JP2012015974A - Intercom system - Google Patents

Abstract

An intercom system capable of reliably recognizing a visitor's behavior is provided.
In a conventional intercom system, a real-time image (moving image) captured after a call operation is performed on a slave unit is displayed on the monitor of the master unit. For this reason, the visitor who has finished the call operation is unconsciously or intentionally deviated from the imaging range of the imaging unit 1 and is displayed on the display unit 101 of the main unit M at the time when the resident (responder) who has heard the ringing sound watches. There were cases where visitors were not shown in the image. However, in the intercom system according to the present embodiment, even if the visitor who has finished the call operation unconsciously or intentionally deviates from the imaging range of the imaging unit 1, an intro image that is highly likely to be displayed is displayed. Since it is repeatedly transmitted from the subunit | mobile_unit S to the main | base station M, and is displayed on the display part 101 of the main | base station M, a resident can recognize a visitor's behavior reliably.
[Selection] Figure 1

Description

  The present invention relates to an intercom system.

  As a conventional intercom system, for example, there is an intercom system with a television described in Patent Document 1. This conventional system includes a doorphone slave unit with a camera and an interphone master unit with a monitor TV, and the TV monitor of the interphone master unit for a predetermined time after the call button is pressed on the doorphone slave unit. A still image captured by the doorphone slave unit is displayed, and after a response operation (handset hook-off) is performed by the interphone master unit, a moving image captured by the doorphone slave unit is displayed on the TV monitor of the interphone master unit. It is.

Japanese Patent No. 3177711

  However, in the above-described conventional system, a visitor that should originally appear may not be reflected in the still image displayed until the response operation is performed on the interphone master unit. In other words, depending on the timing at which the camera of the door phone slave unit captures a still image, there is a possibility that the visitor may be out of the imaging range of the camera. And if a visitor is not reflected in the still picture displayed on a television monitor, it will become difficult for a resident to recognize a visitor's behavior reliably.

  The present invention has been made in view of the above problems, and an object thereof is to provide an intercom system that can reliably recognize the behavior of a visitor.

  The intercom system according to the present invention includes a first caller used for a call by a visitor, a second caller used for a call by an attendant responding to the visitor, and a vicinity of the first caller. An image pickup device having an image pickup range, wherein sound is transmitted between the first caller and the second caller, and an image picked up by the image pickup device is transmitted to the second caller An intercom system that is displayed on the second caller, wherein the first caller receives a call operation of the visitor and transmits a call signal to the second caller; And a voice communication means for acquiring the voice uttered by the visitor and transmitting the voice to the second telephone and transmitting the voice transmitted from the second telephone to the visitor. The imaging apparatus includes imaging means for capturing a moving image, Transmission means for transmitting a moving image picked up by the image pickup means to the second caller, wherein the second caller rings a ringing tone when receiving the call signal; From the transmission means, the voice uttered by the attendant is acquired and transmitted to the first telephone, and the voice transmitted from the first telephone is sounded and heard by the attendant. Display means for displaying the transmitted moving image, receiving means for receiving at least the response operation of the responder, and control means for displaying the moving image transmitted from the imaging device on the display means, The control means repeatedly displays a short-time moving image transmitted from the imaging device on the display means.

  In this intercom system, the imaging apparatus includes a storage unit that stores a short-time moving image captured by the imaging unit, and the transmission unit of the imaging apparatus stores a short time stored in the storage unit. It is preferable to repeatedly transmit a moving image to the second telephone.

  In this intercom system, the transmission unit of the imaging device uses either the short-time moving image stored in the storage unit or the real-time moving image captured by the imaging unit as a main screen and the other as the main screen. A moving image as a child screen is transmitted to the second telephone, and the control unit of the second telephone displays the moving image transmitted from the imaging device on the display unit and the reception In response to an operation input received by the means, the imaging apparatus is instructed to exchange the parent screen and the child screen, and the transmission means of the imaging apparatus transmits the moving image of the parent screen and the moving image of the child screen according to the instruction. It is preferable to transmit the replaced moving image to the second telephone.

