WO2008010406A1 - Video data recording apparatus, video data recording method, video data recording program and recording medium - Google Patents

Abstract

When an object at the periphery of a mobile object is detected by a detecting section (103), a relative distance between the detected object and the mobile object is calculated by a calculating section (104). Then, a relative speed between the detected object and the mobile object is calculated by a speed calculating section (105), and a threshold value is changed corresponding to the relative speed. Whether the relative distance is smaller than the threshold value or not is judged, and when the relative distance is smaller than the threshold value, recording is started by being controlled by a control section (108). Then, recording is performed until a time when the relative distance is larger than the threshold value, and when the relative value is larger than the threshold value, recording is stopped by being controlled by the control section (108).

Description

 Specification

 VIDEO DATA RECORDING DEVICE, VIDEO DATA RECORDING METHOD, VIDEO DATA RECORDING PROGRAM, AND RECORDING MEDIUM

 Technical field

 The present invention relates to a video data recording apparatus, a video data recording method, a video data recording program, and a recording medium that record information. However, the use of the present invention is not limited to the above-described video data recording apparatus, video data recording method, video data recording program, and recording medium.

 Background art

 [0002] Conventionally, a drive recorder that records the surrounding situation of a running vehicle is known, similar to a flight recorder mounted on an airplane. Such a drive recorder has, for example, a front camera for photographing the front of the vehicle, a rear camera for photographing the rear, and a function of writing the front and rear images in a predetermined area of the image memory in synchronization with a reference signal. In addition, recording information obtained by adding vehicle position information and time information to image memory information is regularly recorded in the buffer memory. Then, the video is stored in the storage memory triggered by the fact that it exceeds the predetermined value of the impact detection sensor, and when encountering an incident such as a escaping incident, a proposal is made to identify the escaping vehicle and use it as verification data in the accident. (For example, see Patent Document 1 below.)

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2004-224105

 Disclosure of the invention

 Problems to be solved by the invention

[0004] However, with the technique described in Patent Document 1 described above, the recording information in which the vehicle position information and the time information are added to the image memory information must be constantly recorded in the buffer memory. Therefore, an example is the problem that the buffer memory must always be used while driving. In addition, even when there is no object in the vicinity of the vehicle, that is, when there is no accident, the video is stored as a trigger when it exceeds the predetermined value of the impact detection sensor, so a lot of unnecessary video is stored. This makes the storage An example is the problem that the memory is full and fails to record the moment of the accident. In addition, even when the video at the moment of the accident was recorded, when verifying the video stored later, there is an example of the problem that much labor is required for verification because there are many unnecessary videos.

 Means for solving the problem

 In order to solve the above-described problems and achieve the object, a video data recording apparatus according to the invention of claim 1 includes a detection unit that detects an object around a moving body, and an object detected by the detection unit. Calculating means for calculating the relative distance between the moving body, the determining means for determining whether the relative distance calculated by the calculating means is smaller than a threshold, and the relative distance being smaller than the threshold by the determining means Control means for recording in the memory the video data of the moving body force and the like whose force has been photographed.

 [0006] Further, the video data recording method according to the invention of claim 6 includes a detection step of detecting an object around the moving body, and a relative distance between the object detected by the detection step and the moving body. A calculation step for calculating the force, a determination step for determining whether the relative distance calculated by the calculation step is smaller than a threshold value, and a force when the relative distance is determined to be smaller than the threshold value by the determination step. And a control step of recording the video data having the moving physical strength in a memory.

 [0007] Further, a video data recording program according to the invention of claim 7 causes a computer to execute the video data recording method of claim 6.

 [0008] Further, a recording medium according to the invention of claim 8 is characterized in that the video data recording program of claim 7 is recorded in a computer-readable state.

 Brief Description of Drawings

 FIG. 1 is a block diagram showing a functional configuration of a video data recording apparatus according to an embodiment.

 FIG. 2 is a flowchart showing a video data recording process procedure of the video data recording apparatus.

[FIG. 3] FIG. 3 is a block diagram showing a hardware configuration of a navigation apparatus that is useful in this embodiment. FIG.

 [FIG. 4] FIG. 4 is an explanatory diagram showing a radar performance distance and a threshold value.

 FIG. 5 is an explanatory diagram showing a difference in threshold value depending on relative speed.

