After analyzing why the focal length changes, I give an automatic focus algorithm controlled by computer.
对自动聚焦问题，分析了焦距变化的原因，给出了计算机控制的自动聚焦算法。
Therefore, the automatic video analysis system emerges as The Times require, and the research of automatic video classification algorithm also becomes a research focus.
为此，视频的自动分析系统便应运而生。视频的自动分类检测算法研究也成为一个热点。
Therefore, the automatic video analysis system emerges as The Times require, and the research of automatic video classification algorithm also becomes a research focus.
为此，视频的自动分析系统便应运而生。视频的自动分类检测算法研究也成为一个热点。
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