The background sound of an environment in relation to which all foreground sounds are heard, such as the 'silence' of an empty room, conversation in a restaurant, or the stillness of a forest.

环境的背景声音指的是所有可听到的突出声音，比如空房间里的“静默之声”，餐馆里的谈话，或者森林里的沉寂。

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The foreground extraction method is quite suitable for picking up the target contour of the background image in a fixed area, such as monitoring of the surrounding environment of an ATM and the like.

本发明非常适合于固定区域的背景图像中提取目标轮廓，如ATM机周边环境的监控等。

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