 FIG. 6 is a flowchart showing the contents of processing of the navigation device.

 Explanation of symbols

[0010] 100 video data recording device

 101 Shooting unit

 102 Recording section

 103 Detector

 104 Calculation unit

 105 Speed calculator

 106 Change section

 107 Judgment part

 108 Control unit

 BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of a video data recording apparatus, a video data recording method, a video data recording program, and a recording medium according to the present invention will be described in detail with reference to the accompanying drawings.

 [0012] (Embodiment)

 (Functional configuration of video data recording device 100)

 First, the functional configuration of the video data recording apparatus 100 that is relevant to the embodiment of the present invention will be described. FIG. 1 is a block diagram of a functional configuration of the video data recording apparatus according to the embodiment.

In FIG. 1, a video data recording apparatus 100 includes an imaging unit 101, a recording unit 102, a detection unit 103, a calculation unit 104, a speed calculation unit 105, a change unit 106, a determination unit 107, And a control unit 108. The imaging unit 101 is installed on a moving body and captures video data around the moving body. The imaging unit 101 may be installed in the front, rear, side, etc. of the moving body, and may shoot only the installed direction or may shoot all directions. The shooting unit 101 The video data around the moving object may be constantly shot, or the shooting may be started when the video data is recorded in the recording unit 102 under the control of the control unit 108 described later. In addition, the photographing unit 101 may be capable of changing the photographing direction, or may be capable of changing the photographing magnification.

The recording unit 102 records the video data photographed by the photographing unit 101. The recording unit 102 does not always need to overwrite and update the video data in a temporary recording memory such as a buffer memory, and only records the recorded data in a memory such as a storage memory that does not lose the recorded information even when the power is turned off. May be.

 [0015] The detection unit 103 detects an object around the moving body. Specifically, the object around the moving object is, for example, another moving object, a person, a fallen object, or the like, and is an object that may come into contact with the moving object. The detection unit 103 detects the position information of the object using a radar such as an infrared sensor. Further, the detection unit 103 may be able to determine the type of object (vehicle, human, etc.) around the moving body. The detection of the object around the moving body by the detection unit 103 is configured to be able to detect farther than a threshold value described later.

 The calculating unit 104 calculates the relative distance between the object detected by the detecting unit 103 and the moving body. The relative distance is a distance from the object to the moving body. The relative distance changes continuously when the moving object and Z or the object are moving.

 The speed calculation unit 105 calculates the relative speed between the object and the moving body based on the detection result detected by the detection unit 103 and the relative distance calculated by the calculation unit 104. The speed calculation unit 105 calculates the relative speed based on, for example, the position information of the object detected by the detection unit 103, the change in the relative distance calculated by the calculation unit 104, and the time required for the relative distance to change. . Relative speed is the speed of an object relative to a moving object. Further, the speed calculation unit 105 may calculate the relative speed by analyzing the video data captured by the imaging unit 101. In this case, the speed calculation unit 105 calculates the relative speed based on the change in size of the object in the video data over time.

The changing unit 106 changes the threshold value according to the relative speed calculated by the speed calculating unit 105. The threshold value is a value for determining whether or not the object is at a close distance to the moving body. The threshold may be changeable by the user. The change unit 106 records, for example, The recording time for recording the video data is set in part 102, and the threshold value is changed according to the set recording time and relative speed. Therefore, the threshold for an object with a high relative speed, such as an opposing moving body, increases, and the threshold for an object with a low relative speed, such as a pedestrian, decreases.

 [0019] The determination unit 107 determines whether or not the relative distance calculated by the calculation unit 104 is smaller than a threshold value. That is, the determination unit 107 determines whether or not the object is at a close distance with respect to the moving object. Further, the determination unit 107 determines whether or not the relative distance is smaller than the threshold value changed by the changing unit 106. Furthermore, even when there are a plurality of objects, the determination unit 107 determines whether or not the relative distance between the moving object and each object is smaller than each threshold value.

