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Table 2 Comparing BER (%) of Wang’s method [21] and our method under different types of attacks, (message length = 256 bits, PSNR = 42 dB)

From: Optimal watermark embedding combining spread spectrum and quantization

Image

Method

Median filter

JPEG

AWGN

Salt & pepper

  

3×3

QF=11

σ n =10

p s =1 %

Peppers

Wang [21]

29.35

26.10

1.25

2.00

Peppers

Ours

0.78

0.78

0.78

0.78

Baboon

Wang [21]

31.65

16.95

1.30

1.95

Baboon

Ours

7.03

3.91

0.78

1.56

Barbara

Wang [21]

24.95

16.45

1.45

2.25

Barbara

Ours

3.13

3.52

0.39

2.34

Lena

Wang [21]

30.80

29.80

1.45

2.45

Lena

Ours

0

1.17

0

0.78