摘要
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 5 0 %的情况下 ,其峰值信噪比下降很少 (平均小于 0 1dB) 。
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. 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 by 50%. It is shown that the scheme is effective.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2002年第6期616-619,共4页
Journal of Xi'an Jiaotong University
基金
教育部博士点基金资助项目 (2 0 0 0 0 6 982 8)
西安交通大学博士学位论文基金资助项目 (DFXJU2 0 0 0 - 8)
关键词
视频编码
四叉树分割
双向运动补偿
Image segmentation
Motion compensation
Optimal control systems
Simulation
