2 // Copyright 2019 Olzhas Zhumabek <anonymous.from.applecity@gmail.com>
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)
8 #ifndef BOOST_GIL_IMAGE_PROCESSING_DETAIL_MATH_HPP
9 #define BOOST_GIL_IMAGE_PROCESSING_DETAIL_MATH_HPP
12 #include <boost/gil/extension/numeric/kernel.hpp>
14 namespace boost { namespace gil {
16 static constexpr double pi = 3.14159265358979323846;
18 static constexpr std::array<float, 9> dx_sobel = {-1, 0, 1, -2, 0, 2, -1, 0, 1};
19 static constexpr std::array<float, 9> dx_scharr = {-1, 0, 1, -1, 0, 1, -1, 0, 1};
21 static constexpr std::array<float, 9> dy_sobel = {1, 2, 1, 0, 0, 0, -1, -2, -1};
22 static constexpr std::array<float, 9> dy_scharr = {1, 1, 1, 0, 0, 0, -1, -1, -1};
24 template <typename T, typename Allocator>
25 inline detail::kernel_2d<T, Allocator> get_identity_kernel()
27 detail::kernel_2d<T, Allocator> kernel(1, 0, 0);
32 }} // namespace boost::gil