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.gov website belongs to an official
government organization in the United States.
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) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Facial action units (AU) output by OpenFace.
| AU number | Description |
| 1 | Inner brow raiser |
| 2 | Outer brow raiser |
| 4 | Brow lowerer |
| 5 | Upper lid raiser |
| 6 | Cheek raiser |
| 7 | Lid tightener |
| 9 | Nose wrinkler |
| 10 | Upper lip raiser |
| 12 | Lip corner puller |
| 14 | Dimpler |
| 15 | Lip corner depressor |
| 17 | Chin raiser |
| 20 | Lip stretcher |
| 23 | Lip tightener |
| 25 | Lips part |
| 26 | Jaw drop |
| 45 | Blink |
