关键词: 高性能视频编码, 编码单元, 预测单元, 运动特征, 时空域相关性

Abstract: The coding complexity in High Efficiency Video Coding（HEVC） increases greatly owing to the adoption of quadtree structure, aiming at the problem, a fast algorithm for inter mode decision based on motion features is proposed.?Firstly, for Coding Unit （CU） at different motion areas, it utilizes depth correlation between the curren CU and the adjacent CU?in the spatio-temporal to reduce the current CU depth traversal range. Then, according to the similarity at spatial partition of the PU mode, among the current CU, the adjacent CU in the spatio-temporal and the previous depth CU, it reduces Prediction Unit （PU） mode traversal range for accelerating inter prediction process. The experimental results demonstrate that compared with HM16.9, at different access ways, the proposed algorithm can reduce about 54% coding time on average and ensure the output bit rate is less increased.

Key words: high efficiency video coding, coding unit, prediction unit, motion feature, spatio-temporal correlation