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Abstract

A picture compression circuit includes a video memory and an encoding unit connected to the video memory in order to read a picture by macroblocks to subject these macroblocks to a discrete cosine transform, a quantification and a variable length coding, and to read in the memory predictor macroblocks of another picture and to subtract these predictor macroblocks from the currently processed macroblocks. A motion estimation unit can be connected to the video bus and to the encoding unit, to receive through the video bus a macroblock currently processed and a search window, in order to search in the window for a predictor macroblock. The difference of position between the predictor macroblock and the currently processed macroblock is provided as a motion estimation vector to the encoding unit.

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First Claim