  In this intercom system, the transmission unit of the imaging device transmits a short-time moving image stored in the storage unit and a real-time moving image captured by the imaging unit to the second telephone. The control means of the second telephone sets displays one of the short-time moving image and the real-time moving image on the main screen of the display means and displays the other moving image on the display means. It is preferable that the moving images displayed on the child screen and further displayed on the parent screen and the child screen are exchanged in accordance with an operation input received by the receiving unit.

  In this intercom system, it is preferable that the display unit of the second telephone set displays a part of the frames of the short-time moving image as a still image in response to an operation input received by the receiving unit.

  In this intercom system, it is preferable that the display unit of the second telephone set displays the short-time moving image at intervals of one to a plurality of frames in accordance with an operation input received by the receiving unit.

  In this intercom system, it is preferable that the imaging unit of the imaging device starts capturing the moving image for a short time when a calling operation is received by the calling unit of the first telephone.

  The intercom system includes a human detection unit that detects the presence of a person within a detection range including the vicinity of the first telephone, and the imaging unit of the imaging apparatus has a timing according to a detection result of the human detection unit. It is preferable to start capturing the moving image for a short time.

  In this intercom system, the image pickup means of the image pickup apparatus may be configured such that the short-time moving image at a timing from when the presence of a person is detected by the person detection means to when a call operation is received by the call means of the first caller. It is preferable to start imaging.

  In this intercom system, it is preferable that the imaging unit of the imaging apparatus starts capturing the moving image for a short time at the timing when the presence of a person is detected by the human detection unit.

  In this intercom system, the imaging unit of the imaging apparatus always captures a moving image and stores it in the storage unit, and the transmission unit is more predetermined than the timing when the presence of a person is detected by the human detection unit. It is preferable that the moving image captured at a timing that is back by time is read from the storage unit and transmitted to the second telephone.

  In this intercom system, it is preferable that the human detection means detects the presence of a person by performing image processing on a captured image obtained by imaging the detection range.

  In this intercom system, it is preferable that the storage unit of the imaging apparatus stores only other frames of the frames captured by the imaging unit except for at least the frame in which the visitor is not shown.

  In this intercom system, the transmission unit of the imaging device may supplement a portion of the frame that is not stored in the short-time moving image stored in the storage unit with another stored frame. It is preferable to transmit to the second telephone.

  The intercom system of the present invention has an effect that the behavior of the visitor can be recognized with certainty.

It is a block diagram which shows Embodiment 1 of the intercom system which concerns on this invention. It is a front view of the intercom child machine in the same as the above. It is a block diagram which shows Embodiment 2 of the intercom system which concerns on this invention.

  Interphone cordless handset with camera (installed in lobby if lobby is installed) S installed in the exterior entrance of housing unit or common entrance (lobby) of apartment housing with built-in imaging device The present invention is applied to an interphone system including an interphone master unit (hereinafter abbreviated as “master unit”) M that performs a call with an interphone slave unit (hereinafter abbreviated as “slave unit”) S. Embodiments will be described in detail with reference to the drawings. However, the imaging device may be configured separately from the slave unit S.

(Embodiment 1)
As shown in FIG. 1, the master unit M and the slave unit S are connected by a signal line Ls, and a voice signal is transmitted between the slave unit S and the master unit M via the signal line Ls. At the same time, an image (moving image) captured by the imaging device of the slave unit S is transmitted to the master unit M via the signal line Ls and displayed on the display unit 101 of the master unit M. Although not shown, the master unit M and the slave unit S have a microphone, a speaker, and voice collected by the microphone to the other party's phone via a signal line Ls (or a call line (not shown)). Calling means is provided for transmitting sound from a speaker and sounding from a speaker. However, since such communication means is well known in the art, illustration and description thereof are omitted.

