Total Variation Based Perceptual Image Quality Assessment Modeling
Figure 4
Contrast change distortion analysis in frequency domain. The first row images are the reference image and contrast change distorted images. The second row images are Fourier spectrums of the first row images. (a) Reference image. Background is black with a white square. The gray values of the background and the square are 0 and 255, respectively. (b) Contrast change distortion level 1. Background is 30, and square is 226. (c) Contrast change distortion level 2. Background is 60, and square is 196. (d) Contrast change distortion level 3. Background is 120, and square is 136.
