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A Study on Cloud Texture Feature Quantities of the SatelliteVIS Imagery with Solar Eclipse Shadow |
ZHANG Hong, WANG Zhen-hui, XU Jian-ming, PEI Xiao-fang |
(Department of Electronic Engineering,Nanjing Institute of Meteorology,Nanjing210044,China) |
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Abstract Solar eclipse would result in an obvious shadow on satellite VIS imagery. In the shadow, thetype and the shape of cloud can not be distinguished correctly, which would have impact on analyzing andapplying the information of the satellite VIS imagery in practice, so it is very important to eliminate theeclipse shadow. In this paper, the theory of solar eclipse is given at first and then the radiant revisalfunction, which the satellite can receive the radiation from the earth, is given. Using the radiant revisalfunction, the eclipse shadow can be eliminated. Based on the point of image manipulation, using the graylevel coocurrence matrix and cloud texture feature quantities, such as contrast, entropy and correlation,the effect of the solar eclipse elimination can be estimated. The results show that the method is moreeffective, the alteration of the gray level coocurrence matrix and the contrast and the entropy indicated thatthe shadow has been eliminated primarily, the texture and structure of cloud system are trenchanter thanbefore , while the correlation of cloud system keeps unchanged.
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Received: 09 September 2003
Published: 26 December 2011
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