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A Technique of RS Image Restoration and In-flight Measurement of Remote Sensor MTF |
WANG Xian-hua, QIAO Yan-li, HONG Jin |
(Anhui Institute of Optics and Fine Mechanics of Chinese Academy of Sciences, Hefei 230031, China) |
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Abstract Due to effects of atmosphere and optical subsystem , detector and electronic subsystem in imaging system , there is degradation in imaging process. The degradation of imaging system induces imagery blur.The ability to acquire information from blurred image is debased The technique of image restoration can improve imagery quality, so it can enhance the ability to acquire information from restored image. According to the requirement of image restoration technique, high precision modulate transfer function (MTF) of imaging system is the base of high-quality imagery restored. Since there are differences of MTF between different remote sensors and at different period of same remote sensor, it is important to acquire MTF of imaging system in-flight. The paper presents systematically a in-flight measurement technique of remote sensor MTF, which is called knife edge technique. In the technique, we first analyze its principle and its requirement on targets in images, then introduce in detail several key techniques including sampling method line by line in image, registering line pixels with shif ted knife method and fitting method to acquired knife edge. After introducing the technique of image restoration based on imaging system’MTF,the paper shows the improved image on the bases of experiment. The result appears imagery quality is imp roved obviously.
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Received: 07 January 2006
Published: 27 September 2011
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