 [0020] The control unit 108 records the video data of the moving physical strength taken when the determining unit 107 determines that the relative distance is smaller than the threshold value or the threshold value changed by the changing unit 106. To record. Then, the control unit 108 records the video data until the determination unit 107 determines that the relative distance is greater than the threshold value in the recording unit 102. In addition, the control unit 108 may record the video data from the moving body that has been photographed until a predetermined time has elapsed in the recording unit 102 when the determination unit 107 determines that the relative distance is smaller than the threshold value. Further, the control unit 108 may be configured not to record the video data from the moving body in the recording unit 102 when the determining unit 107 determines that the relative distance is larger than the threshold value. Further, the control unit 108 may control the imaging unit 101 to always perform imaging, or may start imaging when the relative distance is determined to be smaller than the threshold value.

 [0021] (Video Data Recording Processing Procedure of Video Data Recording Device 100)

 Next, the video data recording processing procedure of the video data recording apparatus 100 will be described. FIG. 2 is a flowchart showing a video data recording processing procedure of the video data recording apparatus. In the flowchart of FIG. 2, the process waits until the detection unit 103 detects an object around the moving body (step S201: No loop). When an object is detected (step S201: Yes), the calculation unit 104 calculates the relative distance between the object detected in step S201 and the moving body (step S202).

Next, the speed calculation unit 105 calculates the relative speed between the object detected in step S201 and the moving body (step S203), and the relative speed calculated in step S203. The threshold value is changed according to the degree (step S204). Then, it is determined whether or not the relative distance calculated in step S202 is smaller than the threshold (step S205). When the relative distance is smaller than the threshold (step S205: Yes), recording is started by control by the control unit 108. (Step S206). That is, the control unit 108 records the video data of the moving physical force whose force has been captured in the recording unit 102 when it is determined in step S205 that the relative distance is smaller than the threshold value.

 [0023] Next, it waits until the relative distance becomes larger than the threshold (step S207: No loop), and when the relative distance becomes larger than the threshold (step S207: Yes), it is recorded by the control by the control unit 108. Is stopped (step S208), and a series of processing ends. On the other hand, if it is determined in step S205 that the relative distance is greater than the threshold (step S205: No), the process returns to step S202 and the subsequent processing is repeated.

 In the flowchart of FIG. 2, the threshold value is changed in step S204, but the present invention is not limited to this. For example, the threshold value may not be changed from a preset value, and the setting may be changed by the user.

 In the flowchart of FIG. 2, when the relative distance is larger than the threshold value in step S205: No, the force is configured to return to step S202. However, the present invention is not limited to this. For example, when the object passes through the moving body, or when the relative distance between the object and the moving body becomes larger than the distance that can be detected by the detecting unit 103, the series of processing may be ended as it is.

 [0026] In the flowchart of FIG. 2, the recording is started in step S206, but the present invention is not limited to this. For example, video data and audio data inside the moving object may be recorded together with video data around the moving object.

 Further, in the flowchart of FIG. 2, the recording is started in step S206. However, the recording may be started, and the imaging unit 101 may be controlled by the control unit 108 to start the imaging. . In addition, photographing may always be performed.

In the flowchart of FIG. 2, the force for determining whether or not the relative distance is larger than the threshold value in step S207 is not limited to this. For example, in step S206, memory is started and the time of force is counted, and after a predetermined time elapses, step The process may move to S208 to stop recording.

[0029] As described above, according to the video data recording apparatus 100 of the embodiment, the relative distance between the object detected by the detection unit 103 and the moving body is calculated by the calculation unit 104, and the determination unit 10 7 Thus, when it is determined that the relative distance is smaller than the threshold value, the video data of the moving physical force that has been captured can be recorded in the recording unit 102. Therefore, the control unit 108 records video data for the drive recorder only when the object is close to the moving object.

Therefore, unnecessary recording can be avoided and the free space of the recording unit 102 can be secured. As a result, the user who has boarded the mobile object can reliably record the accident record.

 In addition, according to the video data recording apparatus 100 of the embodiment, the speed calculation unit 105 is based on the detection result detected by the detection unit 103 and the relative distance calculated by the calculation unit 104. And the relative speed of the moving body is calculated. Then, the changing unit 106 changes the threshold according to the relative speed calculated by the speed calculating unit 105. Therefore, the control unit 108 can record the video data from the moving body in which the force is photographed when the determination unit 107 determines that the relative distance is smaller than the changed threshold value, in the recording unit 102. As a result, the user who has boarded the moving body can record video data for the drive recorder at the same time even on objects of different relative speeds.