  The base unit M is connected to a display unit 101 including a display device such as an LCD panel and a driver circuit that displays the moving image (video) by driving the display device, and the handset S via a signal line Ls. A signal transmission unit 100 that transmits audio signals, video signals, and control signals (digital transmission or frequency division multiplex transmission), an operation input unit 103 that accepts operation inputs such as response buttons (to be described later), and a parent device that controls the entire parent device M A control unit 102 and the like are provided. However, the signal transmission unit 100 also performs demodulation and decoding processing of the video signal transmitted from the slave unit S.

  The subunit | mobile_unit S is provided with the imaging part 1, the image memory | storage part 2, the signal transmission part 3, the image process part 4, the operation input part 5, and the control part 6. FIG. The imaging unit 1 includes an imaging element composed of a CCD image sensor or a CMOS image sensor, a lens that collects light on the imaging surface of the imaging element, and the like (none of which are shown). Note that the image sensor outputs a digital video signal (video signal) composed of a luminance component of Y and color difference components of U and V.

  The signal transmission unit 3 transmits an audio signal, a video signal, and a control signal to and from the signal transmission unit 101 of the parent device M via the signal line Ls. The signal transmission unit 3 also performs encoding (compression) processing of the video signal output from the imaging unit 1 and modulation processing for digitally modulating the encoded video signal (for example, BPSK or QPSK).

  The image storage unit 2 stores a video signal (image data) output from the imaging unit 1 in accordance with an instruction from the control unit 6 or allows it to pass without storage, and can be electrically rewritten to a flash memory or the like. It is composed of a non-volatile semiconductor memory.

  The image processing unit 4 combines the past video signal (image data) stored in the image storage unit 2 and the current (real-time) video signal (image data) passing through the image storage unit 2, A process of creating a video signal (image data) to be displayed simultaneously on the same screen with one image as a parent screen and the other image as a child screen (hereinafter referred to as “parent-child screen processing”) is performed.

  The operation input unit 5 has a large number of pushbutton switches. When these pushbutton switches are turned on, the operation input unit 5 accepts operation inputs corresponding to the pushbutton switches, and sends an operation signal corresponding to the received operation input to the control unit 6. Send it out. The operation input unit 5 also includes a display (for example, a 7-segment LED display) for displaying input contents as will be described later.

  The control unit 6 includes hardware such as a microcomputer and a memory, and software for executing various controls described later. For example, when an operation input for calling the base unit M is received by the operation input unit 5, the control unit 6 transmits a call signal from the signal transmission unit 3 to the base unit M via the signal line Ls. Then, a ringing tone is generated from the speaker of the base unit M that has received the calling signal. Further, when the response button of the base unit M is operated within a predetermined time after the ringing tone is sounded, a communication path via the signal line Ls is formed between the base unit M and the handset S, and the base unit M Interphone call is possible between the mobile phone S and the handset S. That is, in this embodiment, the handset S used by a visitor for a call corresponds to the first caller and the image pickup device, and the parent device M used by the respondent (resident) for the call corresponds to a second caller. To do.

  FIG. 2 shows an external view (front view) of the handset S configured as a lobby intercom. The housing 200 of the slave unit S is formed in a rectangular box shape when viewed from the front, and includes an imaging unit 1, an image storage unit 2, a signal transmission unit 3, an image processing unit 4, an operation input unit 5, and a control unit 6 therein. Each part is housed. In the center of the front surface of the housing 200, operation members 201 and 202 for pressing the push button switch of the operation input unit 5 are disposed. One operation member 201 corresponds to a push button switch for inputting a number from 0 to 1 or * (asterisk) and a push button switch for deleting the inputted number or asterisk. Further, the other operation member 202 determines the content (the dwelling unit number of the dwelling unit where the master unit M is installed) operated by operating the operation member 201 and transmits a call signal from the slave unit S to the master unit M. This corresponds to a push button switch. The contents (numerals) input by pressing the operation member 201 are displayed on a display device (for example, a 7-segment LED display) 203 disposed on the operation member 201 on the front surface of the housing 200. Is done. In addition, the lens of the imaging unit 1 is disposed next to the display 203 on the front surface of the housing 200. However, the lens is hidden by a cover 204 made of frosted glass. The position where the lens is arranged may be a position where the face of the visitor who pushes the operation member 201 can be imaged.

