Process for coding by transformation for the transmission of picture signals
DCFirst Claim
1. A process for coding by transformation forthe transmission on a transmission line of a picture signal constituted by a sequence of frames, each containing a picture, said process comprising a stage of breaking the picture down into blocks, each block containing a group of matrix-organized digital data and representing part of the picture, the process being characterized in that it comprises, for each block, the steps of detecting movement of the block by comparing the said block of the current picture with the corresponding block of the preceding picture, if no movement is detected in the block, transmitting on the transmission line a non-refreshing code for the block and an identification code for the block in the picture and if a movement is detected in the block, breaking down the block into several subblocks, detecting movement in each subblock of the block by comparing with the corresponding subblock of the corresponding block of the preceding picture and transmitting on the transmission line a code which is a function of the movement of the subblock.
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Abstract
A process for coding by transformation for the transmission of an image signal, comprises a stage of breaking down the image into blocks, each block containing a set of matrix-organized digital data and representing part of the picture, said process being characterized in that it comprises, for each block a step of detecting the movement of the block by comparing said block of the current image with the corresponding block of the preceding image, transmitting a non-refreshing code for the block and an identification code for the block in the image if the block is fixed, if a movement is detected in the block, breaking down the block into several subblocks, movement detection in each subblock by comparison with the corresponding subblock of the corresponding block of the preceding picture and transmission of a code which is a function of the movement of the subblock, if the block is moving.
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Citations
8 Claims
- 1. A process for coding by transformation forthe transmission on a transmission line of a picture signal constituted by a sequence of frames, each containing a picture, said process comprising a stage of breaking the picture down into blocks, each block containing a group of matrix-organized digital data and representing part of the picture, the process being characterized in that it comprises, for each block, the steps of detecting movement of the block by comparing the said block of the current picture with the corresponding block of the preceding picture, if no movement is detected in the block, transmitting on the transmission line a non-refreshing code for the block and an identification code for the block in the picture and if a movement is detected in the block, breaking down the block into several subblocks, detecting movement in each subblock of the block by comparing with the corresponding subblock of the corresponding block of the preceding picture and transmitting on the transmission line a code which is a function of the movement of the subblock.
Specification