I've got a set of 10 standard faces. I need an algorithm for matching any face to the face from reference set. Please note, changes in the given face shouldn't lead to the changes in matching.
E.g. I have three photos of the same person:
1) usual photo
2) photo with smile
3) photo with beard
Algorithm have to match all of photos to the same reference face.
Photo contains frontal face.
Usage of OpenCV is ok.