bus, and can be connected to, for example, the in-vehicle camera system 30 and the back-end client 75 in the police station 4.

  The contact terminal 23 is a terminal for electrical connection with the collective charging stand 90 and the like, is connected to the MCU 19 via the USB interface 22, and is connected to the power supply unit 24. The contact terminal 23 can charge the battery 25 and communicate image data and the like via the power supply unit 24.

  The contact terminal 23 is provided with, for example, “charging terminal V +”, “detection terminal CON.DET”, “data terminals D−, D +” and “ground terminal GND” (see FIG. 13). Detection terminal CON. The DET is a terminal for detecting a voltage and a voltage change. When the wearable camera 10 is placed (set) on the collective charging base 90, the DET detects a voltage change from the collective charging base 90. The detected voltage change is input to the GPIO 12. The data terminals D− and D + are terminals for transferring an image captured by the wearable camera 10 to an external PC or the like via, for example, a USB connector terminal. The wearable camera 10 has a detection terminal CON. A voltage applied to the DET is converted into a digital signal by the AD converter CV, and data transfer is started through the data terminals D− and D + using a voltage change detected by reading a numerical value based on the digital signal by the I2C 20 as a trigger.

  By connecting the contact terminal 23 and the collective charging stand 90, data communication is possible between the wearable camera 10 and the external device.

  The power supply unit 24 supplies the battery 25 with power supplied from the collective charging stand 90 via, for example, the contact terminal 23 to charge the battery 25. The battery 25 is constituted by a rechargeable secondary battery, for example, and supplies power to each part of the wearable camera 10.

  The recording switch SW1 is a push button switch for inputting an operation instruction for starting / stopping recording (moving image capturing) by a pressing operation of the police officer 3, for example. For example, when the recording switch SW1 is pressed an odd number of times, recording (moving image capturing) starts, and when the recording switch SW1 is pressed an even number of times, the recording ends. When pressed twice in succession, the recording switch SW1 functions as an emergency button, as will be described later.

  The snapshot switch SW2 is a push button switch for inputting an operation instruction for capturing a still image by a pressing operation of the police officer 3, for example. For example, each time the snapshot switch SW2 is pressed, a still image is captured when the snapshot switch SW2 is pressed.

  The communication mode switch SW3 is a slide switch that inputs an operation instruction for setting a communication mode between the wearable camera 10 and an external device, for example. The communication mode includes, for example, an access point mode, a station mode, and an OFF mode.

  In the access point mode, the wearable camera 10 operates as a wireless LAN access point. For example, the wearable camera 10 and the smartphone 80 communicate with each other by wirelessly connecting to the smartphone 80 worn or held (held) by the police officer 3. Mode. In the access point mode, when the smartphone 80 and the wearable camera 10 are wirelessly connected, the smartphone 80 displays the current live image by the wearable camera 10, playback of the recorded image, display of the captured still image, and the like. It can be carried out.

  The station mode is a mode for communicating with an external device as an access point when connecting to the external device using a wireless LAN. For example, the smartphone 80 may be set as an external device using the tethering function of the smartphone 80. In the station mode, the wearable camera 10 sends various settings, transfers (uploads) of recorded images held by the wearable camera 10, to the back-end client 75 and back-end server 50 in the in-vehicle camera system 30 and the police station 4. Can be done against. In the present embodiment, when the wearable camera 10 transmits video data to the back-end streaming server 60, the communication mode switch SW3 is set to the station mode.

  The OFF mode is a mode in which the wireless LAN communication operation is turned off and the wireless LAN is not used.

  The attribute information addition switch SW4 is a push button switch operated to give attribute information (metadata) to video data.

  The LED 26 a is a display unit that indicates a power-on state (on / off state) of the wearable camera 10 and a state of the battery 25, for example. LED26b is a display part which shows the state (recording state) of the imaging operation of the wearable camera 10, for example. LED26c is a display part which shows the state of the communication mode of the wearable camera 10, for example. Further, when the wearable camera 10 receives notification data from the back-end server 50, the three LEDs 26a to 26c perform a blinking operation in accordance with an instruction from the MCU 19. At this time, the MCU 19 changes the blinking pattern of the LEDs 26 a to 26 c according to the information regarding the sound source included in the notification data.

  The gyro sensor GY detects the angular velocity (that is, the rotation angle per unit time) of the wearable camera 10, and detects, for example, that the police officer 3 wearing or carrying the wearable camera 10 has fallen (Man Down). The detection result of the gyro sensor GY is input to the MCU 19 via the I2C20. The wearable camera 10 uses the gyro sensor GY to perform behavior related to the rotation of the police officer 3 wearing or carrying the wearable camera 10 (for example, falling to the ground, being shot with a handgun and falling to the ground, weapons Can be detected with high accuracy).

  The acceleration sensor AC detects accelerations in the three-axis directions (so-called x-axis, y-axis, and z-axis) of the orthogonal coordinate system of the wearable camera 10, and for example, the police officer 3 wearing or carrying the wearable camera 10 falls It detects that it has started (Man Down), has started running, and that the police officer 3 is in a shooting position by holding a handgun. The detection result of the acceleration sensor AC is input to the MCU 19 via the I2C20. The wearable camera 10 can accurately detect a behavior related to the movement or posture of the police officer 3 wearing or holding the wearable camera 10 by using the acceleration sensor AC.

  The MCU 19 detects input of each of the recording switch SW1, the snapshot switch SW2, the communication mode switch SW3, and the attribute information addition switch SW4, and performs processing for the switch input that has been operated.

  When the MCU 19 detects an operation input of the recording switch SW1, the MCU 19 controls the start or stop of the imaging operation in the imaging unit 11, and stores the image obtained from the imaging unit 11 in the storage unit 15 as a moving image.

  When the MCU 19 detects an operation input of the snapshot switch SW2, the MCU 19 stores an image by the imaging unit 11 when the snapshot switch SW2 is operated in the storage unit 15 as a still image.

  The MCU 19 detects the state of the communication mode switch SW3 and operates the BLE communication unit 21A or the WLAN communication unit 21B according to the communication mode according to the setting of the communication mode switch SW3.

  When the attribute information addition switch SW4 is pressed, the MCU 19 adds a tag indicating the type of the case as attribute information to the captured video data captured by the imaging unit 11.

  FIG. 5 is a block diagram illustrating an example of a hardware configuration of the smartphone 80 according to each embodiment. The smartphone 80 includes a CPU 81, a memory 82, a display 83, a BLE communication unit 84, a WLAN communication unit 85, and a mobile communication unit 86. The CPU 81 comprehensively controls the operation of each unit of the smartphone 80. The memory 82 stores a control program executed by the CPU 81 and various data.

  The display 83 is configured using a touch panel that can accept an operation of a police officer, displays a screen representing the operation status of the smartphone 80, and displays captured video data captured by the wearable camera 10.

