Advances, Systems and Applications
Table 4 PSNR and NC values on the different images after stego-text insertion without any attack
From: Digital image watermarking using discrete cosine transformation based linear modulation
|  | Lena image (640 × 480) | Baboon image (640 × 480) | Peppers image (640 × 480) | Airplane (640 × 480) | ||||
|---|---|---|---|---|---|---|---|---|
Size of stego-text (char) repeated 10 times | PSNR | NC | PSNR | NC | PSNR | NC | PSNR | NC |
20 | 43.36Â dB | 1 | 42.64Â dB | 1 | 43.28Â dB | 1 | 42.48Â dB | 1 |
30 | 43.33Â dB | 1 | 42.63Â dB | 1 | 43.26Â dB | 1 | 42.51Â dB | 1 |
40 | 43.31Â dB | 1 | 42.63Â dB | 1 | 43.26Â dB | 1 | 42.53Â dB | 1 |
50 | 43.30Â dB | 1 | 42.62Â dB | 1 | 43.25Â dB | 1 | 42.56Â dB | 1 |