JP5275786B2 - Intercom device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce work burden in a living-room master unit of an intercom apparatus. <P>SOLUTION: In an entrance slave unit 10 with a camera of an intercom apparatus 1, image data captured by a camera 101 are modified into a first image size for display on a monitor 204 of a living-room master unit 20 and a second image size for use for another purpose such as display on a wireless terminal 30, and the image data are variably scaled in such a way that the second image size becomes smaller than or equal to a predetermined data size. According to the intercom apparatus 1, compressed image data in a plurality of image sizes are generated by the entrance slave unit 10 with the camera, so that it becomes unnecessary to package a circuit such as a buffer or encoder, which is required for re-processing the compressed image data, in the living-room master unit 20, thereby a burden on the living-room master unit 20 can be reduced. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an intercom apparatus including a camera-equipped entrance slave unit and a living room master unit.

Conventionally, an intercom device 61 having a configuration as shown in FIG. 4 is known. This intercom device 61 includes an entrance slave device 70 with a camera and a room master device 80 that can receive a video signal transmitted from the entrance slave device 70 with a camera and project the received video signal on a monitor. Yes.
The entrance slave device 70 with a camera is used to call a resident and is mainly installed at the entrance of a dwelling unit. The room master unit 80 is used to respond to calls from the camera-equipped slave unit 70 and is installed in the dwelling unit. The camera-equipped entrance slave unit 70 and the room master unit 80 are connected via a transmission line 100. In addition, the room master unit 80 is further connected to a wireless terminal 90 on which an image from the entrance slave unit with camera 70 is wirelessly transmitted from the room master unit 80 and displayed. The wireless terminal 90 can be carried by a resident and can respond to calls from the camera-equipped entrance slave device 70.

JP 2004-260390 A JP 2001-128157 A

  The intercom device with camera 70 of the intercom device 61 includes a camera 701 that images a visitor, a JPEG encoder 702 that compresses a digital video signal output from the camera 701, and JPEG data compressed by the JPEG encoder 702. Is transmitted to the living room base unit 80.

  The room master unit 80 of the intercom device 61 includes a transmission unit 801 for receiving the JPEG data transmitted from the transmission unit 703 of the camera-equipped entrance slave unit 70, a JPEG decoder 802 for decompressing the received JPEG data, A monitor 803 for displaying an image of the digital video signal expanded by the JPEG decoder 802, a JPEG encoder 804 for compressing the digital video signal expanded by the JPEG decoder 802, and the JPEG data compressed by the JPEG encoder 804 as a wireless terminal 90, a wireless module 805 for wireless transmission.

  The wireless terminal 90 includes a wireless module 901 that receives JPEG data wirelessly transmitted from the room master unit 80, a JPEG decoder 902 that decompresses JPEG data received by the wireless module 901, and digital video decoded by the JPEG decoder 902. And a monitor 903 for displaying signals.

In the interphone device 61 as described above, the digital video signal imaged and generated by the camera 701 of the camera-equipped entrance unit 70 is compressed by the JPEG encoder 702 to become compressed image data, that is, JPEG data. The data is transmitted from the transmission unit 703 of 70 through the transmission line 100 to the transmission unit 801 of the office master unit 80.
The JPEG data transmitted to the room master unit 80 is input from the transmission unit 801 to the JPEG decoder 802 and decompressed into a digital video signal. The image of the digital video signal is input to the monitor 803 and displayed.
The expanded digital video signal is compressed into JPEG data by the JPEG encoder 804 and wirelessly transmitted from the wireless module 805 to the wireless terminal 90.
The JPEG data wirelessly transmitted from the wireless module 805 of the office master 80 to the wireless module 901 of the wireless terminal 90 is decompressed by the JPEG decoder 902, and the decompressed image data is input to the monitor 903 and displayed.

