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Last Post 28 Nov 2013 02:29 AM by  anon
Detailes on ICA algorithm
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anon



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28 Nov 2013 02:29 AM
    I have few questions regarding ICA algorithm in ENVI 5.0. First of all is there any difference between ICA transformation accessed from Menu: Transform-> Independent Components and the one in the SPEAR toolbox? My second question refers to the detailed description of the algorithm behind. I would be grateful if someone could shed some light on the Contrast Function option. What exactly it is referring to and how it affects the algorithm. I don’t want to use ICA as a black-box but the provided description is not sufficient for a deep understanding. Thanks in advance!

    MariM



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    05 Dec 2013 06:26 AM
    The ICA algorithm used in THOR and in the Spectral menu are using the same code base. There are two references in the ENVI Help you can use to investigate how ICA works: References: Hyvarinen, A., and E. Oja, Independent component analysis: algorithms and applications, Neural Networks, vol. 13, no. 4-5, pp. 411-430, 2000. Hyvarinen, A., Fast and robust fixed-point algorithms for independent component analysis, IEEE Trans. Neural Networks, vol. 10, no. 3, pp. 626-634, 1999.
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