New objective criterion for error evaluation of video object contour

For the communication via digital video, many techniques presently used are not based on image elements but rather video objects having an arbitrary shape. The contour of this shape has to be transmitted and therefore compressed as well. The example is standard MPEG-4. In mobile video communication, transmission errors and loss of data will occur. In the paper, different approaches to object contour error evaluation are discussed. The contour error occurs as a result of approximation during encoding and transmission errors. As a compare criterion of the evaluation, Hausdorff distance between convex polygons is used. New evaluation is constructed on the technique of transforming the Cartesian x and y contour coordinate functions to the domain of polar coordinates yielding an r and a phi function. New evaluation respects specific local artifacts or errors better if compared to systems based on distance of point sets.