Figure 23

(a) and (b) Lena and Peppers watermarked images with 256 × 256 watermark image as shown in Figure 11(b) after Scaling (1/2), (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 Scaling (1/2), (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 Scaling (1/2), (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 Scaling (1/2), (o) and (p) the extracted watermarks with size 256 × 256 from (k) and (l), respectively. (a)PSNR = 33.94 dB (b)PSNR = 31.85 dB (c)PSNR = 31.85 dB (d)PSNR = 29.29 dB (e)γ = 0.9528 (f)γ = 0.9402 (g)γ = 0.8835 (h)γ = 0.8860 (i)PSNR = 34.06 dB (j)PSNR = 31.93 dB (k)PSNR = 31.79 dB (l)PSNR = 29.26 dB (m)γ = 0.9462 (n)γ = 0.9142 (o)γ = 0.8651 (p)γ = 0.8702