JP2011205308A - Intercom system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intercom system which effectively uses a memory without storing unnecessary images.SOLUTION: The intercom system has an entrance image storage part 31b which stores an image captured when called from an entrance device, a door phone image storage part 31a which stores an image captured when called from a door phone, a face authentication part 33 which determines whether the images are identified with the same person, based on the recorded image stored in the entrance image storage part 31b and the recorded image stored in the door phone image storage part 31a, and an image deletion part 35 which deletes the image stored in the door phone image storage part 31a when the face authentication part 33 determines that the images are identified with the same person.

Description

  The present invention relates to an intercom system installed in an apartment house, and more specifically, an entrance machine installed in an entrance hall, a doorphone installed in an entrance of each dwelling unit, and a housing information board installed in each dwelling unit It is related with the intercom system provided with.

The intercom system provided in apartment houses such as apartments is composed of a housing information board installed in each dwelling unit, a master unit installed in the manager's room, and a collective entrance machine installed in the collective entrance. It is a system that allows intercom calls between other devices.
In addition, doorphones installed at the front doors of each dwelling unit are connected to the house information board, and interphone calls can be made between them.

In such an intercom system for a collective housing, a visitor calls a housing information panel of each dwelling unit from a collective entrance machine or a door phone, and performs an interphone call with a resident in the dwelling unit. And when the housing information board of each dwelling unit is called from a collective entrance machine or a door phone, a visitor can be imaged and the picture can be recorded on the housing information board side.
As such an intercom system for an apartment house, there are, for example, “apartment house intercom system” disclosed in Patent Document 1 and “house information system” disclosed in Patent Document 2.

In an intercom system having a function of recording a video image of a visitor, the video image is stored in the memory of the house information board, but the image information requires a large storage capacity, while the storage capacity of the memory is limited. Since the amount is fixed, there is a demand for erasing unnecessary images from the viewpoint of effective use of memory.
In this regard, in Patent Document 2, a measure is taken to erase the image stored in the memory after a predetermined time has elapsed, or to overwrite the image when the remaining storage capacity of the memory is reduced.

JP 2007-228285 A JP 2002-111183 A

  However, as disclosed in Patent Document 2, for example, an image stored in the memory is erased after a predetermined time has elapsed, or is overwritten when the remaining storage capacity of the memory decreases, for example, If you are away for a long period of time, the old image will be deleted, and the image that is originally required may be deleted.

  The present invention has been made to solve such a problem, and it is intended to provide an interphone system capable of effectively using a memory while leaving an originally necessary image and not storing an originally unnecessary image. It is aimed.

In order to solve the above problems, the inventor examined what is originally unnecessary image, and the typical behavior pattern of the visitor is called from the collective entrance, and the collective entrance opened by the resident's response. In this case, there are double images taken with the camera at the entrance door and images taken with the doorphone camera. In such a case, it was considered that one image is an unnecessary image.
Therefore, it has been found that the memory can be effectively used by deleting only such unnecessary images and not storing them.
The present invention is based on such knowledge, and specifically comprises the following configuration.

(1) An intercom system according to the present invention includes a collective entrance machine installed at a collective entrance, a doorphone installed at the entrance of each dwelling unit, and a housing information board installed in each dwelling unit. The home information board includes an image recording unit that records the video of the visitor captured by each device when a visitor calls from the collective entrance machine and the doorphone to the home information board. In the intercom system
Collective entrance image storage unit for storing recorded images captured when there is a call from the collective entrance machine, door phone image storage unit for storing recorded images captured when there is a call from the doorphone, A face authentication unit for determining whether or not both images are images of the same person based on the recorded image stored in the image storage unit for the collective entrance and the recorded image stored in the image storage unit for the intercom; and the face authentication An image erasing unit for erasing one of the recorded images stored in the door phone image storage unit or the collective entrance image storage unit when the unit determines that the images are the same person image. Is.

(2) Further, in the above-described (1), the face authentication unit stores the recorded image stored in the collective entrance image storage unit and the recorded image within a predetermined time from when the recorded image is stored. It is characterized in that it is determined whether or not both images are images of the same person based on the recorded image of the door phone image storage unit.

