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28 June 2006 Calibration method with separation patterns of a single-camera
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Abstract
Such as in LAMOST (Large Sky Area Multi-Object Fiber Spectroscopy Telescope), many photometric measurement systems need to reach sub-pixel accuracy with area scan CCD camera. The separation patterns are used to calibrate a single-camera with high precision. Several separation calibration patterns with small size are put on the position of object plane of the camera. Each pattern has some spot array with high precision. The position of each reference point on the image plane of the camera is calculated. The coordinates of the reference points on the calibration patterns are used to calibrate the camera. The curved-surface fitting method is applied to fit the perspective relationship between the object plane and the image plane. The integer pattern with large dimension can be replaced by the several small differential patterns in the situation of large field. The difficulty to manufacture the large pattern is avoided. The experimental results show that the mean value of residual error is less than 0.002mm with the separation calibration method.
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Weimin Li, Jiaru Chu, Hao Meng, Jianping Wang, Xiaofeng Li, and Xiaozheng Xing "Calibration method with separation patterns of a single-camera", Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 62695I (28 June 2006); https://doi.org/10.1117/12.662268
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