中文说明：ROEWA是道路提取的一种经典算法，本代码是ROEWA的MATLAB实现。针对合成孔径雷达(SAR)图像特有的乘性噪声和非恒虚警统计特性很难正确提取目标边缘的问题,提出了在指数加权均值比(ROEWA)算子。本代码对SAR图像边缘有较好的检测结果，可以用于某些工程。对于SAR影像的边缘检测，许多算法是单边缘的，针对单边缘检测器的这一缺陷,建立了一个多边缘模型的指数加权均值比(ROEWA)检测器。
English Description：
Roewa is a classic algorithm of road extraction, this code is the matlab implementation of roewa. Aiming at the problem that it is difficult to extract the target edge correctly due to the multiplicative noise and non constant false alarm rate (CFAR) statistical characteristics of synthetic aperture radar (SAR) image, the exponential weighted mean ratio (roewa) operator is proposed. This code has good detection results for SAR image edge, and can be used in some projects. For the edge detection of SAR image, many algorithms are single edge. Aiming at the defect of single edge detector, a multi edge model exponential weighted average ratio (roewa) detector is established.