Patent ID: 6456664
Filing Date: 2002-09-24
Classification: H04N

Abstract:
A motion image encoder which selectively performs one of intraframe coding and interframe coding of blocks forming each of a plurality of consecutively transmitted frames representing motion images, said motion image encoder comprising:a deriving section which sequentially derives block image variation magnitudes for each of the blocks in each of the consecutively transmitted frames, each of said block image variation magnitudes being derived by comparing corresponding blocks of each pair of consecutive frames; an accumulating section which adds said block image variation magnitudes for the corresponding blocks of each of the consecutively transmitted frames to derive an image variation cumulative value for each block; a selecting section which, based on said image variation cumulative values for each respective block, selects at least one of the blocks on which to perform the intraframe coding; and a coding section which performs the intraframe coding on said at least one of the blocks selected by said selection section.