摘要:
阈值取值是否合理对生成符合某种条件的二值及多值掩模图像是否正确至关重要,而这项技术是去除干扰信息及提取有用信息的关键步骤.基于不同的阈值,探讨如何判断在生成单一干扰因素的二值掩模图像时阈值是否合理的方法;并以青海省天峻地区TM数据为例,利用阈值合理的多值掩模图像得到无干扰信息的遥感图像,进而提取了矿化蚀变异常信息,以实现阈值的合理性验证.结果表明,当利用多种干扰因素的二值及多值掩模图像提取的非干扰区域一致时,则说明生成单一干扰因素的二值掩模图像的阈值取值合理,各种干扰因素相互不重叠;利用合理正确的多值掩模图像才能更有效地剔除干扰及假异常信息,提取出真实可靠的矿化蚀变异常信息;由于合理的阈值较多,应结合多种地学资料才能获得最优阈值.
关键词:
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阈值
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掩模图像
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干扰信息
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重叠
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ERDAS
Abstract:
The problem whether the threshold value is reasonable is very important to the binary or multi mask image formed under the condition of multi-interference information, and it is really the key to delete the interference information and extract the useful information.In this paper, the author discussed the problem as to whether the method is reasonable or not in judging the threshold value under the condition of forming binary mask image with single interference factor based on different thresholds and deleting interference information based on multi-value masking image with reasonable threshold, with the purpose of extracting the alteration information.The results show that, if the same non-interfering regions can be extracted based on the binary or multi mask image with multi-interference information, the threshold value is reasonable in forming binary mask image with single interference factor, the multi-interference information will underlap each other, the interference information or the false information can be deleted and the true alteration information can be extracted based on the true multi mask image.
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