一种SAR图像海洋涡旋形状自动描绘及信息提取方法

合成孔径雷达(SAR)为海洋涡旋的观测和研究提供了大量的图像数据.利用 SAR 图像自动地描绘涡旋形状,并提取涡旋信息,对海洋涡旋研究和涡旋 SAR图像应用有着重要意义.该文针对 SAR图像中螺旋形状的涡旋,提出了一种SAR图像海洋涡旋形状自动描绘及信息提取方法.该方法先将SAR图像骨架化,再在 SAR图像上绘制骨架图中检测到的对数螺旋线,直观地描绘涡旋形状,然后利用形状描绘结果提取涡旋信息.该文利用 sentinel-1 黑海地区涡旋 SAR图像进行了实验,实验结果表明,该方法能实现涡旋形状的自动描绘和涡旋信息提取,形状描绘结果与涡旋实际形状相符,提取的涡旋信息与手动提取的参考信息一致,验证了方法的有效性.

A method of automatic shape depiction and information extraction for oceanic eddies in SAR images

Synthetic aperture radar (SAR)provides a large amount of image data for the observation and research of oceanic eddies.The use of SAR images to automatically depict the shape of eddies and extract the eddy information is of great significance to the study of the oceanic eddies and the application of SAR eddy images.In this paper,a method of automatic shape depiction and information extraction for oceanic eddies in SAR images is proposed,which is for the research of spiral eddies.Firstly,the skeleton image is got by the skeletonization of SAR image.Secondly,the logarithmic spirals detected in the skeleton image are drawn on the SAR image to depict the shape of oceanic eddies.Finally,the eddy information is extracted based on the results of shape depiction.The sentinel-1 SAR eddy images in the Black Sea area were used for the experiment in this paper.The experimental results show that the proposed method can automatically depict the shape of eddies and extract the eddy information.The shape depiction results are consistent with the actual shape of the eddies,and the extracted eddy information is consistent with the reference information extracted by manual operation.As a result,the validity of the method is verified.