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Table 4 The statistics performance of different methods

From: Restoration method of sootiness mural images based on dark channel prior and Retinex by bilateral filter

Metric

True color image

Homomorphic filtering

Gaussian stretching

Proposed method

Variance

773.23

265.84

985.04

1058. 04

Average gradient

2.59

1.33

2.94

5.06

Information entropy

6.44

4.70

6.73

6.88

Gray scale contrast

16.41

6.72

20.81

21.08

  1. Italic values highlight the best results
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