掩模图像生成时阈值取值的合理性探讨

发布时间：2018-05-21 12:37

本文选题：阈值 + 掩模图像　；参考：《国土资源遥感》2017年02期

【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。
[Abstract]:Whether the threshold value is reasonable is very important to the generation of binary and multi-valued mask images which meet certain conditions. This technique is a key step to remove interference information and extract useful information. Based on different thresholds, this paper discusses how to judge whether the threshold is reasonable when generating binary mask images with a single interference factor, and takes the TM data in Tianjun area of Qinghai Province as an example. The multivalue mask image with reasonable threshold is used to obtain the remote sensing image without interference information, and then the abnormal information of mineralization alteration is extracted to verify the rationality of the threshold value. The results show that the threshold value of the binary mask image generated by a single interference factor is reasonable and the interference factors do not overlap each other when the binary interference factors and the non-interference regions extracted from the multi-valued mask images are consistent. Using the reasonable and correct multi-value mask image, the interference and false anomaly information can be eliminated more effectively, and the true and reliable information of mineralization alteration anomaly can be extracted. As there are more reasonable thresholds, the optimal threshold can be obtained only by combining many kinds of geoscience data.
【作者单位】：青海大学地质系;青藏高原北缘新生代资源环境重点实验室;
【分类号】：TP751

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