Figure 20

(a) and (b) Lena and Peppers watermarked images with 256 × 256 watermark image as shown in Figure 11(b) after Bluring with radius 3, (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 Bluring, (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 Bluring, (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 Bluring, (o) and (p) the extracted watermarks with size 256 × 256 from (k) and (l), respectively. (a)PSNR = 29.12 dB (b)PSNR = 28.81 dB (c)PSNR = 24.66 dB (d)PSNR = 23.89 dB (e)γ = 0.9407 (f)γ = 0.9404 (g)γ = 0.8287 (h)γ = 0.8830 (i)PSNR = 29.14 dB (j)PSNR = 28.83 dB (k)PSNR = 24.65 dB (l)PSNR = 23.88 dB (m)γ = 0.9191 (n)γ = 0.9215 (o)γ = 0.7743 (p)γ = 0.8701