Research Article
An Extended DCT Domain Watermarking for Robot Vision against Geometric Image Attacks
Table 1
Comparison with previous studies.
| Content | Method 1A [9] | Method 1B [9] | Proposed method |
| Perceptual invisibility | O | O | O | Robustness | Normal | Normal | High | Clarity | High | High | High | Security | High | High | High | Extraction without original copy | O | O | O | Number of inserted watermark | 1 | 2 | 16 | Inverse transform | X | X | O | Speed | Fast | Fast | Slow |
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