Reference Stars: Star with known position and/or magnitude, that are used to find the plate constants and photometriccalibration of an image.
参考星：已知位置和/或星等的恒星，用于确定图片的底片常数和光度校准。
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However, there is less method on how to solve the calibration on large complex screen. We summarize recent popular methods on the geometry calibration and photometriccalibration.