问题:

I'm interested in writing software that depends on being able to identify that there is a face in a picture (or video frame). It doesn't have to ID the face - so no metrics other than:

Is there a human face in the picture (or more than one)
Where, approximately, are the eyes and mouth or nose tip (whatever it keyed on.)

It's popping up in cheap digital cameras now, so I expect there are open source packages that do this, or research that is easy enough to follow when rolling your own.

回答1:

Check out the OpenCV library, here is a link for a good wiki about it.

And here you can see a sample program of implementing a face recognition app.

回答2:

Face Recognition is defined as the problem of matching a given unknown face image to a set of known face images. What you are looking for is Face Detection, google it and you should find plenty.