| Structure Tensor of Colour Quaternion Image Representations for Invariant Feature Extraction Recent countries visiting this post |  |
 | 11 | United States |
 | 1 | Russian Federation |
 | 1 | France |
 | 1 |
| Structure Tensor of Colour Quaternion Image Representations for Invariant Feature Extraction Recent countries visiting this post | |
| 11 | United States |
| 1 | Russian Federation |
| 1 | France |
| 1 |