自适应SAR图像边缘检测算法

刘振华; 毛士艺

自适应SAR图像边缘检测算法

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出版历程
- 收稿日期: 2001-11-30
- 修回日期: 2002-06-13
- 刊出日期: 2003-04-19

Adaptive edge detection algorithm of sar image

摘要

摘要: 边缘检测是图像分析的基础,在对SAR图像进行边缘检测时,由于SAR图像存在很强的相干乘性斑点噪声,几乎没有一种方法既能有效地检测边缘又能排除斑点噪声的影响而不产生较多的虚假边缘,特别是在低视数SAR的情况下,该文指出了在低视数情况下应当如何对Touzi ratio边缘检测方法和最大似然(ML)边缘方法的检测窗口进行改进,在对SAR图像进行边缘检测时,引入了自适应窗口的方法,并将其应用到Touzi ratio边缘检测和最大似然 (ML)两个恒虚警边缘检测算法中,取得了很好的改进效果,引入自适应窗口的方法也适用于其它的SAR图像边缘检测算法。
- 合成孔径雷达; 边缘检测; 斑点; 自适应
Abstract: Due to the multiplicative nature of the speckle noise in SAR images, for edge detecting of SAR images, few method can be found to detect edges efficiently while depress the speckle noise effects without too much false edges, especially in the low look number SAR image case. In this paper, discussions are presented on the improvement of Touzi ratio edge detect method and maximum likelihood method in the low look number SAR image case, and then an adaptive window technique is introduced into SAR image edge detection. The adaptive windows are applied to the two Constant False Alarm Ratio (CFAR) edge detection algorithms mentioned above and fine improvement has been achieved. The technique is also proper for other SAR image edge detection algorithms.

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参考文献(1)

P. Marthon, E. Cubero-Castan , An optimal multiedge detector for SAR image segmentation,IEEE Trans. on Geosci. and Remote Sensing, 1998, 36(3), 793-802.[2]R. Fjortoft, A. Lopes, J. Bruniquel, P. Marthon, Optimal edge detection and edge localization in complex SAR images with correlated speckle, IEEE Trans. on Geosci. and Remote Sensing,1999, 37(5), 2272-2281.[3]R. Touzi, A. Lopes, P. Bousquet, A statistical and geometrical edge detector for SAR images,IEEE Trans. on Geosci. and Remote Sensing, 1988, 26(6), 764-773.[4]C.J. Oliver, D. Blacknell, R. G. White Optimum edge detection in SAR, IEE Proc., Radar Sonar Navigation, 1996, 143(1), 31-40.[5]F. Bush, F. T. Ulaby, Fading charachteristics of panchromatic radar backscatter from selected agricultural targets, IEEE Trans. on Geosci. Electron., 1975, GE-13(4), 149-157.[6]刘振华,毛士艺,低视数SAR图像边缘检测算法研究,信号处理,2001,17(增刊),287-290. ［7］C. Oliver, Understanding Synthetic Aperture Radar Image, Boston, London, Arrech House, 1998,88-131.[7]J.M. Park, W. J. Song, Speckle filtering of SAR images based on adaptive windowing, IEE Proc.-Vision. Image, Signal Process, 1999, 146(4), 191-197.[8]F.J. Martin, R. W. Turner, SAR speckle reduction by weighting filter, Int. J. Remote Sens, 1993,14(9), 1759-1774.

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