The scenes and contents of printing video almost describes the operation, usage and running of printing machines. Based on these features of printing video, this paper introduces some approaches of key-frame extraction. In commonly used traditional algorithms, key-frame extraction algorithms based on average histogram and based on shot boundary are described in detail. Moreover, this paper proposes a novel approach of key-frame extraction based on average frame-difference. The experimental results indicate that the new approach is very effective and efficient for extracting key-frames of printing video.
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