Authors:
Kyohyuk Lee
;
Woojin Han
and
Tammy Lee
Affiliation:
Digital Media R&D Center, Korea, Republic of
Keyword(s):
Video coding, video signal processing, H.264, MPEG-4 AVC, skip mode.
Related
Ontology
Subjects/Areas/Topics:
Image and Video Processing, Compression and Segmentation
;
Multimedia
;
Multimedia Signal Processing
;
Telecommunications
Abstract:
H.264 (MPEG-4 AVC) is the state of the art international video coding standard which shows better coding efficiency compared to previous standards. This contribution is on the improvement of motion derivation process of H.264 SKIP mode. H.264 exploits temporal or spatial motion field correlation to derive current motion field. Temporal or spatial direct mode macroblock for B slice and skip mode macroblock for P slice are adopted for exploitation of motion field correlation. In general, H.264 SKIP mode macroblock has great impact on coding efficiency because about 30 ~ 70% of macroblocks are set as skip mode. SKIP mode macroblock derives one motion vector for whole 16x16 macroblock region from spatial correlation. In this contribution, we improved SKIP mode motion field further instead of setting one motion vector for 16x16 macroblock region. We split 16x16 macroblock into four 8x8
sub-partitions and set each sub-partition SKIP mode motion field separately. Experimental results show
ed average 2.05% and up to 18.63% bit rate reduction, especially higher coding efficiency in low bit rate condition.
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