Adaptive. Neighbourhood Image Filtering for Mpeg-1 Coded Images

Several linear post-filtering methods have been proposed in video coding literature to reduce the blocking artifact which is a common problem in block-based coding mechanisms used in various digital image and video coding standards. In this paper, an algorithm for post-filtering is proposed, based on local statistical characteristics of a video image. This algorithm makes the filtering process adaptive when filtering the blocking artifacts at different quantisation levels using the linear filters. In the filtering process, the proposed algorithm first determines the blocks causing high blocking artifacts and then the linear filters are applied to these blocks to reduce the artifacts.