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

Gui Gao; Xiaoyang Wang; Min Niu; Shilin Zhou

doi:10.1117/1.JRS.8.083583

28 July 2014 Modified log-ratio operator for change detection of synthetic aperture radar targets in forest concealment

Gui Gao, Xiaoyang Wang, Min Niu, Shilin Zhou

Author Affiliations +

Journal of Applied Remote Sensing, Vol. 8, Issue 1, 083583 (July 2014). https://doi.org/10.1117/1.JRS.8.083583

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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Gui Gao, Xiaoyang Wang, Min Niu, and Shilin Zhou "Modified log-ratio operator for change detection of synthetic aperture radar targets in forest concealment," Journal of Applied Remote Sensing 8(1), 083583 (28 July 2014). https://doi.org/10.1117/1.JRS.8.083583

Published: 28 July 2014

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