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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