Method and system for transferring live video pictures from a video camera to a remote video displayer via a conventional telephone line

Method for transferring live video signals from a video camera of a local system to a remote video-display system via low-bandwidth communication lines, comprising the steps of;

• (a) acquiring the analog data of an initial-picture by a video camera of a local system;
• digitizing the said analog data into digital values each presents visual information of one definite picture pixel;
• grouping the pixels' digital values data into a plurality of data-blocks each contains data of one particular picture-region associated to its respective location in the picture by a particular address code wherein each picture-region consists of a few neighboring video-pixels taken from at least four neighboring video rows;
• storing each data-block in a memory means of the local system and successively transferring it with its address code information to a remote video-display system;
• (b) storing the transferred data of the initial-picture in memory means of the remote video-display system and converting the said data to a video-picture displayed on a screen of the video-display system;
• (c) acquiring successive video pictures by the video camera, digitizing the analog data of each picture into digital values each presents visual information of one definite picture pixel;
• grouping the pixels' digital values data into a plurality of similar data-blocks having the same structure and the same respective addresses as the analogous data-blocks of the initial-picture, subtracting each pixel's value of a successive picture from the analogous pixel's value of the initial picture, summing the pixels subtraction results of each block into a single value representing the significance-weight of the respective block, compressing data of blocks having significance-weight greater than a predetermined threshold-value and transferring this compressed data followed by the respective block addresses to the remote video-display system;
• (d) decompressing the said transferred data received by the remote video-display system and refreshing the relevant picture regions of the displayed video picture according to the newly received data.