Pattern Analysis Through Edge for the Reduction of Artifact of Decompressed Image in DCT Domain

In this paper, we present a simple and effective approach for measurement of blocking artifact with optimal 2-D step function. First, a simple edge detection technique is designed for the measurement of blocking artifacts. Based on the visibility of blocking artifact in the edge image, optimal 2-D step function is chosen. In frequency domain, blocking artifact reduction algorithm is designed to extract all the parameters needed to detect the presence of blocking artifacts and replace optimal step function with ramp function by changing the coefficient of first row of horizontal blocks with the coefficient of shifted block. The proposed technique is experimented on various standard benchmark images and found to have improvement in the perceptual quality of the JPEG compressed images after removal of blocking artifact with the proposed method.