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The persistent development of large-scale teaching video highlights the insufficiency of the current teaching
video retrieval. Now, a teaching video retrieval system based on key frame has been designed and achieved. The system
uses mutual information extraction for the video key frame extraction. The feature of key frame uses colour information;
the similarity judgment uses simplified histogram for computation. In case of inquiry and retrieval, such a video retrieval
method as combines key word and key frame is applied. The system had been tested and verified, and the result proves
that the system meets the application requirements.