Patent ID: 7783130
Filing Date: 2010-08-24
Classification: G06T,H04N

Abstract:
1. A method of reducing wrap-around in a digital image processing process that compares a digital test image and a digital reference image and that includes one or more convolution steps, the method comprising: a) producing a reference luminance image from the reference image and a test luminance image from the test image; b) producing a local mean luminance reference image as a convolution of the reference luminance image and a luminance filter function; c) producing a test contrast image that is at least one of the following: (c d) producing a reference contrast image that is at least one of the following: (d e) applying a contrast sensitivity filter to the test contrast image to produce a filtered test image; f) applying the contrast sensitivity filter to the reference contrast image to produce a filtered reference image; g) providing a difference image by at least one of the following two processes: (g h) producing a just noticeable difference image as a mathematical combination of the difference image with a window function; and i) pooling the just noticeable difference image to produce a visibility metric, wherein the convolution operation in at least one of process (b) and process (h) is performed using a confined convolution process that comprises: