AN EVIDENT SIDELOBE CONTROL METHOD BASED ON NSCT FOR SHIP TARGET IN SAR IMAGES  

作　　者：Li Xueying Yin Dong Zhang Rong Wang Kui 

机构地区：[1]School of Information Science ＆ Technology, University of Science and Technology of China, Hefei 230027, China

出　　处：《Journal of Electronics(China)》2011年第4期419-426,共8页电子科学学刊（英文版）

基　　金：Supported by the National Basic Research Program of China (973 Program) (No. 2010CB731900)

摘　　要：Evident sidelobe on faint ship target seriously affects the accuracy of the target segmen-tation in Synthetic Aperture Radar(SAR) images.To avoid this problem,a novel sidelobe control method based on NonSubsampled Contourlet Transform(NSCT) for ship targets in SAR images is presented in this paper.This method enhances the SAR images in NSCT domain based on target azimuth estimation and then inhibits the sidelobe directionally in NSCT high-pass frequency subbands.Experimental results on RADARSAT-2 images demonstrate that the proposed method can not only reduce the strong sidelobes effectively,but also enhance the intensity of the objects successfully.Therefore,it gives a good segmentation result on the dark ship images with strong sidelobe,and en-hances the detection rate on these targets.Evident sidelobe on faint ship target seriously affects the accuracy of the target segmen-tation in Synthetic Aperture Radar（SAR） images.To avoid this problem,a novel sidelobe control method based on NonSubsampled Contourlet Transform（NSCT） for ship targets in SAR images is presented in this paper.This method enhances the SAR images in NSCT domain based on target azimuth estimation and then inhibits the sidelobe directionally in NSCT high-pass frequency subbands.Experimental results on RADARSAT-2 images demonstrate that the proposed method can not only reduce the strong sidelobes effectively,but also enhance the intensity of the objects successfully.Therefore,it gives a good segmentation result on the dark ship images with strong sidelobe,and en-hances the detection rate on these targets.

关 键 词：Synthetic Aperture Radar(SAR) NSCT Sidelobe control Directional enhancement 

分 类 号：TP751.1[自动化与计算机技术—检测技术与自动化装置]