Research Article
Adaptive Robust Blind Watermarking Scheme Improved by Entropy-Based SVM and Optimized Quantum Genetic Algorithm
Table 4
Attacked image and extracted watermark.
| | Attack type | JPEG (QF = 20) | JPEG (QF = 50) | JPEG (QF = 70) | JPEG (QF = 90) | Gaussian low-pass filtering (3, 0.5) |
| | Attacked image | | | | | | | Extracted watermark | | | | | | | Attack type | Histogram | | | | | | | equalization | Image darken | Contrast decreasing | Guassian noise (0.003) | Crop (1/4) | | Attacked image | | | | | | | Extracted watermark | | | | | | | Attack type | Salt-pepper noise (0.005) | Salt-pepper noise (0.01) | Rotation (−0.25) | Rotation (0.25) | Image resize (10) | | Attacked image | | | | | | | Extracted watermark | | | | | |
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