  In the intercom apparatus 61 having such a configuration, the image data to be displayed on the monitor 803 and other image data such as image data for transmission and image data for recording to be transmitted to the wireless terminal 90 in the room master unit 80. Are generated at the same time, after the compressed image data (JPEG data) is once expanded, the display size of the monitor 803 of the living room master unit 80, the display size of the monitor 903 of the wireless terminal 90, etc. After the conversion, it is necessary to perform an operation of compressing the image data for transmission in order to wirelessly transmit the image data to the wireless terminal 90. For this reason, hardware or software for performing this operation is required. In addition, since the image once deteriorated due to compression is compressed again, the image quality is greatly deteriorated.

  It is an object of the present invention to reduce the work burden on the intercom unit's office master unit that compresses image data for transmission after image size conversion, and to reduce image quality degradation of the image data. It is.

  In order to solve this problem, the present inventor proposes the following intercom apparatus.

The intercom device according to the present application is provided with a camera for capturing a visitor and a function of calling a resident, a monitor with a camera and a monitor for displaying an image captured by the camera, and a call from the camera with a camera. It is an intercom apparatus having a living room master unit having a function of responding.
Unlike the first image size, which is a predetermined image size for displaying the image data captured by the camera on the monitor of the living room base unit, the entrance slave unit with a camera of the intercom device is wireless. An image size changing unit for changing to at least one Nth image size (N is an integer of 2 or more) for use in other applications such as display on a terminal, and the image size changing unit changing the image size A data compression unit for compressing the first image size data and the Nth image size data, and predetermined information in the first image size data and the Nth image size data compressed by the data compression unit A header adding unit for adding a header including the first image size data or a header with a header to which the header is given by the header giving unit; And the slave device side output destination switching unit for outputting the data of the N image size to a plurality of different output destination, whether the data size of the data of the N image size with the header is in the range of a predetermined data size and determining the data size determining section, more determination of the data size determination unit, when the data of the N image size with the header is not within the predetermined data size, changing the compression ratio in the data compression unit And a compression ratio control unit that inputs data of the Nth image size with the header that is not within the predetermined data size range to the data compression unit, data of the first image size with the header , and the data The N-th image size data with the header determined to be within a predetermined data size range by the size determination unit is arranged in a predetermined order. Serial and possess the image data transmission unit to be transmitted to the room master station, the room master station, based on the header of the image data received from the camera entrance door station, received from the camera entrance door station And a master-side output destination switching unit that switches the output destination of the image data .
In this intercom device, compressed image data of a plurality of image sizes is generated by the camera-equipped entrance slave unit. Therefore, circuits such as a buffer and an encoder necessary for processing the compressed image data again are provided. It is no longer necessary to install in the home, and the burden on the parent unit can be reduced.
Further, the intercom apparatus includes a compression rate control unit that changes a compression rate in the data compression unit for data of the Nth image size, and a data size of the Nth image size data compressed by the data compression unit is predetermined data. Since it has a data size determination unit that determines whether the size is equal to or smaller than the size, the data size of the Nth image size can be set to be equal to or smaller than a predetermined data size and transmitted to the room master unit. For example, if the predetermined data size is set to the maximum value that can be transmitted to the wireless terminal, the data can be generated again in the living room master unit to generate the transmission data. Data need not be compressed, and degradation of image quality displayed on the wireless terminal can be minimized. Further, if the Nth image data is used as recording data in the room master unit, the memory capacity can be used effectively.
In addition, the camera-captured video can be displayed as a moving image on the monitor of the living room master unit as in the conventional case.

  The image size changing unit of the intercom device may be changed to the first image size and at least one Nth image size. That is, the image size changing unit only needs to change to two or more image sizes, and can change the image size to a number corresponding to the type of application to be used.

The image data transmission unit may transmit the N-th image size data with the header at least in two.
If the N-th image size data with the header is transmitted at least in half , the N-th image size data with the header has a data amount per image larger than the first image size data. A large amount of data can be obtained, and a fine image can be transmitted to the parent unit.