  Next, an operation until the visitor calls the parent device M of the visited residence unit using the child device S will be described. First, a visitor stands in front of the handset S and pushes the operation member 201 to input the dwelling unit number of the visited dwelling unit. The operation input unit 5 outputs an operation signal corresponding to the push button switch pressed by the operation member 201 to the control unit 6 every time the operation member 201 is pressed. The control unit 6 determines that the visitor has approached when the first operation signal is received from the operation input unit 5.

  Then, after determining that the visitor has approached, the control unit 6 activates the imaging unit 1 to acquire an image and stores an image (video signal) output from the imaging unit 1 in the image storage unit 2. Instruct. Here, before the operation member 201 is operated by a visitor, the imaging unit 1, the image storage unit 2, the signal transmission unit 3, and the image processing unit 4 are in a dormant state, and only the operation input unit 5 and the control unit 6 are in operation. It is working. However, the control unit 6 is in a standby state in which the power consumption of the microcomputer is suppressed, and returns to a normal operation state when the first operation signal is received from the operation input unit 5.

  The image storage unit 2 stores a short-time image after receiving an instruction from the control unit 6. That is, it is highly likely that a visitor who is pushing the operation members 201 and 202 of the slave unit S is reflected in this short-time image (moving image). However, the time for the image storage unit 2 to store the image is as short as necessary for the visitor to press the operation members 201 and 202 to operate the unit number of the visited unit as described above (for example, several seconds). 10 seconds). In the following, for the sake of simplicity, a short-time image (moving image) stored in the image storage unit 2 as described above is referred to as an “intro image”.

  When the operation member 202 of the operation input unit 5 is pushed, the control unit 6 determines the number sequence indicated by the operation signal received from the operation input unit 5 so far as the dwelling unit number, and the dwelling unit number is assigned. The control signal (calling signal) is transmitted from the signal transmission unit 3 to the parent device M. Further, the control unit 6 instructs the image storage unit 2 and the signal transmission unit 3 to repeatedly transmit the intro image stored in the image storage unit 2.

  On the other hand, when the base unit M receives a control signal (calling signal) matching the dwelling unit number assigned to itself at the signal transmission unit 100, the base unit control unit 102 sounds a ringing tone from the speaker. Further, the intro image transmitted from the slave unit S is received by the signal transmission unit 100, and the intro image is repeatedly displayed on the display unit 101 of the master unit M. Here, in the conventional intercom system, a real-time image (moving image) captured after a call operation is performed on the slave unit is displayed on the monitor of the master unit. For this reason, the visitor who has finished the call operation is unconsciously or intentionally deviated from the imaging range of the imaging unit 1 and is displayed on the display unit 101 of the main unit M at the time when the resident (responder) who heard the ringing sound watches. There were cases where visitors were not shown in the image. However, in the intercom system according to the present embodiment, even if the visitor who has finished the call operation as described above is unintentionally or intentionally deviated from the imaging range of the imaging unit 1, the visitor may be reflected. Since the high intro image is repeatedly transmitted from the slave unit S to the master unit M and displayed on the display unit 101 of the master unit M, there is an advantage that the resident can surely recognize the behavior of the visitor.

  Further, the signal transmission unit 3 of the slave unit S simply transmits the intro image read out from the image storage unit 2 over and over again, and displays the master unit M without any special processing. An intro image is repeatedly displayed on the part 101. Therefore, since the intro image is repeatedly displayed, the processing load of the base unit M does not increase, and the intro image can be displayed efficiently.

  When the operation input unit 103 of the base unit M accepts an operation input of the response button, the base unit control unit 102 causes the signal transmission unit 100 to transmit a control signal instructing to stop transmission of the intro image to the handset S. When the control signal is received by the signal transmission unit 3, the control unit 6 stops the transmission of the intro image to the image storage unit 2 and the signal transmission unit 3 in response to a transmission stop instruction from the parent device M. To instruct. When receiving an instruction from the control unit 6, the image storage unit 2 stops reading the intro image and passes the image (video signal) transmitted from the imaging unit 1 to the signal transmission unit 3. The signal transmission unit 3 transmits a real-time moving image sent from the imaging unit 1 to the parent device M instead of the intro image.

