这看起来就像是背景图像扩大到整个区域。
It appears as if the background graphic expands to fill the region.
在头脑中，始终要有这样的认识：背景图像只是显示一个可供内容填充的有效空间(即内容区域和padding，称为doorway)。
Keep in mind that background images only show in the available "doorway" of the element to which they're applied (content area + padding).
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。
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.
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