21. The at least one machine readable medium of claim 20 , wherein generating the semantic model includes creating a generative model from the frames mapped to the pseudo-semantic domain.
21. The at least one machine readable medium of claim 20 , wherein generating the semantic model includes creating a generative model from the frames mapped to the pseudo-semantic domain. 22. The at least one machine readable medium of claim 21 , wherein creating the generative model includes recursively identifying a set of key frames in the frames by adding a frame with a highest score to the set of frames, the score of a frame being the inverse of the sum of a square norm of the coordinate of the frame multiplied by a constant and divided by the square of the norm of the distance between the frame and a frame in the set of key frames for all members of the set of key frames.