A Survey on Change Detection in Synthetic Aperture Radar Imagery
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摘要: 遥感影像变化检测技术用于检测同一地点在一段时间内所发生的变化情况，具有重要的应用价值.而基于合成孔径雷达(synthetic aperture radar, SAR)影像的变化检测由于其传感器具有不受时段、天气条件影响等优良特性而在近年内受到了广泛的关注.针对SAR影像变化检测这一核心任务，首先对其经典步骤以及每一步的传统方法进行介绍，然后对在近年来的诸多新兴热点算法加以归纳总结.这些热点算法对差异图的生成以及阈值、聚类、图切和水平集4种常用的差异图分析法进行了不同程度的研究，将传统方法针对变化检测任务进行了相应改善，取得了良好的效果.在由浅入深地介绍了这些算法的同时也进行了理论上的分析对比.为了验证这些方法的有效性，使用了2组数据集对这些方法进行了测试，定量比较了一些方法的性能.最后针对目前SAR影像变化检测技术中需要进一步研究的内容作了展望.Abstract: Change detection in remote sensing imagery is a significant issue to detect the changes happening during a period of time at the same area. The change detection task based on synthetic aperture radar (SAR) imagery has been widely concerned in recent years due to their independence on time or weather condition. This paper first gives out a brief introduction to the classical steps along with some traditional methods, and then puts its emphasis on the summary of the burgeoning methods proposed recently. By improving the traditional methods, these state-of-the-art algorithms aim at generating a difference image and analyzing it by using the threshold, clustering, graph cut and level set methods, obtaining some satisfactory results and making a contribution to an accurate detection. The algorithms are introduced from the elementary to the profound, and their performance is compared theoretically. To demonstrate their effectiveness, two datasets are tested on these algorithms and an objective comparison is made to show the different properties of these algorithms. Finally, several meaningful viewpoints based on the practical problems for the future research of change detection are proposed, throwing light upon some further research directions.
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