Recognizing object larger than camera FOV

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I need to recognize an object that is larger than the camera FOV. It is moving through the frame from side to side at close proximity to the camera. I want to trigger an event when the object is centered in front of the camera, so I need an approximate center point. Right now, I'm using an lbp cascade that works very well when the whole object is in the frame. My guess would be to train several cascades that recognise specific parts of the object, but I'm interested in other ideas.