| 一种新的SAR图像相干斑抑制算法 |
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| 引用本文： | 张志禹,张九龙,荣柱,吕延军,黄薇.一种新的SAR图像相干斑抑制算法[J].遥感学报,2009,13(2):208-211. |
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| 作者姓名： | 张志禹 张九龙 荣柱 吕延军 黄薇 |
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| 作者单位： | 西安理工大学,自动化与信息工程学院,陕西,西安,710048 |
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| 摘 要： | 合成孔径雷达(SAR)图像会受到相干斑噪声的污染,对SAR图像的后续处理产生了很大影响.提出一种基于快速离散曲波变换(FDCT)抑制合成孔径雷达(SAR)图像相干斑噪声的方法.先通过FDCT把SAR图像变换到曲波域中,得到曲波系数,再应用自适应阈值算法估计不同尺度、不同方位曲波系数的阈值,分别对曲波系数进行硬阈值和软阈值化处理,最后通过FDCT反变换恢复出图像.对单视SAR原始图像进行处理,并与小波去噪方法进行各种量化比较,结果表明,Curvelet滤波器要比Wavelet滤波器效果好,软阈值算法的效果比硬阈值算法好.基于FDCT的SAR图像相干斑去噪,不仅抑制相干斑能力比较强,而且在目标的边缘及纹理信息的保持上也有很大的优势.
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| 关 键 词： | 合成孔径雷达 相干斑 快速离散曲波变换(FDCT) 图像去噪 |
A new method for SAR images speckle reduction |
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| ZHANG Zhi-yu,ZHANG Jiu-long,RONG Zhu,LU Yan-jun and HUANG Wei.A new method for SAR images speckle reduction[J].Journal of Remote Sensing,2009,13(2):208-211. |
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| Authors: | ZHANG Zhi-yu ZHANG Jiu-long RONG Zhu LU Yan-jun and HUANG Wei |
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| Abstract: | Synthetic Aperture Radar (SAR) image is polluted easily by speckle noise, which can affect further
processing ofSAR image. Traditionalmethods employ wavelet transform, which is only effective in representing point
singularities. Based on FastDiscrete CurveletTransform (FDCT), a de-noising method for SAR image is presented.
FDCT is employed to transform the SAR image into the curveletdomain to obtain the curveletcoefficients, and then soft
and hard thresholding de-noising processes are performed separately on the Curvelet coefficients of different scales and
directions by using adaptive threshold estimation. Finally the SAR image is reconstructed by inverse FDCT. This de-
noisingmethod is applied to the experiments of a single look SAR image, and compared with the wavelet de-noising
method. Experimental results indicate thatbased-FDCT de-noisingmethod is amore effectivemethod, which is notonly
better in reducing speckle, butalso ofadvantage in holding information of targetedge and grain. |
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| Keywords: | synthetic aperture radar speckle fast discrete curvelet transform (FDCT) image denoising |
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