Table 4 Content-preserving operations with given parameter values
From: Robust image hashing using ring partition-PGNMF and local features
Tool | Manipulation | Parameter | Parameter values |
|---|---|---|---|
Stir Mark | JPEG compression | Quality factor | 30, 40, 50, 60, 70, 80, 90, 100 |
Stir Mark | Watermark embedding | Strength | 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 |
Stir Mark | Scaling | Ratio | 0.5, 0.75, 0.9, 1.1, 1.5, 2.0 |
Stir Mark | Rotation and Cropping | Rotation angle in degree | 1, 2, 5, 10, 15, 30, 45, 90, −1, −2, −5, −10, −15, −30, −45, −90 |
Photoshop | Brightness adjustment | Photoshop Scale | 10, 20, −10, −20 |
Photoshop | Contrast Adjustment | Photoshop Scale | 10, 20, −10, −20 |
Matlab | Gamma Correction | Y | 0.5, 0.75, 0.9, 1.1, 1.5 |
Matlab | 3 × 3 Gaussian low pass filter | Standard deviation | 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1 |