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Face Detection detects faces and returns their location.
Face Recognition identifies people by comparing detected faces to faces in your training database.
After detecting faces, Media Server can also:
Media Server can analyze faces for demographics and facial expression only when the person is looking directly at the camera.
You can run face detection and face analysis operations out-of-the-box. To run face recognition, you must train Media Server using images of people that you want to identify. For information about how to train Media Server, see Train Media Server to Recognize Faces.