From: Robust image hashing through DWT-SVD and spectral residual method
Operation | Description | Tool | Parameter value | Number of images |
---|---|---|---|---|
Brightness adjustment | Photoshop’s scale | Photoshop | ±10, ±20 | 4 |
Contrast adjustment | Photoshop’s scale | Photoshop | ±10, ±20 | 4 |
Gamma correction | γ | MATLAB | 0.75,0.9,1.1,.25 | 4 |
Gaussian low pass filtering | Standard deviation | MATLAB | 0.3–1.0 | 8 |
Salt and Pepper noise | Density | MATLAB | 0.001–0.01 | 10 |
Speckle noise | Variance | MATLAB | 0.001–0.01 | 10 |
JPEG compression | Quality factor | StirMark | 30–100 | 8 |
Watermark embedding | Strength | StirMark | 10–100 | 10 |
Scaling | Ratio | StirMark | 0.5,0.75,0.9,1.1,1.5,2.0 | 6 |
Rotation | Angles in degree | StirMark | ±5, ±10, ±15,±30, ±45, ±90 | 12 |
 |  |  | Total : | 76 |