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Video key frame detection
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Frame-by-frame to identify key points of the video. Key points in order to speed up detection, using key points in adjacent frames have changed little, by comparing the area around point location of the image to update the key point of the block, key points of succession to prevent any more calculated. One starting point is detected by SIFT. There are two methods: each of a certain number of frames, then SIFT to recalculate the key points, delivering key points, image grayscale values of a key point of difference between a choice point. Another is that using the image of a critical point block of gray values whether the average of the difference exceeds a certain threshold, to decide whether or not to SIFT calculation key points.
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