Research Papers

Modified log-ratio operator for change detection of synthetic aperture radar targets in forest concealment

[+] Author Affiliations
Gui Gao

National University of Defense Technology, School of Electronic Science and Engineering, Changsha 410073, China

Xiaoyang Wang, Min Niu, Shilin Zhou

National University of Defense Technology, School of Electronic Science and Engineering, Changsha 410073, China

J. Appl. Remote Sens. 8(1), 083583 (Jul 28, 2014). doi:10.1117/1.JRS.8.083583
History: Received April 10, 2014; Revised June 27, 2014; Accepted July 1, 2014
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Abstract.  Inherent speckle noise greatly limits the performance of change detection in synthetic aperture radar (SAR) images. In order to reduce the influence of such speckle noise, a modified-log-ratio (MLR) operator for change detection of targets in forest concealment is proposed. By performing a logarithm of the linear transform ratio on the pixel amplitude using multilook processing to generate a difference image, the presented MLR operator is theoretically proven to be capable of improved restraining of the negative effect of speckle noise over the conventional log-ratio operator. A Gaussian distribution of the MLR statistics is assumed, which facilitates the adaptive detection of targets using a constant false alarm rate technique. Experimental results based on the public VHF-band CARABAS-II SAR image dataset validate the effectiveness of the proposed operator.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Gui Gao ; Xiaoyang Wang ; Min Niu and Shilin Zhou
"Modified log-ratio operator for change detection of synthetic aperture radar targets in forest concealment", J. Appl. Remote Sens. 8(1), 083583 (Jul 28, 2014). ; http://dx.doi.org/10.1117/1.JRS.8.083583


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