Research Article
An Efficient Image Watermarking Method Based on Fast Discrete Cosine Transform Algorithm
Table 3
Robustness of the watermarking method against image cropping and data compression.
| Image attack on watermarked image | Retrieved watermark |
| 5% cropping at the upper right area | | | 15% cropping from the upper right to the lower left | | | 1/4 data compression on the watermarked image | | |
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