Finally, we do some discussion in key frame extraction and shot cluster.

最后，对关键帧提取和镜头聚类等方面做了一定的探讨。

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During key frame extraction, the concept of image entropy is used after shot being segmented into sub-shots.

在关键帧提取阶段，将镜头分割为子镜头后，引入图像熵的概念提取关键帧。

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The pixel-matching two-difference algorithm and two histogram comparison are used for shot detection, a method of extraction shot key frame based on distance of adjacent frame is presented.

首先使用改进了的像素匹配二次差分法结合双阈值法进行镜头突变和渐变的检测，然后对镜头内的帧间距离进行判断来提取关键帧；

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