The image data transmission unit, for each vertical synchronization signal the camera output, to transmit data of the first N image size with the data and the header of the first image size with the header in a predetermined order can do.
For example, when it is changed to the data of the two image size by the image size changing section, it may be adapted to transmit the data of the second image size of the data with the header of the first image size with header alternately . Further, when it is changed to the data of the three image size by the image size changing section, of the first image size with the header data, the second image size data with the header, the third image size of the data with the header, The first image size data with a header can be repeatedly transmitted such as.
The image data transmitting unit is also a case where the image size changing unit changes the data to two image sizes, and the image data transmitting unit transmits the second image size data with a header in two parts. In this case, for example, the first image size data with the header, the one data obtained by dividing the second image size data with the header into two parts , the first image size data with the header , the header attached The other data obtained by dividing the second image size data into two parts , the first image size data with a header, and so on can be repeatedly transmitted.

  According to the present invention, it is possible to reduce the work load on the living room master unit of the interphone device that compresses image data for transmission after image size conversion, and to reduce image quality degradation of the image data.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

The intercom apparatus 1 according to this embodiment is schematically configured as shown in FIG. The intercom apparatus 1 includes an entrance slave unit 10 with a camera, a living room master unit 20 that receives a video signal transmitted from the entrance slave unit 10 with a camera, and displays the received video signal on a monitor, and an entrance with a camera. It includes a wireless terminal 30 on which an image from the child device 10 is displayed by wireless transmission from the living room parent device 20.
The entrance unit 10 with a camera is used to call a resident and is mainly installed at the entrance of a dwelling unit. The room master 20 is used for responding to calls from the camera-equipped entrance slave 10 and is installed in the dwelling unit. The camera-equipped entrance slave unit 10 and the living room master unit 20 are connected via a transmission line 40. The wireless terminal 30 can be carried by a resident and can respond to calls from the camera-equipped entrance cordless handset 10, and is appropriately used at an appropriate location in the dwelling unit.

  Hereinafter, the configuration of the entrance slave device with camera 10, the parent room 20, and the wireless terminal 30 will be described. First, the configuration of the camera-equipped entrance slave unit 10 will be described.

  The camera-equipped handset 10 includes a camera 101 that images a visitor, a prescaler 102, a JPEG encoder 103, a quantization table 104, a scaler 105, a timing generation unit 106, a header assignment unit 107, and a multiplexer 108. A data size determination unit 109, a buffer 110, and a transmission unit 111.

The camera 101 images a visitor.
The prescaler 102 scales the digital video signal output from the camera 101 to a predetermined image size. In the prescaler 102 of the present embodiment, two scale values, a first scale value and a second scale value, are set, scaled to the first image size by the first scale value, and the second image size by the second scale value. To be scaled to In the present embodiment, the first image size corresponds to the image size of the monitor in the room master unit 20, and is QVGA. In the present embodiment, the second image size corresponds to the image size of the monitor of the wireless terminal 30 and is VGA.

The JPEG encoder 103 compresses the digital video signal output from the prescaler 102 and encodes it into compressed image data, that is, JPEG data.
The quantization table 104 sets the compression rate of the JPEG encoder 103.
The scaler 105 changes the coefficient of the quantization table 104. In the present embodiment, the compression by the JPEG encoder 103 is performed by using a fixed first screen scale value for the digital video signal of the first image size and a variable second screen scale value for the digital video signal of the second image size. It has come to be.
The timing generation unit 106 outputs a timing signal that is a timing for switching the scale value of the prescaler 102, a timing for switching the compression rate of the JPEG data generated by the JPEG encoder 103, and a timing for switching the output destination of the JPEG data by the multiplexer 108. Is.

The header adding unit 107 adds additional information such as an image size and a quantization condition to the JPEG data output from the JPEG encoder 103.
The multiplexer 108 switches the output destination of the JPEG data with header information output from the header assigning unit 107 based on the timing signal from the timing generation unit 106. In this embodiment, the transmission is the first output destination. JPEG data with header information is output so that the JPEG data with header information of the first image size is output to the unit 111 and the JPEG data with header information of the second image size is output to the data size determination unit 109 as the second output destination. The data output destination is switched alternately.

