Patent ID: 9361707
Filing Date: 2016-06-07
CPC Classification: G06T,H04N

Claim Text:
1. A method for estimating compression noise in an image, said method comprising: receiving an additive noise estimate for an image-channel image; computing a difference value, in a first direction, at each pixel in a first plurality of pixels in said image-channel image, thereby producing a plurality of first-direction difference values; for each first-direction offset in a plurality of first-direction offsets, computing a statistical feature value of an associated plurality of first-direction difference values in said plurality of first-direction difference values, thereby producing a plurality of first-direction statistical feature values; computing a value for a first-direction first feature using said plurality of first-direction statistical feature values; comparing said first-direction first feature value with an associated threshold; when a first-direction compression criterion, based on said comparison of said first-direction first feature value with an associated threshold and said additive noise estimate, is not satisfied, setting a compression-noise estimate associated with said first direction to a value indicating said compression-noise estimate associated with said first direction is ignorable; and when said first-direction compression criterion is satisfied, computing said compression-noise estimate associated with said first direction using a first first-direction statistic computed using said first-direction statistical feature values.