  The BLE communication unit 84 communicates with the wearable camera 10 and the like using a communication mode of BLE (Bluetooth Low Energy) which is a communication standard for short-range wireless communication. When the smartphone 80 operates as a wireless LAN access point using the tethering function, the WLAN communication unit 85 connects to the wearable camera 10 using a wireless LAN communication mode, and performs high-speed communication with the wearable camera 10. The wireless LAN is capable of high-speed communication with a communication speed of several tens to several hundreds Mbps compared with BLE.

  The mobile communication unit 86 can communicate with other mobile terminals via a mobile phone network, and data communication is performed between the smartphone 80 and the back-end streaming server 60 connected to a network NW such as the Internet. Relay. As a communication standard for mobile communication, LTE (Long Term Evolution), 4G (4th Generation), or the like is used.

  FIG. 6A is a block diagram illustrating an example of a hardware configuration of the back-end streaming server 60. The back-end streaming server 60 receives and accumulates captured video data transmitted from the wearable camera 10 and transfers it to the back-end server 50. The back-end streaming server 60 includes a CPU 61, an I / O control unit 62, a communication unit 63, a memory 64, a storage control unit 67, and a storage 68. Since the back-end streaming server 60 is a PC that transfers data in response to a request from the back-end server 50, it is not essential to include an input unit such as a mouse or a display unit such as a display. May be.

  The CPU 61 performs control processing for overall control of operations of each unit of the back-end streaming server 60, data input / output processing with other units, and data storage processing. The CPU 61 operates according to programs and data stored in the memory 64.

  The memory 64 is configured by using, for example, RAM, ROM, nonvolatile or volatile semiconductor memory, functions as a work memory when the CPU 61 operates, and stores a predetermined program and data for operating the CPU 61. .

  A back-end server 50, a storage control unit 67, and a communication unit 63 are connected to the I / O control unit 62. The back-end streaming server 60 performs data transfer to the back-end server 50 via the I / O control unit 62.

  The communication unit 63 is connected to the wearable camera 10 via the network NW and the smartphone 80, and receives video data transmitted from the wearable camera 10. The communication unit 63 exchanges information or data with the back-end server 50.

  The storage control unit 67 controls the operation of the storage 68. The storage 68 is a storage device such as an SSD or HDD that is controlled by the storage control unit 67, and stores video data transmitted from the wearable camera 10 via the I / O control unit 62 in accordance with instructions from the CPU 61.

  FIG. 6B is a block diagram illustrating an example of a hardware configuration of the back-end server 50. The back-end server 50 includes a CPU 51, an I / O control unit 52, a communication unit 53, a memory 54, an input unit 55, a display unit 56, a speaker 59, a storage control unit 57, and a storage 58. Prepare.

  The CPU 51 performs, for example, control processing for overall control of operations of each unit of the back-end server 50, data input / output processing with other units, data calculation (calculation) processing, and data storage processing. . The CPU 51 operates according to programs and data stored in the memory 54.

  The I / O control unit 52 controls the input / output of data between the CPU 51 and each unit of the back-end server 50 (for example, the communication unit 53, the input unit 55, the display unit 56, and the storage control unit 57). And the data to the CPU 51 are relayed. Note that the I / O control unit 52 may be configured integrally with the CPU 51.

  The communication unit 53 is, for example, wired or wireless between the in-vehicle recorder 33, the in-vehicle PC 32, or the smartphone 80, the wearable camera 10 that the police officer 3 can wear or hold, or the back-end client 75. Communication by. Further, the communication unit 53 exchanges information or data with the back-end streaming server 60, with the back-end client 75, and with the back-end administrator 70, respectively.

  The memory 54 is configured using, for example, RAM, ROM, nonvolatile or volatile semiconductor memory, functions as a work memory when the CPU 51 operates, and stores a predetermined program and data for operating the CPU 51. .

  The input unit 55 is a UI (User Interface) for receiving an input operation of a person in charge in the police officer 3 or the police station 4 and notifying the CPU 51 via the I / O control unit 52. For example, a mouse, a keyboard, or the like It is a pointing device. The input unit 55 may be configured using, for example, a touch panel or a touch pad that is arranged in correspondence with the screen of the display unit 56 and can be operated with a finger or a stylus pen of the police officer 3 or the person in charge. The back-end server 50 can also be operated from a back-end administrator 70 or a back-end client 75 connected via a network within the police station 4.

  The display part 56 is comprised, for example using LCD or organic EL, and displays various information. For example, when an image captured or recorded by the wearable camera 10 is input in response to an input operation of the police officer 3 or a person in charge, the display unit 56 displays this image on the screen under the instruction of the CPU 51. To do. For example, when an image captured or recorded by the in-vehicle camera 31 is input in response to an input operation of the police officer 3 or a person in charge, the display unit 56 displays this image on the screen under the instruction of the CPU 51. To do. Further, when operated from the back-end administrator 70 or the back-end client 75 connected via the network in the police station 4, various information is displayed on the back-end administrator 70 or the back-end client 75.

  The speaker 59 outputs the sound under the instruction of the CPU 51 when the sound collected by the wearable camera 10 is input in response to the input operation of the police officer 3 or the person in charge, for example. When operated from the back-end administrator 70 or the back-end client 75 connected via the network within the police station 4, the sound is output to a speaker connected to the back-end administrator 70 or the back-end client 75.

  When the CPU 51 requests the back-end streaming server 60 to transmit the accumulated captured video data, the storage control unit 57 controls operations such as storing the received video data in the storage 58 in response to the request. To do. The storage 58 is a storage device such as an SSD or HDD that is controlled by the storage control unit 57, and stores captured video data transmitted from the wearable camera 10 via the I / O control unit 52 in accordance with instructions from the CPU 51. To do.

  FIG. 6C is a block diagram illustrating an example of a hardware configuration of the back-end client 75. The back end client 75 includes a CPU 151, an I / O control unit 152, a communication unit 153, a memory 154, an input unit 155, a display unit 156, and a speaker 159.

  The CPU 151 performs, for example, control processing for overall control of operations of each unit of the back-end client 75, data input / output processing with other units, data calculation (calculation) processing, and data storage processing. . The CPU 151 operates in accordance with programs and data stored in the memory 154.

  The I / O control unit 152 controls data input / output between the CPU 151 and each unit (for example, the communication unit 153, the input unit 155, and the display unit 156) of the back-end client 75, and sends data from the CPU 151 to the CPU 151. Relay data. Note that the I / O control unit 152 may be configured integrally with the CPU 151.

  The communication unit 153 performs wired communication with the wearable camera 10 connected to the wired LAN in the police station 4. The communication unit 153 is wired between the in-vehicle recorder 33, the in-vehicle PC 32, or the smartphone 80, between the wearable camera 10 that can be worn or held by the police officer 3, or between the back-end server 50 and the like. Alternatively, wireless communication may be performed. Further, the communication unit 153 exchanges information or data with the back-end server 50.

