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Figure 18 | EURASIP Journal on Advances in Signal Processing

Figure 18

From: A New Robust Watermarking Scheme to Increase Image Security

Figure 18

(a) and (b) The Lena and Peppers watermarked images with 256 × 256 watermark image as shown in Figure 11(b) after performing Gaussian lowpass 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 Gaussian lowpass 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 Gaussian lowpass 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 Gaussian lowpass filter, (o) and (p) the extracted watermarks with size 256 × 256 from (k) and (l), respectively. (a)PSNR = 33.25 dB (b)PSNR = 32.28 dB (c)PSNR = 30.11 dB (d)PSNR = 28.67 dB (e)γ = 0.8948 (f)γ = 0.8994 (g)γ = 0.7074 (h)γ = 0.7940 (i)PSNR = 33.33 dB (j)PSNR = 32.34 dB (k)PSNR = 30.07 dB (l)PSNR = 28.64 dB (m)γ = 0.8646 (n)γ = 0.8598 (o)γ = 0.6502 (p)γ = 0.7751

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