The data size determination unit 109 determines whether the data size of the JPEG data with header information having the second image size input from the multiplexer 108 is within the reference data size range set in the data size determination unit 109 in advance. It is to determine whether or not.
The buffer 110 is output from the data size determination unit 109 when the data size of the JPEG data with header information input to the data size determination unit 109 is within the size range set by the data size determination unit 109. JPEG data with header information is temporarily stored.
The transmission unit 111 transmits the JPEG data with header information input from the multiplexer 108 and the JPEG data with header information input from the buffer 110 to the living room master unit 20 via the transmission line 40. In the present embodiment, the transmission unit 111 is configured to transmit JPEG data with header information for each vertical synchronization signal output from the camera 101.

The office master 20 includes a transmission unit 201, a multiplexer 202, a JPEG decoder 203, a monitor 204, a recording control unit 205, a recording medium 206, a serial communication unit 207, and a wireless module 208.
The transmission unit 201 receives a signal including JPEG data with header information transmitted from the entrance unit 10 with a camera via the transmission line 40.
The multiplexer 202 switches the output destination of the JPEG data with header information received by the transmission unit 201. Any one of the JPEG decoder 203, the recording control unit 205, and the serial communication unit 207 that outputs the JPEG data with header information as an output destination. To output.
The JPEG decoder 203 decompresses the JPEG data with header information output from the multiplexer 202 and outputs image data.
The monitor 204 displays the image data from the JPEG decoder 203.
The recording control unit 205 performs recording control of JPEG data with header information output from the multiplexer 202.
The recording medium 206 stores JPEG data with header information under the control of the recording control unit 205.
The serial communication unit 207 controls transmission of JPEG data with header information output from the multiplexer 202.
The wireless module 208 is for wirelessly transmitting JPEG data with header information to the wireless terminal 30.

  The wireless terminal 30 receives a signal including header information-added JPEG data wirelessly transmitted from the living room master unit 20, and decompresses the header information-added JPEG data received by the wireless module 301 into a digital video signal. A JPEG decoder 302 for decoding and a monitor 303 for displaying a digital video signal decoded by the JPEG decoder are provided.

  Next, the operation of the intercom device 1 configured as described above will be described. However, since the operation of the intercom apparatus 1 that calls the room base unit 20 from the camera-equipped main unit 10 and the response operation by the room base unit 20 is the same as the conventional one, the description is omitted here. A description will be given centering on the flow of signals output from the camera 101 based on the calling operation of the camera-equipped entrance slave device 10.

A digital video signal S <b> 1 captured and generated by the camera 101 of the entrance slave device with camera 10 is input to the prescaler 102. This digital video signal S1 will be described as outputting image data with a frame rate of 60 fps in this embodiment.
The prescaler 102 scales the image size of the digital video signal S1 based on the first scale value or the second scale value, and outputs the digital video signal S2. Specifically, the digital video signal S2 having the first image size is output by scaling using the first scale value, and the digital video signal S2 having the second image size is output by scaling using the second scale value. The first scale value and the second scale value are switched every time a timing signal is transmitted from the timing generation unit 106.
The output digital video signal S2 is input to the JPEG encoder 103.

Here, the timing generation unit 106 according to the present embodiment outputs a timing signal so that the digital video signal S1 output at 60 frames per second is output to the transmission unit 111, which is the first output destination of the multiplexer 108, every other frame. This timing signal is transmitted to the prescaler 102, the scaler 105, and the multiplexer 108 described above.
The scaler 105 of the present embodiment switches the compression rate for each timing signal and controls the JPEG encoder 103 to perform compression by the JPEG encoder 103 at the compression rate. This compression is performed with a fixed first screen scale value for the digital video signal of the first image size, and with a variable (described later) second screen scale value for the second video size digital video signal.
The JPEG data d1 that is the compressed image data output from the JPEG encoder 103 is input to the header adding unit 107.