(3) Moreover, the intercom system which concerns on this invention is provided with the collective entrance machine installed in the collective entrance, the door phone installed in the entrance of each dwelling unit, and the housing information board installed in each dwelling unit. An image recording unit configured to record an image of the visitor captured by each device when a visitor calls from the collective entrance machine and the doorphone to the house information board, the house information board In the intercom system provided by
A collective entrance image storage unit for storing a recorded image captured when a call is made from the collective entrance machine, a door phone image storage unit for storing a recorded image captured when a call is made from the doorphone, It is determined whether there is a recorded image stored in the collective entrance image storage unit within a predetermined time from the time stored in the door phone image storage unit, and if there is a recorded image, the doorphone recorded most recently And an image erasing unit for erasing one of the recorded images stored in the image storage unit for the collective entrance stored within the predetermined time.

  According to the present invention, it is possible to delete unnecessary image data when originally unnecessary image data exists, such as when a visitor is imaged by both the camera of the entrance hall and the camera of the door phone. Therefore, unnecessary data can be deleted and necessary data can be left, and the memory can be effectively used.

It is a block diagram of a door phone and a house information board used for an intercom system according to an embodiment of the present invention. It is a flowchart explaining operation | movement of the intercom system which concerns on one embodiment of this invention. It is explanatory drawing explaining the whole structure of the intercom system which concerns on one embodiment of this invention.

An intercom system 1 according to an embodiment of the present invention will be described with reference to FIGS.
First, the overall configuration of the system will be described with reference to FIG. The intercom system 1 according to the present embodiment includes a housing information board 3 installed in each dwelling unit, a management room base unit 5 installed in a manager's room, and a collective entrance machine 7 installed in the collective entrance. Are connected by a control signal line, a call line (voice line) and a video line via the control device 9 so that an interphone call can be made.
The house information board 3 is connected to a door phone 11 installed at the entrance of each dwelling unit so that intercom calls can be made between them.

Next, the house information panel 3 and the door phone 11 will be described with reference to FIG.
As shown in FIG. 1, the door phone 11 is connected to the house information board 3 through the video line L1 and the telephone line L2.
The door phone 11 also includes a camera 13 that images a visitor, and a modulation circuit 15 that modulates a video signal from the camera 13 and outputs the modulated video signal to the house information board 3 via the video line L1. Further, a call button 17 pressed by the visitor, a call circuit 19 for converting the operation of the call button 17 into an electric signal, and a call circuit 21 having a speaker and a microphone (not shown) and outputting a voice signal via the call line L2. I have.

The house information board 3 is connected to the door phone 11 via the video line L1 and the call line L2, and is connected to the control device 9 via the control signal line, the video line and the call line.
In addition, the house information board 3 includes a demodulation circuit 23, a power supply circuit 25, an image recording unit 27 having a timer function, an image reproduction unit 29, a storage unit 31, a face authentication unit 33, an image erasing unit 35, a monitor 37, a call A detection circuit 39, a call switching circuit 41, a call circuit 47 having a microphone 43 and a speaker 45, a transmission / reception unit 49, a video switching circuit 51, and a control unit 53 are provided.
Details of each part will be described below.

<Demodulation circuit>
The demodulation circuit 23 demodulates the video signal modulated by the door phone side modulation circuit 15, and the demodulated video is displayed on the monitor 37.
<Power supply circuit>
The power supply circuit 25 is connected to a commercial power supply (not shown), and supplies power to the doorphone 11 via the video line L1 when the call button 17 of the doorphone 11 is pressed.

<Image recording part>
The image recording unit 27 is connected to the demodulation circuit 23 and records a still image. The image recording unit 27 includes an A / D converter, an image compression circuit, and the like (not shown), and compresses a still image captured by the camera 13 of the door phone 11 or the camera (not shown) of the collective entrance machine 7 using the JPEG method or the like. And stored in the door phone image storage unit 31a or the collective entrance image storage unit 31b of the storage unit 31.
The image recording unit 27 is activated when there is a call from the door phone 11 or the collective entrance 7 and records an image regardless of whether there is a call. Therefore, if there is a call, recording is performed not only when the call is not answered but also when the call is answered at home by raising the handset or pressing the call button.
The video on the door phone 11 side and the video on the collective entrance 7 side are switched by the video switching circuit 51 and recorded by the image recording unit 27.

