Figure 17

(a) and (b) Lena and Peppers watermarked imageswith 256 × 256 watermark image as shown in Figure 11(b) after adding Gaussian noise with mean = 0 and variance = 0.002, (e) and (f) the extracted watermarks with size 256 × 256 from (a) and (b), respectively. (c) and (d) Crowd and Baboon watermarked images with 128 × 128 watermark image as shown in Figure 11(b) after adding Gaussian noise. (g) and (h) The extracted watermarks with size 128 × 128 from (c) and (d), respectively. (i) and (j) Lena and Peppers watermarked images with 128 × 128 watermark image as shown in Figure 11(d) after adding Gaussian noise, (m) and (n) the extracted watermarks with size 128 × 128 from (i) and (j), respectively. (k) and (l) Crowd and Baboon watermarked images with 256 × 256 watermark image as shown in Figure 11(d) after adding Gaussian noise. (o) and (p) The extracted watermarks with size 256 × 256 from (k) and (l), respectively. (a)PSNR = 26.95 dB (b)PSNR = 27.08 dB (c)PSNR = 27.08 dB (d)PSNR = 26.96 dB (e)γ = 0.6630 (f)γ = 0.6474 (g)γ = 0.7975 (h)γ = 0.7497 (i)PSNR = 26.98 dB (j)PSNR = 27.08 dB (k)PSNR = 27.07 dB (l)PSNR = 26.94 dB (m)γ = 0.7032 (n)γ = 0.7643 (o)γ = 0.6143 (p)γ = 0.6070