How to improve image is always a difficult problem. Generally, the target background of image has some characteristics, such as the low target-to-background contrast, great noise and so on.

如何有效地增强图像是图像分析中的一个难点，通常，图像的目标背景对比度低，噪声大。

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In a point-of-interest map design, everything but the target area falls into the background.

在关键点地图的设计中，除了目标区域，一切都将放到背景中。

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Magnify only the aspects of your background that are relevant to your target objective.

唯一需要放大的是与你的目标有直接关系的方面。

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In the first phase of the study, the researchers showed that their volunteers (Surrey university students) were slower to notice a target shade of blue when it flashed up against a blue background of a different hue than when it flashed up against a green background.

ECONOMIST: Psychology

For example, they say criminals skirt background checks, so expanding the system would miss the main target of the legislation.

CNN: Obama still backs new gun ban; top senator less certain

The background turns from green to yellow as the order nears the target time and to red when it has exceeded it.

NEWYORKER: Big Med