The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume XLI-B7
https://doi.org/10.5194/isprs-archives-XLI-B7-611-2016
https://doi.org/10.5194/isprs-archives-XLI-B7-611-2016
21 Jun 2016
 | 21 Jun 2016

AN UNSUPERVISED CHANGE DETECTION BASED ON TEST STATISTIC AND KI FROM MULTI-TEMPORAL AND FULL POLARIMETRIC SAR IMAGES

J. Q. Zhao, J. Yang, P. X. Li, M. Y. Liu, and Y. M. Shi

Keywords: Change Detection, Multi-temporal, Synthetic Aperture Radar (SAR), Test Statistic, Kittler and Illingworth (KI)

Abstract. Accurate and timely change detection of Earth’s surface features is extremely important for understanding relationships and interactions between people and natural phenomena. Many traditional methods of change detection only use a part of polarization information and the supervised threshold selection. Those methods are insufficiency and time-costing. In this paper, we present a novel unsupervised change-detection method based on quad-polarimetric SAR data and automatic threshold selection to solve the problem of change detection. First, speckle noise is removed for the two registered SAR images. Second, the similarity measure is calculated by the test statistic, and automatic threshold selection of KI is introduced to obtain the change map. The efficiency of the proposed method is demonstrated by the quad-pol SAR images acquired by Radarsat-2 over Wuhan of China.