1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
//
// Copyright 2019 Olzhas Zhumabek <anonymous.from.applecity@gmail.com>
// Copyright 2021 Pranam Lashkari <plashkari628@gmail.com>
//
// Distributed under 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/typedefs.hpp>
#include <boost/gil/image_processing/numeric.hpp>
#include <boost/gil/extension/io/png.hpp>
#include <boost/gil/image_processing/convolve.hpp>
#include <string>
#include <iostream>
namespace gil = boost::gil;
// Demonstrates the use of Sobel and Scharr filters to detect edges
// The example generates a couple of images representing respectively the result of
// applying the filter horizontally and vertically.
// The functions generating the filters (or kernels) are defined in include/boost/gil/image_processing/numeric.hpp.
int main(int argc, char* argv[])
{
if (argc != 5)
{
std::cerr << "usage: " << argv[0] << ": <input.png> <sobel|scharr> <output-x.png> <output-y.png>\n";
return -1;
}
gil::gray8_image_t input_image;
gil::read_image(argv[1], input_image, gil::png_tag{});
auto input = gil::view(input_image);
auto filter_type = std::string(argv[2]);
gil::gray16_image_t dx_image(input_image.dimensions());
auto dx = gil::view(dx_image);
gil::gray16_image_t dy_image(input_image.dimensions());
auto dy = gil::view(dy_image);
if (filter_type == "sobel")
{
gil::detail::convolve_2d(input, gil::generate_dx_sobel(1), dx);
gil::detail::convolve_2d(input, gil::generate_dy_sobel(1), dy);
}
else if (filter_type == "scharr")
{
gil::detail::convolve_2d(input, gil::generate_dx_scharr(1), dx);
gil::detail::convolve_2d(input, gil::generate_dy_scharr(1), dy);
}
else
{
std::cerr << "unrecognized gradient filter type. Must be either sobel or scharr\n";
return -1;
}
gil::write_view(argv[3], dx, gil::png_tag{});
gil::write_view(argv[4], dy, gil::png_tag{});
}
|
