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45 lines
2.0 KiB
C++
45 lines
2.0 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/extension/io/jpeg.hpp>
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#include <boost/gil/image_processing/threshold.hpp>
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using namespace boost::gil;
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// Demonstrates thresholding
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// Thresholding can either attribute an arbitrary value to pixels whose values are greater than the threshold
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// or can truncate the pixel values at an arbitrary maximum.
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// In particular, the function threshold_truncate accepts a mode and a direction.
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// Passing threshold_truncate_mode::threshold effectively truncates the values to the threshold, whereas
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// threshold_truncate_mode::zero sets them to 0.
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// The combination of mode and direction controls which pixels are modified:
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// - threshold and regular: truncates the pixels whose values are greater than the threshold
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// - threshold and inverse: truncates the pixels whose values are less than the threshold
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// - zero and regular: zeroes the pixels whose values are less than the threshold
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// - zero and inverse: zeroes the pixels whose values are greater than the threshold
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// See also:
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// adaptive_threshold.cpp - Adaptive thresholding
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int main()
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{
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rgb8_image_t img;
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read_image("test.jpg",img, jpeg_tag{});
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rgb8_image_t img_out(img.dimensions());
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// performing binary threshold on each channel of the image
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// if the pixel value is more than 150 than it will be set to 255 else to 0
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boost::gil::threshold_binary(const_view(img), view(img_out), 150, 255);
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write_view("out-threshold-binary.jpg", view(img_out), jpeg_tag{});
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// if the pixel value is more than 150 than it will be set to 150 else no change
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boost::gil::threshold_truncate(const_view(img), view(img_out), 150, threshold_truncate_mode::threshold);
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write_view("out-threshold-binary_inv.jpg", view(img_out), jpeg_tag{});
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return 0;
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}
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