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<div class="title">numeric.hpp</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Copyright 2019 Olzhas Zhumabek <anonymous.from.applecity@gmail.com></span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Copyright 2021 Pranam Lashkari <plashkari628@gmail.com></span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// Use, modification and distribution are subject to the Boost Software License,</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// http://www.boost.org/LICENSE_1_0.txt)</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#ifndef BOOST_GIL_IMAGE_PROCESSING_NUMERIC_HPP</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#define BOOST_GIL_IMAGE_PROCESSING_NUMERIC_HPP</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>  </div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <boost/gil/image_processing/kernel.hpp></span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include <boost/gil/image_processing/convolve.hpp></span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <boost/gil/image_view.hpp></span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include <boost/gil/typedefs.hpp></span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <boost/gil/detail/math.hpp></span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// fixes ambiguous call to std::abs, https://stackoverflow.com/a/30084734/4593721</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include <cstdlib></span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include <cmath></span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  </div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="keyword">namespace </span><a class="code" href="namespaceboost.html">boost</a> { <span class="keyword">namespace </span>gil {</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  </div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="keyword">inline</span> <span class="keywordtype">double</span> normalized_sinc(<span class="keywordtype">double</span> x)</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> {</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordflow">return</span> std::sin(x * boost::gil::detail::pi) / (x * boost::gil::detail::pi);</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> }</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  </div>
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<div class="line"><a name="l00046"></a><span class="lineno"><a class="line" href="group___image_processing_math.html#gaaa4583e6d012a8b49ad1738cec762651"> 46</a></span> <span class="keyword">inline</span> <span class="keywordtype">double</span> <a class="code" href="group___image_processing_math.html#gaaa4583e6d012a8b49ad1738cec762651">lanczos</a>(<span class="keywordtype">double</span> x, std::ptrdiff_t a)</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> {</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="comment">// means == but <= avoids compiler warning</span></div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">if</span> (0 <= x && x <= 0)</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">return</span> 1;</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  </div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordflow">if</span> (<span class="keyword">static_cast<</span><span class="keywordtype">double</span><span class="keyword">></span>(-a) < x && x < <span class="keyword">static_cast<</span><span class="keywordtype">double</span><span class="keyword">></span>(a))</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">return</span> normalized_sinc(x) / normalized_sinc(x / <span class="keyword">static_cast<</span><span class="keywordtype">double</span><span class="keyword">></span>(a));</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  </div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> }</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  </div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="preprocessor">#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)</span></div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="preprocessor">#pragma warning(push)</span></div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="preprocessor">#pragma warning(disable:4244) </span><span class="comment">// 'argument': conversion from 'const Channel' to 'BaseChannelValue', possible loss of data</span></div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  </div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> compute_tensor_entries(</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  boost::gil::gray16s_view_t dx,</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  boost::gil::gray16s_view_t dy,</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  boost::gil::gray32f_view_t m11,</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  boost::gil::gray32f_view_t m12_21,</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  boost::gil::gray32f_view_t m22)</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> {</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordflow">for</span> (std::ptrdiff_t y = 0; y < dx.height(); ++y) {</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">for</span> (std::ptrdiff_t x = 0; x < dx.width(); ++x) {</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keyword">auto</span> dx_value = dx(x, y);</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keyword">auto</span> dy_value = dy(x, y);</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  m11(x, y) = dx_value * dx_value;</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  m12_21(x, y) = dx_value * dy_value;</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  m22(x, y) = dy_value * dy_value;</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  }</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  }</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> }</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  </div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="preprocessor">#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)</span></div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="preprocessor">#pragma warning(pop)</span></div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  </div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T = <span class="keywordtype">float</span>, <span class="keyword">typename</span> Allocator = std::allocator<T>></div>