  On the other hand, the base unit M forms a communication path via the signal line Ls with the handset S to enable interphone calls, and displays real-time moving images transmitted from the handset S on the display unit 101. indicate.

  Here, in the response waiting period (hereinafter referred to as “intro period”) from when the ringing tone is sounded until the response button is operated, the intro image and the real-time image are distributed to the main screen and the sub screen. You may display on the display part 101 of the main | base station M simultaneously. That is, the image processing unit 4 executes parent-child screen processing, combines the intro image stored in the image storage unit 2 and the real-time image passing through the image storage unit 2, and one image is displayed on the parent screen. Then, an image (video signal) for simultaneously displaying the other image as a child screen on the same screen is created. The image of the parent / child screen created by the image processing unit 4 is transmitted from the signal transmission unit 3 to the parent device M, and two types of images (intro image and real-time image) are displayed on the display unit 101 of the parent device M. Is displayed. When an operation input for switching the parent / child screen is received by the operation input unit 103 of the parent device M, the parent device control unit 102 causes the signal transmission unit 100 to transmit a control signal instructing switching of the parent / child screen. Then, the control unit 6 of the child device S that has received the control signal instructs the image processing unit 4 to switch (replace) the image displayed on the parent screen and the image displayed on the child screen. As a result, the position of the image on the parent / child screen displayed on the display unit 103 of the parent device M is switched. However, it is also possible for the master unit control unit 102 of the master unit M to combine and replace the master screen and the slave screen.

  Incidentally, the image processing executed by the image processing unit 4 is not limited to the above-described parent-child screen processing. For example, when a pause operation input is received by the operation input unit 103 of the master unit M during the intro period, the control unit 6 of the slave unit S that has received the pause control signal from the master unit S receives the image processing unit 4. On the other hand, a part (one frame) of a plurality of frames constituting the intro image is extracted and repeatedly transmitted from the signal transmission unit 3 to the base unit M. As a result, on the display unit 103 of the parent device M, one frame repeatedly transmitted from the child device S is displayed as a still image.

  Alternatively, when an operation input for frame advance playback is received by the operation input unit 103 of the base unit M during the intro period, the control unit 6 of the slave unit S that has received the frame advance playback control signal from the base unit S performs image processing. Each frame constituting the intro image is sequentially transmitted from the signal transmission unit 3 to the base unit M with a time interval (for example, several hundred milliseconds to 1 second) sufficiently longer than the frame period. Let it transmit. As a result, the intro image transmitted from the slave unit S is displayed on the display unit 103 of the master unit M like frame-by-frame playback.

  By the way, the intro image is captured (stored) during a period (intro period) in which it is highly likely that the visitor is in the imaging range of the imaging unit 1. There may be cases where it is not shown, or only a part of the visitor's body (particularly a part other than the face) is shown. In such a case, for example, an image (frame) in which the visitor's face is not shown is not stored in the image storage unit 2, and only an image (frame) in which the visitor's face is shown is stored in the image storage unit 2. Thus, the visitor can be reliably recognized and the image storage unit 2 can be used efficiently.

  Therefore, the image processing unit 4 performs face detection processing on the image captured by the imaging unit 1, and stores in the image storage unit 2 only frames in which a region where a face is reflected (face existing region) is detected. You can do it. In the face detection process, for example, a human face characteristic part (eyes, nose, mouth, etc.) is extracted from an image acquired in advance by the imaging unit 1 to create a template, and the image is actually captured. This is a process of scanning a template with respect to an image and determining a region having a high matching (correlation) with the template as a human face existing region. Alternatively, the image processing unit 4 obtains an inter-frame difference between a plurality of consecutively acquired frames, determines the presence / absence of a person (moving body) from the difference image, and determines that a person exists. May be stored in the image storage unit 2.

