改进的H.264快速帧内预测模式选择算法

为了减小H.264编码算法的复杂度，提出一种快速的帧内模式选择算法。根据宏块内部相邻像素差的特点判定宏块预测类型，对基于边缘方向直方图的Pan算法进行改进，利用改进的算法对选定了预测类型的宏块进行预测，选出最佳的预测模式。实验结果表明，该算法在保证失真率和码率性能的前提下，编码时间平均减少了71.6%，大大提高了编码效率。

Improved Fast Intra Prediction Mode Decision Algorithm for H.264

In order to reduce the complexity of H.264 encoding algorithm, this paper proposes a fast mode decision algorithm for intra prediction. The prediction type of a macroblock is decided according to the differences between the neighboring pixels of a macroblock. Pan’s fast algorithm based on edge direction histogram is improved to predict the macroblock; therefore the best prediction mode is chosen. Experimental results show that the method can save the encoding time up to 71.6% averagely when guarantee the capability of the rate distortion and the bits rate, and it improves the encoding efficiency tremendously.