Patent ID: 6950473
Filing Date: 2005-09-27
Classification: H04N

Abstract:
1. A method for reducing artifacts in digital data, comprising the steps of: (a) performing inverse motion compensation on transform-domain blocks of a previous frame of the digital data; (b) generating a plurality of transform-domain blocks representing a difference between a current frame's transform-domain blocks and the previous frame's inverse motion compensated transform-domain blocks; (c) combining the plurality of difference transform-domain blocks generated in step (b) with the previous frame's inverse motion compensated transform-domain blocks to generate a plurality of reconstructed transform-domain blocks representing the current frame of the digital data, each reconstructed block comprised of a DC coefficient and a plurality of AC coefficients; (d) classifying each block in the current frame as either a first type or a second type based on the transform-domain AC coefficients in that block; (e) predicting select lower frequency AC coefficients of each block in the current frame using the DC coefficient for that block and a select number of DC coefficients in adjacent blocks; and (f) performing de-blocking on each block of the first type of the current frame in the transform domain by inserting into that block the predicted AC coefficients for that block.