  Moreover, the reproduction time of the intro image stored in the image storage unit 2 as described above is shorter than the time actually captured. Therefore, when the intro image is transmitted, if the signal transmission unit 3 transmits the frame part that is not stored with another frame (for example, frames before and after the non-stored frame), It can be avoided that the display time (reproduction time) of the intro image displayed on the M display unit 101 is shortened.

(Embodiment 2)
A block diagram of the slave unit S (imaging device) and the master unit M of this embodiment is shown in FIG. However, since the configurations of the master unit M and the slave unit S of the present embodiment are basically the same as those of the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

  The present embodiment is characterized in that the slave unit S includes human detection means (human sensor unit 7) that detects the presence of a person within a detection range including the vicinity of the slave unit S. The human sensor 7 is a passive type that detects the presence of a person by detecting heat rays (infrared rays) radiated from a human body with a pyroelectric element, or transmits ultrasonic waves or radio waves, There are active types that detect the presence of a person by receiving ultrasonic waves or radio waves that are reflected back to the person. The detection range of the human sensor unit 7 is formed in the vicinity of the handset S, and when a person enters the detection range, the human sensor unit 7 detects the presence of the person and sends a human body detection signal to the control unit 6. Is sent out.

  Upon receiving the human body detection signal, the control unit 6 returns from the standby state to the normal operation state, activates the imaging unit 1 to acquire an image, and outputs an image (video signal) output from the imaging unit 1 as an image storage unit. 2 to store. However, the control unit 6 that has received the human body detection signal does not immediately instruct the imaging unit 1 to acquire an image, but until the operation members 201 and 202 are pressed (until an operation input is received by the operation input unit 5). The image capturing unit 1 may be instructed to acquire an image and the image storage unit 2 may be instructed to store an image at an arbitrary timing. That is, there is a high possibility that the intro image in the present embodiment shows a visitor before operating the operation members 201 and 202 of the child device S. Therefore, if such an intro image is displayed on the display unit 101 of the master unit M, the behavior of the visitor before operating the operation members 201 and 202 can be confirmed, and thus there is an advantage that crime prevention can be improved.

  Here, the image pickup unit 1 and the image storage unit 2 are always operated, and when the storage capacity of the image storage unit 2 becomes insufficient until an instruction is received from the control unit 6, old images are sequentially deleted and new images are displayed. A time point (timing) that is stored and that is back by a predetermined time from the time point (timing) at which an instruction is received from the control unit 6 may be used as the start point of the intro image. That is, when the imaging range of the imaging unit 1 is wider than the detection range of the human sensor unit 7, as described above, an image is captured by the imaging unit 1 before being detected by the human sensor unit 7. Can be confirmed more reliably and appropriately.

  By the way, in any human sensor unit 7 of the passive type or the active type, a human body detection signal is output even when a moving body other than a human (for example, a small animal such as a dog or a cat) enters the detection range. There is a possibility. Therefore, when a human body detection signal is output from the human sensor unit 7, it is determined whether or not a person is reflected in the image acquired by the imaging unit 1, and the image is captured only when it is determined that a person is reflected. The image acquired by the unit 1 may be stored in the image storage unit 2. As a method for determining whether or not a person is shown, for example, an inter-frame difference between a plurality of frames acquired in succession may be obtained, and the presence / absence of a person (moving body) may be determined from the difference image. Such image processing (determination processing) can be performed by the image processing unit 4. In this way, the visitor's behavior can be confirmed more reliably.

S Intercom cordless handset (first telephone, imaging device)
M Intercom base unit (second phone)
1 Imaging unit (imaging means)
2 Image storage unit (storage means)
3 Signal transmission section (transmission means)
101 Display (display means)
102 Base unit controller (control means)

Claims (14)

