LINCR: Library for (piecewise) LINear Continuum Removal 
Author: Brian D. Bue (bbue@rice.edu)

----- Usage -----

Please see README_C.txt or README_PYTHON.txt for usage information for
the standalone (C) and python versions, respectively.

----- Algorithm summary -----

Calculates the continuum-removed signature for a given spectrum. We
first locate the concave inflection points in the spectrum and connect
them via straight line segments, forming the initial approximation to
the continuum. Next we locate the bands for which this piecewise
linear function underestimates the band's reflectance value, and add
those bands to the continuum.

Once the continuum is estimated, the continuum-removed representation
is calculated according to:

cr[i] = spectrum[i]/continuum[i]

where spectrum is the input spectrum, continuum is the estimated
continuum, and i is the index of the ith band.

----- Citation -----

Please cite the following paper if you publish any works using this
code:

B. D. Bue, E. Merényi, and B. Csathó, “Automated Labeling of Materials
in Hyperspectral Imagery,” IEEE Trans. on Geoscience and Remote
Sensing, vol. 48, no. 11, pp. 4059–4070, 2010.

----- Troubleshooting -----

If you receive CR values > 1, try reducing the value of the DIFFEPS
variable in lincr.c.

----- Contact -----

Please contact the author (bbue@rice.edu) if you have any questions
regarding this program.

----- Changelog -----

08/11/14 - added Matlab functions


----- Copyright -----

Copyright 2010-2012 Rice University