一种基于冗余小波变换的DT网格运动估计和运动补偿方法

网格划分和网格顶点的运动估计是基于不规则网格的视频压缩技术的关键。为了进一步提高网格运动估计和运动补偿的效果,在综合比较现有冗余小波变换域运动估计方法和适用规则网格的EMRMC算法的基础上,提出了一种新的基于不规则网格的运动估计和运动补偿算法,即在冗余小波变换域提取特征点和运动潜在区,网格顶点的运动估计采用结合运动潜在区的在时域进行块匹配的运动估计和运动补偿方法,而运动补偿则通过三角形仿射变换完成。同时还给出了冗余小波变换域提取运动潜在区的计算模板。理论分析和实验结果表明,该算法在补偿效果方面较前两种方法得到了改进。

A Delaunay Mesh-based Motion Estimation and Compensation Scheme based on Redundant Wavelet Transform

In this paper,a new motion estimation and motion compensation scheme based on irregular mesh is proposed using a shift invariant redundant wavelet transform.Control points and PMA(potential motion areas)are identified with a simple correlated operator in the redundant wavelet subbands,while motion estimation is completed through incorporating the PMA into block matching algorithm in spatial domain.The motion compensation is realized through an affine transform mapping triangles from one frame to the other.Furthermore,we give a mask of the PMA.We compared it empirically to the two other ME/MC methods both based on regular mesh deployed in the spatial and based on irregular mesh deployed in the redundant wavelet domain.Experimental results indicate that the complexity has been reduced and the compensation effect could be improved compared to the other two ME/MC methods.