USE OF A CLASS FUNCTIONS FOR REDUCTION OF TWO-DIMENSIONAL BLOCKING ARTIFACTS IN IMAGE CODING
Jechang Jeong, Byeungwoo Jeon · 1995
In this paper, we propose a novel blocking artifacts reduction method in image coding based on the least square block discontinuity criterion. We define the inner product on the block boundaries for NxN 2-D functions to introduce the concept of the 2-D functions. The proposed postprocessing approach attempts to find the coefficients of the boundary-orthogonal 2-D functions whose pel-by-pel sum is added to the blocky image to minimize the block discontinuity. Experimental results, using DCT-based compressed images, are provided to show the performance of the proposed scheme. In the experiments, as a special case of the proposed method, we use three terms of 2-D DCT functions which turn out to be simple but very effective in reducing blocking artifacts.