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Table 2 The content-preserving activities on image

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