Memory reduction in the MPEG-2 main profile main level decoder

Details Memory reduction in the MPEG-2 main profile main level decoder Memory reduction in the MPEG-2 main profile main level decoder

1997-02-13

1999-07-13

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

348384, 348413, 348416, H04N 732

Patent

active

059233753

ABSTRACT:
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 without losing image quality. This is achieved by: decompressing by macroblocks a B-picture while maintaining the relative backward predictor, stored in the memory, in a compressed form and decompressing macroblocks of a compressed P-picture using the respective forward predictor values; defining through the 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 the region the respective backward predictor value for the B-macroblock undergoing decompression, and completing the motion compensation routine according to the MPEG standard.

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