为利用精准的舰船尾迹检测结果，为航速航向信息反演等应用提供基础，提出基于傅里叶变换的SAR图像舰船尾迹检测方法。利用分数阶傅里叶变换方法，通过线性积分变换以及平面旋转两部分，变换舰船尾迹SAR图像，将其划分为高频子带与低频子带。利用Radon变换方法，累加SAR图像低频子带内直线像素点的灰度值，获取像素点与舰船尾迹线的几何对应关系，搜索Radon变换域中的峰值点位置，获取最终的SAR图像舰船尾迹线检测结果。实验结果表明，该方法可以有效检测SAR图像中的卡尔文尾迹、布拉格尾迹等不同类型的舰船尾迹，具有优越的舰船尾迹检测效果。
Fourier transform based ship wake detection method in SAR images is studied, and the accurate ship wake detection results are used to provide the basis for ship speed and course information inversion. By using fractional Fourier transform method, the ship wake SAR image is transformed by linear integral transformation and plane rotation, and the ship wake SAR image is divided into high frequency subband and low frequency sub-band. Radon transform method is used to accumulate the gray values of linear pixels in the low frequency sub-band of SAR images, obtain the geometric correspondence between pixels and ship wake lines, search the peak points in Radon transform domain, and obtain the final detection results of ship wake lines in SAR images. Experimental results show that this method can effectively detect different types of ship wakes such as Calvin's wake and Bragg's wake in SAR images, and has superior ship wake detection effect.
2023,45(23): 186-189 收稿日期：2023-06-17
DOI：10.3404/j.issn.1672-7649.2023.23.035
分类号：TP391
作者简介：夏云青(1973-),女,硕士,副教授,研究方向为应用数学及数学教育
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