Table 2 Quantitative comparison on the light enhancement experiment.

From: Low-illumination and noisy bridge crack image restoration by deep CNN denoiser and normalized flow module

Light level

Index

LIME25

ZeroDCE21

DEEPUPE18

R2RNet20

Ours

70%

PSNR↑

17.377

25.171

17.819

11.233

21.5854

SSIM↑

0.944

0.923

0.936

0.580

0.9464

LPIPS↓

0.152

0.138

0.129

0.441

0.106

50%

PSNR↑

23.260

19.782

17.757

13.718

23.982

SSIM↑

0.970

0.807

0.925

0.612

0.961

LPIPS↓

0.111

0.251

0.151

0.416

0.074

10%

PSNR↑

12.804

10.354

5.832

16.928

24.683

SSIM↑

0.829

0.652

0.278

0.527

0.836

LPIPS↓

0.289

0.248

0.469

0.46

0.198