Does virtual dimensionality work in hyperspectral images?

Peter Bajorski

doi:10.1117/12.818172

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27 April 2009 Does virtual dimensionality work in hyperspectral images?

Peter Bajorski

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Proceedings Volume 7334, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XV; 73341J (2009) https://doi.org/10.1117/12.818172
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

The effective dimensionality (ED) of hyperspectral images is often viewed as the dimensionality of an affine subspace defined by linear combinations of spectra of materials present in the image. That affine subspace is expected to give an acceptable approximation to all pixels. At this point, there is no precise definition of ED. In an effort to assess ED, a notion of virtual dimensionality (VD) has been developed, and it is being used in many papers including those published in TGARS. The ever- spreading use of VD warrants its thorough investigation. In this paper, we investigate properties of VD, and we show that VD largely depends on the average value of all spectra rather than on ED. We show specific examples when VD would give entirely misleading results. We also explain fallacies associated with justifications for VD.

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Peter Bajorski "Does virtual dimensionality work in hyperspectral images?", Proc. SPIE 7334, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XV, 73341J (27 April 2009); https://doi.org/10.1117/12.818172

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