JP3263664B2 - Communication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a communication apparatus for transmitting and receiving images using a communication line as a transmission medium.

[0002]

2. Description of the Related Art Conventionally, as such a communication device, FIG.
There is a videophone device as shown in FIG.

[0003] 1 is a line interface unit for connecting to a digital communication line, 23 is a data transmission unit, 3 is a telephone unit, 24 is a data processing control unit for processing image information and various control information, 25 is an operation unit, 6 Is a display memory, 7 is D /
A converter, 8 is a display unit for displaying an image in the display memory 6, 9 is an imaging unit for taking an image, and 10 is A
/ D converter, 11 is a capture memory, 21 is a digital communication line, and 22 is a line terminator (hereinafter abbreviated as "DSU").

Next, the operation will be described. An image such as a person image captured by the imaging unit 9 is converted into a digital video signal by the A / D converter 10 and stored in the capture memory 11. The digital video signal stored in the capture memory 11 is subjected to image compression processing in the data processing control unit 24, converted into image data, and sent to the data transmission unit 23. The data transmission unit 23 converts the image data into serial data conforming to the transmission speed of the digital communication line, sends the serial data to the line interface unit 1, and sends out the serial data to the other terminal via the DSU 22 and the digital communication line 21.

[0005] Assuming that the other terminal is a videophone having the same configuration as the apparatus, the other terminal receives image data from the DSU 22 at the data transmission unit 23 via the line interface unit 1. The data transmission unit 23 extracts image data from the serial data and sends it to the data processing control unit 24. The data processing control unit 24 performs a decoding process on the image data and converts the image data into a digital video signal. This digital video signal is stored in the display memory 6, converted into an analog video signal by the D / A converter 7, and displayed on the display unit 8.

[0006]

However, in the above-mentioned conventional apparatus, first, the screen standards of the images to be transmitted to each other are negotiated between the users, and after the image communication is started, each user starts to transmit the images being transmitted. The screen standard or the screen standard of the image being received cannot be changed arbitrarily. The present invention has been made in view of such a point, and its purpose is not only to allow a user to arbitrarily convert the screen standard of an image being transmitted to a partner user during image communication, but also to be transmitted from the partner user. It is an object of the present invention to provide a device capable of arbitrarily remotely controlling the screen standard of an incoming image.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a communication apparatus for performing videophone communication by transmitting image data obtained by compressing an input video signal, in a horizontal and vertical direction of image data being transmitted to a partner terminal. Data processing control means for changing the number of pixels, control information processing means for multiplexing the changed control information indicating the number of pixels in the horizontal and vertical directions with the image data being transmitted, and an image being transmitted to the partner terminal. Means for receiving, from the partner terminal, control information indicating the number of pixels in the horizontal and vertical directions requested to be changed by the partner terminal with respect to the data, wherein the data processing control unit includes: Signal, or the number of horizontal and vertical pixels of the image data being transmitted is changed in accordance with the control information received from the partner terminal, and the control information processing unit changes the number of pixels. Rights and control information indicating the number of pixels in the vertical direction, the number of pixels the modified horizontal and vertical directions
It is characterized in that it is multiplexed immediately before image data subjected to a certain image compression process .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 is a block diagram showing a circuit configuration of the videophone device according to the present embodiment. The control information processing unit 12 is added to the conventional videophone device shown in FIG. 4, and a data transmission unit 23, a data processing control unit 24, The operation unit 25 is improved.

Here, the control information processing section 12 selects a screen standard input from the operation section 5 or the data transmission section 4.
The function of issuing an instruction to the data processing control unit 4 in accordance with the control information received via the interface unit and the function of outputting control information in accordance with the screen standard selection input input from the operation unit 5 to the data transmission unit 2. . The data transmission unit 2 functions to transmit the control information input from the control information processing unit 12 to the other user together with the image data, and to output the control information transmitted from the other user to the control information processing unit 12.

The operation of the device according to the present invention will be described. Imaging unit 9
Image such as a person image captured by the A / D converter 10
Is converted into a digital video signal and stored in the capture memory 11. The digital video signal stored in the capture memory 11 is subjected to image compression processing in the data processing control unit 4 in accordance with an instruction from the control information processing unit 12, converted into image data, and sent to the data transmission unit 2. The data transmission unit 2 converts the image data or the control information of the screen standard into serial data conforming to the transmission speed of the digital communication line, sends the serial data to the line interface unit 1, and sends it out to the partner terminal via the DSU 22 and the digital communication line 21. .

The partner terminal receives the image data from the DSU 22 at the data transmission unit 2 via the line interface unit 1. The data transmission unit 2 extracts image data from the serial data and sends it to the data processing unit 4. Similarly, it extracts control information of the screen standard and sends it to the control information processing unit 12. The control information processing unit 12 outputs control information of the screen standard to the data processing control unit 4. The data processing control unit 4 performs a decoding process on the image data according to the control information to convert the image data into a digital video signal. This digital video signal is stored in the display memory 6, converted into an analog video signal by the D / A converter 7, and displayed on the display unit 8.

