Measurement for LOS stabilization accuracy of electro-optical imaging system on moving carrier
| Autor: | 孙丽娜 Sun Li-na, 郎小龙 Lang Xiao-long, 孙辉 Sun Hui, 李志强 Li Zhi-qiang |
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| Rok vydání: | 2011 |
| Předmět: |
CMOS sensor
Computer science Orientation (computer vision) business.industry System of measurement Image registration Field of view Autocollimator Atomic and Molecular Physics and Optics Displacement (vector) Electronic Optical and Magnetic Materials law.invention Optics Position (vector) law Computer vision Artificial intelligence business |
| Zdroj: | Optics and Precision Engineering. 19:2131-2137 |
| ISSN: | 1004-924X |
| DOI: | 10.3788/ope.20111909.2131 |
| Popis: | A novel measurement scheme for the stabilization accuracy of a Line of Sight(LOS) in an electro-optical imaging system on a moving carrier is proposed.The principle of optical measurement for LOS stabilization accuracy is briefly introduced,and the optical design of an autocollimator with a large field of view and a detection algorithm for the light-spot position are investigated.The autocollimator is used to test orientation changes of the LOS which is represented by a mirror fixed on the frame of the electro-optical imaging system.A high-speed CMOS camera for the collection of images and an algorithm for image registration based on Phase-only Correlation(POC) are employed to detect sub-pixel level displacement of light-spot images by calculation of the normalized cross-power spectrum between pairs of images.The scheme has been used in the LOS stabilization accuracy measurement system,and a calibrating experiment is set up using a Leica theodolite.The experimental results show that the RMS error of the angular measurement is less than 2 μrad when the field of view is ±1° and the sampling rate is 500 frame/s.The dynamic measurement can meet the system requirements of a larger field of view and a greater precision. |
| Databáze: | OpenAIRE |
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