| Perceptual-based quality assessment for audio-visual services: A survey Recent countries visiting this post |  |
 | 8 | United States |
 | 1 | |
 | 1 | Australia |
| Perceptual-based quality assessment for audio-visual services: A survey Recent countries visiting this post | |
| 8 | United States |
| 1 | |
| 1 | Australia |