In one embodiment of the present invention, three types of screen standards for images to be transmitted are prepared. The number of pixels in the horizontal direction (hereinafter abbreviated as “H”) and the vertical direction (hereinafter abbreviated as “V”) of each screen standard is 512 (H) × 4 in the high resolution mode.
80 (V) pixels, 256 (H) × 240 in standard mode
(V) pixels, 128 (H) × 120 in high-speed mode
(V) pixels. The number of gradations is the same for all three modes, and the luminance signal and the color difference signal have 256 gradations.

FIG. 2 shows a transmission format of the control information of the screen standard. The control information on the screen is coded in the control information field shown in FIG. 2 and sent to the partner device. FIG. 2A shows a case where only control information is transmitted, and FIG. 2B shows a case where it is transmitted together with image data.

When a device user changes the screen standard of an image being transmitted, a switching signal is input to the control information processing unit 12 by pressing a button on the operation unit 5. The video signal to be transmitted is subjected to image compression conforming to the screen standard in the data processing control unit 4 according to the instruction of the control information processing unit 12, converted into image data, and transmitted to the data transmission unit 2.

The data transmission unit 2 multiplexes only control information as shown in FIG. 2A or control information of a screen standard on image data being transmitted as shown in FIG. Transmit to device.

On the other hand, when the user wants to change the screen standard of the image being received from the other user, a switching signal is input to the control information processing unit 12 by pressing a button on the operation unit 5, and the data is transmitted via the data transmission unit 2. As shown in FIG. 2A, only the control information is transmitted, or as shown in FIG. 2B, the control information of the screen standard is multiplexed with the image data being transmitted, and transmitted to the partner user apparatus.

The partner user device that has received the control information issues an instruction from the control information processing unit 12 to the data processing control unit 4 according to the control information. Image compression processing is performed according to the instruction, and the image data is converted into image data. The method of transmitting the image data is the same as the method of transmitting the image data to the above-mentioned user, and thus the description is omitted here.

Next, the data transmission section will be described. FIG.
2 shows a block diagram of the data transmission unit 2. Here, reference numeral 31 denotes a serial interface circuit (hereinafter referred to as "SI / F") for converting an information channel signal transmitted / received via a digital communication line into parallel data, or conversely, converting parallel data into an information channel signal. ). The SI / F 31 is supplied with a clock signal from the line interface unit 1. Reference numeral 32 denotes a CPU for controlling the entire data transmission unit. 34 is a random access memory (hereinafter abbreviated as “RAM”), and 35 is a read-only memory (hereinafter abbreviated as “ROM”). 36 is a parallel interface (hereinafter abbreviated as "PI / F") for exchanging data between the data processing control unit 4 and the CPU 32, and 33 is control information between the control information processing unit 12 and the CPU 32. (Hereinafter, abbreviated as “I / F”).

The data received from the videophone device as the partner terminal is received by the SI / F 31 from the line interface unit 1 and temporarily stored in the RAM 34 by the CPU 32.
Of the data stored in the RAM 34, the image data is P
The information is sent to the data control unit 4 via the I / F 36, and the control information is sent to the data control unit 4 via the I / F 36.

On the other hand, the image data from the data processing control section 4 is taken into the RAM 34 via the PI / F 36.
The control information is transmitted from the control information processing unit 12 to the I / F 33.
Via the RAM 34. The image data and control information taken into the RAM 34 are multiplexed and SI / F3
The signal is converted into an information channel signal via the line 1 and sent to the line interface unit 1 to be transmitted to a videophone device as a partner terminal.

In this way, the user can arbitrarily change the screen standard of the image being transmitted to the other user during the image communication by transmitting and receiving the control information of the image standard between the users during the image communication. In addition, it is possible to provide an apparatus capable of arbitrarily changing the screen standard of an image sent from a partner user.

[0022]

As is clear from the above, in the communication apparatus of the present invention, not only the user can arbitrarily change the screen standard of the image being transmitted to the other user during image communication, but also the image transmitted from the other user. It is possible to remotely control the screen standard of any device, so the user using the device can switch the high resolution mode or high speed mode at any time according to the intended use at any time,
It is possible to switch and use freely from either side.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of a videophone device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a transmission format of a control signal in one embodiment of the present invention.

FIG. 3 is a block diagram illustrating a circuit configuration of a data transmission unit according to one embodiment of the present invention.

FIG. 4 is a diagram showing a circuit configuration of a conventional videophone device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Line interface part 2 Data transmission part 3 Telephone part 4 Data processing control part 5 Operation part 21 Digital communication line 22 DSU

Claims (1)

(57) [Claims] 1. A data processing control for changing the number of pixels in the horizontal and vertical directions of image data being transmitted to a partner terminal in a communication device performing videophone communication by transmitting image data obtained by compressing an input video signal. Means, control information processing means for multiplexing the changed control information indicating the number of pixels in the horizontal and vertical directions to the image data being transmitted, and from the partner terminal for the image data being transmitted to the partner terminal. Means for receiving control information indicating the number of pixels in the horizontal and vertical directions requested to be changed from the partner terminal, wherein the data processing control means receives a switching signal input from the own terminal or receives from the partner terminal. The number of horizontal and vertical pixels of the image data being transmitted is changed according to the control information thus obtained. Control information indicating a communication apparatus characterized by image compression processing that has been in the number of pixels of the modified horizontal and vertical directions are multiplexed immediately before the image <br/> image data that have been made.