The Animetrics Face Recognition API can be used to detect human faces in pictures and match them against a known set of faces. Information on facial features or "landmarks" is returned as coordinates on the image. Animetrics Face Recognition will also detect and return the orientation, or "pose" of faces along 3 axes.
You may give the api a test drive below, or sign up for an API key for further access. For more information, please refer to the API documentation.