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716fe9ad8c
Add public functions threshold_binary and threshold_truncate. Add tests and example. Closes #310
119 lines
5.2 KiB
C++
119 lines
5.2 KiB
C++
//
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// Copyright 2019 Miral Shah <miralshah2211@gmail.com>
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//
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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#include <boost/gil/image_processing/threshold.hpp>
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#include <boost/gil/image_view.hpp>
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#include <boost/gil/algorithm.hpp>
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#include <boost/gil/gray.hpp>
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#include <boost/core/lightweight_test.hpp>
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namespace gil = boost::gil;
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int main()
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{
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int height = 4;
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int width = 4;
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gil::gray8_image_t original(width, height), threshold(width, height),
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expected(width, height);
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//filling original view's upper half part with gray pixels of value 50
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//filling original view's lower half part with gray pixels of value 150
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gil::fill_pixels(gil::subimage_view(gil::view(original), 0, 0, original.width(),
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original.height() / 2), gil::gray8_pixel_t(50));
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gil::fill_pixels(gil::subimage_view(gil::view(original), 0, original.height() / 2,
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original.width(), original.height() / 2), gil::gray8_pixel_t(150));
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/*--------------------------------Mode Threshold------------------------------------*/
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/*-------------------------------Direction Regular----------------------------------*/
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//expected view after thresholding of the original view with threshold value of 100
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//filling expected view's upper half part with gray pixels of value 50
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//filling expected view's lower half part with gray pixels of value 100
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gil::fill_pixels(gil::subimage_view(gil::view(expected), 0, 0, original.width(),
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original.height() / 2), gil::gray8_pixel_t(50));
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gil::fill_pixels(gil::subimage_view(gil::view(expected), 0, original.height() / 2,
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original.width(), original.height() / 2), gil::gray8_pixel_t(100));
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gil::threshold_truncate(gil::view(original), gil::view(threshold), 100);
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//comparing threshold view generated by the function with the expected view
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BOOST_TEST(gil::equal_pixels(gil::view(threshold), gil::view(expected)));
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/*--------------------------------Mode Threshold------------------------------------*/
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/*-------------------------------Direction Inverse----------------------------------*/
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//expected view after thresholding of the original view with threshold value of 100
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//filling expected view's upper half part with gray pixels of value 100
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//filling expected view's lower half part with gray pixels of value 150
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gil::fill_pixels(gil::subimage_view(gil::view(expected), 0, 0, original.width(),
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original.height() / 2), gil::gray8_pixel_t(100));
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gil::fill_pixels(gil::subimage_view(gil::view(expected), 0, original.height() / 2,
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original.width(), original.height() / 2), gil::gray8_pixel_t(150));
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gil::threshold_truncate
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(
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gil::view(original),
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gil::view(threshold),
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100,
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gil::threshold_truncate_mode::threshold,
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gil::threshold_direction::inverse
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);
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//comparing threshold view generated by the function with the expected view
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BOOST_TEST(gil::equal_pixels(gil::view(threshold), gil::view(expected)));
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/*-----------------------------------Mode Zero--------------------------------------*/
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/*-------------------------------Direction Regular----------------------------------*/
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//expected view after thresholding of the original view with threshold value of 100
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//filling expected view's upper half part with gray pixels of value 0
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//filling expected view's lower half part with gray pixels of value 150
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gil::fill_pixels(gil::subimage_view(gil::view(expected), 0, 0, original.width(),
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original.height() / 2), gil::gray8_pixel_t(0));
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gil::fill_pixels(gil::subimage_view(gil::view(expected), 0, original.height() / 2,
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original.width(), original.height() / 2), gil::gray8_pixel_t(150));
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gil::threshold_truncate
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(
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gil::view(original),
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gil::view(threshold),
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100,
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gil::threshold_truncate_mode::zero,
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gil::threshold_direction::regular
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);
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//comparing threshold view generated by the function with the expected view
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BOOST_TEST(gil::equal_pixels(gil::view(threshold), gil::view(expected)));
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/*-----------------------------------Mode Zero--------------------------------------*/
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/*-------------------------------Direction Inverse----------------------------------*/
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//expected view after thresholding of the original view with threshold value of 100
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//filling expected view's upper half part with gray pixels of value 50
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//filling expected view's lower half part with gray pixels of value 0
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gil::fill_pixels(gil::subimage_view(gil::view(expected), 0, 0, original.width(),
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original.height() / 2), gil::gray8_pixel_t(50));
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gil::fill_pixels(gil::subimage_view(gil::view(expected), 0, original.height() / 2,
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original.width(), original.height() / 2), gil::gray8_pixel_t(0));
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gil::threshold_truncate
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(
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gil::view(original),
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gil::view(threshold),
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100,
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gil::threshold_truncate_mode::zero,
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gil::threshold_direction::inverse
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);
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//comparing threshold view generated by the function with the expected view
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BOOST_TEST(gil::equal_pixels(gil::view(threshold), gil::view(expected)));
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return boost::report_errors();
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}
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