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Table 1 The SNR, MSSIM of the restored "Lena" images by using four models. The numbers in the bracket under the "MSSIM" column refer to the total iteration number of the algorithm.

From: Image Variational Denoising Using Gradient Fidelity on Curvelet Shrinkage

Noise standard

Noisy image

Curvelet shrinkage method

"TV" Model

"TVGF" Model

Proposed model

deviation

SNR (dB)

MSSIM

SNR (dB)

MSSIM

SNR (dB)

MSSIM

SNR (dB)

MSSIM

SNR (dB)

MSSIM

20

7.59

0.34

16.62

0.86

16.76

0.85 (1923)

15.68

0.82 (969)

17.26

0.88 (486)

25

5.63

0.27

15.70

0.84

15.68

0.82 (2290)

14.75

0.77 (1115)

16.36

0.86 (615)

30

4.04

0.22

14.95

0.82

14.81

0.80 (2991)

13.79

0.71 (1135)

15.58

0.85 (763)

35

2.70

0.18

14.29

0.81

13.92

0.76 (3000)

12.88

0.67 (1142)

14.92

0.84 (898)

40

1.54

0.15

13.72

0.79

12.94

0.71 (3000)

12.01

0.61 (1151)

14.36

0.82 (1033)