 [0031] Furthermore, according to the video data recording apparatus 100 of the embodiment, the control unit 108 records the video data until the determination unit 107 determines that the relative distance is greater than the threshold value in the recording unit 102. Can do. Therefore, the control unit 108 can secure a free space in the recording unit 102 by avoiding unnecessary long recording of video data for the drive recorder. As a result, the user who has boarded the mobile object can reliably record the accident record.

[0032] Further, according to the video data recording apparatus 100 of the embodiment, the control unit 108 has also taken a force until a predetermined time has elapsed when the determination unit 107 determines that the relative distance is smaller than the threshold. Video data having moving physical strength can be recorded in the recording unit 102. Therefore, the control unit 108 can avoid unnecessary recording of video data for the drive recorder by stopping recording after a predetermined time elapses, for example, when the moving body comes into contact with an object. As a result, the user who has boarded the mobile object can reliably record the accident record. Can be made.

 [0033] Also, according to video data recording apparatus 100 of the embodiment, control unit 108 records video data from a moving body when recording unit 107 determines that the relative distance is greater than the threshold. Can not record in 102. Therefore, the control unit 108 can avoid recording video data for the drive recorder for an object that is not close to the moving object. As a result, the user who has boarded the mobile object can reliably record the accident record.

 Example

 [0034] Examples of the present invention will be described below. In the present embodiment, an example in which the video data recording device of the present invention is implemented by a navigation device mounted on a moving body such as a vehicle (including a four-wheeled vehicle and a two-wheeled vehicle) will be described.

 [0035] (Hardware configuration of navigation device)

 Next, a hardware configuration of the navigation apparatus 300 that is useful in the present embodiment will be described. FIG. 3 is a block diagram showing the hardware configuration of the navigation apparatus that is useful in this embodiment. In FIG. 3, the navigation device 300 includes a CPU 301, a ROM 302, a RAM 303, a magnetic disk drive 304, a magnetic disk 305, an optical disk drive 310, an optical disk 307, an audio IZF (interface) 308, and a microphone 309. A speaker 310, an input device 311, a video IZF 312, a display 313, a communication IZF 314, a GPS unit 315, various sensors 316, and a camera 317. Each component 301 to 317 is connected by a bus 320.

First, the CPU 301 governs overall control of the navigation device 300. The ROM 302 records programs such as a boot program, a data update program, a relative distance calculation program, a relative speed calculation program, and a threshold change program. The RAM 303 is used as a work area for the CPU 301. That is, the CPU 301 controls the entire navigation device 300 by executing various programs recorded in the ROM 302 while using the RAM 303 as a work area. Further, if there is an instruction to display the drive recorder image by the user or the like, the CPU 301 displays it on the display 313 described later. [0037] The relative distance calculation program calculates the relative distance between an object in the vicinity of the host vehicle detected by various sensors 316 described later and the host vehicle. Specifically, for example, the relative distance is calculated using the difference between the longitude and latitude of the position information of the vehicle and the position information of the object.

 [0038] The relative speed calculation program calculates the relative speed between the host vehicle and the object. Specifically, for example, using the detection results detected by various sensors 316 described later, the relative distance calculated by the relative distance calculation program, and the time corresponding to the change in the relative distance, Let the relative speed be determined.

 [0039] The threshold value change program uses the relative speed calculated by the relative speed calculation program, and the recording time of the drive recorder image in which the time until the vehicle comes into contact with the object is preliminarily set. The threshold value is changed so that The threshold value is a trigger for capturing an image for a drive recorder. When an object is within the threshold value from the host vehicle, capturing is started by a camera 317 described later.

 The magnetic disk drive 304 controls reading and writing of data on the magnetic disk 305 according to the control of the CPU 301. The magnetic disk 305 records data written under the control of the magnetic disk drive 304. As the magnetic disk 305, for example, HD (node disk) or FD (flexible disk) can be used.

 In addition, the optical disk drive 306 controls data reading / writing to the optical disk 307 according to the control of the CPU 301. The optical disc 307 is a detachable recording medium from which data is read according to the control of the optical disc drive 306. The optical disk 307 can use a writable recording medium. The removable recording medium may be a power MO of the optical disk 307, a memory card, or the like.

