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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