高分辨率遥感影像桥梁特征提取方法研究*

根据桥梁水体相连的知识，提出了一种基于知识的高分辨率遥感影像水上桥梁提取的实用方法，即在水体提取的基础上将图像细化，通过宽度限制检测桥梁主干线，并对其进行矢量化和特征表达来实现桥梁提取，通过实验证明了该方法的有效性。实验证明此方法不仅适合于水体与陆地灰度差别大，即单峰直方图的影像，还适合于水体与陆地灰度差别不大，即直方图多峰或峰顶不明显的影像。

Research on Bridge Extraction from High Resolution Remote Sensing Image

According to the fact that bridge over the water is connected with water in remote sensing image, this paper proposes a practicable knowledge based bridge extraction method from high resolution remote sensing image. The steps are: water extraction based on GMRF SVM classification; image thinning; main line of detection by width; vectorization; feature expression. In the end, this paper gives the test with IKONOS image. The experimental results show that the method presented is suitable for images both with single peak histogram (the contrast between water and land is great ) and with multi peak histogram (the gray value of water is close to land).