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<div class="line"><a name="l00092"></a><span class="lineno"><a class="line" href="group___image_processing_math.html#gadc5ef4af3a887d6f7161e9b67fad5f2f"> 92</a></span> <span class="keyword">inline</span> <span class="keyword">auto</span> <a class="code" href="group___image_processing_math.html#gadc5ef4af3a887d6f7161e9b67fad5f2f">generate_normalized_mean</a>(std::size_t side_length)</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  -> <a class="code" href="classboost_1_1gil_1_1detail_1_1kernel__2d.html">detail::kernel_2d<T, Allocator></a></div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> {</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">if</span> (side_length % 2 != 1)</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">throw</span> std::invalid_argument(<span class="stringliteral">"kernel dimensions should be odd and equal"</span>);</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> entry = 1.0f / <span class="keyword">static_cast<</span><span class="keywordtype">float</span><span class="keyword">></span>(side_length * side_length);</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  </div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <a class="code" href="classboost_1_1gil_1_1detail_1_1kernel__2d.html">detail::kernel_2d<T, Allocator></a> result(side_length, side_length / 2, side_length / 2);</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordflow">for</span> (<span class="keyword">auto</span>& cell: result) {</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  cell = entry;</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  }</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  </div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">return</span> result;</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> }</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  </div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T = <span class="keywordtype">float</span>, <span class="keyword">typename</span> Allocator = std::allocator<T>></div>
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<div class="line"><a name="l00112"></a><span class="lineno"><a class="line" href="group___image_processing_math.html#ga4b14b0baaa6100c287c69bd1c9609364"> 112</a></span> <span class="keyword">inline</span> <span class="keyword">auto</span> <a class="code" href="group___image_processing_math.html#ga4b14b0baaa6100c287c69bd1c9609364">generate_unnormalized_mean</a>(std::size_t side_length)</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  -> <a class="code" href="classboost_1_1gil_1_1detail_1_1kernel__2d.html">detail::kernel_2d<T, Allocator></a></div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> {</div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordflow">if</span> (side_length % 2 != 1)</div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">throw</span> std::invalid_argument(<span class="stringliteral">"kernel dimensions should be odd and equal"</span>);</div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  </div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <a class="code" href="classboost_1_1gil_1_1detail_1_1kernel__2d.html">detail::kernel_2d<T, Allocator></a> result(side_length, side_length / 2, side_length / 2);</div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordflow">for</span> (<span class="keyword">auto</span>& cell: result) {</div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  cell = 1.0f;</div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  }</div>
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  </div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keywordflow">return</span> result;</div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> }</div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  </div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T = <span class="keywordtype">float</span>, <span class="keyword">typename</span> Allocator = std::allocator<T>></div>
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<div class="line"><a name="l00132"></a><span class="lineno"><a class="line" href="group___image_processing_math.html#ga47a665d04688f2d4cb01fe96df76586c"> 132</a></span> <span class="keyword">inline</span> <span class="keyword">auto</span> <a class="code" href="group___image_processing_math.html#ga47a665d04688f2d4cb01fe96df76586c">generate_gaussian_kernel</a>(std::size_t side_length, <span class="keywordtype">double</span> sigma)</div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  -> <a class="code" href="classboost_1_1gil_1_1detail_1_1kernel__2d.html">detail::kernel_2d<T, Allocator></a></div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> {</div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keywordflow">if</span> (side_length % 2 != 1)</div>
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<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordflow">throw</span> std::invalid_argument(<span class="stringliteral">"kernel dimensions should be odd and equal"</span>);</div>
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<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  </div>
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<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keyword">const</span> <span class="keywordtype">double</span> denominator = 2 * boost::gil::detail::pi * sigma * sigma;</div>
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keyword">auto</span> <span class="keyword">const</span> middle = side_length / 2;</div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  std::vector<T, Allocator> values(side_length * side_length);</div>
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<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  T sum{0};</div>
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<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keywordflow">for</span> (std::size_t y = 0; y < side_length; ++y)</div>
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<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  {</div>
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<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="keywordflow">for</span> (std::size_t x = 0; x < side_length; ++x)</div>
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  {</div>
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<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="keyword">const</span> <span class="keyword">auto</span> delta_x = x - middle;</div>
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<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keyword">const</span> <span class="keyword">auto</span> delta_y = y - middle;</div>
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<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="keyword">const</span> <span class="keyword">auto</span> power = <span class="keyword">static_cast<</span><span class="keywordtype">double</span><span class="keyword">></span>(delta_x * delta_x + delta_y * delta_y) / (2 * sigma * sigma);</div>
