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In order to overcome the shortcomings of the conventional local statistical speckle filters for synthetic aperture radar (SAR) images,a combined despeckling algorithm is proposed based on region classification,adaptive windowing,and structure detection.Firstly,the combined despeckling algorithm classifies the local region and directly preserves the strong edges and structures as well as the point targets.Then,the homogeneous region and the weak edge and structure region grow adaptively to obtain appropriate filtering windows.Lastly,the new filtering windows are classified.For the homogeneous region,the averaged filter is directly used.For the edge and structure region,the structure information is detected and the homogeneous sub-window is selected as the final filtering region.Despeckling experiments demonstrate that,the combined despeckling algorithm effectively suppresses the speckles in homogeneous region and edge region,and well preserves the strong edge and structure information as well as the point targets.
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Keywords:
- region classification /
- adaptive windowing /
- structure detection /
- combined despeckling algorithm
[1] ［1］ Guo H D 2000 Theory and Application of Radar Earth Observation (Beijing: Science Press) (in Chinese) ［郭华东 2000 雷达对地观测理论与应用 (北京：科学出版社)］
[2] ［2］ Oliver C, Quegan S 1998 Understanding Synthetic Aperture Radar Images (Boston: Artech House)
[3] ［3］Hou W, Lian Y, Feng G L 2007 Acta Phys. Sin. 56 589 (in Chinese)［侯威、廉毅、封国林 2007 56 589］
[4] ［4］Zhong C X, Yang T G 2007 Acta Phys. Sin. 56 6157 (in Chinese) ［仲崇霞、杨廷高 2007 56 6157］
[5] ［5］Wu Y G, Tao M D 2006 Chin. Phys. 15 1137
[6] ［6］Xie Z H, Xu L P, Ni G R 2008 Acta Phys. Sin. 57 6683 (in Chinese) ［谢振华、许录平、倪广仁 2008 57 6683］
[7] ［7］Teng S Y, Cheng C F, Liu M, Gui W L, Xu Z Z 2005 Chin. Phys. 14 1990
[8] ［8］Lee J S 1980 IEEE Trans. Pattern Anal. Machine Intell. 2 165
[9] ［9］Lopes A, Touzi R, Nezry E 1990 IEEE Trans. Geosci. Remote Sensing 28 992
[10] ］Kuan D T, Sawchuk A A, Strand T C, Chavel P 1987 IEEE Trans. Acoust., Speech, Signal Processing 35 373
[11] ］Lopes A, Nezry E, Touzi R, Laur H 1993 Int. J. Remote Sens. 14 1735
[12] ］Touzi R 2002 IEEE Trans. Geosci. Remote Sensing 40 2392
[13] ］Hervet E, Fjortoft R, Marthon P, Lopes A 1998 SPIE Conference on SAR Image Analysis, Modeling and Techniques III (Barcelona, Spain: SPIE) p43
[14] ］Li C 1988 Int. J. Remote Sens. 9 641
[15] ］Wu Y, Maitre H 1992 Opt. Eng. 31 1785
[16] ］Lee J S 1986 Opt. Eng. 25 636
[17] ］Touzi R, Lopes A, Bousquet P 1988 IEEE Trans. Geosci. Remote Sensing 26 764
[18] ］Park J M, Song W J, Pearlman W A 1999 IEE Proc. -Vis. Image Signal Process 146 191
[19] ］Bovik A C 1988 IEEE Trans. Acoust., Speech, Signal Processing 36 1618
[20] ］Baraldi A, Parmiggiani F 1995 IEEE Trans. Geosci. Remote Sensing 33 1245
[21] ］Lee J S 1981 Comput. Graph. Image Process. 15 380
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[1] ［1］ Guo H D 2000 Theory and Application of Radar Earth Observation (Beijing: Science Press) (in Chinese) ［郭华东 2000 雷达对地观测理论与应用 (北京：科学出版社)］
[2] ［2］ Oliver C, Quegan S 1998 Understanding Synthetic Aperture Radar Images (Boston: Artech House)
[3] ［3］Hou W, Lian Y, Feng G L 2007 Acta Phys. Sin. 56 589 (in Chinese)［侯威、廉毅、封国林 2007 56 589］
[4] ［4］Zhong C X, Yang T G 2007 Acta Phys. Sin. 56 6157 (in Chinese) ［仲崇霞、杨廷高 2007 56 6157］
[5] ［5］Wu Y G, Tao M D 2006 Chin. Phys. 15 1137
[6] ［6］Xie Z H, Xu L P, Ni G R 2008 Acta Phys. Sin. 57 6683 (in Chinese) ［谢振华、许录平、倪广仁 2008 57 6683］
[7] ［7］Teng S Y, Cheng C F, Liu M, Gui W L, Xu Z Z 2005 Chin. Phys. 14 1990
[8] ［8］Lee J S 1980 IEEE Trans. Pattern Anal. Machine Intell. 2 165
[9] ［9］Lopes A, Touzi R, Nezry E 1990 IEEE Trans. Geosci. Remote Sensing 28 992
[10] ］Kuan D T, Sawchuk A A, Strand T C, Chavel P 1987 IEEE Trans. Acoust., Speech, Signal Processing 35 373
[11] ］Lopes A, Nezry E, Touzi R, Laur H 1993 Int. J. Remote Sens. 14 1735
[12] ］Touzi R 2002 IEEE Trans. Geosci. Remote Sensing 40 2392
[13] ］Hervet E, Fjortoft R, Marthon P, Lopes A 1998 SPIE Conference on SAR Image Analysis, Modeling and Techniques III (Barcelona, Spain: SPIE) p43
[14] ］Li C 1988 Int. J. Remote Sens. 9 641
[15] ］Wu Y, Maitre H 1992 Opt. Eng. 31 1785
[16] ］Lee J S 1986 Opt. Eng. 25 636
[17] ］Touzi R, Lopes A, Bousquet P 1988 IEEE Trans. Geosci. Remote Sensing 26 764
[18] ］Park J M, Song W J, Pearlman W A 1999 IEE Proc. -Vis. Image Signal Process 146 191
[19] ］Bovik A C 1988 IEEE Trans. Acoust., Speech, Signal Processing 36 1618
[20] ］Baraldi A, Parmiggiani F 1995 IEEE Trans. Geosci. Remote Sensing 33 1245
[21] ］Lee J S 1981 Comput. Graph. Image Process. 15 380
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