In flight MTF monitoring and compensation for CCD camera on CBERS-02 |
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| Authors: | Gu Xingfa Li Xiaoying Min Xiangjun Yu Tao Sun Jijuan Zeng Yong Xu Hua Guo Ding |
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| Affiliation: | 1.State Key Laboratory of Remote Sensing Science,Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University,Beijing,China;2.The Center for National Spaceborne Demonstration,Beijing,China;3.Institut National de la Recherche Agronomique,Climat Sol Environnement,Avignon,France;4.Graduate University of Chinese Academy of Sciences,Beijing,China;5.China Center for Resource Satellite Data and Application,Beijing,China;6.University of Electronic Science and Technology of China,Chengdu,China |
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| Abstract: | In this article, the approach of simulating ideal tarp scene was proposed to determine the MTF for CCD camera on CBERS-02. The MTF acquired from this technique was compared to those from some common methods. MTFs achieved from different approaches were employed to compensate the CCD images based on three restoration algorithms: the iterative method, the Wiener filter and the modified inverse filter (MIF). The two-dimensional MTF was established with the value at frequency 0.5 for 45° directional MTF as the value at its four corners. This article addressed the variations of the restored CCD images with different techniques of constructing two-dimensional MTF, restoring algorithms and determining the in-flight MTFs. Results showed images restored with the MTF determined from the technique of simulating ideal tarp scene represent the real scene best. And the restoration technique based on the MIF would produce better restored images than the other two techniques. This research also demonstrated that the two-dimensional MTF used for restoration should be interpolated under the control of the MTF for 45° axis, rather than by multiplying the cross-orbit MTF with along-orbit MTF. |
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