Research Article
Two-Layer Fragile Watermarking Method Secured with Chaotic Map for Authentication of Digital Holy Quran
Table 3
Known acceptable value in image quality measurement.
| | Number | Image quality measurement | Known acceptable value |
| | 1 | Peak signal-to-noise ratio (PSNR) | ≥42 dB, greater than or equal to 42 db is better | | 2 | Universal image quality index | ~1.0, near to 1.0 is perfect | | 3 | Signal-to-signal noise ratio (SNR) | ≥20 dB, greater than or equal to 20 db is better | | 4 | Structural similarity (SSIM) | ~1.0000, near to 1.0000 is perfect | | 5 | Normalized Hamming distance (NHD) | =1, equal to 1 is perfect |
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