First, it builds the background model by observing the scene without people in it.

在检测开始之前，首先由摄像机对无人环境持续观测一段时间，建立背景的统计模型；

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First, it builds the background model by observing the scene without people in it.

在检测开始之前，首先由摄像机对无人环境持续观测一段时间，建立背景的统计模型；

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