For astrometric purposes , dark frame and flat field calibration is recommended.

出于天文测量要求, 暗场图和平场图校准是被推荐的.

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A flat field calibration is automatically applied to all CCD Images that are loaded thereafter.

此后载入的所有CCD图片将针对此平场图片做校正.

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This paper describes a useful method for phasor measurement unit ( PMU ) field calibration.

介绍了一种实用的相量测量装置 ( PMU ) 的现场校核方法.

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