Volume 9 Issue 4
Jul.  2016
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Article Contents
WANG Hao-jing, WU Liang, WANG Jian-li, ZHANG Shi-xue, YANG Qing-yun. Low SNR star detection by shift-and-add method in daytime[J]. Chinese Optics, 2016, 9(4): 405-414. doi: 10.3788/CO.20160904.0405
Citation: WANG Hao-jing, WU Liang, WANG Jian-li, ZHANG Shi-xue, YANG Qing-yun. Low SNR star detection by shift-and-add method in daytime[J]. Chinese Optics, 2016, 9(4): 405-414. doi: 10.3788/CO.20160904.0405

Low SNR star detection by shift-and-add method in daytime

doi: 10.3788/CO.20160904.0405
Funds:

National Defense Science and Technology Innovation Fund Project No.CXJJ-10-M53

More Information
  • Corresponding author: E-mail:wanghaojing@vip.qq.com
  • Received Date: 24 Mar 2016
  • Rev Recd Date: 28 Apr 2016
  • Publish Date: 01 Aug 2016
  • In order to accurately calculate star's centroid and energy in infrared electro-optical measuring system in daytime for low SNR star, an efficient method is presented. Firstly, according to the optical characteristics of electro-optical measuring system, the imaging characteristics of stars during the day are analyzed. Secondly, in order to obtain pre-processing sequence, these operations, which include non-uniformity correction, bad point's correction and background subtraction, are performed orderly in the acquired image sequence. Then a down-sampled image is got by performing image-stacking and down-sampling operation in the pre-processing sequence. Stellar suspected position is obtained by brightness characteristics in the down-sampled image, and a target area is located at stellar corresponding suspected position in the pre-processing sequence, then centroid sequence is extracted from the pre-processing sequence inside the target area. The sub images inside target area whose center is at the centroid are shifted and averaged to get a target sub image. Star extraction, centroid extraction and energy calculation are performed in the target image by stellar SNR criterion. Thirdly, the principle of this method to improve target SNR is revealed, its scope of application and the ways to determine the relevant parameters are analyzed. Experimental results indicate that the proposed shift-and-add method can improve target SNR and the extraction accuracy, for stars with SNR less than 4.8, its centroid extraction and energy calculation accuracy are increased by 0.06 pixel and 28.5% in average, respectively. Thus the shift-and-add method can achieve more accurate calculation of centroid and energy for low SNR star.

     

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