| 光谱学与光谱分析 |
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| Geometric Distortion Correction for Hyperspectral Image Using a Rotating Scan Reflector |
| KE Gang-yang1, AN Ning1, TIAN Yang-chao1, MA Zhi-hong2, HUANG Wen-jiang2, WANG Qiu-ping1* |
1. National Synchrotron Radiation Laboratory, University of Science and Technology of China，Hefei 230029, China
2. National Engineering Research Center for Information Technology in Agriculture, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China |
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Abstract Offner imaging spectrometer is a kind of pushbroom imaging system. Hyperspectral images acquired by Offner imaging spectrometers require relative motion of sensor and scene that is translation or rotation. Via rotating scan with a reflector at the front of sensor’s len, large objects can be entirely captured. But for the changes in object distances, geometric distortion occurs. A formula of space projection from an object point to an image point by one capture was derived. According to the projection relation and slit’s motion curve, the object points’ coordinates on a reference plan were obtained with rotation angle for a variable. A rotating scan device using a reflector was designed and installed on an Offner imaging spectrometer. Clear images were achieved from the processing of correction algorithm.
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Received: 2012-02-14
Accepted: 2012-04-10
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Corresponding Authors:
WANG Qiu-ping
E-mail: qiuping@mail.ustc.edu.cn
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