Modified regularized image restoration for postprocessing inter-frame coded images

In this peeper, we propose a degradation model for blocking artifacts in inter-frame coded images and corresponding iterative image restoration algorithm for reducing blocking artifacts. In inter-frame coded images, most restoration process is performed in differential image between the previous motion compensated image and the current image. In order to efficiently reduce blocking artifacts, edge direction of each block is classified by using the DCT coefficients and spatially adaptive regularized iterative algorithm is used to remove blocking artifacts. We used a constraint which assumes that in differential image there must be discontinuity in opposite direction to the motion compensated image. The proposed algorithm is suitable for postprocessing reconstructed image sequences in HDTV, DVD, or video conferencing systems