  The memory 154 is configured using, for example, RAM, ROM, nonvolatile or volatile semiconductor memory, functions as a work memory when the CPU 151 operates, and stores a predetermined program and data for operating the CPU 151. .

  The input unit 155 is a UI (User Interface) for receiving an input operation of a person in charge in the police officer 3 or the police station 4 and notifying the CPU 151 via the I / O control unit 152. For example, a mouse, a keyboard, or the like It is a pointing device. The input unit 155 may be configured using, for example, a touch panel or a touch pad that is arranged corresponding to the screen of the display unit 156 and can be operated with the fingers of the police officer 3 or the person in charge or a stylus pen.

  The display unit 156 is configured using, for example, an LCD or an organic EL, and displays various types of information. For example, when an image captured or recorded by the wearable camera 10 is input in response to an input operation of the police officer 3 or a person in charge, the display unit 156 displays the image on the screen under the instruction of the CPU 151. To do. The display unit 156 displays the video on the screen under the instruction of the CPU 151 when a video imaged or recorded by the in-vehicle camera 31 is input in response to an input operation of the police officer 3 or the person in charge, for example. To do.

  The speaker 159 outputs the sound under the instruction of the CPU 151 when the sound collected by the wearable camera 10 is input according to the input operation of the police officer 3 or the person in charge, for example.

  FIG. 7 is a diagram illustrating a configuration example of the streaming video data Da. The streaming video data Da includes video data fd that is captured video data captured by the wearable camera 10 and metadata md provided by the wearable camera 10 or the smartphone 80. The streaming video data Da is data that is streamed from the wearable camera 10 to the back-end streaming server 60 via the smartphone 80 and the network NW. As described above, the metadata md includes information related to the contents of the video data fd, such as an incident number, an incident classification, and a comment input by the operation of the police officer 3 (for example, a memo of the police officer 3). . Here, the streaming video data is exemplified as the streaming data. However, the audio data may be added as the streaming audio data.

  The operation of the wearable camera system 5 having the above configuration will be described.

  FIG. 8 is a sequence diagram illustrating in detail an example of a streaming operation procedure started in response to the streaming start operation of the wearable camera 10 in the first embodiment. Here, the communication mode switch SW3 provided in the housing of the wearable camera 10 corresponds to, for example, a button operation for starting streaming or a button operation for ending streaming. The communication mode switch SW3 may have two buttons as a streaming start button and a streaming end button, but here, for example, depending on whether or not the communication mode switch SW3 is pressed, the streaming start and the streaming end Can be switched. For example, when the communication mode switch SW3 is pressed, the start of streaming is instructed. When the communication mode switch SW3 is not pressed, the end of streaming is instructed.

  Wearable camera 10 waits until police officer 3 operates communication mode switch SW3 (that is, performs a button operation for starting streaming). When the button operation for starting streaming is performed (T1), the wearable camera 10 changes the communication form between the wearable camera 10 and the smartphone 80 to the smartphone 80 using short-range wireless communication (hereinafter, “BLE”). A request to switch from “communication” to wireless LAN (WLAN) is made (T2). Upon receiving this switching request, the smartphone 80 returns an ACK (Acknowledgement) (T3). This ACK indicates that the smartphone 80 has officially received the switching request of the procedure T2. In the range PRE1 including procedures T2 and T3, BLE communication is performed between the wearable camera 10 and the smartphone 80.

  Wearable camera 10 switches communication with smartphone 80 from BLE communication to a wireless LAN (T4). Similarly, the smartphone 80 switches the communication with the wearable camera 10 from the BLE communication to the wireless LAN (T5). The smartphone 80 starts tethering in response to switching to the wireless LAN (T6), and functions as a wireless LAN access point for connecting the wearable camera 10 to the network NW.

  After the start of tethering, wearable camera 10 transmits a wireless LAN connection confirmation request to smartphone 80 (T7). The wireless LAN connection confirmation request is a request for requesting the communication partner to confirm that the connection using the wireless LAN communication mode is established, and so on. Upon receiving this wireless LAN connection confirmation request, the smartphone 80 returns an acknowledgment (ACK) to the wearable camera 10 (T8). This ACK indicates a response indicating that the smartphone 80 has officially received the wireless LAN connection confirmation request in step T7 and has established a connection with the wearable camera 10 using the wireless LAN communication mode.

  Wearable camera 10 transmits a streaming start request to back-end streaming server 60 to smartphone 80 using the wireless LAN (T9). The smartphone 80 transfers this streaming start request to the back-end streaming server 60 using mobile communication (for example, LTE) (T10). Upon receiving this streaming start request, the back-end streaming server 60 returns an ACK to the wearable camera 10 via the smartphone 80 (T11). This ACK indicates that the back-end streaming server 60 has officially received the streaming start request in step T10. The smartphone 80 transfers ACK to the wearable camera 10 using the wireless LAN (T12).

  Thereafter, wearable camera 10 transmits streaming video data to smartphone 80 using a wireless LAN (T13). The smartphone 80 transfers the streaming video data to the back-end streaming server 60 using mobile communication (for example, LTE) (T14).

  When receiving the streaming video data, the back-end streaming server 60 stores the streaming video data in the storage 68 (T15). The back end streaming server 60 transfers the streaming video data to the back end server 50 in response to a request from the back end server 50 or automatically.

  The timing at which the back-end streaming server 60 automatically transfers the streaming video data may be triggered when a certain amount of time has elapsed, when the data amount reaches a certain amount, or when streaming video data is received. . Further, when streaming video data is transferred to the back-end server 50, the back-end streaming server 60 may delete the streaming video data stored in the storage 68. As a result, the free space of the storage 68 is secured and it is possible to avoid the capacity being over.

  When the back-end streaming server 60 receives the streaming video data transferred from the smartphone 80, the back-end streaming server 60 returns an ACK to the wearable camera 10 using mobile communication (for example, LTE) (T16). This ACK indicates that the back-end streaming server 60 has officially received the streaming video data in step T14. The smartphone 80 transfers this ACK to the wearable camera 10 using the wireless LAN (T17). On the other hand, the back-end server 50 transfers the streaming video data stored in the storage 58 to the back-end client 75 in response to a request from the back-end client 75 or automatically (T18). As a result, the back-end client 75 can reproduce the streaming video data from the wearable camera 10 and present it in real time to, for example, a user browsing a monitor (not shown) of the back-end client 75. Thereafter, transmission of streaming video data (also referred to as “upload”) in steps T13 to T18 is repeated. The smartphone 80 reproduces captured video data captured by the wearable camera 10 (for example, evidence-captured captured video data at the incident site) by transferring (so-called relaying) the streaming video data (playback). Is possible. Here, although ACK is returned for each streaming data unit, a method of returning ACK after receiving a certain amount of streaming data for speeding up data transmission or transmission confirmation may be performed by another protocol. For example, it is possible to transmit data using RTP (Realtime Transfer Protocol) and to check the transmission state using RTCP (Realtime Transfer Control Protocol).

