| Two-stage image denoising by principal component analysis with local pixel grouping Recent countries visiting this post |  |
 | 6 | United States |
 | 3 | |
 | 3 | Taiwan |
| Two-stage image denoising by principal component analysis with local pixel grouping Recent countries visiting this post | |
| 6 | United States |
| 3 | |
| 3 | Taiwan |