关键词: SAR图像, ROEWA算子, Canny算子, 边缘检测, 海陆分离

Abstract: Although the weighted average ratio （ROEWA） edge detection operator is suitable for SAR images, this operator can not decide the edge direction according to gradient. Since SAR image is affected by multiplicative noise, it is taken the logarithm to change multiplicative noise to additive noise, then Canny operator can be used to calculate the direction of edges. Since land image has a lot of edges and ocean space is flat, land and ocean is different in gray scale, sea and land can be segmented, region growing is also used. Results show that the improved ROEWA operator is efficiency and precision in sea-land segmentation, the robustness is also good.

Key words: SAR image, ROEWA operator, Canny operator, edge detection, sea-land segmentation