Classification of Polarimetric SAR Data Using Dictionary Learning

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    Abstract

    This contribution deals with classification of multilook fully polarimetric synthetic aperture radar (SAR) data by learning a dictionary of crop types present in the Foulum test site. The Foulum test site contains a large number of agricultural fields, as well as lakes, forests, natural vegetation, grasslands and urban areas, which make it ideally suited for evaluation of classification algorithms.

    Dictionary learning centers around building a collection of image patches typical for the classification problem at hand. This requires initial manual labeling of the classes present in the data and is thus a method for supervised classification. Sparse coding of these image patches aims to maintain a proficient number of typical patches and associated labels. Data is consecutively classified by a nearest neighbor search of the dictionary elements and labeled with probabilities of each class.

    Each dictionary element consists of one or more features, such as spectral measurements, in a neighborhood around each pixel. For polarimetric SAR data these features are the elements of the complex covariance matrix for each pixel. We quantitatively compare the effect of using different representations of the covariance matrix as the dictionary element features. Furthermore, we compare the method of dictionary learning, in the context of classifying polarimetric SAR data, with standard classification methods based on single-pixel measurements.
    Original languageEnglish
    JournalProceedings of SPIE - The International Society for Optical Engineering
    Volume8537
    Pages (from-to) 85370X
    ISSN0277-786X
    DOIs
    Publication statusPublished - 2012
    EventSPIE Remote Sensing : Image and Signal Processing for Remote Sensing - Edinburgh International Conference Centre, Edinburgh, United Kingdom
    Duration: 24 Sept 201227 Sept 2012

    Conference

    ConferenceSPIE Remote Sensing : Image and Signal Processing for Remote Sensing
    LocationEdinburgh International Conference Centre
    Country/TerritoryUnited Kingdom
    CityEdinburgh
    Period24/09/201227/09/2012

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