一种快速HEVC帧内预测模式决策算法

摘要

High Efficiency Video Coding(HEVC) is a kind of new standard of video coding developed by the Joint Collaborative Team on Video Coding(JCT-VC). For the problem of high computational complexity of intra prediction in HEVC, a fast intra prediction algorithm based on edge direction detection is proposed. The proposed method divides 35 intra prediction modes into 5 sets of candidate modes according to 5 basic directions, and each set contains 11 intra prediction modes. The edge direction strength of Prediction Unit(PU) in 5 directions are calculated. The proportion of each direction is calculated and the candidate modes are selected to set corresponding edge direction with the largest proportion as best candidate modes for PU to reduce computational complexity effectively. Experimental results show that the proposed method saves encoding time of 15% and 18% on average compared with HM8.0 in high efficiency and low complexity.%高性能视频编码(HEVC)标准是视频编码联合小组提出的新的视频编码标准。针对HEVC帧内预测模式决策的高计算复杂度问题，提出一种基于边缘方向强度检测的快速帧内预测模式决策算法。将35种帧内预测模式根据5个基本方向分为5个预测候选模式集合，每个集合中有11种预测模式。分别计算预测单元(PU)的5个方向的方向强度，以及每个方向所占比例，选择比例最大的方向所对应的候选模式集合为该PU块的候选预测模式，有效减少帧内预测的计算复杂度。实验结果证明，与HM8.0相比，该算法能够以保证视频质量为前提，在高效率条件和低复杂度条件下平均节省15%和18%的编码时间。