JPH05304665A - Video communication system - Google Patents

Abstract

PURPOSE:To make it easy to see as a moving image by drastically reducing the amounts of communication information, shortening the intervals transferring the video screen in a low-speed circuit of video telephone or the like. CONSTITUTION:An alternate video input means 21 writes video information inputted from a camera 1 into video storage memories 22 and 23 alternately. A video storage memory comparator 24 compares the inputted video information with newly inputted video information in block units which have been broken down minutely and extracts the address of dissimilar memory block as transfer block address information 25. A partial video information transmitter 26 sends partial video informtion 27 corresponding to the transfer block address information 25. At the side of a video receiver 3, a partial video information receiver 31 receives the transfer block address information 25 and the partial video information 27, writes the partial video information 27 in the address corresponding to the received transfer block address information 25 in a video storage memory 32. Then a video output means 33 outputs the information of the video storage memory 32 to a video output screen 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video communication system, and more particularly to a video communication system using a low speed line.

[0002]

2. Description of the Related Art In the conventional video communication system, all the information on the momentary screen is transmitted at regular time intervals, and the receiving side displays all the information on the momentary screen at the reception timing.

[0003]

The above-mentioned conventional video communication system is moving because it takes a long communication time when used in a low speed communication line such as a videophone and the display interval of the instantaneous screen becomes long. It has the drawback that it is hard to see as an image.

An object of the present invention is to compare the video information to be transmitted / received in units of divided blocks, and send only the blocks having different contents together with the block address, thereby omitting the transmission of the video information without changing the background or the like Therefore, it is to provide a video communication system in which the amount of transmission and reception is significantly reduced, the transmission interval of the instantaneous screen is shortened, and the moving screen is easy to see.

[0005]

According to the video communication system of the present invention, an alternating video input means for alternately inputting a video captured by a camera into a plurality of video storage memories, and video information previously input and newly input video. Video storage memory comparison means for comparing information in finely divided partial video information in memory block units and extracting addresses of memory blocks having different contents as transfer block address information, and partial video information corresponding to the transfer block address information Partial video information transmitting means, partial video information receiving means for writing the received partial video information onto the video storage memory corresponding to the received transfer block address information, and outputting the contents of the video storage memory to the video output screen. Output video output means.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a video communication system of the present invention. As shown in FIG. 1, the alternate image input means 21 on the image transmitting side 2 alternately writes the image information input from the camera 1 into the image storage memory 22 and the image storage memory 23.

The video storage memory comparison means 24 compares the previously input video information with the newly input video information in finely divided block units, and extracts addresses of memory blocks having different contents as transfer block address information 25. Next, the partial video information transmitting means 26 transmits the partial video information 27 corresponding to the transfer block address information 25.

On the video receiving side 3, the partial video information receiving means 31 transfers the transfer block address information 25 and the partial video information 2.
7 is received, and the partial video information 27 is placed at a position corresponding to the transfer block address information 25 received in the video storage memory 32.
Write Next, the video output means 33 causes the video storage memory 32.
Information is output to the video output screen 4.

FIG. 2 is an explanatory diagram showing an example of the transfer block address information 25 and the partial video information 27. Referring to FIG. 2A, the transfer block address information 25 has a transfer block number 251, a transfer block address 252, a transfer block address 253, ...

Further, referring to FIG. 2B, the partial video information 27 has a partial video 271 corresponding to the transfer block address 252 and a partial video 272 ... Corresponding to the transfer block address 253.

[0012]

As described above, the video communication system of the present invention has a plurality of video storage memories, compares previously input video information with newly input video information in finely divided block units, and displays the video screen. The amount of communication information can be significantly reduced by transmitting the video information of only the changed portion. Therefore, even in a low-speed line such as a videophone, the interval for transmitting the video screen can be shortened, and the moving screen can be easily viewed.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a video communication system of the present invention.

FIG. 2 is an explanatory diagram showing an example of transfer block address information and partial video information.

[Explanation of symbols]

 1 camera 2 video transmission side 3 video reception side 4 video output screen 21 alternate video input means 22, 23, 32 video storage memory 24 video storage memory comparison means 25 transfer block address information 26 partial video information transmission means 27 partial video information 31 part Video information receiving means 33 Video output means

Claims (1)

[Claims] 1. An alternating image input means for alternately inputting an image captured by a camera to a plurality of image storage memories, and a memory block unit of partial image information obtained by finely dividing previously input image information and newly input image information. Video storage memory comparison means for extracting addresses of memory blocks having different contents as transfer block address information, partial video information transmitting means for transmitting partial video information corresponding to the transfer block address information, and received transfer block It is characterized by comprising partial video information receiving means for writing the partial video information received on the video storage memory corresponding to the address information, and output video output means for outputting the contents of the video storage memory to a video output screen. Video communication system.