关键词: 视频编码, 帧内预测, 候选模式, 像素梯度, 方向强度

Abstract: In order to save the intra coding time of the high efficient video coding, this paper proposes a fast mode selection algorithm for intra prediction. By judging the coding unit size, gradient and direction energy is used to predict the candidate mode respectively. The pixel gradient algorithm is used to reduce the calculation of the candidate mode process. And the judgment of direction energy can reduce the number of candidate modes. The experimental results show that the algorithm provides averagely 27.15% reduction of intra coding time compared with the test platform HM13.0, which can reach the goal of reducing the computational complexity and saving the encoding time effectively.

Key words: video coding, intra prediction, candidate mode, pixel gradient, direction energy