Patent ID: 8958639
Filing Date: 2015-02-17
Classification: G06T,G09G,H04N

Abstract:
1. A method for establishing evaluation standard parameters, the evaluation standard parameters for evaluating the quality of a display image, the quality of the image being inversely proportional to the severity degree of the color shift phenomenon of the image, the method comprising: taking pictures to a group of test images having different color shift severity degrees to obtain a sample picture group, and selecting a standard picture from the sample picture group by human eye; applying the Fourier transform to tristimulus values of pictures of the sample picture group to obtain a frequency distribution function corresponding to each primary color, wherein the frequency distribution function corresponding to each primary color is respectively expressed as: wherein F (ω respectively filtering the frequency distribution function corresponding to each primary color to filter the noise; respectively applying convolution to the frequency distribution function corresponding to each primary color with a contrast sensitivity function of human eye in the frequency domain to obtain three convolution functions, the contrast sensitivity function of human eye is expressed as: wherein, CSF(ω) is the contrast sensitivity function of human eye; ω=√{square root over (ω respectively normalizing to each of the convolution functions for obtaining an evaluation parameter of each primary color, the evaluation parameter of each primary color is expressed as: wherein, Factor wherein, the step of respectively normalizing to each of the convolution functions specifically includes: proceeding a center translation of an origin of each convolution function; calculating an absolute value of each convolution function at the origin; calculating a sum of the absolute values of the frequency distribution function corresponding to each convolution function; and calculating a ratio of the absolute value of each convolution function at the origin to the sum of the absolute values of the frequency distribution function corresponding to each convolution function; and selecting the evaluation parameters of the three primary colors of the standard picture from the sample picture group as the evaluation standard parameters.