ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., IV-2/W4, 439-443, 2017
https://doi.org/10.5194/isprs-annals-IV-2-W4-439-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
 
14 Sep 2017
A SAR INTENSITY IMAGES CHANGE DETECTION METHOD BASED ON FUSION DIFFERENCE DETECTOR AND STATISTICAL PROPERTIES
B. Cui1,2, Y. Zhang2, L. Yan1, and X. Cai2 1School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan, China
2Chinese Academy of Surveying & Mapping, 28 Lianhuachi West Road, Beijing, China
Keywords: SAR Change Detection, Multi-Temporal SAR Intensity Images, Log Ratio, Log Likelihood Ratio, Dual Thresholds Selection, Ratio Value of Adjacent Grey-Level Abstract. Detecting the land cover changes is an important application of multi-temporal synthetic aperture radar (SAR) images. This study puts forward a novel SAR change detection method which has two-steps: change detector construction and change threshold selection. For change detector construction, considering the SAR intensity images follow the gamma distribution, the conditional probabilities of the binary hypothesis test are provided, then the log likelihood ratio (LLR) combined with the log ratio (LR) to construct a detector which can enhance the degree of change to calculate the diversity degree convenient between the two images; for change threshold selection, owing to the characteristic that the curve about the ratio value of adjacent grey-level (GL) values in normalized difference map, the normalized difference map can be segmented in three parts by two thresholds selected which correspond to the regions of unchanged, backscatter enhanced and weakened separately. And as this, the change areas can be also determined simultaneously. The experimental results on different areas and sensors indicate that the proposed algorithm is effective and feasible.
Conference paper (PDF, 1747 KB)


Citation: Cui, B., Zhang, Y., Yan, L., and Cai, X.: A SAR INTENSITY IMAGES CHANGE DETECTION METHOD BASED ON FUSION DIFFERENCE DETECTOR AND STATISTICAL PROPERTIES, ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., IV-2/W4, 439-443, https://doi.org/10.5194/isprs-annals-IV-2-W4-439-2017, 2017.

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