  In the range PRE2 including procedures T7 to T9, T12, and T17, wireless LAN communication is performed between the wearable camera 10 and the smartphone 80. On the other hand, in a range PRE3 including procedures T10, T11, T14, and T16, mobile communication such as LTE is performed between the smartphone 80 and the back-end streaming server 60.

  Wearable camera 10 stands by until police officer 3 operates communication mode switch SW3 (that is, performs a button operation for ending streaming). When the streaming end button operation is performed (T19), the wearable camera 10 requests the smartphone 80 to switch the communication mode between the wearable camera 10 and the smartphone 80 from wireless LAN (WLAN) to BLE communication. (T20). Upon receiving this switching request, the smartphone 80 returns ACK (T21). This ACK indicates that the smartphone 80 has officially received the switching request in step T20. Note that wireless LAN communication is performed between the wearable camera 10 and the smartphone 80 in the range PRE2 including the procedures T20 and T21.

  Wearable camera 10 switches communication with smartphone 80 from wireless LAN to BLE communication (T22). Similarly, the smartphone 80 switches the communication with the wearable camera 10 from the wireless LAN to the BLE communication (T23). Furthermore, the smartphone 80 ends tethering in response to switching to BLE communication (T24), and enables communication with the wearable camera 10 using BLE.

  After the end of tethering, wearable camera 10 transmits a BLE connection confirmation request to smartphone 80 (T25). Upon receiving this BLE connection confirmation request, the smartphone 80 returns ACK (T26). This ACK indicates that the smartphone 80 has officially received the BLE connection confirmation request in step T25. In the range PRE4 including the procedures T25 and T26, BLE communication is performed between the wearable camera 10 and the smartphone 80.

  As described above, when the wearable camera 10 transmits (uploads) the streaming video data to the back-end streaming server 60 via the smartphone 80 with the intention of the police officer 3 to operate the wearable camera 10, It was difficult to transmit in real time at low speed. However, when uploading streaming video data to the police station 4, the wearable camera 10 of the present embodiment can perform high-speed and real-time transmission by switching the communication mode with the smartphone 80 from BLE communication to wireless LAN. It becomes. On the other hand, in the case of a wireless LAN, since power consumption is large, the wearable camera 10 is connected to the smartphone 80 using BLE communication with low power consumption at normal times (for example, when the wearable camera 10 is not transmitting streaming video data). Communication can be performed and an increase in unnecessary power consumption can be suppressed.

  FIG. 9 is a sequence diagram illustrating in detail an example of a streaming operation procedure started in response to a streaming start operation from the back-end client 75 in the first embodiment. Here, an operation performed on an input unit (not shown) of the back-end client 75 corresponds to an operation for starting streaming or an operation for ending streaming. Note that the back-end client 75 includes dedicated buttons for instructing the start of streaming and the end of streaming instead of the above-described operations for starting and stopping the streaming, and the start and end of streaming are detected by detecting the pressing of these dedicated buttons. You may instruct.

  When the back-end client 75 receives a streaming start operation by the user (T51), the back-end client 75 transmits an instruction to start streaming to the back-end server 50 (T52). When receiving the instruction to start streaming, the back-end server 50 returns this ACK to the back-end client 75 (T53). This ACK indicates that the back-end server 50 has officially received the instruction of the procedure T52. The back end server 50 instructs the back end streaming server 60 to transmit a streaming start request to the smartphone 80. The back-end streaming server 60 transmits a streaming start request to the smartphone 80 using mobile communication via the network NW (T54).

  Upon receiving the streaming start request, the smartphone 80 requests the wearable camera 10 to switch the communication mode between the wearable camera 10 and the smartphone 80 from BLE communication to a wireless LAN (T55). When the wearable camera 10 receives this switching request, it returns ACK (T56). This ACK indicates that the wearable camera 10 has officially received the switching request of procedure T55. In the range PRE5 including procedures T55 and T56, BLE communication is performed between the wearable camera 10 and the smartphone 80.

  The smartphone 80 returns ACK from the wearable camera 10 to the back-end streaming server 60 using mobile communication via the network NW (T57). The back end streaming server 60 outputs ACK from the wearable camera 10 to the back end server 50. The backend server 50 transfers the ACK returned to the backend streaming server 60 to the backend client 75 (T58).

  Wearable camera 10 switches the communication mode with smartphone 80 from BLE communication to wireless LAN in response to the switching request in procedure T55 (T59). Similarly, the smartphone 80 switches the communication mode with the wearable camera 10 from BLE communication to wireless LAN (T60). The smartphone 80 starts tethering in response to switching to the wireless LAN (T61) and functions as a wireless LAN access point for connecting the wearable camera 10 to the network NW.

  After starting the tethering, the smartphone 80 transmits a wireless LAN connection confirmation request to the wearable camera 10 (T62). When the wearable camera 10 receives this wireless LAN connection confirmation request, it returns an ACK to the smartphone 80 (T63). This ACK indicates a response that the wearable camera 10 has officially received the wireless LAN connection confirmation request in step T62 and has established a connection with the smartphone 80 using the wireless LAN communication mode. Upon receiving this ACK, the smartphone 80 transfers the ACK to the back-end server 50 using mobile communication via the network NW (T64).

  Wearable camera 10 transmits a streaming start request to back-end streaming server 60 to smartphone 80 using the wireless LAN (T65). The smartphone 80 transfers this streaming start request to the back-end streaming server 60 using mobile communication (for example, LTE) (T66). Upon receiving this streaming start request, the back-end streaming server 60 returns ACK to the smartphone 80 (T67). This ACK indicates that the back-end streaming server 60 has officially received the streaming start request in step T65. The smartphone 80 relays this ACK and transfers it to the wearable camera 10 using the wireless LAN (T68).

  Thereafter, wearable camera 10 transmits streaming video data to smartphone 80 using a wireless LAN (T69). The smartphone 80 transfers the streaming video data to the back-end streaming server 60 using mobile communication (for example, LTE) (T70).

  When receiving the streaming video data, the back-end streaming server 60 stores the streaming video data in the storage 68 (T71). The back-end streaming server 60 transfers this streaming video data to the back-end server 50 in response to a request from the back-end server 50 or automatically.

  The timing for automatically transferring the streaming video data may be triggered when a certain amount of time has elapsed, when the data amount reaches a certain amount, or when streaming video data is received. Further, when streaming video data is transferred to the back-end server 50, the back-end streaming server 60 may delete the streaming video data stored in the storage 68. As a result, the free space of the storage 68 is secured and it is possible to avoid the capacity being over.

