| A survey of approaches and challenges in 3D and multi-modal 3D + 2D face recognition Recent countries visiting this post |  |
 | 5 | United States |
 | 3 | |
 | 3 | Greece |
 | 1 | China |
| A survey of approaches and challenges in 3D and multi-modal 3D + 2D face recognition Recent countries visiting this post | |
| 5 | United States |
| 3 | |
| 3 | Greece |
| 1 | China |