| Rotation, scaling, and translation-invariant multi-bit watermarking based on log-polar mapping and discrete Fourier transform Recent countries visiting this post |  |
 | 4 | United States |
 | 1 | Germany |
| Rotation, scaling, and translation-invariant multi-bit watermarking based on log-polar mapping and discrete Fourier transform Recent countries visiting this post | |
| 4 | United States |
| 1 | Germany |