Two-step improved-breaking-off-search motion estimation algorithm and low-power 0.13-μm CMOS motion estimators for MPEG-2 encoding

摘要

Power dissipation (P) of an absolute difference (AD) circuit has been required to reduce as low as 0.1 W. The "tow-step improved-breaking-off-search (2S-IBOS)" method, which can drastically reduces the number of block matchings (N{sub}b) to 1/3 that of the full-search (FS) method, and maintain the visual quality at the same level with FS. A new 0.13-μm CMOS Wallace-tree type Ad circuit for MPEG-2, MP@ML was designed using 2S-IBOS. P was reduced to 83 mW, which is only 14.4% that of the previous designed AD circuit using FS. With a low-bit resolution (4 bit/pixel) technology, P was further reduced to 44 mW.