Table 3 Bit error rate (BER) values of the extracted watermarks obtained for other types of attacks, and at each DWT level 
.
.From: Time-Frequency and Time-Scale-Based Fragile Watermarking Methods for Image Authentication
Attacks | Example: Lena image | ||
|---|---|---|---|
| Â |
|
|
|
No attacks | 0 | 0 | 0 |
Histogram equalization | 0 | 0.0728 | 0.4587 |
Sharpening | 0.0068 | 0.1880 | 0.4802 |
Blurring | 0.0313 | 0.2847 | 0.4832 |
Gaussian noise | 0.0781 | 0.3413 | 0.5034 |
Salt-and-pepper noise | 0.1357 | 0.4214 | 0.4995 |
