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## light normalization using Self-Quotient Image approach
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> selfQuotientImage ./images/1002.pgm out.pgm
> ls out.pgm

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## light normalization using Gross and Brajovic algorithm (resolution with multigrid V-cycle)
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> diffusionVcycle -histo -n_grids 5 -lambda 0.1 -type 2 images/1002.pgm out.pgm
> ls out.pgm

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## light normalization using Gross and Brajovic algorithm (resolution with Gauss-Seidel relaxation)
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> relaxation -steps 20 -type 0 -lambda 1 images/1002.pgm out.pgm
> ls out.pgm