A first caller used by a visitor for a call; a second caller used by a person who responds to the visitor for a call; and an imaging device having an imaging range in the vicinity of the first caller; A voice is transmitted between the first telephone and the second telephone, and an image captured by the imaging device is transmitted to the second telephone and the second telephone An intercom system displayed on the machine,
The first caller receives a call operation of the visitor and transmits a call signal to the second caller, and obtains a voice uttered by the visitor and sends it to the second caller. A communication means for transmitting and ringing the voice transmitted from the second telephone and listening to the visitor,
The imaging apparatus includes an imaging unit that captures a moving image, and a transmission unit that transmits a moving image captured by the imaging unit to the second telephone.
The second telephone has a ringing means for ringing a ringing tone when receiving the call signal, and obtains a voice uttered by the attendant and transmits the voice to the first telephone. Call means for ringing the voice transmitted from the machine and listening to the responder; display means for displaying the moving image transmitted from the transmission means; and accepting means for receiving at least the response operation of the responder; And a control means for displaying the moving image transmitted from the imaging device on the display means,
The interphone system, wherein the control means repeatedly displays a short-time moving image transmitted from the imaging device on the display means.   The imaging apparatus includes a storage unit that stores a short-time moving image captured by the imaging unit, and the transmission unit of the imaging apparatus repeats the short-time moving image stored in the storage unit. 2. The intercom system according to claim 1, wherein the intercom system is transmitted to a second telephone. The transmission unit of the imaging apparatus is a moving image in which one of a short-time moving image stored in the storage unit and a real-time moving image captured by the imaging unit is a parent screen and the other is a child screen. Transmitting the image to the second intercom,
The control unit of the second call device displays the moving image transmitted from the imaging device on the display unit, and switches the parent screen and the child screen according to an operation input received by the receiving unit. To the imaging device,
The transmission unit of the imaging apparatus transmits a moving image obtained by switching the moving image of the parent screen and the moving image of the child screen to the second telephone according to the instruction. Intercom system. The transmission unit of the imaging device transmits a short-time moving image stored in the storage unit and a real-time moving image captured by the imaging unit to the second telephone.
The control means of the second caller displays one of the short-time moving image and the real-time moving image on the main screen of the display means and displays the other moving image of the display means. The intercom system according to claim 1 or 2, wherein the moving images displayed on the child screen and further displayed on the parent screen and the child screen are exchanged according to an operation input received by the receiving unit.   4. The display unit of the second telephone, wherein a part of the short-time moving image is displayed as a still image in response to an operation input received by the receiving unit. The intercom system according to claim 1.   5. The display unit of the second telephone, wherein the short-time moving image is displayed at intervals of one to a plurality of frames according to an operation input received by the receiving unit. The intercom system according to any one of the above.   The imaging unit of the imaging apparatus starts imaging of the short-time moving image when a calling operation is received by the calling unit of the first telephone. The intercom system according to item 1.   Human detection means for detecting the presence of a person within a detection range including the vicinity of the first telephone, and the image pickup means of the image pickup device is configured to detect the short time at a timing according to a detection result of the person detection means. The intercom system according to any one of claims 1 to 5, wherein imaging of a moving image is started.   The imaging unit of the imaging apparatus starts capturing the short-time moving image at a timing from when the presence of a person is detected by the human detection unit to when a calling operation is received by the calling unit of the first telephone. The intercom system according to claim 7, wherein:   The intercom system according to claim 7, wherein the imaging unit of the imaging apparatus starts imaging the short-time moving image at a timing when the presence of a person is detected by the human detection unit.   The imaging unit of the imaging apparatus always captures a moving image and stores it in the storage unit, and the transmission unit has a timing that is a predetermined time later than the timing at which the presence of a person is detected by the human detection unit. 8. The intercom system according to claim 7, wherein the moving image picked up in step (b) is read from the storage means and transmitted to the second telephone.   The intercom system according to claim 7, wherein the human detection unit detects the presence of a person by performing image processing on a captured image obtained by imaging the detection range.   The storage unit of the imaging apparatus stores only frames other than at least the frame in which the visitor is not shown among frames captured by the imaging unit. The intercom system according to item 1.   The transmission unit of the imaging apparatus supplements the portion of the frame that is not stored in the short-time moving image stored in the storage unit with the other frame stored in the second call. 13. The intercom system according to claim 12, wherein the intercom system is transmitted to a machine.

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