尺寸可变块匹配双向运动补偿视频帧间编码

为了降低尺寸可变块匹配运动补偿中优化分割的时间复杂性，提出了基于四叉树分割的尺寸可变块匹配双向运动估计和补偿方法。该方法每隔一帧进行一次双向估计和补偿，对于双向补偿帧，利用前一帧的分割信息先进行后向估计和补偿，再对包含复杂运动的小块进行前向估计和补偿，其中的重叠补偿区域采用加权平均。仿真结果显示，在分割的时间复杂性降低了50％的情况下，其峰值信噪比下降很少（平均小于0．1dB），表明该方法是可行的。

Variable Block Size Bi-Directional Motion Compensation Inter-Frame Coding

In order to reduce the complexity of the optimal segmentation in variable size block matching motion estimation and compensation, variable size bi directional motion compensation inter frame coding scheme is introduced. Bi directional compensates one frame for every two inter frames. For this frame, back block matching motion estimation and compensation is performed firstly, then the forward block matching motion estimation and compensation is achieved in the smaller blocks. The overlapped region of the compensation is computed by average. Simulation results show that the reduced peak signal to noise ratio is below 0 1 dB when time complexity of the segmentation is reduced about half the previous method. It is shown that the scheme is effective.