An Image Processing System for a Multi-Function Astronomical Theodolite

Zhang Yigong; Li Binhua; Yang Lei; Cheng Xiangming

Astronomical Research and Technology > 2014 > 11(1): 65-71.

Zhang Yigong, Li Binhua, Yang Lei, Cheng Xiangming. An Image Processing System for a Multi-Function Astronomical Theodolite[J]. Astronomical Research and Technology, 2014, 11(1): 65-71.

Citation:

Zhang Yigong, Li Binhua, Yang Lei, Cheng Xiangming. An Image Processing System for a Multi-Function Astronomical Theodolite[J]. Astronomical Research and Technology, 2014, 11(1): 65-71.

Citation:

Zhang Yigong, Li Binhua, Yang Lei, Cheng Xiangming. An Image Processing System for a Multi-Function Astronomical Theodolite[J]. Astronomical Research and Technology, 2014, 11(1): 65-71.

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An Image Processing System for a Multi-Function Astronomical Theodolite

1.
College of Information Engineering and Automation, University of Science and Technology of Kunming, Kunming 650500, China
2.
Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
3.
Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Science, Kunming 650011, China

More Information

Received Date: December 28, 2012
Revised Date: January 13, 2013
Published Date: January 14, 2014

Graphical Abstract

Abstract

Abstract

A new Multi-Function Astronomical Theodolite has been built in the Yunnan Observatory.Its main imaging device is a digital CCD camera without cooling.This paper presents an image processing system for the Multi-Function Astronomical Theodolite.The system is used to determine the centers of the stellar profiles in images obtained by the theodolite.The algorithm of the image-processing system includes two main parts, for searching the star and centering the star (object-centering), respectively.An image obtained with this instrument is unusual as it includes only one star.This makes it possible to adopt an efficient searching algorithm for the system.This is to smooth the image with a suitable method, then find the maximum-value pixel as the initial location of the center of the star.After comparing commonly used centering methods in astrometry for the adaptability, accuracy, calculation amount, and programming difficulty, we decide to use the method of two-dimensional modified moments as the object-centering method.The paper shows a block diagram of the image processing system and a program flowchart of the corresponding software written in the VC++.The paper also shows the main design of the program, a screenshot of the user interface of the software, and results of using the object-centering method to a star, an artificial stellar profile, and an aperture profile (which is through the axis collimator on the instrument).The paper finally presents a brief analysis of these results.
- Multi-Function Astronomical Theodolite,
- Image processing system,
- Programming,
- Algorithm,
- Object-centering

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References (22)

References

[1]	冒蔚, 季凯帆, 李彬华, 等. CCD天体测量学[M]. 昆明:云南科技出版社, 2003.
[2]	Stone R C, Monet D G, Monet A K B, et al. The flagstaff astrometric scanning transit telescope(FASTT)and star positions determined in the extragalactic reference frame[J]. The Astronomical Journal, 1996, 111(4):1721-1742.
[3]	Viateau B, Réquième Y, Le Campion J F, et al. The Bordeaux and Valinhos CCD meridian circles[J]. Astronomy and Astrophysics Supplement, 1999, 134:173-186.
[4]	Lopes P A A, Andrei A H, Puliaev S P, et al. Observations of radio stars at the Valinhos CCD meridian circle[J]. Astronomy and Astrophysics Supplement, 1999, 136:531-537.
[5]	李彬华. 低纬度子午环控制系统及数据预处理系统的研究[D]. 昆明:中国科学院云南天文台, 2002.
[6]	Auer L H. The stellar atmospheres problem[J]. Journal of Quantitative Spectroscopy and Radiative Transfer, 1971, 11(6):573-587.
[7]	van Altena W F, Auer L H. Digital Image Centering, I.[C]//Image Processing Techniques in Astronomy. Dordrecht:Astrophysical and Space Science Library, 1975:411-418.
[8]	季凯帆. CCD在天体测量中的应用及数字星像处理方法[D]. 昆明:中国科学院云南天文台, 1993.
[9]	Stone R C. Positions for the outer planets and many of their satellites. IV. FASTT observations taken in 1999-2000[J]. The Astronomical Journal, 2000, 120:2124-2130.
[10]	季凯帆, 王锋. CCD图像的二维修正矩定心方法[J]. 天文学报, 1996, 37(1):85-90. Ji Kaifan, Wang Feng. Two dimensional modified moment centering algorithm in CCD images[J]. Acta Astronomica Sinica, 1996, 37(1):85-90.
[11]	Lu C L. Digital image centering with the maximum likelihood method[J]. Astronomy and Astrophysics, 1993, 275:349-352.
[12]	Sato I, Yoshizawa M. Filtering theory with orthogonal function for two-dimensional astrometry[J]. Astronomy and Astrophysics Supplement Series, 1995, 113:185-197.
[13]	Stone R C. Positions for the outer planets and many of their satellites. V. FASTT observations taken in 2000-2001[J]. The Astronomical Journal, 2001, 122:2723-2733.
[14]	Peng Q Y. Image-processing techniques in precisely measuring positions of saturn and its satellites[J]. Science in China Series G:Physics, Mechanics and Astronomy, 2003, 46(4):362-370.
[15]	李展, 彭青玉, 韩国强. CCD图像数字定心算法的比较[J]. 天文学报, 2009, 50(3):340-348. Li Zhan, Peng Qingyu, Han Guoqiang. Comparison of digital centering algorithms based on CCD images[J]. Acta Astronomical Sinica, 2009, 50(3):340-348.
[16]	Li B H, Yang L, Mao W, et al. Automatic processing method for astronomical CCD images[C]//Proceedings of SPIE, 2002, 4847:305-312.
[17]	Stone R C. A comparison of digital centering algorithms[J]. The Astronomical Journal, 1989, 97(4):1227-1237.
[18]	Mao W, Li B H, Yang L, et al. Constructing an observational model of the neutral atmospheric refraction delay from measured values of the astronomical refraction[J]. The Astronomical Journal, 2007, 134(5):2054-2060.
[19]	Mao W, Zhang H W, Li B H, et al. A possible means of improving the accuracy of refraction delay correction of neutral atmosphere[J]. Chinese Astronomy and Astrophysics, 2007, 31(2):211-220.
[20]	铁琼仙, 林辉, 杨磊, 等. 建立经纬度异常变化三角监测网的仪器和误差的测定[J]. 天文研究与技术——国家天文台台刊, 2008, 5(4):360-364. Tie Qiongxian, Lin Hui, Yang Lei, et al. The instruments and instrumental-error evaluation method for the triangular monitoring network of abnormal changes in the longitude and latitude of an observing station[J]. Astronomical Research & Technology——Publications of National Astronomical Observatories of China, 2008, 5(4):360-364.
[21]	胡辉, 苏有锦, 付红, 等. 大姚、普洱地震前云南天文台时纬残差异常[J]. 自然灾害学报, 2007, 16(5):106-110. Hu Hui, Su Youjin, Fu Hong, et al. Anomalies in time-latitude residuals at Yunnan Observatory before Dayao and Puer earthquakes[J]. Journal of Natural Disasters, 2007, 16(5):106-110.
[22]	Li B H, Zhang Y G, Yang L, et al. Image acquisition system with three CCD cameras[C]//Proceeding of SPIE, 2012, 8451:84512Y.

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