Patent ID: 7860167
Filing Date: 2010-12-28
Classification: G06T,H04N

Abstract:
1. A method for reducing noise in a DCT-based decoded image, said method comprising: a. associating each pixel of a plurality of pixels defining said image to a corresponding image region type having distinct spatial characteristics; b. estimating artifact statistical characteristics of each of said pixels using said associated corresponding image region type; and c. performing a tempo-spatial filtering of each of said pixels using said artifact estimated statistical characteristics, said performing of said tempo-spatial filtering comprising performing a temporal filtering to provide a temporally filtered signal and then performing a spatial filtering of said temporally filtered signal; calculating a corrected signal against artifact related to a compression technique used for encoding said image using said temporally-spatially filtered signal and calculating an indication of an offset in said image for use in at least one of said calculating a corrected signal and said estimating artifact statistical characteristics whereby the filtered pixels are used for producing said image having reduced noise.