  When the back-end streaming server 60 receives the streaming video data transferred from the smartphone 80, the back-end streaming server 60 returns an ACK to the wearable camera 10 using mobile communication (for example, LTE) (T72). This ACK indicates that the back-end streaming server 60 has officially received the streaming video data in step T70. The smartphone 80 transfers this ACK to the wearable camera 10 using the wireless LAN (T73). On the other hand, the back-end server 50 transfers the streaming video data stored in the storage 58 to the back-end client 75 in response to a request from the back-end client 75 or automatically (T74). As a result, the back-end client 75 can reproduce the streaming video data from the wearable camera 10 and present it in real time to, for example, a user browsing a monitor (not shown) of the back-end client 75. Thereafter, transmission (uploading) of streaming video data in steps T69 to T74 is repeated. The smartphone 80 can reproduce (playback) the captured video data captured by the wearable camera 10 (e.g., evidenced video data at the scene of the incident) by transferring (relaying) the streaming video data. is there.

  When the back end client 75 receives a streaming end operation by the user (T75), the back end client 75 transmits a streaming end instruction to the back end server 50 (T76). When receiving the instruction to end the streaming, the back-end server 50 returns this ACK to the back-end client 75 (T77). This ACK indicates that the back-end server 50 has officially received the instruction of the procedure T76. The back-end server 50 instructs the back-end streaming server 60 to transmit a streaming end request to the smartphone 80. The back-end streaming server 60 transmits a streaming end request to the smartphone 80 using mobile communication via the network NW (T78).

  Upon receiving the streaming end request, the smartphone 80 returns this ACK to the back-end server 50 (T79). This ACK indicates that the smartphone 80 has officially received the streaming end request in step T78. Furthermore, the smartphone 80 requests the wearable camera 10 to switch the communication mode between the wearable camera 10 and the smartphone 80 from wireless LAN to BLE communication (T80). When the wearable camera 10 receives this switching request, it returns ACK (T81). This ACK indicates that the wearable camera 10 has officially received the switching request of procedure T80.

  In the range PRE7 including procedures T62, T63, T65, T68, T69, T73, T80, and T81, communication using the wireless LAN is performed between the wearable camera 10 and the smartphone 80. In the range PRE6 including procedures T54, T55, T64, T66, T67, T70, T72, T78, and T79, mobile communication (for example, LTE) is performed between the smartphone 80 and the back-end streaming server 60.

  Wearable camera 10 switches the communication mode with smartphone 80 from wireless LAN to BLE communication in response to the switching request in procedure T80 (T82). Similarly, the smartphone 80 switches the communication mode with the wearable camera 10 from wireless LAN to BLE communication (T83). The smartphone 80 ends tethering in response to switching to BLE communication (T84), and communicates with the wearable camera 10 using BLE.

  After the end of tethering, wearable camera 10 transmits a BLE connection confirmation request to smartphone 80 (T85). The BLE connection confirmation request is a request for requesting the communication partner to confirm that the connection using the communication mode of BLE has been made, and so on. Upon receiving this BLE connection confirmation request, the smartphone 80 returns ACK to the wearable camera 10 (T86). This ACK indicates a response that the smartphone 80 has officially received the BLE connection confirmation request in step T85 and has established a connection with the wearable camera 10 using the BLE communication mode. In the range PRE8 including procedures T85 and T86, communication is performed between the wearable camera 10 and the smartphone 80 by BLE.

  As described above, when the wearable camera 10 transmits (uploads) streaming video data to the back-end streaming server 60 via the smartphone 80 in accordance with an instruction from the commander of the police station 4 instead of the intention of the police officer 3, BLE communication is performed. So it was difficult to send in real time at low speed. However, the wearable camera 10 according to the present embodiment can perform high-speed real-time transmission by switching from BLE communication to a wireless LAN when uploading streaming video data to the police station 4. On the other hand, in the case of a wireless LAN, since the power consumption is large, the wearable camera 10 uses the BLE communication with low power consumption in the back-end streaming server 60 during normal times (for example, when the wearable camera 10 is not transmitting streaming video data). To reduce power consumption.

  FIG. 10 is a flowchart for explaining in detail an example of an operation procedure of streaming delivery of the wearable camera 10 according to the first embodiment. The MCU 19 of the wearable camera 10 waits until there is a streaming start request (S1). This process corresponds to whether or not the streaming start button is pressed in step T1 in FIG. 8, or whether or not there is a wireless LAN switching request from the smartphone 80 in step T55 in FIG.

  When there is a streaming start request (S1, YES), the MCU 19 makes a request to switch the communication mode with the smartphone 80 from BLE communication by the BLE communication unit 21A to wireless LAN by the WLAN communication unit 21B (S2). The MCU 19 waits until this communication switching is completed (S3). Each process of steps S2 and S3 corresponds to procedure T4 in FIG. 8 or procedure T59 in FIG.

  When the switching of communication is completed (S3, YES), the MCU 19 starts communication with the smartphone 80 using the wireless LAN by the WLAN communication unit 21B (S4). The MCU 19 transmits streaming video data to the smartphone 80 (S5). Steps S4 and S5 correspond to steps T9 and T13 in FIG. 8, or steps T65 and T69 in FIG.

  The MCU 19 determines whether there is a streaming end request (S6). This process corresponds to whether or not the streaming end button is pressed in step T19 in FIG. 8, or whether or not a BLE switching request is issued from the smartphone 80 in step T80 in FIG.

  If there is no streaming end request (S6, NO), the MCU 19 repeats the process of step S6. On the other hand, when there is a streaming end request (S6, YES), the process of the MCU 19 returns to step S1.

  FIG. 11 is a flowchart illustrating in detail an example of an operation procedure for streaming delivery of the smartphone 80 according to the first embodiment. The CPU 81 of the smartphone 80 waits until there is a request for switching from BLE communication to a wireless LAN (S11). This process corresponds to the procedure T2 in FIG. 8 or the procedure T54 in FIG.

  The CPU 81 switches the communication mode with the wearable camera 10 from BLE communication by the BLE communication unit 21A to wireless LAN by the WLAN communication unit 21B (S12). This process corresponds to the procedure T5 in FIG. 8 or the procedure T60 in FIG. The CPU 81 starts tethering in response to switching to the wireless LAN (T13) and functions as a wireless LAN access point for connecting the wearable camera 10 to the network NW. This process corresponds to the procedure T6 in FIG. 8 or the procedure T61 in FIG.

  After starting tethering, the CPU 81 transfers the streaming video data transmitted from the wearable camera 10 using the wireless LAN to the back-end streaming server 60 by mobile communication by the mobile communication unit 86 (S14). This process corresponds to the procedure T14 in FIG. 8 or the procedure T70 in FIG.

  The CPU 81 determines whether or not there is a request for switching from wireless LAN to BLE communication (S15). The request for switching from wireless LAN to BLE communication corresponds to procedure T20 in FIG. 8 or procedure T80 in FIG. If there is no switching request (S15, NO), the processing of the CPU 81 returns to step S14, and the CPU 81 continues to transfer the streaming video data.

