Table 1 Similarity measure between the TFD of the original watermark and that of the extracted watermark, when the watermarked image is subjected to various attacks.
From: Time-Frequency and Time-Scale-Based Fragile Watermarking Methods for Image Authentication
Type of Attack | Correlation coefficient, |
|---|---|
Scaling (factor 1.1) |
|
Translation |
|
Rotation(1 degree) |
|
Cropping |
|
JPEG (QF = 99%) | 0.2027 |
0.0027
0.0453
0.0072
0.0094