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Table 2 Rate e of new visible edges, mean ratio r ̄ of the gradients at visible edges and the image information entropy H for these methods on three test images

From: Visibility enhancement using an image filtering approach

Images/Index [20] [21] Proposed
Forest e 0.35 0.54 0.02
  r ̄ 0.59 2.26 1.45
  H 5.15 7.25 6.42
Wall e 0.15 0.44 0.20
  r ̄ 0.45 1.86 1.77
  H 6.14 7.34 7.08
Sweden e −0.09 0.49 0.29
  r ̄ 0.65 1.73 2.02
  H 6.42 7.38 7.37