Recording by the image recording unit 27 is performed at predetermined intervals from when the call is made until a predetermined time elapses. Specifically, an image is recorded every second, for example, for 6 seconds after the call is made. However, since the camera (the camera 13 of the door phone 11 or the camera of the collective entrance machine 7) has not been activated at the same time as the calling operation is performed, for example, after 1 second has elapsed since the calling, the images are sequentially cycled by 1 second. To record a total of 5 images. The five images are collectively handled as one case and stored in the storage unit 31.
The image recording unit 27 has a timer function by a timer 28, and measures time from the time when the call is made. The image recording unit 27 stops recording when 6 seconds elapses according to the time of the timer 28. However, if the call between the visitor and the resident ends before 6 seconds elapse, recording is stopped at that time.
The image recording unit 27 stores the time information of the timer 28 together with the image when recording. As a result, the stored image can be read based on the recorded time.
In addition, the image recording unit 27 stores the plurality of images in the storage unit 31 for each call. When the storage capacity of the storage unit 31 decreases, the image recording unit 27 deletes and overwrites the oldest data to give priority to the latest one. Remember.

<Image playback unit>
The image playback unit 29 includes a D / A converter (not shown), an image expansion circuit, and the like, and a plurality of still images stored in the storage unit 31 in accordance with an operation (playback operation) of a playback button (not shown). Are sequentially reproduced on the monitor 37. Specifically, it is desirable to perform playback in the same state as the recorded timing, and the recorded still image is switched and displayed one screen at a time every second.

<Storage unit>
The storage unit 31 as an image storage unit is configured by a flash memory or the like, and a storage unit having a capacity capable of recording a plurality of images, for example, about 20 images is used.
The storage unit 31 includes a door phone image storage unit 31 a that stores images captured by the camera 13 of the door phone 11, and a collective entrance image storage unit 31 b that stores images captured by the camera of the collective entrance machine 7. ing.

<Face authentication unit>
The face authentication unit 33 determines whether or not they are the same person based on the visitor images stored in the door phone image storage unit 31a and the collective entrance image storage unit 31b.
Specifically, after the video from the camera at the entrance hall is recorded, if the video from the camera 13 of the door phone 11 is recorded within a predetermined time, these images are read out and the images are known as face recognition. The system determines whether or not the same person. When it is determined that they are the same person, the information is notified to the image erasure unit 35.
The door phone image storage unit 31a and the collective entrance image storage unit 31b store a plurality of still images as images at the time of the visit. One image may be read out and subjected to face authentication, or a plurality of images may be targeted. The face authentication unit 33 is an example of a duplicate image determination unit that determines whether there are duplicate images of the same person in the recorded images stored in the image storage unit.

<Image eraser>
The image erasure unit 35, when the face authentication unit 33 determines that the person is the same person, of the images that are the authentication target of the face authentication unit 33, the image stored in the doorphone image storage unit 31a, or Any one of the images stored in the image storage unit 31b for the collective entrance is deleted. That is, when it is determined that there are duplicate images by the same person, the duplicate images are deleted from the recorded images stored in the image storage unit.

<Monitor>
The monitor 37 is connected to the demodulation circuit 23, the image reproduction unit 29, and the video switching circuit 51, and the image captured by the camera 13 of the door phone 11, the image captured by the camera of the collective entrance machine 7, or image reproduction. The unit 29 displays the video read from the storage unit 31.
When there is a call from the door phone 11 or the collective entrance machine 7, the monitor 37 displays an image captured by the camera that has been called. When a playback button (not shown) is operated, an image stored in the storage unit 31 is displayed. The video switching on the monitor 37 is performed by the video switching circuit 51.

<Call detection circuit>
The call detection circuit 39 is a circuit that detects that the call button 17 of the door phone 11 has been pressed.

<Call switching circuit>
The call switching circuit 41 is connected to the call circuit 21 of the door phone 11 and a call line, and switches between the door phone 11 and the collective entrance machine 7 as a party to call on the house information board 3. For example, when the call button 17 of the door phone 11 is pressed and detected by the call detection circuit 39, the call line L2 on the door phone 11 side and the call circuit 47 in the house information board 3 are connected to each other. Enable phone calls. On the other hand, when the call button of the collective entrance machine 7 is pressed and detected by the transmission / reception unit 49, the call line (voice line) connected to the control device 9 and the call circuit in the house information panel 3. 47 is connected to enable communication with the collective entrance 7 side.

<Call circuit>
Similarly to the call circuit 21 of the door phone 11, the call circuit 47 is connected to the microphone 43 and the speaker 45, and outputs a ringing tone and voice from the speaker 45 and inputs voice through the microphone 43.
<Transmitter / receiver>
The transmission / reception unit 49 is connected to the control signal line, and transmits / receives a control signal between the control unit 53 and the control device 9. The calling signal from the collective entrance machine 7 is transmitted via the control signal line and received by the transmission / reception unit 49.

