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一种低码率下的新型宏块级码率控制算法

DOI: 10.11834/jig.200609205

Keywords: 码率控制,H.264视频编码标准,平均像素信息比特,宏块

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Abstract:

针对H.264编码方案,提出了一种实时的无需二次编码的低码率宏块级码率控制策略。为克服H.264码率控制模型的缺陷,首先提出了平均像素信息比特(APIB)的概念及其码率控制模型;然后在宏块层,根据各个宏块不同的编码复杂度进行准确的码字分配;接着通过APIB的变化来自适应地更新码率控制模型的系数;最后提出了完整的基于宏块的码率控制算法,并将其在JVT的JM85平台上实现。试验结果表明,与H.264中的码率控制算法JVT-G012相比,该算法不仅在控制精度上平均提高了0.171kbps,而且峰值信噪比平均提高了0.227dB,同时还较好地控制了输出码率和峰值信噪比的波动。

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