  The header attaching unit 107 assigns information used in the JPEG encoder 103, for example, information such as an image size, a quantization table count, a scaling value, and a destination to the JPEG data d1 as a header, and JPEG data with header information is JPEG data. Data d2 is output. The JPEG data d2 is input to the multiplexer 108.

The multiplexer 108 switches the output destination of the JPEG data d2 received from the header adding unit 107 every time a timing signal is input from the timing generation unit 106, and is input to the multiplexer 108 from the header adding unit 107. The JPEG data d2 is output to either the transmission unit 111 serving as the first output destination or the data size determining unit 109 serving as the second output destination. Specifically, JPEG data d3 that is JPEG data with header information of the first image size is output to the transmission unit 111, and JPEG data that is JPEG data with header information of the second image size is output to the data size determination unit 109. It is switched so that d4 is output.
Accordingly, the JPEG data d3 output from the multiplexer 108 to the first output destination is output to the transmission unit 111, and the JPEG data d4 output to the second output destination is output to the transmission unit 111 as it is. Is output to the data size determination unit 109 instead. In the present embodiment, the JPEG data d3 output from the multiplexer 108 to the first output destination and the second output destination are both output at a frame rate of 30 fps.

Hereinafter, the operation of the data size determination unit 109 will be described with reference to the flowchart of FIG.
As described above, of the JPEG data d2 output from the header adding unit 107, the JPEG data of the second image size is input to the data size determination unit 109, which is the second output destination, by switching the multiplexer 108. (ST51).
The data size determination unit 109 compares the data size of the JPEG data d4 input from the multiplexer 108 with a preset data size, and if the data size of the JPEG data d4 is within the set data size range (ST52). : Yes) outputs the JPEG data d5 to the buffer 110 (ST53). At this time, the JPEG data d5 is output to the buffer 110 at a frame rate of 30 fps or less in this embodiment.
On the other hand, when the data size of the JPEG data d4 is outside the set data size range (ST52: No), the output to the buffer 110 is not performed, the setting of the scaler 105 is changed, and the JPEG encoder is changed with a different compression rate. The data compression by 103 is executed again (ST54). The JPEG data d1 output from the JPEG encoder 103 is input again to the data size determination unit 109 via the header assignment unit 107 and the multiplexer 108 (ST51), and the data size determination unit 109 again determines the data size of the JPEG data d4 and the data size. Comparison with a preset data size is performed (ST52).
In this way, when the data size of the JPEG data d4 is outside the preset data size range, variable scaling is performed until the data size of the JPEG data d4 becomes the JPEG data d5 within the set range. It has come to be. In the present embodiment, this variable scaling is performed for each frame of the screen.

The JPEG data d3 output from the multiplexer 108 and the JPEG data d6 in the buffer 110 are input to the transmission unit 111 and transmitted to the room master unit 2 via the transmission line 40.
The transmission unit 111 can be configured to divide the JPEG data d6 in the buffer 110 into at least two parts and transmit the divided data to the room master unit 20. In the present embodiment, the JPEG data d6 is divided into three parts and transmitted to the room master unit 20, and the JPEG data d3 output to the first output destination is transmitted at a frame rate of 30 fps. The JPEG data d6 output to the second output destination is divided into three and transmitted at a frame rate of 10 fps.
Specifically, as shown in FIG. 3, the transmission unit 111 sends JPEG data d3 ((1) in the figure) output to the first output destination and JPEG data d6 (FIG. 3) output to the second output destination. The first JPEG data obtained by dividing (2)) into three parts, the JPEG data d3 output to the first output destination ((1) in the figure), and the JPEG data d6 output to the second output destination (( 2)), the second JPEG data divided into three parts, the JPEG data d3 output to the first output destination ((1) in the figure), and the JPEG data d6 output to the second output destination ((2) in the figure) ) Is divided into the third JPEG data, the JPEG data d3 ((1) in the figure) output to the first output destination, and the JPEG data d6 ((1) in the figure) output to the second output destination. It will be transmitted in the order of the first JPEG data ... There.
As described above, the transmission unit 111 according to the present embodiment divides and transmits the JPEG data d6 output to the second output destination, so that the JPEG data d6 output to the second output destination The data amount per image can be made larger than the JPEG data d3 output to the first output destination, and a fine image can be transmitted to the room master unit 2.