<Video switching circuit>
The video switching circuit 51 is connected to the video line via the video adapter 55 and is also connected to the monitor 37 and the image recording unit 27 so that an image displayed on the monitor 37 and an image recorded by the image recording unit 27 are intercom. Switch between the 11 side and the entrance hall 7 side. For example, when there is a call from the doorphone 11, the image captured by the camera 13 of the doorphone 11 is displayed on the monitor 37 and the image captured by the camera 13 of the doorphone 11 is recorded by the image recording unit 27. Switch the image signal flow to. On the other hand, when there is a call from the collective entrance machine 7, an image captured by the camera of the collective entrance apparatus 7 is displayed on the monitor 37 and an image captured by the collective entrance camera is recorded by the image recording unit 27. The flow of the image signal is switched as described above.

<Control unit>
The control unit 53 is configured by an MPU or the like, and is connected to a configuration unit (for example, the transmission / reception unit 49) having each function in the house information panel 3, and exchanges signal commands with each configuration unit. Control.

  Although not shown in the figure, the collective entrance machine 7 is similar to the door phone 11, and modulates the video signal of the camera that images the visitor and the camera and outputs it to the housing information board 3 side via the control device 9 and the video line. A modulation circuit, a call button pressed by a visitor, a call circuit that converts the operation of the call button into an electric signal, a call circuit that has a speaker and a microphone, and outputs a voice signal via the control device 9 and a call line, and a call button A transmission / reception unit is provided that outputs a call signal when pressed.

  Next, the operation of the intercom system 1 according to the present embodiment configured as described above will be described focusing on the image processing of the house information board 3 based on the flowchart shown in FIG. In the following, from the viewpoint of making the explanation easy to understand, explanation will be made separately for each visitor's behavior pattern.

[First pattern]
The first pattern is a typical behavior pattern of a visitor. When calling from the collective entrance, passing through the collective entrance door opened by the resident's response, calling again with the doorphone 11 of the target residence It is.
It is determined whether or not there is a call signal, that is, whether or not the call signal is detected by the call detection circuit 39 or the transmission / reception unit 49 (S1). Since this first pattern is when there is a call signal, since there was a call signal in the determination of S1, it is determined whether the call signal is a call from the central entrance machine 7 or a call from the door phone 11. (S3).
If it is determined in S3 that it is the collective entrance machine 7, the image recording unit 27 starts recording (S5). The recording time at this time is a maximum of several seconds. If the call ends before the set number of seconds elapses, the recording ends at that time.
The recorded image is stored in the collective entrance image storage unit 31b together with the time information read from the timer 28 (S7).

When the automatic door at the entrance is unlocked and opened by the resident's operation, the visitor goes to the visited residence unit and presses the call button 17 on the doorphone 11. At this time, the house information board 3 determines that there is a call signal (S1), and further determines that the call is a call from the door phone 11 (S3).
If it is determined in S3 that the call is from the intercom 11, the image recording unit 27 starts recording (S9). The recording time at this time is set to several seconds at the maximum as in the case of the collective entrance machine 7, and if the call ends before the set number of seconds elapses, the recording ends at that time.
The recorded image is stored in the door phone image storage unit 31a together with the time information read from the timer 28 (S11).

  When the image is stored in the door phone image storage unit 31a, the face authentication unit 33 determines whether an image recorded within, for example, 10 minutes from the current time is in the collective entrance image storage unit 31b (S13). ). Here, the value “within 10 minutes” is a value set based on the time required to go from the collective entrance to the dwelling unit. In the case of this pattern, the visitor has passed the collective entrance, and the image is in the collective entrance image storage unit 31b. In this case, the face authentication unit 33 is stored in the collective entrance image storage unit 31b. The stored image and the image stored in the door phone image storage unit 31a are read, and face authentication is performed based on the read image (S15). In the face authentication of the face authentication unit 33, it is determined whether the image captured by the door phone 11 immediately before and the image captured by the collective entrance within 10 minutes belong to the same person (S17). If it is determined, the image erasing unit 35 erases the image stored in the door phone image storage unit 31a or the collective entrance image storage unit 31b (S19).

[Second pattern]
A visitor calls at the entrance hall 7 but the resident is away.
In this case, the process proceeds from S1 to S7, and after that, it is determined that there is no call signal in the determination of S1, and a standby state is entered. In this case, an image captured by the camera of the collective entrance machine 7 is only stored in the collective entrance image storage unit 31b.

