Eigenvalues Algorithm used in Histogram ENVI

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Last Post 25 Mar 2013 04:54 AM by anon

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anon

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25 Mar 2013 04:54 AM
When you compute statistics of an image in ENVI, you have option to calculate the covariance of that image too and at the end you will have Eigenvalue for each band. I would appreciate if you explain about the model of calculating this Eigenvalue. In IDL Eigenvalue computes based on (http://www.exelisvis.com/...l#E_841667181_47274) and it is a complex number, how ENVI reports just a number as Eigenvalue for each band ?

MariM

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02 Apr 2013 07:38 AM
ENVI uses only the real part of the eigenvalue. Similar to what is described on this webpage: http://www.sosmath.com/matrix/eigen3/...

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