| Line Extraction with the Use of an Automatic Gradient Threshold Technique and the Hough Transform Recent countries visiting this post |  |
 | 5 | United States |
 | 2 | China |
 | 1 |
| Line Extraction with the Use of an Automatic Gradient Threshold Technique and the Hough Transform Recent countries visiting this post | |
| 5 | United States |
| 2 | China |
| 1 |