Single face with threading only works with face present at start

[teganscott]

In threaded single-face mode (not yet tested in non-threading), if software loads with no face facing the camera, OpenFace thinks there is always a face that is active even though none are present. This stops OpenFace being able to detect new faces as single-face limits it to only one.

How to test:

• Start software

• As loading look at camera

• OpenFace should behave as expected

• Start software

• Do not look at camera on load

• OpenFace will not detect any actual faces

[LingDong-]

Hey Tegan I'm not able to reproduce your problem with latest version of the quick branch.
See this video test:

https://www.flickr.com/photos/144289998@N07/44010523815/in/shares-149A4b/

^ I think the face detection shows up as expected.

From what you describe it is possible that OpenFace is seeing something else that resembles a face in the scene when you start the app. In this case you can use oft.openFace.face.certainty > 0.2 to filter out the unlikely detections. However, this should not prevent OpenFace from switching to another, real face later. Maybe try blocking out the region of the false-positive with an object, and I think the detection will snap to the actual face. (If the goal is to detect a real face in a room full of face-like objects with single-face mode, then we need use some hacks :)

[teganscott]

Dug a little deeper, it looks like when in single face mode the active face is always set to true. Based on your suggestion I've changed it to only use a face based on the certainty value, not if the active boolean is true.

Thanks for your help!