Key frame extraction is very important for video data processing. This paper mainly studies how to extract the key frames of the video data when transforming the medical action video data into image data, so as to process and mine the medical action video data with image processing technology in the later period. Because of the difference of the doctor for some special action concerns, the existing algorithm of key frames can not extract the important frames selected by the doctors exactly, so this paper will review the traditional method to extract key frames, and use a new method of key frame extraction (multi-frame dimensionality-reduction difference method) to extract the key actions that clinical doctors pay attention to. Compared with the traditional method, this method can extract the frame image concerned by the doctor better.
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