URL: https://svn.lrde.epita.fr/svn/oln/trunk/milena ChangeLog: 2009-03-20 Fabien Freling <fabien.freling@lrde.epita.fr> Fix subsample() routine. * mln/world/binary_2d/subsample.hh: Fix. --- subsample.hh | 29 ++++++++++++++++++++++------- 1 file changed, 22 insertions(+), 7 deletions(-) Index: trunk/milena/mln/world/binary_2d/subsample.hh =================================================================== --- trunk/milena/mln/world/binary_2d/subsample.hh (revision 3557) +++ trunk/milena/mln/world/binary_2d/subsample.hh (revision 3558) @@ -45,33 +45,48 @@ namespace binary_2d { - image2d<value::int_u8> subsample(const image2d<bool>& input, unsigned n) + image2d<value::int_u8> subsample(image2d<bool>& input, unsigned n) { - bool* ptr = new bool[n]; + using value::int_u8; + + const bool** ptr = new const bool*[n]; const unsigned nrows = input.nrows() / n; const unsigned ncols = input.ncols() / n; - image2d<value::int_u8> output; - initialize(output, input); + algebra::vec<2, unsigned int> vmin; + algebra::vec<2, unsigned int> vmax; + vmin[0] = 0; + vmin[1] = 0; + vmax[0] = nrows - 1; + vmax[1] = ncols - 1; + point2d pmin(vmin); + point2d pmax(vmax); + image2d<int_u8> output(box<point2d>(pmin, pmax)); dpoint2d dp_row(1, 0); const unsigned delta_row = input.delta_index(dp_row); + unsigned count = 0; for (unsigned row = 0; row < nrows; ++row) { - unsigned count = 0; ptr[0] = & input(point2d(n * row, 0)); for (unsigned i = 1; i < n; ++i) ptr[i] = ptr[i - 1] + delta_row; for (unsigned col = 0; col < ncols; ++col) { - for (unsigned i = 0; i < n; ++i, ++ptr) + count = 0; + for (unsigned i = 0; i < n; ++i) { - if (ptr[i]) + for (unsigned j = 0; j < n; ++j, ++(ptr[i])) + { + if (*(ptr[i])) ++count; } + } output(point2d(row, col)) = count * 255 / n / n; } } + + return output; } } // end of namespace mln::world::binary_2d