基于Canny算子的边缘检测技术在遥感地质填图中的应用--以西准包古图地区为例

APPLICATION OF EDGEDETECTION TECHNOLOGY BASED ON CANNY ALGORITHMS IN GEOLOGICAL MAPPING:AN EXAMPLE FROM BAOGUTU AREA,THE CENTRAL ASIA

采用Canny边缘检测技术结合遥感影像去相关、降噪、图像平滑等综合的数字图像处理技术,从ETM+遥感影像中提取线性体信息,根据已有地质资料进行线形体统计特征分析和伪地质边界剔除,为遥感地质填图提供了技术支持.整个处理过程以Canny算法为核心,结合了小波变换、高斯滤波、梯度算子、阀值运算等多种图像处理方法,并在准噶尔西缘包古图地区的ETM+遥感影像上进行验证.结果表明,组合的一系列图像处理方法有效地提高边缘检测的准确性,根据已有的地质资料更加精确地修正、划分岩性单元以及确定岩性界线.准确地圈出包古图Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ号岩体,识别出达拉布特断裂及周围大量次级断裂,修正地层界线.

The canny edge detection technology combination of the related remote sensing digital images processing, such as noise reduction, image smoothing, decorrelation and so on. Extract the linear information from the ETM^＋ remote sensing images. In according to existing geological data,we can do line shape analysis and pseudo-statistical features geological boundaries removed for remote sensing geological mapping to make technical preparations for it. The canny algorithm is the core of the entire process, and combined with wavelet transform, Gaussian filtering, gradient operator, threshold computing, and other image processing methods. Validate the method in Baogutu area of the western Junggar, XinJiang. The results show that the combination of a series of image processing method effectively improve the accuracy of the edge detection, the method is simple and achieved better results. Identified the Ⅰ, Ⅱ, Ⅲ, Ⅳ,Ⅴ rock, Dalabute fault belt and the surrounding large secondary faults, amended the stratigraphic boundary. Through this study, the study improved the understanding of the geology in this area, geological prospecting for future work laid the foundation.