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电子学报  2013 

一种分层判决结构的H.264/AVC快速帧间模式选择方法

DOI: 10.3969/j.issn.0372-2112.2013.11.014, PP. 2199-2206

Keywords: H.264/AVC,模式选择,率失真最优化,帧间预测

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Abstract:

H.264/AVC视频编码标准采用了基于率失真最优化(RDO)技术的多种编码模式选择的预测编码方法,取得了很高的率失真效率,同时也引入了非常高的计算复杂度.为了降低RDO全搜索方法的预测复杂度,本文提出了一种分层判决结构的快速帧间模式选择方法.根据H.264/AVC帧间预测编码的结构特点,将宏块的各种模式分为4个层次.研究运动估计预测原理,利用预测编码的时间复杂度与空间复杂度之间的耦合关系,得到每个层次的自适应判决阈值,使得快速模式选择方法应用于每一个层次,在保证率失真性能的条件下,及时退出多余的全搜索率失真代价函数计算.实验结果表明,该算法平均减少了45.79%的编码时间,同时,保持了视觉质量和输出码率不变.对比结果也显示,与Zeng方法相比,得到了0.05dB的PSNR增益;相比Choi方法,本文方法节省了约20%的计算时间;本文方法优于这两种快速模式选择方法.

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