 [0042] As an example of information recorded on the magnetic disk 305 and the optical disk 307, images and sounds inside and outside the vehicle obtained by a camera 317 and a microphone 309, which will be described later, and the current position of the vehicle detected by a GPS unit 315, which will be described later Information, output values from various sensors 316 described later, and the like. These pieces of information are recorded by the drive recorder function of the navigation device 300 and are used as verification materials when a traffic accident occurs.

[0043] Other examples of information recorded on the magnetic disk 305 and the optical disk 307 Examples include map data and functional data. Map data includes background data that represents features (features) such as buildings, rivers, and the surface of the earth, and road shape data that represents the shape of the road, and is composed of multiple data files divided by district. It has been done.

 [0044] The road shape data further includes traffic condition data. The traffic condition data includes, for example, the presence / absence of traffic lights and pedestrian crossings, the presence / absence of highway doorways and junctions, the length (distance) of each link, road width, direction of travel, road type (high speed). Road, toll road, general road, etc.).

 [0045] The function data is three-dimensional data representing the shape of the facility on the map, character data representing the description of the facility, and other various data other than the map data. Map data and function data are recorded in blocks divided by district or function. Specifically, for example, the map data is recorded in such a state that each map can be divided into blocks such that each map represents a predetermined area on the map displayed on the display screen. Also, for example, the function data is recorded in a state where each function can be divided into a plurality of blocks so as to realize one function.

 [0046] In addition to the above-described 3D data and character data, the function data is data for realizing functions such as program data that realizes route search, calculation of required time, route guidance, and the like. . Each of the map data and function data is composed of multiple data files divided by district or function.

 The audio IZF 308 is connected to a microphone 309 for audio input and a speaker 310 for audio output. The voice received by the microphone 309 is AZD converted in the voice IZF308. For example, the microphone 309 may be installed near the sun visor of the vehicle, and the number may be one or more. From the speaker 310, a sound obtained by DZA-converting a predetermined sound signal in the sound IZF 308 is output. Note that sound input from the microphone 309 can be recorded on the magnetic disk 305 or the optical disk 307 as sound data.

[0048] Examples of the input device 311 include a remote controller having a plurality of keys for inputting characters, numerical values, and various instructions, a keyboard, and a touch panel. The input device 311 may be realized by any one of a remote control, a keyboard, and a touch panel. It is also possible to realize with multiple forms.

 The video IZF 312 is connected to the display 313. Specifically, the video IZF312 is output from, for example, a graphic controller that controls the entire display 313, a buffer memory such as VRAM (Video RAM) that temporarily records image information that can be displayed immediately, and a graphic controller. It is configured by a control IC that controls the display 313 based on image data.

 [0050] The display 313 displays icons, cursors, menus, windows, or various data such as characters and images. On the display 313, the map data force described above is drawn in two or three dimensions. The map data displayed on the display 313 can be displayed with a mark representing the current position of the vehicle on which the navigation device 300 is mounted. The current position of the vehicle is calculated by the CPU 301.

 [0051] As the display 313, for example, a CRT, a TFT liquid crystal display, a plasma display, or the like can be used. The display 313 is installed near the dashboard of the vehicle, for example. A plurality of displays 313 may be installed on the vehicle, for example, near the dashboard of the vehicle or around the rear seat of the vehicle.

 Communication IZF 314 is connected to a network via radio and functions as an interface between navigation device 300 and CPU 301. The communication I / F 314 is further connected to a communication network such as the Internet via radio and functions as an interface between the communication network and the CPU 301.

 [0053] Communication networks include LANs, WANs, public line networks, mobile phone networks, and the like. Specifically, the communication IZF314 is composed of, for example, an FM tuner, VICS (Vehicle Information and Communication System) Z beacon resino, wireless navigation device, and other navigation devices. Get road traffic information such as traffic regulations. VICS is a registered trademark.

[0054] The GPS unit 315 receives radio waves from GPS satellites and outputs information indicating the current position of the vehicle. The output information of the GPS unit 315 is used when the CPU 301 calculates the current position of the vehicle together with output values of various sensors 316 described later. The information indicating the current position is information that identifies one point on the map data, for example, latitude'longitude, altitude, etc. The

 Various sensors 316 output information for determining the position and behavior of the vehicle, such as a vehicle speed sensor, an acceleration sensor (G sensor), and an angular velocity sensor. The output values of the various sensors 316 are used by the CPU 301 to calculate the current position of the vehicle and the amount of change in speed and direction. Various sensors 316 detect position information of objects around the host vehicle. Specifically, for example, the position information of an object such as the front, side, and rear of the vehicle is detected by a radar such as an infrared sensor. The radar shall be such that the performance distance is always greater than the threshold that is changed by the threshold change program. Here, the object may cause an accident of the own vehicle, such as an oncoming vehicle, a following vehicle, a human being, or a fallen object.

