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Method and system for increasing robustness of visual quality metrics using spatial shifting

  • US 8,983,206 B2
  • Filed: 05/03/2012
  • Issued: 03/17/2015
  • Est. Priority Date: 05/04/2011
  • Status: Active Grant
First Claim
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1. A method of computing a measure of quality for a distorted image Y, the measure characterizing a similarity between the image Y and an undistorted reference image X having the same number of rows and columns of pixels as the image Y, the method comprising:

  • employing at least one processor for;

    (a) transforming the distorted image Y and the undistorted reference image X by a transformation process to generate a transform of the distorted image Y and a transform of the undistorted reference image X respectively, the transformation process having a blindness property of not containing all information regarding an image to be transformed in a transform of the image, thus resulting in certain pixel patterns of the image leading to zero transform coefficients not to be recognized during the transformation process;

    (b) spatially shifting pixels in the reference image X and the distorted image Y by a spatial shift, having the same predefined amount of pixels, to generate a spatially shifted version X2 of the reference image X and a spatially shifted version Y2 of the image Y respectively, the spatial shift being chosen so that the certain pixel patterns in images X and Y leading to zero transform coefficients upon applying the transformation process to the images X and Y would lead to non zero values for the transform coefficients upon applying the transformation process to the images X2 and Y2, thereby making the certain patterns detectable by using the transformation process applied to the spatially shifted versions X2 and Y2;

    (c) transforming the spatially shifted version Y2 and the spatially shifted version X2 by the transformation process to generate a transform of the spatially shifted version Y2 and a transform of the spatially shifted version X2 respectively; and

    (d) determining the measure of quality for the distorted image Y as a function of the transform of the distorted image Y, the transform of the undistorted reference image X, the transform of the spatially shifted version Y2, and the transform of the spatially shifted version X2.

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