[Third pattern]
When a visitor visits another dwelling unit in the same housing complex and then visits the dwelling unit directly without leaving the housing complex, that is, there is a call from the intercom 11 first without calling from the collective entrance machine 7. Is the case.
In this case, the process proceeds from S1 to S11, and it is determined in S13 that there is no image recorded in the collective entrance image storage unit 31b within 10 minutes, and the image stored in the doorphone image storage unit 31a is deleted. The process ends without waiting.

  As described above, according to the present embodiment, the images of the same person overlap as if the visitor was imaged within a predetermined time by both the camera of the collective entrance 7 and the camera 13 of the door phone 11, When unnecessary image data exists, unnecessary image data is erased, so that unnecessary data can be deleted to effectively use the memory.

  In the above embodiment, 10 minutes is given as an example of the predetermined time in the determination in S13. However, it is preferable that this time can be appropriately changed according to the situation. For example, set longer for dwelling units that are large apartments that are far away from the entrance, and conversely for smaller apartments or units that are close to the entrance. It is also possible to do.

In the above embodiment, in the determination of S13, it is determined whether there is an image recorded within a predetermined time, and an image existing within the predetermined time is set as a target for face authentication. In particular, all of the images stored in the storage unit 31 may be subject to face authentication determination without adding time information.
In addition, when recording is performed with the doorphone 11, a recorded image stored in the collective entrance image storage unit 31b may be compared with an image recorded immediately before by face authentication. In this way, it is not necessary to determine whether the timer 28 is within 10 minutes.

When the face authentication unit determines that there are duplicate images from the same person, the image recorded in any of the storage units, the image storage unit for the entrance door, the image storage unit for the door phone may be deleted. However, it may be as follows. When the two storage units are configured by different memories, the storage unit having no memory may be preferentially deleted depending on the remaining memory capacity.
In the present invention, the image storage unit is provided in the house information board, but the image storage unit may be provided in the collective entrance machine, the control device, or the management room base unit. In addition, the image storage unit has been described as including a collective entrance and a doorphone, but it is not necessary to physically provide two of them. You may make it add to the memory | storage part by adding the identification information which can identify whether it is the image imaged with the doorstep or the image captured with the collective entrance machine.

  Moreover, in the above example, when there is an overlapped image between the image captured by the collective entrance machine and the image captured by the door phone, either one is deleted. When there are overlapping images of the same person in the captured recording images, the overlapping images may be deleted from the recorded images stored in the image storage unit. In this case, when the recorded image is stored in the storage unit, it is not necessary to store where, that is, the image captured by the collective entrance or the door phone.

Further, the face authentication unit is used as an example of the duplicate image determination unit that determines whether or not there are duplicate images by the same person in the recorded images stored in the image storage unit. Means may be used.
As described in the embodiment, when a visitor visits a dwelling unit in a collective housing, the visitor's video is captured once at the collective entrance, and then within a few minutes, at the entrance of the dwelling unit. Become. Therefore, when there is a call from the central entrance and within a predetermined time (several minutes), a call is made from the door phone, it is determined that there are duplicate images from the same person in the image storage unit, and face authentication is performed. You may make it erase | eliminate the newest image imaged with the door phone, without performing. In this case, the timer for measuring the predetermined time and the control unit are examples of the duplicate image determination unit.
In addition, without worrying about the visit history in particular, only the recorded images at the most recent visit date and time are stored in the image storage unit, so that the duplicate recorded images by the same person one week ago May be deleted.
The intercom system according to such an invention is configured to include a collective entrance machine installed at the collective entrance, a doorphone installed at the entrance of each dwelling unit, and a housing information board installed in each dwelling unit, In the intercom system comprising an image recording unit for recording the video of the visitor imaged by each device when there is a visitor's call from the collective entrance machine and the doorphone to the housing information board, An image storage unit that stores a recorded image captured when there is a call from the collective entrance machine or the door phone, and whether or not there are duplicate images by the same person in the recorded image stored in the image storage unit A duplicate image determination unit to be determined, and a recorded image stored in the image storage unit when the overlap image determination unit determines that there is a duplicate image by the same person It is characterized in that it comprises an image erasing unit for erasing the duplicated images from within.

In the embodiment described above, unnecessary image data is specified by determining whether or not the person imaged within the predetermined time by the face authentication unit 33 is the same person.
However, in the typical behavior pattern of a visitor, after being imaged by the camera of the entrance hall, the image is captured by the door phone camera within the expected time, so in S13 of the flowchart shown in FIG. If there is an image captured within a predetermined time from the current time in the determination, the image captured by the door phone or the image captured by the collective entrance may be deleted without performing face authentication.
The invention relating to the intercom system in this case has the following configuration.

