[IPOL discuss] use of Eigen for PCA/SVD computation in demo blm_color_dimensional_filtering

[David.Tschumperle at greyc.ensicaen.fr]

Just to add a precision about CImg...

> - CImg:
> I tried what David proposed and it worked fine
> (except for a bug in the compilation line, it should be:
> g++ -o toto toto.cpp -Dcimg_display_type=0)
>
> The only drawback is that I don't need a whole image processing library,
> just a linear algebra library

Don't be afraid with that, as CImg is header-based, the only code that
will be indeed compiled
(and that will appear in the final executable) is indeed the minimal
set of CImg functions required for
the eigenvalue computation (it means probably some constructors and
few other functions but not
all the library of course!).

-- 
-----------------------------------------------------------------------------
David Tschumperlé
CNRS Researcher
GREYC (UMR-CNRS 6072)         E-mail: David.Tschumperle at greyc.ensicaen.fr
6, Bd du Marechal Juin        Tel: +33 (0)2-31-45-29-24
F-14050 CAEN Cedex            Fax: +33 (0)2-31-45-26-98
France                        http://www.greyc.ensicaen.fr/~dtschump
-----------------------------------------------------------------------------