require 'nn'

require 'image'

require 'xlua'

op = xlua.OptionParser('%prog [options]')

opt,args = op:parse()

local im = image.load(args[1])

im = im:squeeze()

if im:nDimension() == 3 then

im = image.rgb2y(im)

end

local out = nn.SpatialContrastiveNormalization(1,image.gaussian1D(17)):forward(im)

image.save('tmp.png', out)