Patent ID: 8149336

Claim:
A method of reducing noise in a video comprising: separating a video frame into luminance channel data and chrominance channel data; filtering said chrominance channel data to reduce chrominance noise and said luminance channel data to reduce luminance noise said filtering based upon a local standard deviation over non-overlapping image blocks of the video frame for said luminance channel data and for each of first and second channels of said chrominance channel data; combining said filtered chrominance channel data and said filtered luminance channel data to generate a first filtered output; and blending said first filtered output with a second filtered output generated from a previous noise-reduced video frame to generate a new noise-reduced video where a relative weight of the first filtered output and the second filtered output used in the blending of the first and second filtered outputs depends on the amount of foreground activity within the frames where relatively more weight is given to the previous noise reduced video frame for background regions and relatively more weight to the first filtered output for foreground regions.