  On the other hand, when there is a request for switching from wireless LAN to BLE communication (S15, YES), the CPU 81 switches from wireless LAN communication by the WLAN communication unit 85 to BLE communication by the BLE communication unit 84 (S16). This process corresponds to the procedure T23 in FIG. 8 or the procedure T83 in FIG. Thereafter, the CPU 81 returns to the process of step S11.

  As described above, the wearable camera system 5 of the first embodiment is connected to the wearable camera 10 and the smartphone 80 (communication terminal) that can be worn or held by the police officer 3 so as to be able to communicate with the smartphone 80 via the network NW. And back-end streaming server 60. Wearable camera 10 is connected to smartphone 80 by BLE (first communication mode). When the wearable camera 10 transmits on-site video data obtained by imaging the imaging area to the back-end streaming server 60 via the smartphone 80, the wearable camera 10 switches to a wireless LAN (second communication mode) different from BLE and converts the on-site video data. Send to smartphone 80. The smartphone 80 switches from the BLE communication to the wireless LAN with the wearable camera 10 in conjunction with the switching to the wireless LAN in the wearable camera 10, and back-ends the data of the on-site video transmitted from the wearable camera 10 by the wireless LAN. Transfer to the streaming server 60.

  Thereby, the wearable camera 10 only communicates with the smartphone 80 by BLE instead of the wireless LAN when the streaming video data is not uploaded, and the useless increase in battery consumption of the wearable camera 10 can be suppressed. On the other hand, when the wearable camera 10 uploads streaming video data, the wearable camera 10 switches the communication mode from BLE to wireless LAN, and therefore can transmit field video data to the back-end streaming server 60 in real time using the wireless LAN. The convenience of the police officer 3 can be improved.

  The wearable camera 10 has a communication mode switch SW3 (button) that can be slid by the police officer 3, and switches the BLE communication to the wireless LAN when the communication mode switch SW3 is operated. As a result, when the police officer at the incident site determines that the site video needs to be transmitted, the data of the site video can be immediately transmitted to the back-end streaming server. Accordingly, the situation at the incident site can be promptly communicated to the police officer in the police station 4.

  Wearable camera 10 switches from BLE communication to a wireless LAN in response to a connection request from back-end streaming server 60. As a result, when the police officer at the scene of the incident cannot be operated, or when the police officer in the police station determines that the situation at the scene of the incident is desired, the operation of transmitting the scene image can be performed remotely. Therefore, the convenience of the wearable camera is enhanced.

  In addition, the smartphone 80 transfers the on-site video data to the back-end streaming server 60 by mobile communication (third communication mode) such as LTE, which is different from BLE communication and wireless LAN. Thereby, the wearable camera 10 can be connected to a network NW such as the Internet using the mobile communication by using the smartphone 80 as a wireless LAN access point. Therefore, even when the back-end streaming server 60 connected to the network NW is in a remote place, high-speed data communication is possible between the wearable camera 10 and the back-end streaming server 60.

  Further, when the wearable camera 10 finishes transmitting the on-site video data to the smartphone 80 and the smartphone 80 finishes transferring the on-site video data to the back-end streaming server 60, the wearable camera 10 switches from wireless LAN to BLE communication, The smartphone 80 switches from wireless LAN to BLE communication. Thereby, when the transmission of the on-site video data to the back-end streaming server 60 is completed, the communication between the wearable camera 10 and the smartphone 80 can be automatically switched from the wireless LAN to the BLE communication. Therefore, the battery consumption of the wearable camera 10 can be reduced to the original level.

(Background to the contents of the second embodiment)
For example, when a police officer returns to the police station from a patrol or incident scene, the video data recorded on the wearable camera (BWC) on the back-end server in the police station (for example, an image captured during the patrol, the incident scene) Or video that can be evidence of the surrounding area).

  However, when returning to the police station, police officers often relaxed and inadvertently forgot to transfer video data. Some police officers cannot perform an operation of transferring video data recorded in a wearable camera to a back-end server in the police station, or dislike such a complicated operation. On the other hand, even police officers who cannot or do not like such operations often do not forget because the work of placing the wearable camera on the charging station and charging it is not a complicated task.

  Therefore, in the second embodiment, in view of the above-described special operations in the police station, police officers can use the back-end server to store the video data recorded in the wearable camera without performing any special operation. An example of a wearable camera system and a communication control method that can be transferred will be described.

(Second Embodiment)
In the first embodiment, the streaming video data is transferred from the wearable camera 10 to the back-end streaming server 60 in real time, and the streaming video data is output from the back-end streaming server 60 to the back-end server 50. In the second embodiment, for example, when the police officer 3 returns to the police station 4 and places (sets) the wearable camera 10 used for patrol or the like on the collective charging stand, the information is recorded on the wearable camera 10. A case where captured image data is automatically transferred to the back-end server 50 is shown.

  The wearable camera system of the second embodiment has almost the same configuration as that of the first embodiment. About the same component as 1st Embodiment, the description is abbreviate | omitted by using the same code | symbol.

  FIG. 12 is a perspective view illustrating an external appearance example of the collective charging stand 90 on which the wearable camera 10 according to the second embodiment is placed (set). The collective charging stand 90 charges the power supply of each mounted wearable camera 10, performs wired communication with the wearable camera 10, and captures captured video data and audio data stored in the wearable camera 10 as a back-end server. 50. The collective charging stand 90 is connected to the back-end server 50 via a back-end client 75 connected to the collective charging stand 90 via a USB (Universal Serial Bus) cable.

  The collective charging base 90 is a place on which many wearable cameras 10 mounted on the uniform of the police officer 3 (or possessed by the police officer 3) are placed, and has a substantially box-shaped housing 90A. A protrusion 91 to which a plurality of wearable cameras 10 can be attached is formed on the upper surface of the housing 90A. When the wearable camera 10 is placed (set) on the collective charging base 90, the protrusion 91 fits into a recess 10y (see FIG. 13) formed on the back surface of the housing 10A of the wearable camera 10.

  FIG. 13 is a perspective view illustrating an example of the back surface of the housing 10A of the wearable camera 10 of each embodiment. On the back surface of the housing 10A of the wearable camera 10, there is formed a recess 10y into which the protrusion 91 of the collective charging base 90 is fitted when the wearable camera 10 is placed (set) on the collective charging base 90. A contact terminal 23 is disposed on the bottom surface of the recess 10y.

  The contact terminal 23 includes a charging terminal “V +”, a detection terminal “CON.DET”, USB interface data terminals “D−” and “D +”, and a ground terminal “GND”. A charging voltage for charging the wearable camera 10 is applied to the charging terminal V +. Detection terminal CON. DET is a terminal for detecting a voltage change. When the wearable camera 10 is set on the collective charging stand 90, the detection terminal CON. A voltage change occurs in DET. The data terminals D− and D + are terminals for transmitting video data and the like recorded on the wearable camera 10 to the backend server 50.

