| Illumination and Person-Insensitive Head Pose Estimation Using Distance Metric Learning Recent countries visiting this post |  |
 | 8 | United States |
 | 6 | |
 | 1 | China |
| Illumination and Person-Insensitive Head Pose Estimation Using Distance Metric Learning Recent countries visiting this post | |
| 8 | United States |
| 6 | |
| 1 | China |