%0 Journal Article %A XU Pei-lai %A YANG Jin %A LIU Jian-bo %T Improved de-blocking algorithm based on MRF theory %D 2007 %R %J Computer Engineering and Applications %P 63-66 %V 43 %N 21 %X Block DCT is the mostly popular transform method for image and video compression now,applied in many image compression standards with important influence such as MPEG,JPEG,H.261,and so on.With BDCT method,higher compression ratios of image are achieved.But BDCT also brings some effects that will reduce the quality of images,and blocking artifacts are usually phenomena.Many existent de-blocking algorithm either blurred images or not achieved ideal result of de-blocking.Considered all of de-blocking and protection the information of high frequency,this paper presents a de-blocking algorithm with segmentation idea into MRF,by selecting different potential function in MRF according to different area:image edge,texture area,monotone area and block edge.We also have worked on the statistics of gray offset introduced by blocking artifacts and then have improved the computing method of MRF model,which greatly simples the compute process.Haven improved the methods of edge detection and image segmentation with quickly process.Experiments demonstrate that this algorithm can achieve a good result of the protection of high frequency information as well as better reduction of blocking artifacts,and also with little process time. %U http://cea.ceaj.org/EN/abstract/article_22844.shtml