Figure 22

(a) and (b) Lena and Peppers watermarked images with 256 × 256 watermark image as shown in Figure 11(b) after applying Median 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 appling Median 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 appling Median 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 appling Median filter, (o) and (p) the extracted watermarks with size 256 × 256 from (k) and (l), respectively. (a)PSNR = 31.17 dB (b)PSNR = 32.08 dB (c)PSNR = 26.46 dB (d)PSNR = 24.60 dB (e)γ = 0.8768 (f)γ = 0.8818 (g)γ = 0.6537 (h)γ = 0.5993 (i)PSNR = 31.22 dB (j)PSNR = 32.14 dB (k)PSNR = 26.48 dB (l)PSNR = 24.59 dB (m)γ = 0.8426 (n)γ = 0.8476 (o)γ = 0.6247 (p)γ = 0.6046