| 摘要 |
<p>The video memory requisite of an MPEG-2 decoder commonly comprising a stage of decompression of the respective I, P and B-pictures of the MPEG compression algorithm before writing the data in respective buffers organized in the video memory and in which the decompression of a B-picture implies the use of forward and backward motion compensation predictors is reduced by: decompressing by macroblocks a B-picture while maintaining the relative backward predictor, stored in said memory, in a compressed form and decompressing macroblocks of a compressed P-picture using the respective forward predictor values; defining through said decompressed P-macroblocks the region of the stored compressed backward predictor containing the backward predictor value of the macroblock of the B-picture undergoing decompression; and extracting from said region the respective backward predictor value for the B-macroblock undergoing decompression, and completing the motion compensation routine according to the MPEG standard. <IMAGE></p> |
