From: Prediction error preprocessing for perceptual color image compression
Image | Variance | Entropy | Gain | ||||
---|---|---|---|---|---|---|---|
 | Prediction error | Preprocessed prediction error | Watson's method | Proposed scheme | Proposed scheme | G 1 (%) | G 2 (%) |
 |  |  |  | ( γ O = 0, φ O = 1.0) | ( γ O = 0.4, φ O = 0.5) |  |  |
Baboon | 128.79 | 116.55 | 1.296 | 1.089 | 1.035 | 15.98 | 20.09 |
Barbara | 93.81 | 89.79 | 0.697 | 0.637 | 0.621 | 8.65 | 10.99 |
Goldhill | 72.93 | 70.38 | 0.775 | 0.752 | 0.738 | 3.05 | 4.77 |
Leaf | 117.14 | 113.23 | 0.575 | 0.491 | 0.465 | 14.55 | 19.13 |
Lena | 102.51 | 99.06 | 0.542 | 0.510 | 0.495 | 5.90 | 8.79 |
Monarch | 75.98 | 72.92 | 0.565 | 0.512 | 0.489 | 9.49 | 13.44 |
Sail | 82.26 | 78.51 | 0.863 | 0.739 | 0.717 | 14.36 | 16.91 |