Patent ID: 6236763
Filing Date: 2001-05-22
Classification: G06T,H04N

Abstract:
A method of removing noise artifacts in decompressed video signals which comprises the steps of:(a) selecting a group of pixels from a larger matrix of pixels from adjacent rows and columns of said matrix;(b) selecting a plurality of different subgroups of said group of pixels, each said subgroup including at least one pixel from each of at least three of said rows or columns and including the same centrally located pixel;(c) measuring the intensity of the energy emanating from each pixel in each of said subgroups;(d) determining the maximum difference in energy among the pixels in each said subgroup and selecting the subgroup having the lowest maximum difference;(e) weighting said centrally located pixel and the neighboring pixels in said selected subgroup to provide more significance to the closer neighbors in computing a weighed mean value;(f) computing said weighed mean value; and(g) filtering the centrally located pixel based on said weighted mean value.