| Reconstructing an image from its local descriptors Recent countries visiting this post |  |
 | 42 | United States |
 | 15 | |
 | 9 | France |
 | 6 | China |
 | 6 | Germany |
 | 5 | Czech Republic |
 | 5 | Japan |
 | 4 | Portugal |
 | 3 | Korea, Republic of |
 | 3 | United Kingdom |
 | 2 | Europe |
 | 2 | Algeria |
 | 2 | Russian Federation |
 | 1 | Sweden |
 | 1 | Switzerland |
 | 1 | Taiwan |
 | 1 | Turkey |
 | 1 | Italy |