ceph/src/boost/libs/gil/test/core/image_processing/simple_kernels.cpp

   1 //
   2 // Copyright 2019 Olzhas Zhumabek <anonymous.from.applecity@gmail.com>
   3 //
   4 // Use, modification and distribution are subject to the Boost Software License,
   5 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   6 // http://www.boost.org/LICENSE_1_0.txt)
   7 //
   8 #include <boost/gil/image_processing/numeric.hpp>
   9 #include <boost/gil/image.hpp>
  10 #include <boost/gil/image_view.hpp>
  11 #include <boost/gil/typedefs.hpp>
  12 #include <boost/core/lightweight_test.hpp>
  13
  14 namespace gil = boost::gil;
  15
  16 void test_normalized_mean_generation()
  17 {
  18     auto kernel = gil::generate_normalized_mean(5);
  19     for (const auto& cell: kernel)
  20     {
  21         const auto expected_value = static_cast<float>(1 / 25.f);
  22         BOOST_TEST(cell == expected_value);
  23     }
  24 }
  25
  26 void test_unnormalized_mean_generation()
  27 {
  28     auto kernel = gil::generate_unnormalized_mean(5);
  29     for (const auto& cell: kernel)
  30     {
  31         BOOST_TEST(cell == 1.0f);
  32     }
  33 }
  34
  35 void test_gaussian_kernel_generation()
  36 {
  37     auto kernel = boost::gil::generate_gaussian_kernel(7, 0.84089642);
  38     const float expected_values[7][7] =
  39     {
  40         {0.00000067f, 0.00002292f, 0.00019117f, 0.00038771f, 0.00019117f, 0.00002292f, 0.00000067f},
  41         {0.00002292f, 0.00078633f, 0.00655965f, 0.01330373f, 0.00655965f, 0.00078633f, 0.00002292f},
  42         {0.00019117f, 0.00655965f, 0.05472157f, 0.11098164f, 0.05472157f, 0.00655965f, 0.00019117f},
  43         {0.00038771f, 0.01330373f, 0.11098164f, 0.25508352f, 0.11098164f, 0.01330373f, 0.00038711f},
  44         {0.00019117f, 0.00655965f, 0.05472157f, 0.11098164f, 0.05472157f, 0.00655965f, 0.00019117f},
  45         {0.00002292f, 0.00078633f, 0.00655965f, 0.01330373f, 0.00655965f, 0.00078633f, 0.00002292f},
  46         {0.00000067f, 0.00002292f, 0.00019117f, 0.00038771f, 0.00019117f, 0.00002292f, 0.00000067f}
  47     };
  48
  49     for (gil::gray32f_view_t::coord_t y = 0; static_cast<std::size_t>(y) < kernel.size(); ++y)
  50     {
  51         for (gil::gray32f_view_t::coord_t x = 0; static_cast<std::size_t>(x) < kernel.size(); ++x)
  52         {
  53             auto output = kernel.at(static_cast<std::size_t>(x), static_cast<std::size_t>(y));
  54             auto expected = expected_values[y][x];
  55             auto percent_difference = std::ceil(std::abs(expected - output) / expected);
  56             BOOST_TEST(percent_difference < 5);
  57         }
  58     }
  59 }
  60
  61 int main()
  62 {
  63     test_normalized_mean_generation();
  64     test_unnormalized_mean_generation();
  65     test_gaussian_kernel_generation();
  66     return boost::report_errors();
  67 }