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

   1 //
   2 // Copyright 2019 Miral Shah <miralshah2211@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/threshold.hpp>
   9 #include <boost/gil/image_view.hpp>
  10 #include <boost/gil/algorithm.hpp>
  11 #include <boost/gil/gray.hpp>
  12 #include <boost/core/lightweight_test.hpp>
  13
  14
  15 namespace gil = boost::gil;
  16
  17 int height = 4;
  18 int width = 4;
  19
  20 gil::gray8_image_t original_gray(width, height), threshold_gray(width, height),
  21 expected_gray(width, height);
  22
  23 gil::rgb8_image_t original_rgb(width, height), threshold_rgb(width, height),
  24 expected_rgb(width, height);
  25
  26
  27 void fill_original_gray()
  28 {
  29     //filling original_gray view's upper half part with gray pixels of value 50
  30     //filling original_gray view's lower half part with gray pixels of value 150
  31     gil::fill_pixels(gil::subimage_view(gil::view(original_gray), 0, 0, original_gray.width(),
  32         original_gray.height() / 2), gil::gray8_pixel_t(50));
  33     gil::fill_pixels(gil::subimage_view(gil::view(original_gray), 0, original_gray.height() / 2,
  34         original_gray.width(), original_gray.height() / 2), gil::gray8_pixel_t(150));
  35 }
  36
  37 void fill_original_rgb()
  38 {
  39     //filling original_rgb view's upper half part with rgb pixels of value 50, 155, 115
  40     //filling original_rgb view's lower half part with rgb pixels of value 203, 9, 60
  41     gil::fill_pixels(gil::subimage_view(gil::view(original_rgb), 0, 0, original_rgb.width(),
  42         original_rgb.height() / 2), gil::rgb8_pixel_t(50, 155, 115));
  43     gil::fill_pixels(gil::subimage_view(gil::view(original_rgb), 0, original_rgb.height() / 2,
  44         original_rgb.width(), original_rgb.height() / 2), gil::rgb8_pixel_t(203, 9, 60));
  45 }
  46
  47 void binary_gray_to_gray()
  48 {
  49     //expected_gray view after thresholding of the original_gray view with threshold_gray value of 100
  50     //filling expected_gray view's upper half part with gray pixels of value 0
  51     //filling expected_gray view's lower half part with gray pixels of value 255
  52     gil::fill_pixels(gil::subimage_view(gil::view(expected_gray), 0, 0, original_gray.width(),
  53         original_gray.height() / 2), gil::gray8_pixel_t(0));
  54     gil::fill_pixels(gil::subimage_view(gil::view(expected_gray), 0, original_gray.height() / 2,
  55         original_gray.width(), original_gray.height() / 2), gil::gray8_pixel_t(255));
  56
  57     gil::threshold_binary(gil::view(original_gray), gil::view(threshold_gray), 100);
  58
  59     //comparing threshold_gray view generated by the function with the expected_gray view
  60     BOOST_TEST(gil::equal_pixels(gil::view(threshold_gray), gil::view(expected_gray)));
  61 }
  62
  63 void binary_inverse_gray_to_gray()
  64 {
  65     //expected_gray view after thresholding of the original_gray view with threshold_gray value of 100
  66     //filling expected_gray view's upper half part with gray pixels of value 200
  67     //filling expected_gray view's lower half part with gray pixels of value 0
  68     gil::fill_pixels(gil::subimage_view(gil::view(expected_gray), 0, 0, original_gray.width(),
  69         original_gray.height() / 2), gil::gray8_pixel_t(200));
  70     gil::fill_pixels(gil::subimage_view(gil::view(expected_gray), 0, original_gray.height() / 2,
  71         original_gray.width(), original_gray.height() / 2), gil::gray8_pixel_t(0));
  72
  73     gil::threshold_binary
  74     (
  75         gil::view(original_gray),
  76         gil::view(threshold_gray),
  77         100,
  78         200,
  79         gil::threshold_direction::inverse
  80     );
  81
  82     //comparing threshold_gray view generated by the function with the expected_gray view
  83     BOOST_TEST(gil::equal_pixels(gil::view(threshold_gray), gil::view(expected_gray)));
  84 }
  85
  86 void binary_rgb_to_rgb()
  87 {
  88     //expected_rgb view after thresholding of the original_rgb view with threshold value of 100
  89     //filling expected_rgb view's upper half part with rgb pixels of value 0, 165, 165
  90     //filling expected_rgb view's lower half part with rgb pixels of value 165, 0, 0
  91     gil::fill_pixels(gil::subimage_view(gil::view(expected_rgb), 0, 0, original_rgb.width(),
  92         original_rgb.height() / 2), gil::rgb8_pixel_t(0, 165, 165));
  93     gil::fill_pixels(gil::subimage_view(gil::view(expected_rgb), 0, original_rgb.height() / 2,
  94         original_rgb.width(), original_rgb.height() / 2), gil::rgb8_pixel_t(165, 0, 0));
  95
  96     gil::threshold_binary(gil::view(original_rgb), gil::view(threshold_rgb), 100, 165);
  97
  98     //comparing threshold_rgb view generated by the function with the expected_rgb view
  99     BOOST_TEST(gil::equal_pixels(gil::view(threshold_rgb), gil::view(expected_rgb)));
 100 }
 101
 102 void binary_inverse_rgb_to_rgb()
 103 {
 104     //expected_rgb view after thresholding of the original_rgb view with threshold value of 100
 105     //filling expected_rgb view's upper half part with rgb pixels of value 90, 0, 0
 106     //filling expected_rgb view's lower half part with rgb pixels of value 0, 90, 90
 107     gil::fill_pixels(gil::subimage_view(gil::view(expected_rgb), 0, 0, original_rgb.width(),
 108         original_rgb.height() / 2), gil::rgb8_pixel_t(90, 0, 0));
 109     gil::fill_pixels(gil::subimage_view(gil::view(expected_rgb), 0, original_rgb.height() / 2,
 110         original_rgb.width(), original_rgb.height() / 2), gil::rgb8_pixel_t(0, 90, 90));
 111
 112     gil::threshold_binary
 113     (
 114         gil::view(original_rgb),
 115         gil::view(threshold_rgb),
 116         100,
 117         90,
 118         gil::threshold_direction::inverse
 119     );
 120
 121     //comparing threshold_rgb view generated by the function with the expected_rgb view
 122     BOOST_TEST(gil::equal_pixels(gil::view(threshold_rgb), gil::view(expected_rgb)));
 123 }
 124
 125
 126 int main()
 127 {
 128     fill_original_gray();
 129     fill_original_rgb();
 130
 131     binary_gray_to_gray();
 132     binary_inverse_gray_to_gray();
 133     binary_rgb_to_rgb();
 134     binary_inverse_rgb_to_rgb();
 135
 136     return boost::report_errors();
 137 }