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- //
- // Copyright 2019 Miral Shah <miralshah2211@gmail.com>
- //
- // Use, modification and distribution are subject to the Boost Software License,
- // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- //
- #include <boost/gil/image_processing/threshold.hpp>
- #include <boost/gil/image_view.hpp>
- #include <boost/gil/algorithm.hpp>
- #include <boost/gil/gray.hpp>
- #include <boost/core/lightweight_test.hpp>
- namespace gil = boost::gil;
- int height = 4;
- int width = 4;
- gil::gray8_image_t original_gray(width, height), threshold_gray(width, height),
- expected_gray(width, height);
- gil::rgb8_image_t original_rgb(width, height), threshold_rgb(width, height),
- expected_rgb(width, height);
- void fill_original_gray()
- {
- //filling original_gray view's upper half part with gray pixels of value 50
- //filling original_gray view's lower half part with gray pixels of value 150
- gil::fill_pixels(gil::subimage_view(gil::view(original_gray), 0, 0, original_gray.width(),
- original_gray.height() / 2), gil::gray8_pixel_t(50));
- gil::fill_pixels(gil::subimage_view(gil::view(original_gray), 0, original_gray.height() / 2,
- original_gray.width(), original_gray.height() / 2), gil::gray8_pixel_t(150));
- }
- void fill_original_rgb()
- {
- //filling original_rgb view's upper half part with rgb pixels of value 50, 155, 115
- //filling original_rgb view's lower half part with rgb pixels of value 203, 9, 60
- gil::fill_pixels(gil::subimage_view(gil::view(original_rgb), 0, 0, original_rgb.width(),
- original_rgb.height() / 2), gil::rgb8_pixel_t(50, 155, 115));
- gil::fill_pixels(gil::subimage_view(gil::view(original_rgb), 0, original_rgb.height() / 2,
- original_rgb.width(), original_rgb.height() / 2), gil::rgb8_pixel_t(203, 9, 60));
- }
- void binary_gray_to_gray()
- {
- //expected_gray view after thresholding of the original_gray view with threshold_gray value of 100
- //filling expected_gray view's upper half part with gray pixels of value 0
- //filling expected_gray view's lower half part with gray pixels of value 255
- gil::fill_pixels(gil::subimage_view(gil::view(expected_gray), 0, 0, original_gray.width(),
- original_gray.height() / 2), gil::gray8_pixel_t(0));
- gil::fill_pixels(gil::subimage_view(gil::view(expected_gray), 0, original_gray.height() / 2,
- original_gray.width(), original_gray.height() / 2), gil::gray8_pixel_t(255));
- gil::threshold_binary(gil::view(original_gray), gil::view(threshold_gray), 100);
- //comparing threshold_gray view generated by the function with the expected_gray view
- BOOST_TEST(gil::equal_pixels(gil::view(threshold_gray), gil::view(expected_gray)));
- }
- void binary_inverse_gray_to_gray()
- {
- //expected_gray view after thresholding of the original_gray view with threshold_gray value of 100
- //filling expected_gray view's upper half part with gray pixels of value 200
- //filling expected_gray view's lower half part with gray pixels of value 0
- gil::fill_pixels(gil::subimage_view(gil::view(expected_gray), 0, 0, original_gray.width(),
- original_gray.height() / 2), gil::gray8_pixel_t(200));
- gil::fill_pixels(gil::subimage_view(gil::view(expected_gray), 0, original_gray.height() / 2,
- original_gray.width(), original_gray.height() / 2), gil::gray8_pixel_t(0));
- gil::threshold_binary
- (
- gil::view(original_gray),
- gil::view(threshold_gray),
- 100,
- 200,
- gil::threshold_direction::inverse
- );
- //comparing threshold_gray view generated by the function with the expected_gray view
- BOOST_TEST(gil::equal_pixels(gil::view(threshold_gray), gil::view(expected_gray)));
- }
- void binary_rgb_to_rgb()
- {
- //expected_rgb view after thresholding of the original_rgb view with threshold value of 100
- //filling expected_rgb view's upper half part with rgb pixels of value 0, 165, 165
- //filling expected_rgb view's lower half part with rgb pixels of value 165, 0, 0
- gil::fill_pixels(gil::subimage_view(gil::view(expected_rgb), 0, 0, original_rgb.width(),
- original_rgb.height() / 2), gil::rgb8_pixel_t(0, 165, 165));
- gil::fill_pixels(gil::subimage_view(gil::view(expected_rgb), 0, original_rgb.height() / 2,
- original_rgb.width(), original_rgb.height() / 2), gil::rgb8_pixel_t(165, 0, 0));
- gil::threshold_binary(gil::view(original_rgb), gil::view(threshold_rgb), 100, 165);
- //comparing threshold_rgb view generated by the function with the expected_rgb view
- BOOST_TEST(gil::equal_pixels(gil::view(threshold_rgb), gil::view(expected_rgb)));
- }
- void binary_inverse_rgb_to_rgb()
- {
- //expected_rgb view after thresholding of the original_rgb view with threshold value of 100
- //filling expected_rgb view's upper half part with rgb pixels of value 90, 0, 0
- //filling expected_rgb view's lower half part with rgb pixels of value 0, 90, 90
- gil::fill_pixels(gil::subimage_view(gil::view(expected_rgb), 0, 0, original_rgb.width(),
- original_rgb.height() / 2), gil::rgb8_pixel_t(90, 0, 0));
- gil::fill_pixels(gil::subimage_view(gil::view(expected_rgb), 0, original_rgb.height() / 2,
- original_rgb.width(), original_rgb.height() / 2), gil::rgb8_pixel_t(0, 90, 90));
- gil::threshold_binary
- (
- gil::view(original_rgb),
- gil::view(threshold_rgb),
- 100,
- 90,
- gil::threshold_direction::inverse
- );
- //comparing threshold_rgb view generated by the function with the expected_rgb view
- BOOST_TEST(gil::equal_pixels(gil::view(threshold_rgb), gil::view(expected_rgb)));
- }
- int main()
- {
- fill_original_gray();
- fill_original_rgb();
-
- binary_gray_to_gray();
- binary_inverse_gray_to_gray();
- binary_rgb_to_rgb();
- binary_inverse_rgb_to_rgb();
- return boost::report_errors();
- }
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