Suppressing JPEG artifact using dot-diffused DC components modification

This paper presents an efficient and simple technique on reducing the false contour problem which often occurs in the JPEG decoded image. The false contour appears on JPEG decoded image while applying small quality factor. This problem induces unpleasant visual appearance. The proposed scheme exploits the usability of Dot-Diffussed Block Truncation Coding (DDBTC) approach on generating visual illumination to reduce the aforementioned problem. DDBTC modifies the DC components of all Discrete Cosine Transform (DCT) processed image on JPEG encoding stage. Experimental results show the proposed method superiority on JPEG false contour reduction.