Seven Challenges in Image Quality Assessment: Past, Present, and Future Research
Figure 11
Images containing horizontally oriented wavelet distortions generated by adding random values to the LH subbands of a five-level DWT of the image lena. In the image on the left, the contrasts of the distortions have been proportioned according to ratios derived from the CSF. In the image on the right, the contrasts of the distortions have been proportioned according to the middle trend (filled circles) of Figure 10 for the image lena which specifies relatively constant contrasts across spatial frequency. Both images contain distortions at a total RMS contrast of approximately 0.18. These images were created assuming sRGB display characteristics and are meant to be viewed from approximately four picture heights.
