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Anisotropic diffusion for speckle filtering of polarimetric synthetic aperture radar imagery

[+] Author Affiliations
Sheng Sun

Huazhong University of Science and Technology, Institute for Pattern Recognition and Artificial Intelligence, Wuhan 430074, China

Guangdong University of Technology, School of Computer Science, Guangzhou 510006, China

Jinwen Tian

Huazhong University of Science and Technology, Institute for Pattern Recognition and Artificial Intelligence, Wuhan 430074, China

Zhusong Liu

Guangdong University of Technology, School of Computer Science, Guangzhou 510006, China

Nian Cai

Guangdong University of Technology, School of Information Engineering, Guangzhou 510006, China

J. Electron. Imaging. 22(1), 013003 (Jan 03, 2013). doi:10.1117/1.JEI.22.1.013003
History: Received April 18, 2012; Revised November 20, 2012; Accepted November 29, 2012
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Abstract.  The mission of speckle filtering is more intricate for a polarimetric synthetic aperture radar (SAR) system than for a single polarization SAR system. A new speckle filter that employs nonlinear anisotropic diffusion is proposed. The speckle filtering principles in a polarimetric SAR system are thoroughly investigated. Our study demonstrates that preservation of polarimetric properties and reduction of speckle level are very important clauses among those principles. Anisotropic diffusion outperforms window-based filters because it utilizes a diffusion tensor that can bias the direction of diffusion toward the orientation of interesting features. The procedure of diffusion is iterative, so it can lead to a gradual alleviation of speckle noise. The parameters for diffusion are flexible and adjustable, thus the filtering results are controllable according to the requirements of specific applications. Multidimensional and vector-valued model is combined with local statistics based on polarimetric SAR configuration. The experimental results on electromagnetics institute synthetic aperture radar (EMISAR) datasets show that the proposed filter has good performance in speckle reduction and preservation of polarimetric properties.

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© 2013 SPIE and IS&T

Citation

Sheng Sun ; Jinwen Tian ; Zhusong Liu and Nian Cai
"Anisotropic diffusion for speckle filtering of polarimetric synthetic aperture radar imagery", J. Electron. Imaging. 22(1), 013003 (Jan 03, 2013). ; http://dx.doi.org/10.1117/1.JEI.22.1.013003


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