  A contact terminal 92 in which the contact terminal 23 of the wearable camera 10 and each terminal are arranged in the same array is provided at the tip of the protrusion 91 provided on the upper surface of the housing 90A of the collective charging base 90. When the concave portion 10y of the wearable camera 10 is fitted to the protrusion 91 of the collective charging base 90, the contact terminal 23 of the wearable camera 10 contacts the contact terminal 92 of the collective charging base 90 between the terminals.

  When the police officer 3 places (sets) the wearable camera 10 on the collective charging stand 90, that is, when the concave portion 10 y of the wearable camera 10 is fitted to the protrusion 91 of the collective charging stand 90, the contact terminal 23 of the wearable camera 10. Contacts the contact terminal 92 of the collective charging stand 90. As a result, the detection terminal CON. A voltage change occurs in DET. Further, by connecting the contact terminal 23 of the wearable camera 10 and the contact terminal 92 of the collective charging stand 90, data communication is possible between the wearable camera 10 and the back-end server 50 through the data terminals D− and D +. It becomes.

  The operation | movement of the wearable camera system 5 in 2nd Embodiment is shown.

  FIG. 14 is a sequence diagram illustrating in detail a first example of a data transfer operation from the wearable camera 10 according to the second embodiment. For example, the police officer 3 returns to the police station 4 from the patrol or incident scene, and places (sets) the wearable camera 10 on the collective charging stand 90. In this case, the detection terminal CON. DET is connected to the detection terminal CON. Contact DET. The MCU 19 of the wearable camera 10 is connected to the detection terminal CON. A change in the DET voltage is detected, and it is determined that the wearable camera 10 is set on the collective charging stand 90 (T101).

  The wearable camera 10 requests the smartphone 80 to interrupt the BLE connection with the wearable camera 10 (T102). Upon receiving this interruption request, the smartphone 80 returns ACK to the wearable camera 10 (T103). This ACK indicates that the smartphone 80 has officially received the interruption request in step T102. In the range PRE11 including the procedures T102 and T103, BLE communication is performed between the wearable camera 10 and the smartphone 80. The smartphone 80 interrupts the connection with the wearable camera 10 using BLE communication by the BLE communication unit 84 (T104).

  Wearable camera 10 switches from BLE communication with smartphone 80 to wireless LAN communication by receiving the ACK returned in step T103 (T105). The wearable camera 10 makes a connection request to the back-end server 50 using, for example, a wireless LAN that can be used in the police station 4 (T106). Upon receiving this connection request, the back-end server 50 returns ACK to the wearable camera 10 (T107). This ACK indicates that the back-end server 50 has officially received the connection request at step T106. As a result, the wearable camera 10 and the back-end server 50 are connected via the wireless LAN.

  The MCU 19 of the wearable camera 10 reads the streaming video data stored in the storage unit 15 and starts a data upload process (T108). The wearable camera 10 uploads the first data file (T109). When receiving the first data file, the back-end server 50 returns ACK to the wearable camera 10 (T110). This ACK indicates that the back-end server 50 has officially received the data file of procedure T109. Similarly, the wearable camera 10 uploads the second data file (T111). When the back-end server 50 receives the second data file, it returns an ACK to the wearable camera 10 (T112). This ACK indicates that the back-end server 50 has officially received the data file of procedure T111.

  The wearable camera 10 ends the data upload process when all the data files have been uploaded (T113). In this data upload process, for example, when the MCU 19 of the wearable camera 10 uploads one data file using the wireless LAN by the WLAN communication unit 21B, the uploaded data file stored in the storage unit 15 is stored. Is deleted. When one data file is deleted, the free space in the storage unit 15 increases. When all the data files have been uploaded and deleted, the MCU 19 determines that the data upload process has ended.

  Wearable camera 10 may add a flag to the last uploaded data file, and may determine the end of uploading of the data file when the data file is uploaded. In this case, it is not necessary to delete the data file. In the range PRE12 including the procedures T106, T107, T109, T110, T111, and T112, the wearable camera 10 and the back-end server 50 communicate with each other by a wireless LAN that can be used in the police station 4, for example.

  After uploading the data file, the wearable camera 10 is charged by the charging voltage supplied through the charging terminal V + of the contact terminal 23 and the ground terminal GND, and waits until the charging is completed (T114).

  When charging is completed and the police officer 3 removes the wearable camera 10 set on the collective charging stand 90, the detection terminal CON. DET is connected to the detection terminal CON. Release from contact with DET. The MCU 19 is connected to the detection terminal CON. A change in the voltage of DET is detected, and it is determined that wearable camera 10 has been removed from collective charging base 90 (T115).

  The wearable camera 10 switches from wireless LAN to BLE communication (T116). Furthermore, the wearable camera 10 requests the smartphone 80 to resume the BLE connection with the BWC (T117). Upon receiving this connection resumption request, the smartphone 80 returns ACK to the wearable camera 10 (T118). This ACK formally received the BLE connection resumption request (that is, a request for returning the interruption of communication between the wearable camera 10 and the smart phone 80 to resumption, the same applies hereinafter) in step T117. Indicate. The smartphone 80 resumes the connection with the wearable camera 10 using the short-range wireless communication by the BLE communication unit 84 (T119).

  After the BLE communication is resumed, the smartphone 80 transmits a BLE connection confirmation request to the wearable camera 10 (T120). When receiving the confirmation request, wearable camera 10 returns ACK to smartphone 80 (T121). This ACK indicates that the wearable camera 10 has officially received the BLE connection resumption request in step T120. Thereby, for example, when the police officer 3 removes the wearable camera 10 placed (set) on the collective charging base 90 and leaves the police station 4 and heads for the site, the BLE communication is performed between the wearable camera 10 and the smartphone 80. Done. In the range PRE13 including the procedures T117, T118, T120, and T121, BLE communication is performed between the wearable camera 10 and the smartphone 80.

  FIG. 15 is a sequence diagram illustrating in detail a second example of the data transfer operation from the wearable camera 10 according to the second embodiment. In the first data transfer, after the wearable camera 10 was placed (set) on the collective charging base 90, a connection request was made from the wearable camera 10 to the back-end server 50 via the wireless LAN. In the second data transfer, a case where a connection request is made from the back-end server 50 to the wearable camera 10 via a wireless LAN is shown. The same steps as those in the first data transfer are denoted by the same reference numerals, and the description thereof is omitted.

  For example, the back-end server 50 periodically acquires device information connected to the wireless LAN access point 63P from the wireless LAN access point 63P. When the wearable camera 10 is newly connected to the wireless LAN access point 63P, the back-end server 50 makes a connection request to the newly connected wearable camera 10 based on this device information (T106A). When the wearable camera 10 receives this connection request, it returns an ACK to the back-end server 50 (T107A). This ACK indicates that the wearable camera 10 has officially received the connection request in step T106A. As a result, the wearable camera 10 and the back-end server 50 are connected via the wireless LAN.

