A Comparison of Several Image Locating Algorithms in Astronomical Instruments |
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Authors: | Wang Li-li Hu Zhong-wen Ji Hang-xin |
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Institution: | 1. Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing 210042;2. Key Laboratory of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing 210042;3. Graduate University of Chinese Academy of Sciences, Beijing 100049 |
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Abstract: | In astronomical observations at optical wavelengths, a fast image tracking system can be adopted to reduce the effects of the atmospheric seeing and telescopic tracking error, and therefore improve the observing efficiency. Aiming at the need of astronomical observations, totally 5 kinds of algorithms in two categories were selected to make a comparative study on their accuracies and stabilities under different noise conditions by both numerical experiment and laboratory test. The results indicate that the normalized cross-correlation method and barycenter method have not only a higher accuracy but also a better reliability against interferences, they will be applied to the high-resolution spectrograph of the Xinglong 2.16 m telescope and the scienti?c instruments of the SONG (Stellar Observations Network Group) project, respectively. |
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Keywords: | Telescopes&mdash techniques Image processing&mdash techniques Numerical&mdash techniques Laboratory |
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