Post-Processing Method for Reducing Blocking Artifacts Using a Deblocking Filter

A major drawback of block discrete cosine transform-based compressed image is the appearance of visible discontinuities along block boundaries in low bit-rate coding, which are commonly referred as blocking artifacts. In this paper, a post-processing method based on three separate nfiltering modes is proposed for removing these discontinuities. The method consists of three stages: in the first, better estimates of the activity across block boundary for region classification. In the second, based on region classification appropriate filtering mode is applied to the image blocks. In the third, evaluate the performance of the proposed method using performance metric- Peak Signal-to-Noise Ratio. Experiments shows that the proposed method gives better performance in terms of PSNR (Peak Signal-to-Noise Ratio) and excellent results compared with other approaches.