10. The computer-implemented method of claim 7 wherein each specialized recognition engine is specialized over a range of at least +/−ten degrees with respect to at least one of Euler angles (yaw, pitch).
7. A computer-implemented method for training a plurality of specialized recognition engines to recognize a preselected attribute of a facial image, wherein each specialized recognition engine is specialized for a different range of head poses, the method comprising repeating the computer-implemented method of claim 1 for each of the plurality of specialized recognition engines.