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指数加权均值比(ROEWA)算子是一种较好的适用于SAR图像的多边缘检测算子,然而传统方法无法准确定位边缘,且不能计算边缘方向。改进边缘检测流程,分析上述问题产生的原因并采用传统ROEWA算子保证边缘检测恒虚警,对ROEWA加权后的滤波值进行差分运算保证非极值抑制的准确性。利用Radon变换具有较好抗干扰性和几何解析性的性质,提出基于Radon变换计算边缘方向。针对实测SAR图像的实验结果表明,该方法边缘检测及边缘方向计算性能较好。
The exponential weighted average ratio (ROEWA) operator is a better multi-edge detection operator for SAR images. However, the traditional method can not accurately locate the edge and can not calculate the edge direction. The edge detection process is improved. The causes of the above problems are analyzed. The traditional ROEWA operator is used to guarantee the false alarm of edge detection. The ROEWA weighted filter is differentiated to ensure the accuracy of non-extreme suppression. Radon transform has better anti-interference and geometrical property, and the Radon transform is proposed to calculate the edge direction. The experimental results of the measured SAR images show that the method of edge detection and edge direction calculation performance is good.