The JPEG data transmitted from the front door 10 to the living room master 20 via the transmission line 40 is received by the transmission unit 201. The JPEG data d7 received by the transmission unit 201 is input to the multiplexer 202.
The multiplexer 202 switches the output destination of the JPEG data received from the transmission unit 201 based on the header information of the input JPEG data d7. The multiplexer 202 switches the JPEG data d7 to the JPEG decoder 203, the recording control unit 205, The JPEG data d7 is output to any of the serial communication units 207. Specifically, JPEG data of the first image size is output to the JPEG decoder 203, and JPEG data of the second image size is output to the recording control unit 205 or the serial communication unit 207.
As a result, the JPEG data d7 is distributed to either the display JPEG data d8, the recording JPEG data d9, or the JPEG data d11 for transmission to the wireless terminal.
In this embodiment, JPEG data d8 for display is output at a frame rate of 30 fps, JPEG data d9 for recording is output at a frame rate of 10 fps, and JPEG data d11 for transmission is output at a frame rate of 10 fps or less. Is done.

  The JPEG data d8 input from the multiplexer 202 to the JPEG decoder 203 is expanded by the JPEG decoder 203, and the image data d9 is output from the JPEG decoder 203. The image data d9 is input to the monitor 204 and displayed.

  The JPEG data d10 input from the multiplexer 202 to the recording control unit 205 is recorded on the recording medium 206.

The JPEG data d11 input from the multiplexer 202 to the serial communication unit 207 is wirelessly transmitted from the wireless module 208 to the wireless terminal 30.
The JPEG data d12 wirelessly transmitted from the wireless module 208 of the living room master unit 20 to the wireless module 301 of the wireless terminal 30 is expanded by the JPEG decoder 302, and the expanded image data d13 is input to the monitor 303 and displayed.

According to the interphone device 1 of the present embodiment as described above, the compressed image data of two types of image sizes are generated by the camera-equipped entrance slave unit 10, so that the compressed image data is processed again. It is not necessary to mount necessary circuits such as buffers and encoders in the room master unit, and the burden on the room master unit 20 can be reduced.
Further, since the scaler 105 and the data size determination unit 109 can transmit the second image size data to the living room master unit 20 with the data size of the second image size equal to or less than a predetermined data size, the second image size data is transmitted to the wireless terminal 30. If it is used as transmission data for transmission, the data size set in advance in the data size determination unit 109 is set to the maximum value that can be transmitted to the wireless terminal 30, so that the transmission data is stored in the room master unit 20. It is not necessary to compress the data again to generate it, and degradation of the image quality displayed on the wireless terminal 30 can be minimized. Further, if this second image data is used as recording data in the room master unit 20, the memory capacity can be used effectively.

In addition, although the prescaler 102 of the slave unit 10 with the camera of the interphone device 1 according to the present embodiment has been described as being changed to two image sizes of the first image size and the second image size, the present invention is not limited to this and is used. In order to change the image size to a number corresponding to the type of application to be performed, the image size may be changed to the first image size and at least one or more Nth image size (N is an integer of 2 or more). it can.
In such a configuration, in order to make the data size of the Nth image size equal to or less than a predetermined size, the data size determination unit 109 of the camera-equipped slave unit 10 has N−1 types of reference data sizes set. May be.
For example, when the prescaler 102 is configured to change the image size to three types of the first image size, the second image size, and the third image size, the data size determination unit 109 receives the reference data Two types of sizes, a first data size and a second data size, are set. In this case, the data size determination unit 109 compares the data size of the JPEG data d4 with either the first data size or the second data size based on the header of the JPEG data d4 input from the multiplexer 108, and the JPEG data d4 When the data size is within the set first data size or second data size, this JPEG data is output to the buffer 110. On the other hand, when the data size of the JPEG data d4 is out of the set data size range, as described above, variable scaling is performed until the JPEG data d4 becomes the JPEG data d4 within the set range. Done.

