Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Five-point rating scale comparing test image with reference image.
| Score | Description |
|---|---|
| +2 | Image quality is exceptionally better than the reference image |
| +1 | Image quality is slightly better than the reference image |
| 0 | Equal image quality to the reference image |
| −1 | Image quality is slightly worse than the reference image |
| −2 | Image quality is exceptionally worse than the reference image |
