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Region-based classification of PolSAR data using radial basis kernel functions with stochastic distances

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journal contribution
posted on 24.03.2021, 22:43 by RG Negri, Alejandro Frery, WB Silva, TSG Mendes, LV Dutra
© 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group. Region-based classification of PolSAR data can be effectively performed by seeking for the assignment that minimizes a distance between prototypes and segments. Silva et al. [“Classification of segments in PolSAR imagery by minimum stochastic distances between wishart distributions.” IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 6 (3): 1263–1273] used stochastic distances between complex multivariate Wishart models which, differently from other measures, are computationally tractable. In this work we assess the robustness of such approach with respect to errors in the training stage, and propose an extension that alleviates such problems. We introduce robustness in the process by incorporating a combination of radial basis kernel functions and stochastic distances with Support Vector Machines (SVM). We consider several stochastic distances between Wishart: Bhatacharyya, Kullback-Leibler, Chi-Square, Rényi, and Hellinger. We perform two case studies with PolSAR images, both simulated and from actual sensors, and different classification scenarios to compare the performance of Minimum Distance and SVM classification frameworks. With this, we model the situation of imperfect training samples. We show that SVM with the proposed kernel functions achieves better performance with respect to Minimum Distance, at the expense of more computational resources and the need of parameter tuning. Code and data are provided for reproducibility.

History

Preferred citation

Negri, R. G., Frery, A. C., Silva, W. B., Mendes, T. S. G. & Dutra, L. V. (2019). Region-based classification of PolSAR data using radial basis kernel functions with stochastic distances. International Journal of Digital Earth, 12(6), 699-719. https://doi.org/10.1080/17538947.2018.1474958

Journal title

International Journal of Digital Earth

Volume

12

Issue

6

Publication date

03/06/2019

Pagination

699-719

Publisher

Informa UK Limited

Publication status

Published

Online publication date

02/06/2018

ISSN

1753-8947

eISSN

1753-8955

Language

en