关键词: H.264, 帧内预测, 预测模式选择算法, 边缘方向直方图

Abstract: 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 boundary information of inner block.Pan’s fast algorithm is improved to filter out some modes and then the best prediction mode is chosen by RDO technology.Simulation results for all-I frame-sequence show that compared with JM10.2，the proposed algorithm reduces the encoding time by about 70% on average，without significant degradation of visual quality and increase in bit rate.Compared with pan，its maximum timesaving is more than 40%.So it’s helpful for real time application of H.264.

Key words: H.264, intra prediction, prediction mode decision, edge direction histogram