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Fast Classification for Large Polarimetric SAR Data Based on Refined Spatial-Anchor Graph


Abstract:

The graph model-based semisupervised machine learning is well established. However, its computational complexity is still high in terms of the time consumption especially...Show More

Abstract:

The graph model-based semisupervised machine learning is well established. However, its computational complexity is still high in terms of the time consumption especially for large data. In this letter, we propose a fast semisupervised classification algorithm using the recently presented spatial-anchor graph for a large polarimetric synthetic aperture radar (Pol-SAR) data, named as Fast Spatial-Anchor Graph (FSAG) based algorithm. Based on an initial superpixel segmentation on the PolSAR image, the homogenous regions are obtained. The border pixels are reassigned to the most similar superpixel according to majority voting and distance measurement. Then, feature vectors are weighted within local homogenous regions. The refined spatial-anchor graph is constructed with these regions, and the semisupervised classification is conducted. Experimental results on synthesized and real PolSAR data indicate that the proposed FSAG greatly reduces time consumption and maintains the accuracy for terrain classifications compared with state-of-the-art graph-based approaches.
Published in: IEEE Geoscience and Remote Sensing Letters ( Volume: 14, Issue: 9, September 2017)
Page(s): 1589 - 1593
Date of Publication: 31 July 2017

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