SYSTEM AND METHOD FOR SUPPRESSING BLOCKING ARTIFACTS IN DECODED TRANSFORM CODED IMAGES

摘要

A system and method for image processing is disclosed wherein blocking artifacts are decreased or removed in regions of slowly varying intensity, i.e., low activity, in an image reproduction decoded from a transform coded image representation. The de-blocking procedure may be applied to JPEG DCT-based decoded images, and AC prediction is done selectively only in regions of low activity and only if the AC prediction is consistent with known decoded AC coefficient values of lower precision than the predicted values.