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遥感图像端元光谱变异性的模糊描述

DOI: 10.11834/jig.20090401

Keywords: 模糊子集,可能性分布,混合像元分解,端元,光谱变异性

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Abstract:

在遥感图像中,利用模糊扩展的概率测度描述混合像元各端元的丰度含量,是模糊集合理论进行混合像元分解的主要手段。然而由于非线性因素的影响以及自然地物的复杂性,往往导致了端元光谱的变异性,这是造成混合像元分解误差的主要原因之一。从模糊集合的另一种测度――可能性测度出发,讨论了对端元光谱的变异性的描述:在遥感图像多维正态分布假设的前提下,利用1维连续的卡方分布,提出了面向遥感图像可能性分布的模糊描述,并进一步提出了可能性分布的模糊划分算法,对整个图像进行端元的模糊划分,从而描述端元光谱的变异性。通过对真实的高光谱遥感图像进行检验,结果表明,该方法能充分地表达端元光谱的变异性,可为今后进一步提高遥感图像混合像元分解精度提供重要的参考。

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