Table 5 Quality assessment using the mean square error (MSE) and the signal-to-noise ratio (SNR) of the extracted watermark signal, when the watermarked Lena image is JPEG compressed, using various compression quality factor values.
From: Time-Frequency and Time-Scale-Based Fragile Watermarking Methods for Image Authentication
JPEG Comp. | Actual PSNR | Quality Assessment | |
|---|---|---|---|
(QF) | (dB) | MSE | SNR (dB) |
100% | 45.97 | 2.0025 | 46.98 |
99% | 45.35 | 5.1460 | 32.89 |
98% | 44.41 | 0.0014 | 28.69 |
95% | 41.53 | 0.0101 | 19.95 |
90% | 38.83 | 0.0267 | 15.74 |
80% | 35.94 | 0.0641 | 11.93 |
70% | 34.41 | 0.0956 | 10.19 |
60% | 33.34 | 0.1061 | 9.74 |
50% | 32.56 | 0.1227 | 9.11 |
