contrib/mul/vimt/vimt_image_pyramid.txx

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// This is mul/vimt/vimt_image_pyramid.txx
#ifndef vimt_image_pyramid_txx_
#define vimt_image_pyramid_txx_
//:
// \file

#include "vimt_image_pyramid.h"

#include <vcl_cstdlib.h> // for abort()
#include <vcl_cassert.h>

//------------------------------------------------------------------------
//: Convert an image pyramid into a flat image containing each layer.
template <class T> void vimt_image_pyramid_flatten(T& out, const vimt_image_pyramid & in)
{
  if (!out.is_class("vimt_image_2d"))
  {
    vcl_cerr<< "ERROR: vimt_image_pyramid_flatten(const vimt_image_pyramid &)\n"
            << "Don't know how to deal with image type "<< in(0).is_a() << '\n';
    vcl_abort();
  }

  const int n_levels = in.n_levels();
  assert(n_levels > 0);
  assert(out.is_a() == in(0).is_a());

  unsigned width = 0;
  for (int i =0; i<n_levels; ++i)
    width += static_cast<const vimt_image_2d&>(in(i)).image_base().ni();

  const unsigned nplanes = static_cast<const vimt_image_2d&>(in(0)).image_base().nplanes();
  unsigned height = static_cast<const vimt_image_2d&>(in(0)).image_base().nj();
  out.image().set_size(width, height, nplanes);
  out.image().fill(0);

  for (int i=0, offset=0; i<n_levels; ++i)
  {
    const T& im_i = static_cast<const T&>(in(i));
    const int ni = im_i.image().ni();
    const int nj = im_i.image().nj();

    for (unsigned int p=0;p<nplanes;++p)
      for (int y=0;y<nj;++y)
        for (int x=0;x<ni;++x)
          out.image()(x+offset, y, p) = im_i.image()(x, y, p);

    offset+=ni;
  }
}


#undef VIMT_IMAGE_PYRAMID_INSTANTIATE
#define VIMT_IMAGE_PYRAMID_INSTANTIATE(T) \
template void vimt_image_pyramid_flatten(T &, const vimt_image_pyramid &)

#endif //vimt_image_pyramid_txx_

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