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Table 1 Image quality of method 1 (three-level progressive sharing)

From: Progressive sharing of multiple images with sensitivity-controlled decoding

Secret images

Progressive thresholds ( r j1, r j2,r j3)

Image quality of recovery on level 1

Image quality of recovery on level 2

Quality of stego images

PSNR

SSIM

MSE

PSNR

SSIM

MSE

Stego images

PSNR

SSIM

MSE

House

2&3&4

26.29

0.795

152.8

33.06

0.905

32.1

Barbara

39.60

0.975

7.1

Cameraman

2&3&4

24.95

0.787

208.0

30.35

0.897

60.0

Lake

42.00

0.977

4.1

Lena

3&4&5

26.40

0.777

149.0

32.15

0.902

39.6

Couple

41.63

0.972

4.5

Pepper

3&4&5

26.05

0.804

161.5

33.09

0.924

31.9

Baboon

41.22

0.979

4.9

Jet

4&5&6

25.86

0.817

168.7

31.66

0.914

44.4

Indian

41.92

0.971

4.2

Blonde

4&5&6

27.33

0.797

120.2

32.83

0.905

33.9

Bridge

40.50

0.977

5.8

  1. On level 3, the recovery is lossless.