Further, the multiplexer 202 of the living room master unit 20 of the intercom apparatus 1 according to the present embodiment outputs the JPEG data d7 from the transmission unit 201 to any of the JPEG decoder 203, the recording control unit 205, or the serial communication unit 207. However, the present invention is not limited to this, and may be output to one or more other output destinations. For example, the JPEG data d7 can be distributed from the multiplexer 202 to the Ethernet (registered trademark). The JPEG data distributed to the Ethernet (registered trademark) may be input to the server via, for example, a hub.
In this embodiment, an example in which JPEG data is generated as compressed image data has been described. However, the present invention is not limited to this, and data in other formats may be used.

The figure which shows the whole structure of the intercom apparatus of this embodiment. The flowchart which shows operation | movement of the data size determination part of the subunit | mobile_unit with a camera of this embodiment. The figure which shows the order of the JPEG data transmitted from the transmission part of the subunit | mobile_unit with a camera of this embodiment. The figure which shows the whole structure of the conventional intercom apparatus.

Explanation of symbols

1, 61 ·· Interphone device, 10, 70 · · Door unit with camera, 20, 80 · · Master unit for living room, 30, 90 · · Wireless terminal, 40, 100 · · Transmission line, 101, 701 · · Camera 102 ··· Prescaler (image size changing unit), 103, 702, 804 ·· JPEG encoder (data compression unit), 104 · · Quantization table, 105 · · Scaler (compression rate control unit), ··· Timing generation ··· 107 ··· Header assigning portion · 108 · 202 · · Multiplexer · 109 · · Data size determination portion · 110 · · Buffer · 111 · 201 · · Transmission portion (image data transmission portion) · 203 · 302 · 802 ··· JPEG decoder, 204, 303, 803, 903, monitor, 205, recording control unit, 206, recording medium, 207, serial Shin part, 208,301,805,901 ... wireless module.

Claims (3)

Provided with a camera for capturing a visitor and a function of calling a resident, a monitor with a camera for displaying a captured image of the camera, and a function for responding to a call from the camera with a camera In an intercom device having a living room base unit,
Unlike the first image size, which is a predetermined image size for displaying the image data captured by the camera on the monitor of the living room master unit, and the first image size, the entrance unit with camera is a wireless terminal. An image size changing unit for changing to at least one Nth image size (N is an integer of 2 or more) for use in other applications such as display;
A data compression unit for compressing the data of the first image size and the data of the Nth image size changed by the image size changing unit;
A header adding unit that adds a header including predetermined information to the first image size data and the Nth image size data compressed by the data compression unit;
A handset-side output destination switching unit that outputs data of a first image size with a header or data of an Nth image size with a header to which a header is given by the header giving unit, to a plurality of different output destinations;
A data size determination unit for determining whether the data size of the Nth image size data with the header is within a predetermined data size range ;
More determination of the data size determination unit, when the data of the N image size with the header is not within the predetermined data size, as well as changing the compression rate in the data compression unit, said predetermined data size A compression rate control unit that inputs data of the Nth image size with the header not within the range to the data compression unit ;
The first image size data with the header and the Nth image size data with the header determined to be within a predetermined data size range by the data size determination unit are arranged in a predetermined order to arrange the living room and it possesses the image data transmission unit to be transmitted to the master unit,
The living room master unit has a master unit side output destination switching unit that switches an output destination of image data received from the camera entrance slave unit based on a header of image data received from the camera entrance slave unit. Characterized by the
Intercom device. 2. The intercom apparatus according to claim 1, wherein the image data transmission unit transmits the N-th image size data with the header at least in two. The image data transmission unit, and wherein the camera is for each vertical synchronizing signal output and transmits the data of the N image size with the data and the header of the first image size with the header in a predetermined order The intercom apparatus according to claim 1 or 2.

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