关键词: H.264标准, 帧内预测, 纹理方向, 模式选择

Abstract: Intra prediction is a key technique of improving H.264 encoding efficient，but its computational complexity is the bottleneck of intra-encoding.After a simple analysis of the intra prediction，a new fast algorithm is proposed，which is based on estimating the image texture direction.In the algorithm，the block texture direction is estimated based on the adjacent pixels firstly，and then according to this direction the prediction mode is decided.The number of prediction modes and the algorithm complexity are reduced effectively.The experiment results show that the proposed algorithm can improve the H.264 encoding speed greatly with little image quality degradation and code-rate rise.

Key words: H.264 standard, intra prediction, texture direction, mode decision