The intercom system according to such an invention is configured to include a collective entrance machine installed at the collective entrance, a doorphone installed at the entrance of each dwelling unit, and a housing information board installed in each dwelling unit, The home information board includes an image recording unit that records the video of the visitor imaged by each device when a visitor calls from the collective entrance machine and the door phone to the home information board. In the intercom system
A collective entrance image storage unit for storing a recorded image captured when a call is made from the collective entrance machine, a door phone image storage unit for storing a recorded image captured when a call is made from the doorphone, It is determined whether there is a recorded image stored in the collective entrance image storage unit within a predetermined time from the time stored in the door phone image storage unit, and if there is a recorded image, the doorphone recorded most recently And an image erasing unit for erasing one of the recorded images stored in the image storage unit for the collective entrance stored within the predetermined time.

DESCRIPTION OF SYMBOLS 1 Intercom system 3 Residential information board 5 Control room main unit 7 Collective entrance machine 9 Control apparatus 11 Door phone 13 Camera 15 Modulation circuit 17 Call button 19 Call circuit 21 Call circuit 23 Demodulation circuit 25 Power supply circuit 27 Image recording part 29 Image reproduction part Reference Signs List 31 Storage Unit 31a Doorphone Image Storage Unit 31b Collective Entrance Machine Image Storage Unit 33 Face Authentication Unit 35 Image Erasing Unit 37 Monitor 39 Call Detection Circuit 41 Call Switch Circuit 43 Microphone 45 Speaker 47 Call Circuit 49 Transmit / Receive Unit 51 Video Switch Circuit 53 Control unit 55 Video adapter

Claims (4)

  A collective entrance machine installed at the collective entrance, a doorphone installed at the entrance of each dwelling unit, and a housing information panel installed in each dwelling unit, and the housing from the collective entrance machine and the doorphone In an interphone system comprising an image recording unit for recording a video of the visitor imaged by each device when a visitor calls to the information board, the call is made from the collective entrance machine or the door phone. An image storage unit that stores a recorded image captured at a certain time, a duplicate image determination unit that determines whether or not there are duplicate images of the same person in the recorded image stored in the image storage unit, and the overlap An image erasure unit is provided for erasing the duplicated image from the recorded images stored in the image storage unit when the image determination unit determines that there is a duplicate image by the same person. Intercom system, characterized in that the. A collective entrance machine installed at the collective entrance, a doorphone installed at the entrance of each dwelling unit, and a housing information panel installed in each dwelling unit, and the housing from the collective entrance machine and the doorphone In the intercom system in which the housing information board includes an image recording unit that records the video of the visitor imaged by each device when there is a visitor call to the information board,
Collective entrance image storage unit for storing recorded images captured when there is a call from the collective entrance machine, door phone image storage unit for storing recorded images captured when there is a call from the doorphone, A face authentication unit for determining whether or not both images are images of the same person based on the recorded image stored in the image storage unit for the collective entrance and the recorded image stored in the image storage unit for the intercom; and the face authentication An image erasing unit for erasing one of the recorded images stored in the door phone image storage unit or the collective entrance image storage unit when the unit determines that the images are the same person image. Intercom system.   The face authentication unit is configured to record both the recorded image stored in the collective entrance image storage unit and the recorded image of the door phone image storage unit stored within a predetermined time from when the recorded image is stored. The intercom system according to claim 2, wherein it is determined whether the images are images of the same person. A collective entrance machine installed at the collective entrance, a doorphone installed at the entrance of each dwelling unit, and a housing information panel installed in each dwelling unit, and the housing from the collective entrance machine and the doorphone In the intercom system in which the housing information board includes an image recording unit that records the video of the visitor imaged by each device when there is a visitor call to the information board,
A collective entrance image storage unit for storing a recorded image captured when a call is made from the collective entrance machine, a door phone image storage unit for storing a recorded image captured when a call is made from the doorphone, It is determined whether there is a recorded image stored in the collective entrance image storage unit within a predetermined time from the time stored in the door phone image storage unit, and if there is a recorded image, the doorphone recorded most recently An interphone system comprising: an image erasing unit for erasing one of the recorded images stored in the image storage unit for use or the image storage unit for the entrance hall stored within the predetermined time.

Images