On Threshold Selection for Improved SAR Two-Stage Change Detection

Akshay S. Bondre, C. Richmond
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引用次数: 1

Abstract

The sample intensity ratio estimator and the sample coherence estimator are test statistics which are generally used for detecting areas of change between two synthetic aperture radar (SAR) images of the same scene, taken at different times. Cha et al. have proposed a two-stage change detection method, where the first stage consists of the sample intensity ratio detector, and the second stage uses the Berger's statistic instead of the classical coherence estimator as an estimate of the true coherence between the corresponding pixels in the two images. It was shown with the help of experimental results that the two-stage change detector performs better than the sample intensity ratio as well as the sample coherence detector. However, they have used a heuristic approach to determine the thresholds for the two-stage change detection method. In this paper, using the joint distribution of the sample intensity ratio and the Berger's coherence estimate, an approach for determining the thresholds for this two dimensional detection problem is proposed. Theoretical receiver operating characteristics (ROC) curve analysis suggests that for a given probability of false alarm, using the proposed threshold selection method for the two-stage detector yields a higher overall performance as compared to the classical coherence estimator statistic. Also, it is shown that when some practical considerations are taken into account, a modified detector must be used in order to realize this improved change detection.
改进SAR两阶段变化检测的阈值选择研究
样本强度比估计量和样本相干性估计量是一种测试统计量,通常用于检测同一场景不同时间的两幅合成孔径雷达(SAR)图像之间的变化区域。Cha等人提出了一种两阶段变化检测方法,其中第一阶段由样本强度比检测器组成,第二阶段使用Berger's统计量而不是经典相干估计量来估计两幅图像中对应像素之间的真实相干性。实验结果表明,两级变化检测器的性能优于样品强度比检测器和样品相干检测器。然而,他们使用启发式方法来确定两阶段变化检测方法的阈值。本文利用样本强度比的联合分布和伯杰相干估计,提出了一种确定二维检测问题阈值的方法。理论接收机工作特性(ROC)曲线分析表明,对于给定的虚警概率,与经典相干估计统计量相比,使用所提出的两级检测器阈值选择方法可以产生更高的整体性能。此外,还表明,当考虑到一些实际的考虑因素时,为了实现这种改进的变更检测,必须使用改进的检测器。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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