CSS Based Vop Shape Coding Algorithm
基于曲率尺度空间的VOP形状编码算法

In this paper, a new shape coding algorithm called curvature scale space based shape coding(CSS) is proposed. For dealing with video image, we regard a shape as a set of points that are parameterized by arc length. Then, the evolution of curve at different resolution levels in Gaussian scale space is achieved by convoluting the curve with Gaussian kernel. By calculating the curvature, the feature-points including significant information of shape contour can be found. But for shape coding, this shape representation will not very efficient when the shape consists of arcs. So, the CSS is modified, then extract the feature points of shape using the modified CSS algorithm. The octants algorithm is modified and encode the feature points by using adaptive arithmetic code algorithm. Simulation results show that our proposed algorithm has higher compress ratio, better subjective quality compared with other results from the CAE in MPEG-4.