 [0056] The camera 317 captures an image inside or outside the vehicle. The camera 317 may always shoot a video, or may start video shooting when it is determined that the object is within the threshold. The image can be either a still image or a movie.For example, the camera 317 captures the behavior of the passengers inside the vehicle, and the captured image is output to a recording medium such as the magnetic disk 305 or optical disk 307 via the image IZF312. . The camera 317 captures the situation outside the vehicle, and outputs the captured image to a recording medium such as the magnetic disk 305 or the optical disk 307 via the image IZF 312. In addition, the camera 317 has an infrared camera function, and can capture an image of an object existing outside the vehicle even in night vision such as nighttime. The video output to the recording medium is overwritten and saved as a drive recorder image.

 [0057] In addition, the camera 317 may be capable of changing the shooting direction. Specifically, for example, the shooting direction may be changed according to the position information of objects around the vehicle. Further, the camera 317 may be capable of changing the magnification. Specifically, for example, when the threshold value varies depending on the relative speed, the magnification may be changed to match the threshold value.

[0058] The imaging unit 101, the recording unit 102, the detection unit 103, the calculation unit 104, the determination unit 107, and the control unit 108 included in the video data recording apparatus 100 illustrated in FIG. 1 are the navigation apparatus 300 illustrated in FIG. CPU 301 executes a predetermined program using programs and data recorded in ROM 302, RAM 303, magnetic disk 305, optical disk 307, etc. The function is realized by controlling each part in the Yong apparatus 300.

 That is, the navigation device 300 of the embodiment executes the video data recording program recorded in the ROM 302 as a recording medium in the navigation device 300, so that the video data recording device 100 shown in FIG. The provided functions can be executed by the video data recording processing procedure shown in FIG.

 [0060] (Radar performance distance and threshold)

 Next, a radar for detecting objects around the vehicle included in various sensors 316 will be described with reference to FIG. Fig. 4 is an explanatory diagram showing the radar performance distance and threshold. In FIG. 4, a host vehicle 401, an oncoming vehicle 402, a radar performance distance 403, and a threshold 404 are shown. The radar performance distance 403 is a distance at which the radar emitted by the host vehicle 401 can detect the position information of the object.

 In FIG. 4, the host vehicle 401 emits a radar to obtain position information of an object existing in front of the vehicle. Then, the position information of the oncoming vehicle 402 is detected by the radar, and the threshold value 404 is changed 'by the threshold value changing program. As shown in Fig. 4, the radar performance distance 403 is larger than the threshold 404.

 In the description of FIG. 4, the own vehicle 401 is not limited to the force that emits radar forward. For example, you can emit radar on both sides and behind the vehicle 401! /, And you can make a radar emit around 360 degrees around your vehicle 401!

 [0063] (Difference in threshold due to relative speed)

 Next, the difference in threshold value depending on the relative speed will be described with reference to FIG. FIG. 5 is an explanatory diagram showing the difference in threshold value depending on the relative speed. In FIG. 5, a host vehicle 401, an oncoming vehicle 402, a threshold 404 for the oncoming vehicle 402, a pedestrian 501 and a threshold 502 for the pedestrian 501 are shown.

In FIG. 5, the recording time until the own vehicle 401 comes into contact with the object is set to 3 seconds. Therefore, the threshold 404 for the oncoming vehicle 402 whose relative speed to the host vehicle 401 is lOmZs is 30 m. Further, the threshold value 502 for the pedestrian 501 whose relative speed with the own vehicle 401 is lmZs is 3 m. Thus, the threshold value varies depending on the relative speed with the host vehicle 401. In the explanatory diagram of FIG. 5, the case where the recording time is set to 3 seconds has been described, but the present invention is not limited to this. For example, the recording time may be settable by the user.

