关键词: 前向运动估计, 后向运动估计, 视频压缩编码, 优化分割

Abstract: A variable size block matching bi-directional motion estimation and compensation scheme was introduced.The optimal segmentation of the encoding frame was achieved by the entropy criterion.Assuming the backward frame(reference frame) was encoded by the variable size block matching backward motion estimation and compensation,then the current frame was encoded by the bi-directional motion estimation and compensation.For this frame,backward motion estimation and compensation used the segmentation information of the backward frame firstly.Then,from the backward frame to the current frame,forward motion estimation and compensation was performed on the smaller blocks.The overlapped compensation pixels were the average filter.Because it used variable sizes block matching and utilized the well performance of forward motion estimation,the prediction quality was further improved.Simulation results show that the average peak signal-noise ratio is increased with various video sequences.

Key words: backward motion estimation, forward motion estimation, video compression coding, optimal segmentation