Coding of arbitrarily shaped video objects using B-spline wavelets

This paper addresses the problem of encoding and decoding image patches in a model-based image coding scheme. Any arbitrarily shaped video object can be represented using a triangular mesh. A method for coding triangular image blocks using B-spline wavelet filter banks is developed here. Triangles are considered degenerate rectangular blocks hence the same coding can be used for rectangular blocks as well. Triangles at the boundary of a video object are allowed to have curved boundaries in order to have more accurate shape representation using fewer elements. In the decoding end, patches are warped using affine motion estimates. Examples are given using real image data.