--- scribo/sandbox/ChangeLog | 4 + scribo/sandbox/z/skewness/skewness.cc | 128 +++++++++++++++++++++++++++++++++ 2 files changed, 132 insertions(+), 0 deletions(-) create mode 100644 scribo/sandbox/z/skewness/skewness.cc diff --git a/scribo/sandbox/ChangeLog b/scribo/sandbox/ChangeLog index 24b948f..10376fc 100644 --- a/scribo/sandbox/ChangeLog +++ b/scribo/sandbox/ChangeLog @@ -1,3 +1,7 @@ +2012-08-23 Guillaume Lazzara <z@lrde.epita.fr> + + * z/skewness/skewness.cc: New. + 2010-11-25 Guillaume Lazzara <z@lrde.epita.fr> Fix encoding issues in xml_transform. diff --git a/scribo/sandbox/z/skewness/skewness.cc b/scribo/sandbox/z/skewness/skewness.cc new file mode 100644 index 0000000..0280fa3 --- /dev/null +++ b/scribo/sandbox/z/skewness/skewness.cc @@ -0,0 +1,128 @@ +#include <mln/io/pgm/all.hh> +#include <mln/io/pbm/all.hh> +#include <mln/core/image/dmorph/image_if.hh> +#include <mln/core/image/dmorph/sub_image.hh> +#include <mln/pw/all.hh> +#include <mln/value/int_u8.hh> +#include <mln/core/image/image2d.hh> +#include <mln/core/neighb.hh> +#include <mln/win/rectangle2d.hh> +#include <mln/extension/adjust.hh> +#include <mln/border/mirror.hh> +#include <mln/extension/duplicate.hh> +#include <mln/core/alias/window2d.hh> + +#include <mln/data/convert.hh> +#include <mln/data/stretch.hh> +#include <mln/debug/println.hh> +#include <mln/data/transform.hh> +#include <mln/fun/v2b/threshold.hh> +#include <mln/io/dump/save.hh> + +mln::image2d<double> skewness; + +#include <scribo/binarization/sauvola.hh> + +namespace mln +{ + + template <typename T, typename N> + std::pair<image2d<double>, image2d<double> > + init_(const image2d<T>& ima, const N& nbh) + { + image2d<double> output_2, output_3; + initialize(output_2, ima); + initialize(output_3, ima); + extension::adjust(ima, nbh); + border::mirror(ima); + + typedef image2d<T> I; + mln_piter(I) p(ima.domain()); + mln_niter(N) n(nbh, p); + + extension::duplicate(ima); + + for_all(p) + { + double sum = ima(p); + for_all(n) + sum += ima(n); + + double mean = sum / (double)nbh.size(); + double + res_2 = std::pow(ima(p) - mean, 2), + res_3 = std::pow(ima(p) - mean, 3); + for_all(n) + { + res_2 += std::pow(ima(n) - mean, 2); + res_3 += std::pow(ima(n) - mean, 3); + } + + output_2(p) = res_2; + output_3(p) = res_3; + } + + return std::pair<image2d<double>, image2d<double> >(output_2, output_3); + } + + +} + + + +int main(int argc, char *argv[]) +{ + using namespace mln; + + if (argc != 4) + { + std::cerr << "Usage: " << argv[0] << " <input.pgm> <prefix> <win_size>" << std::endl; + return 1; + } + + image2d<value::int_u8> input; + io::pgm::load(input, argv[1]); + std::string prefix = argv[2]; + + int win_size = atoi(argv[3]); + win::rectangle2d wr = win::rectangle2d(win_size,win_size); + window2d win; + win.insert(wr); + + std::pair<image2d<double>, image2d<double> > res_init = init_(input, neighb<window2d>(win)); + + image2d<double> x_mean_2 = res_init.first; + image2d<double> x_mean_3 = res_init.second; + + { + io::pgm::save(data::stretch(value::int_u8(), x_mean_2), prefix + "x_mean_2_stretch.pgm"); + io::pgm::save(data::stretch(value::int_u8(), x_mean_3), prefix + "x_mean_3_stretch.pgm"); + } + + + initialize(skewness, x_mean_2); + data::fill(skewness, 0); + + int n; + mln_piter_(image2d<double>) p(skewness.domain()); + for_all(p) + { + n = win.size(); + double frac = std::pow(std::sqrt((1.0/(double)n * x_mean_2(p))), 3); + skewness(p) = (std::sqrt(n * (n - 1)) / (n - 2)) * ((1.0/(double)n * x_mean_3(p)) / frac); + + // if (p == point2d(5, 5)) + // std::cout << p << " - " << std::setprecision(8) << (double)x_mean_3(p) << " - " << (double)x_mean_2(p) << " - " << skewness(p) << std::endl; + } + + + { + io::dump::save(skewness, prefix + "skewness.dump"); + io::pgm::save(data::convert(value::int_u8(), skewness), prefix + "skewness_u8.pgm"); + io::pbm::save(data::transform(skewness, fun::v2b::threshold<double>(0)), prefix + "skewness.pbm"); + io::pgm::save(data::stretch(value::int_u8(), skewness), prefix + "skewness_stretch.pgm"); + } + +// image2d<bool> bin = scribo::binarization::sauvola(input, 51); +// io::pbm::save(bin, "input.pbm"); +} -- 1.7.2.5