 [0066] (Processing content of navigation device 300)

 Next, the processing contents of the navigation device 300 will be described. FIG. 6 is a flowchart showing the contents of the processing of the navigation device. In the flowchart of FIG. 6, first, photographing outside the vehicle is started by the camera 317 (step S601). Shooting outside the vehicle is, for example, a moving image of a certain time. Then, the various sensors 316 wait until an object around the vehicle is detected (step S602: No loop). If an object is detected (step S602: Yes), the detection is performed in step S602. The relative distance between the detected object and the vehicle is calculated (step S603). Further, the relative speed between the object detected in step S602 and the host vehicle is calculated (step S604).

 Next, the recording time preliminarily set by the user is read (step S605), and it is determined whether the recording capacities of the magnetic disk 305 and the optical disk 307 are sufficient (step S606). Specifically, for example, whether or not there is sufficient capacity to record the video data for the recording time read out in step S605, the free capacity of the magnetic disk 305 and the optical disk 307 that record the captured video data. Determine whether. If the recording capacity is sufficient in step S606 (step S606: Yes), using the detection result detected in step S602, the relative speed calculated in step S604, and the recording time read in step S605, The threshold value is changed (step S607).

 On the other hand, if the recording capacity is not sufficient in step S606 (step S606: No), the recording time is changed (step S608). Then, the threshold value is changed using the new recording time changed in step S608 (step S607).

Next, it is determined whether or not the force detected in step S602 is within the threshold (step S609). That is, it is determined whether or not the relative distance between the object and the moving object is smaller than the threshold value. If the object is within the threshold value (step S609: Yes), and therefore the relative distance is smaller than the threshold value, recording is started on the magnetic disk 305 and the optical disk 307 (step S610). On the other hand, if the object is not within the threshold value in step S609 (step S6 09: No), the process returns to step S602 and the subsequent processing is repeated.

 [0070] After recording is started in step S610, it is determined whether or not the G sensor value of the host vehicle has exceeded a predetermined value (step S611), and whether or not the object has fallen out of the threshold value. If the G sensor value does not exceed the predetermined value (Step S611: No) and the object has moved out of the threshold (Step S612: Yes), the recording is stopped (Step S612). Step S613), and the series of processing ends.

 [0071] On the other hand, if the G sensor value of the host vehicle exceeds the predetermined value in step S611 (step S611: Yes), there is a possibility that an accident has occurred. If the predetermined time has elapsed (step S614: Yes), the recording is stopped (step S613), and the series of processing ends as it is. In step S611 and step S612, if the G sensor value does not exceed the predetermined value (step S611: No) and the object has not released the threshold internal force (step S612: No), step S611 is entered. Return and repeat the subsequent processing.

 In the flowchart of FIG. 6, when a predetermined time has elapsed in step S614: Yes, the force is shifted to step S613 and recording is not limited to this. For example, even if the predetermined time has not elapsed, when the G sensor value returns from the predetermined value to the predetermined value or less, the process may proceed to step S613 to stop the recording. In addition, if the predetermined time has elapsed in step S614: Yes, the force is set to stop the recording by moving to step S613. The process is not limited to this, and the process may be performed after that. Oh ,.

 In the flowchart of FIG. 6, if the G sensor value does not exceed the predetermined value in step S611: No, the recorded video data may be deleted from the memory.

 Further, in the flowchart of FIG. 6, the force for determining whether or not the G sensor value is greater than or equal to a predetermined value in step S611 is not limited to this. For example, the configuration is such that step S611 is omitted, that is, the recording is stopped only by determining whether or not the force of the object has deviated from the threshold in step S612 without determining whether or not the G sensor value is greater than or equal to a predetermined value. It ’s good.

As described above, according to the navigation device 300 of the embodiment, the detection unit 103 The calculation unit 104 calculates the relative distance between the detected object and the moving object, and when the determination unit 107 determines that the relative distance is smaller than the threshold value, the image data of the moving body force that was captured is also recorded in the recording unit 102. Can be recorded. Therefore, the control unit 108 can record the video data for the drive recorder only when the object is in the vicinity of the moving body, so that unnecessary recording can be avoided and the free space of the recording unit 102 can be secured. As a result, the user who has boarded the mobile object can reliably record the accident record.

