Repeated constrained sparse coding with partial dictionaries for hyperspectral unmixing

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    13 Citations (Scopus)

    Abstract

    Hyperspectral images obtained from remote sensing platforms have limited spatial resolution. Thus, each spectra measured at a pixel is usually a mixture of many pure spectral signatures (endmembers) corresponding to different materials on the ground. Hyperspectral unmixing aims at separating these mixed spectra into its constituent end-members. We formulate hyperspectral unmixing as a constrained sparse coding (CSC) problem where unmixing is performed with the help of a library of pure spectral signatures under positivity and summation constraints. We propose two different methods that perform CSC repeatedly over the hyperspectral data. However, the first method, Repeated-CSC (RCSC), systematically neglects a few spectral bands of the data each time it performs the sparse coding. Whereas the second method, Repeated Spectral Derivative (RSD), takes the spectral derivative of the data before the sparse coding stage. The spectral derivative is taken such that it is not operated on a few selected bands. Experiments on simulated and real hyperspectral data and comparison with existing state of the art show that the proposed methods achieve significantly higher accuracy. Our results demonstrate the overall robustness of RCSC to noise and better performance of RSD at high signal to noise ratio. © 2014 IEEE.
    Original languageEnglish
    Title of host publication2014 IEEE Winter Conference on Applications of Computer Vision (WACV)
    PublisherIEEE, Institute of Electrical and Electronics Engineers
    Pages953-960
    ISBN (Print)9781479949854
    DOIs
    Publication statusPublished - 2014
    Event2014 IEEE Winter Conference on Applications of Computer Vision - Steamboat Springs, United States
    Duration: 24 Mar 201426 Mar 2014

    Conference

    Conference2014 IEEE Winter Conference on Applications of Computer Vision
    CountryUnited States
    CitySteamboat Springs
    Period24/03/1426/03/14

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  • Cite this

    Akhtar, N., Shafait, F., & Mian, A. (2014). Repeated constrained sparse coding with partial dictionaries for hyperspectral unmixing. In 2014 IEEE Winter Conference on Applications of Computer Vision (WACV) (pp. 953-960). IEEE, Institute of Electrical and Electronics Engineers. https://doi.org/10.1109/WACV.2014.6836001