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HardwareOriented Early Detection Algorithms for 44 and 88 AllZero Blocks in H.264
Qin LIU Yiqing HUANG Satoshi GOTO Takeshi IKENAGA
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E92A
No.4
pp.10631071 Publication Date: 2009/04/01 Online ISSN: 17451337
DOI: 10.1587/transfun.E92.A.1063 Print ISSN: 09168508 Type of Manuscript: Special Section PAPER (Special Section on Advanced Technologies Emerging Mainly from the 21st Workshop on Circuits and Systems in Karuizawa) Category: Keyword: allzero block, early detection, sum of absolute difference, hardwareoriented, H.264,
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Summary:
H.264 is the latest HDTV video compression standard, which provides a significant improvement in coding efficiency at the cost of huge computation complexity. After transform and quantization, if all the coefficients of the block's residue data are zero, this block is called allzero block (AZB). Provided that an AZB can be detected early, the process of transform and quantization on an AZB can be skipped, which reduces significant redundant computations. In this paper, a theoretical analysis is performed for the sufficient condition for AZB detection. As a result, a partial sum of absolute difference (SAD) based 44 AZB detection algorithm is derived. And then, a hardwareoriented AZB detection algorithm is proposed by modifying the order of SAD calculation. Furthermore, a quantization parameter (QP) oriented 88 AZB detection algorithm is proposed according to the AZB's statistical analysis. Experimental results show that the proposed algorithm outperforms the previous methods in all cases and achieves major improvement of computation reduction in the range from 6.7% to 42.3% for 44 blocks, from 0.24% to 79.48% for 88 blocks. The computation reduction increases as QP increases.

