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| 基于小波变换和数学形态学的潮沟提取方法研究 |
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和思海,韩震,朱言江,胡旭冉,丁如一
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上海海洋大学海洋科学学院,上海海洋大学海洋科学学院,上海海洋大学海洋科学学院,上海海洋大学海洋科学学院,上海海洋大学海洋科学学院
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| 摘要: |
| 潮沟是潮滩的主要地貌类型之一，潮沟信息的检测对湿地生态环境的监测和保护有着重要意义。本文以长江口九段沙下沙北部发育比较复杂的潮沟为研究对象，使用2016年1月26日Landsat8全色波段数据，采用了一种融合小波变换、最大类间方差法和数学形态学的方法对潮沟边缘信息进行了检测。小波变换中通过减小高层小波系数，达到弱化潮滩信息的目的；通过增大低层小波系数，达到增强潮沟信息的目的；利用数学形态学对断开的潮沟进行连接；接着利用图像之间的加减乘运算，完成潮沟的提取；最后，分别在原始数据和检测结果相应的位置取样进行精度验证，样方潮沟面积一致性精度平均为92.7%。 |
| 关键词: 潮沟 小波变换 最大类间方差法 数学形态学 精度验证 |
| DOI：10.11759/hykx20170412002 |
| 分类号:p737 |
| 基金项目:国土资源部公益性行业科研专项(201211009) |
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| Research on the method of tidal channel detection based on wavelet transform and Mthematical morphology method |
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HE Sihai,HAN Zhen,ZHU Yanjiang,HU Xuran and Ding Ruyi
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Shanghai Ocean University,College of Marine Science Shanghai Ocean University,Shanghai Ocean University/The College of Marine Science,College of Marine Science Shanghai Ocean University,College of Marine Science Shanghai Ocean University
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| Abstract: |
| Tidal channel is one of the major landforms of tidal flat, and the extraction of tidal channel plays a key role for monitoring and protecting ecological environment of wetland. Taking a complex tidal channel at northern Xiasha of Jiuduan Sha in the Yangtze river estuary as an object, the paper adopted a fusion of Wavelet transform, Otsu method and Mthematical morphology method to detect edge information using Landsat8 panchromatic band data on January 26th,2016. In the process of Wavelet transform, reducing the high level detail coefficients is to weaken the tidal flat information and increasing the lower layer detail coefficients is to enhanced tidal channel information;Mathematical morphology method is used to connect the broken tidal channel.Then using the addition subtraction and multiplication of images to complete the extraction of tidal channel; Finally, the accuracy of the tidal flat area consistent averagely is 92.7%, which is verified by the sampling of the original data and the corresponding results. |
| Key words: Tidal flat Wavelet transform Otsu method Mthematical morphology method Verify the accuracy |