Error resilient pre-/post-filtering for DCT-based block coding systems

Pre-/post filtering can be attached to a DCT-based block coding system to improve the encoding efficiency as well as to mitigate blocking artifacts. Previously designed pre-/post-filters are optimized to maximize coding efficiency solely. For image and video communication over unreliable channels, those pre-/post-filters are sensitive to transmission errors. This paper addresses the problem of designing pre-/post-filters, which are more error resilient. A family of pre-/post-filters is designed to provide desired trade-offs between coding efficiency and robustness to transmission errors. These filters achieve superior reconstruction performance without sacrificing much coding performance.