  Wearable camera 10 starts data upload processing to back-end server 50 (T108A). Since the subsequent operation is the same as the first data transfer described with reference to FIG. 14, the description thereof is omitted. In the range PRE14 including the procedures T106A and T107A, communication by the wireless LAN is performed between the wearable camera 10 and the back-end server 50.

  As described above, the wearable camera system 5 of the second embodiment is connected to the wearable camera 10 and the smartphone 80 (communication terminal) that can be worn or held by the police officer 3 so as to communicate with the smartphone 80 via the network NW. And back-end streaming server 60. Wearable camera 10 detects that it is placed on collective charging base 90. Wearable camera 10 starts communication with back-end server 50 using a wireless LAN (predetermined communication form) when it is detected that it is placed on collective charging stand 90.

  As a result, the police officer 3 can transfer the on-site video data recorded in the wearable camera 10 to the back-end server 50 without performing a special operation. Therefore, even if some police officers cannot perform the operation of transferring the video data recorded in the wearable camera to the back-end server in the police station, or dislike such a complicated operation, The video data can be transferred to the back-end server without making such police officers aware. Moreover, the data of the on-site video recorded in the wearable camera 10 remains, and the remaining capacity of the storage unit 15 (memory) of the wearable camera 10 is significantly reduced so that recording is impossible or overwriting is performed. The loss of video data can be prevented.

  Further, the wearable camera 10 transmits field image data obtained by imaging the imaging area to the back-end server 50 via the wireless LAN. Thereby, a police officer or the like in the police station where the back-end server is installed can check the state of the imaging area based on the data of the transmitted on-site video.

  In addition, wearable camera 10 detects that it has been removed from collective charging stand 90. When the wearable camera 10 detects this, the wearable camera 10 stops communication with the back-end server 50 using the wireless LAN. As a result, when the police officer 3 removes the wearable camera 10 from the collective charging stand 90, the wearable camera 10 is immediately ready for use.

  Wearable camera 10 is connected to smartphone 80 by BLE before detecting that it is placed on collective charging stand 90. The wearable camera 10 switches from the BLE communication to the wireless LAN when detecting that the wearable camera 10 is placed on the collective charging stand 90. Thereby, when the wearable camera 10 is placed on the collective charging stand 90, it is not necessary to suppress power consumption, and it is possible to switch from BLE communication with low power consumption to a wireless LAN capable of high-speed communication even when power consumption is large. Therefore, it is possible to transfer the on-site video data recorded on the wearable camera to the back-end server 50 at a high speed using the wireless LAN.

  Wearable camera 10 switches from wireless LAN to BLE communication when it is detected that it has been removed from collective charging stand 90 (in other words, being placed on collective charging stand 90 has been released). Thereby, after being removed from the collective charging stand 90, the wearable camera 10 can communicate with the smartphone 80 using BLE communication with low power consumption. Therefore, the consumption of the battery 25 of the wearable camera 10 can be suppressed.

  While various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  For example, in the above-described embodiment, the case where video data is transmitted as streaming video data has been shown. However, together with or instead of video data, audio data collected by a microphone provided in the wearable camera is cut out, and the cut out audio data is extracted. Data may be transmitted as streaming data.

  Moreover, in the said embodiment, although it was set as the wireless LAN access point using the smart phone used at the time of the emergency contact from a police station or the emergency contact to a police station, if it is restricted to the function of data transfer, it will not be restricted to a smart phone but a tablet. A wireless LAN access point may be used using a terminal or a mobile router. These tablet terminals and mobile routers, like the smartphone 80 described in this specification, are configured to execute wireless communication using the BLE and wireless communication using the BLE with the wearable camera 10. It is possible to obtain the same effect as that of the smartphone 80.

  In the above embodiment, when streaming delivery is performed, the communication mode switch SW3 is slid to change the communication between the wearable camera 10 and the smartphone 80 from BLE communication to wireless LAN (or from wireless LAN to BLE communication). However, the recording switch SW1 may be used instead of the communication mode switch SW3. That is, the recording switch SW1 may be used as a streaming start button. In this case, streaming distribution may be started simultaneously with the start of recording, or streaming distribution may be started separately from the start of recording. The same applies to the end of streaming distribution. Further, the operation of the recording switch SW1 may be distinguished between recording and streaming distribution. Since the recording switch SW1 also functions as a streaming start / end button, the number of buttons arranged on the housing 10z of the wearable camera 10 can be reduced, and the surface of the housing 10z can be effectively used.

  INDUSTRIAL APPLICABILITY The present invention is useful as a wearable camera system and a communication control method capable of suppressing an unnecessary increase in battery consumption of a wearable camera and transmitting captured images in real time.

3 Police Officer 4 Police Station 5 Wearable Camera System 7 Police Car 10 Wearable Camera 31 Car Camera 32 Car PC
33 In-vehicle recorder 50 Back-end server (BES)
60 Backend streaming server (BSS)
70 Backend Administrator (BEA)
75 Backend Client (BEC)
80 Smartphone 90 Collective charging stand NW Network SW3 Communication mode switch

Claims (6)

A wearable camera system including a wearable camera and a communication terminal that can be worn or held by a user, and a server that is communicably connected to the communication terminal,
The wearable camera is
Using the first communication form) to connect to the communication terminal,
When the captured video obtained by capturing the imaging area is transmitted to the server via the communication terminal, the first communication mode is switched to the second communication mode, and the captured video is transmitted to the communication terminal using the second communication mode. To
The communication terminal is
In conjunction with switching to the second communication mode in the wearable camera, the first communication mode is switched to the second communication mode, and the captured video transmitted from the wearable camera using the second communication mode is Forward to the server,
Wearable camera system.   The wearable camera system according to claim 1, wherein the wearable camera has a button operable by the user, and switches the first communication mode to the second communication mode when the button is operated.   The wearable camera system according to claim 1, wherein the wearable camera switches from the first communication mode to the second communication mode in response to a switching request from the server.   The wearable camera system according to any one of claims 1 to 3, wherein the communication terminal transfers the captured image to the server using a third communication mode.   5. When the transfer of the captured video from the communication terminal to the server ends, the wearable camera and the communication terminal switch from the second communication mode to the first communication mode, respectively. The wearable camera system according to the item. A communication control method in a wearable camera system including a wearable camera and a communication terminal that can be worn or held by a user, and a server that is communicably connected to the communication terminal,
The wearable camera is
Connect to the communication terminal using the first communication form,
When the captured video obtained by capturing the imaging area is transmitted to the server via the communication terminal, the first communication mode is switched to the second communication mode, and the captured video is transmitted to the communication terminal using the second communication mode. To
The communication terminal is
In conjunction with switching to the second communication mode in the wearable camera, the first communication mode is switched to the second communication mode, and the captured video transmitted from the wearable camera using the second communication mode is Forward to the server,
Communication control method.

Images