| 主权项 |
1. A method for establishing an evaluation standard parameter, the evaluation standard parameter 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 for the brightness orate pictures of the sample picture group to obtain a frequency distribution function, wherein the frequency distribution function is expressed by: F(ω)=F[f(t)]=∫∞−∞f(t)e−iωtdt , wherein, F(ω) is the frequency distribution function; F is the operator for the Fourier transform, and f(t) is a function for the brightness; filtering the frequency distribution function to filter the noise; applying convolution to the frequency distribution function and a contrast sensitivity function of human eye in the frequency domain to obtain a convolution function, wherein, the contrast sensitivity function of human eye is expressed as: CSF(ω)=2.6×(0.0192+0.114×ω)×e (−0.114×ω)1.1 and the convolution functions is expressed as: H(ω)=∫∞−∞F(ω)CSF(k−ω)dω, wherein, CSF(ω) is the contrast sensitivity function of human eye; ω=√{square root over (ωx 2+ωy 2)} is the spatial frequency and it's unit is cycle/degree; ωx and ωx are the horizontal direction and the vertical direction spatial frequency; H(ω) is the convolution functions; k is an offset value; the integral range is −∞□∞; normalizing to the convolution function to obtain an evaluation parameter, wherein, the evaluation parameter is expressed as:Factor=H(ω)F(ω),wherein, Factor is the evaluation parameter; and
selecting the evaluation parameter of the standard picture from the evaluation parameters of all the pictures of the sample picture group as an evaluation standard parameter. |
