Study about distortion measurement of NFOV lens based on star point method

XV Wei-xing; QIAO Wei-dong; YANG Jian-feng; GE Wei; XUE Bin; MA Li-hua

doi:10.3969/j.issn.1001-3806.2011.05.005

LASER TECHNOLOGY > 2011 > 35(5): 593-595,643. > DOI: 10.3969/j.issn.1001-3806.2011.05.005

XV Wei-xing, QIAO Wei-dong, YANG Jian-feng, GE Wei, XUE Bin, MA Li-hua. Study about distortion measurement of NFOV lens based on star point method[J]. LASER TECHNOLOGY, 2011, 35(5): 593-595,643. DOI: 10.3969/j.issn.1001-3806.2011.05.005

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Study about distortion measurement of NFOV lens based on star point method

1.
Spectral Imaging Technique Laboratory, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an710119, China;
2.
Graduate University, Chinese Academy of Sciences, Beijing 100039, China;
3.
Telecommunication Engineering Institute, Air Force Engineering University, Xi'an 710051, China

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Received Date: November 16, 2010
Revised Date: January 05, 2011
Published Date: September 24, 2011

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Abstract

Abstract

In order to measure the distortion of the narrow field of view (NFOV) lens by means of star point method, both star point center orientation and star size, affecting the accuracy of the distortion measurement, were studied. First of all, in order to improve the star positioning accuracy, Otsu algorithm and the barycenter calculation were combined to calculate the location of star point. At the same time, the calculated results were compared with the traditional centroid algorithm. Then, the effect of the star size on the stability of the star point positioning was analyzed in the experiments. Finally, the absolute and relative distortion of the lens was measured for the star points whose mean square error of coordinates is 1/71 pixel. The results show that the distortion of the NFOV lens can be measured with high precision and this method can meet space application.
- image processing,
- narrow field of view,
- distortion measurement,
- gravity calculation,
- Otsu algorithm,
- star choice

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