研究人员通常将镜头转换分为突变和渐变，并根据各种转换的特点采用不同的检测算法。
Researchers usually classify scene changes as abrupt or gradual and develop respective algorithms to detect them.
镜头的转换方式分为切变和渐变，本文对镜头的切变和渐变中的淡入淡出检测分别做了研究。
The methods of shot change include abrupt change and gradual change, this thesis researches shot abrupt change detection and fade-in and fade-out of gradual change detection.
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