Figure 19

(a) and (b) Lena and Peppers watermarked images with 256 × 256 watermark image as shown in Figure 11(b) after performing Average filter with window size 5 × 5, (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 performing Average filter, (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 performing Average filter, (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 performing Average filter, (o) and (p) the extracted watermarks with size 256 × 256 from (k) and (l), respectively. (a)PSNR = 29.60 dB (b)PSNR = 29.08 dB (c)PSNR = 25.31 dB (d)PSNR = 24.34 dB (e)γ = 0.8577 (f)γ = 0.8621 (g)γ = 0.6194 (h)γ = 0.7174 (i)PSNR = 29.63 dB (j)PSNR = 29.11 dB (k)PSNR = 25.30 dB (l)PSNR = 24.33 dB (m)γ = 0.8172 (n)γ = 0.8074 (o)γ = 0.5654 (p)γ = 0.6998