前者以“岸”为前景，后者以“圈”为象征，所说的却都是圆形运动。
The former assumes the bank as its foreground, while the latter the circle as a symbol.
如同在任何项目中，首要的任务是为工作产品为前景文档的再造工程系统开发一个表示。
As in any project, the first task is to develop a vision for the reengineered system whose work product is the vision document.
背景差分法是一种重要的运动目标分割方法，但是其不仅对背景质量的要求较高，且易将运动阴影误检测为前景目标。
The background difference is important for segmenting mobile objects. But this method highly depends on background quality and easily regards moving shadows as objects.
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