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Table 3 Entropies of the proposed compression scheme with preprocessor, without prepro-cessor and the Watson's compression method at nearly the same visual quality of the reconstructed color images

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

  1. G1, gain of the proposed scheme with γ O = 0, φ O = 1.0; G2, gain of the proposed scheme with γ O = 0.4, φ O = 0.5.