Early detection algorithms for 8×8 all-zero blocks in H.264/AVC
Early detection algorithms for 8×8 all-zero blocks in H.264/AVC
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DOI：
10.1109/mmsp.2008.4665103
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发表时间：
2008-10
期刊：
影响因子：
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通讯作者：
Qin Liu;Yiqing Huang;T. Ikenaga
中科院分区：
文献类型：
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作者：
Qin Liu;Yiqing Huang;T. Ikenaga
h .264高调引入了8 × 8变换来提高视频质量。经过变换和量化后，如果块体残差数据的所有系数都为零，则称该块为全零块（AZB）。许多4次4变换AZB早期检测算法被提出，跳过了变换和量化过程。本文在对8 × 8 AZB检测的充分条件进行理论分析后，提出了基于绝对差和（SAD）和绝对变换和（SATD）的8 × 8 AZB检测算法。实验结果表明，对于720p序列，本文提出的算法将计算量从0.95%提高到79.48%。计算量的减少随着QP的增加而增加。
8 times 8 transform has been introduced in H.264psilas high profile to improve the video quality. After transform and quantization, if all the coefficients of the blockpsilas residue data become zero, this block is called all-zero block (AZB). Many 4 times 4 transform AZB early detection algorithms have been proposed to skip transform and quantization process. In this paper, after theoretical analysis performed for the sufficient condition of 8 times 8 AZB detection, sum of absolute differences(SAD) and sum of absolute transformed(SATD) based 8 times 8 AZB detection algorithms are proposed. Experimental results show that the proposed algorithms achieve major improvement of computation reduction from 0.95% to 79.48% for 720p sequences. The computation reduction increases as QP increases.