Redundancy reducing coding of moving object shapes

摘要

A redundancy reducing technique for coding of object shapes in image sequences is presented. Polygon-spline approximation as known from object-based analysis-synthesis coding is used as a basis. A parametric hexagonal coordinate system sis introduced in place of the cartesian one. The range of relative coordinates is limited. By these two methods the data rate required for coding the shapes is decreased by about 13%. When additionally using temporal prediction, by exploiting the fact that the slope of an object shape does not differ so much in time, a total decrease of about 28% is achieved.