 Further, according to the navigation apparatus 300 of the embodiment, the speed calculation unit 105 moves based on the detection result detected by the detection unit 103 and the relative distance calculated by the calculation unit 104. Calculate the relative speed with the body. Then, the changing unit 106 changes the threshold according to the relative speed calculated by the speed calculating unit 105. Therefore, the control unit 108 can record, in the recording unit 102, video data of the moving body force whose force is also photographed when the determination unit 107 determines that the relative distance is smaller than the changed threshold value. As a result, a user who has boarded the moving body can record video data for a drive recorder of the same time even on objects of different relative speeds.

 Furthermore, according to the navigation device 300 of the embodiment, the control unit 108 can record the video data until the determination unit 107 determines that the relative distance is greater than the threshold value in the recording unit 102. it can. Therefore, the control unit 108 can secure a free space in the recording unit 102 by avoiding unnecessary long recording of video data for the drive recorder. As a result, the user who has boarded the mobile object can reliably record the accident record.

 [0078] Also, according to the navigation device 300 of the embodiment, the control unit 108 has the force when the determination unit 107 determines that the relative distance is smaller than the threshold value. Video data can be recorded in the recording unit 102. Therefore, the control unit 108 can avoid unnecessary recording of video data for the drive recorder by stopping the recording after a predetermined time elapses, for example, when the moving body comes into contact with the object. As a result, the user who has boarded the mobile object can reliably record the accident record.

Further, according to the navigation device 300 of the embodiment, the control unit 108 is controlled by the determination unit 107. Therefore, when it is determined that the relative distance is greater than the threshold value, the video data with the moving physical strength can not be recorded in the recording unit 102. Therefore, the control unit 108 can avoid recording video data for the drive recorder for an object that is not close to the moving body. As a result, a user who has boarded a mobile object can reliably record accident records.

[0080] As described above, according to the video data recording apparatus, video data recording method, video data recording program, and recording medium of the present invention, the relative distance and relative speed between the object around the moving object and the moving object. When the relative distance is determined to be smaller than the threshold value changed according to the relative speed, video data is recorded. Therefore, unnecessary recording of video data for the drive recorder can be avoided, and the free capacity of the recording unit 102 can be secured. As a result, the user who has boarded the moving body can reliably record the accident record.

 Note that the video data recording method described in the present embodiment can be realized by executing a prepared program by a computer such as a personal computer or a workstation. This program is recorded on a computer-readable recording medium such as a hard disk, a flexible disk, a CD-ROM, an MO, or a DVD, and is executed by being read by the computer. The program may be a transmission medium that can be distributed via a network such as the Internet.

Claims

The scope of the claims  [1] detection means for detecting objects around the moving body;  Calculation means for calculating a relative distance between the object detected by the detection means and the moving body;  Determining means for determining whether the relative distance calculated by the calculating means is smaller than a threshold;  Control means for recording, in a memory, video data of the moving body force captured by the force when the determination means determines that the relative distance is smaller than the threshold;  A video data recording apparatus comprising:  [2] Speed calculation means for calculating a relative speed between the object and the moving body based on the detection result detected by the detection means and the relative distance;  Changing means for changing the threshold according to the relative speed calculated by the speed calculating means,  The determining means determines whether the relative distance is smaller than the threshold value changed by the changing means;  2. The control unit according to claim 1, wherein when the relative distance is determined to be smaller than the changed threshold value, video data from the moving body photographed by the control unit is recorded in a memory. Video data recording device. 3. The video data recording apparatus according to claim 1, wherein the control unit records video data until the relative distance is determined to be larger than the threshold by the determination unit. .  [4] The control means records, in a memory, video data of the moving body force that has been photographed until a predetermined time has elapsed when the relative distance is determined to be smaller than the threshold by the determination means. The video data recording apparatus according to claim 1.  [5] The control means does not record the video data from the moving body in a memory when the determination means determines that the relative distance is greater than the threshold. 5. The video data recording device according to any one of 1 to 4. [6] A detection process for detecting objects around the moving body, A calculation step of calculating a relative distance between the object detected by the detection step and the moving body;  A determination step of determining whether or not the relative distance calculated by the calculation step is smaller than a threshold;  A control step of recording, in a memory, video data of the moving body force that has been force-photographed when the relative distance is determined to be smaller than the threshold value by the determination step;  A video data recording method comprising: [7] A video data recording program which causes a computer to execute the video data recording method according to claim 6. [8] A computer-readable recording medium in which the video data recording program according to claim 7 is recorded.