一种H.264帧内预测模式快速选择算法

• 作 者: 赵金 张有会 王志巍 杨会云 霍利岭 高申友
• 机 构: 河北师范大学数学与信息科学学院,河北省军区通信处,
• 出 处: 燕山大学学报
• 发表日期: 2010年01期
• 关键词: H.264 帧内预测 模式选择 纹理方向

H.264使用率失真优化提高了编码效率,但也增加了计算复杂度,不利于编码的实时实现。本文分析了H.264中计算复杂度较高的帧内预测模式选择部分,提出一种快速的帧内预测模式选择算法。根据隶属度函数预先判断宏块类型,通过求取各像素点的方向得到4×4块的纹理方向,由此确定候选模式,减少预测模式的数量。实验结果表明,在图像性能和码率基本保持不变的情况下,编码时间平均下降了约38%,大大提高了编码速度。

H.264 usage distortion optimization improves the coding efficiency, but also increases the computational complexity, which is not conducive to real-time coding. This paper analyzes the high computational complexity of H.264 intra prediction mode selection, and proposes a fast intra prediction mode selection algorithm. According to the membership function, the type of macroblock is determined in advance, and the texture direction of 4 × 4 blocks is obtained by determining the direction of each pixel, so as to determine the candidate mode and reduce the number of prediction modes. Experimental results show that the coding time is reduced by about 38% on average while the performance and coding rate remain basically unchanged, which greatly improves the coding speed.