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<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keyword">const</span> <span class="keywordtype">double</span> nominator = std::exp(-power);</div>
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<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keyword">const</span> <span class="keyword">auto</span> value = <span class="keyword">static_cast<</span>T<span class="keyword">></span>(nominator / denominator);</div>
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<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  values[y * side_length + x] = value;</div>
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<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  sum += value;</div>
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<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  }</div>
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<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  }</div>
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<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  </div>
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<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="comment">// normalize so that Gaussian kernel sums up to 1.</span></div>
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<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  std::transform(values.begin(), values.end(), values.begin(), [&sum](<span class="keyword">const</span> <span class="keyword">auto</span> & v) { return v/sum; });</div>
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<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  </div>
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<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keywordflow">return</span> <a class="code" href="classboost_1_1gil_1_1detail_1_1kernel__2d.html">detail::kernel_2d<T, Allocator></a>(values.begin(), values.size(), middle, middle);</div>
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<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> }</div>
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<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  </div>
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<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T = <span class="keywordtype">float</span>, <span class="keyword">typename</span> Allocator = std::allocator<T>></div>
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<div class="line"><a name="l00170"></a><span class="lineno"><a class="line" href="group___image_processing_math.html#gabf1b8e4d5a0da875263ee3a9353355ac"> 170</a></span> <span class="keyword">inline</span> <span class="keyword">auto</span> <a class="code" href="group___image_processing_math.html#gabf1b8e4d5a0da875263ee3a9353355ac">generate_dx_sobel</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> degree = 1)</div>
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<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  -> <a class="code" href="classboost_1_1gil_1_1detail_1_1kernel__2d.html">detail::kernel_2d<T, Allocator></a></div>
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<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> {</div>
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<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="keywordflow">switch</span> (degree)</div>
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<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  {</div>
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<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keywordflow">case</span> 0:</div>
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<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  {</div>
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<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <span class="keywordflow">return</span> detail::get_identity_kernel<T, Allocator>();</div>
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<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  }</div>
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<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <span class="keywordflow">case</span> 1:</div>
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<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  {</div>
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<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <a class="code" href="classboost_1_1gil_1_1detail_1_1kernel__2d.html">detail::kernel_2d<T, Allocator></a> result(3, 1, 1);</div>
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<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <a class="code" href="group___s_t_l_optimizations.html#ga8e23fe06d31c7cce605e4bf8255e1ee9">std::copy</a>(detail::dx_sobel.begin(), detail::dx_sobel.end(), result.begin());</div>
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<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="keywordflow">return</span> result;</div>
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<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  }</div>
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<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="keywordflow">default</span>:</div>
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<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="keywordflow">throw</span> std::logic_error(<span class="stringliteral">"not supported yet"</span>);</div>
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<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  }</div>
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<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  </div>
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<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="comment">//to not upset compiler</span></div>
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|
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="keywordflow">throw</span> std::runtime_error(<span class="stringliteral">"unreachable statement"</span>);</div>
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<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> }</div>
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<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  </div>
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<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T = <span class="keywordtype">float</span>, <span class="keyword">typename</span> Allocator = std::allocator<T>></div>
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|
<div class="line"><a name="l00201"></a><span class="lineno"><a class="line" href="group___image_processing_math.html#gaf9d35e4abff3c1164917498d67d50a6f"> 201</a></span> <span class="keyword">inline</span> <span class="keyword">auto</span> <a class="code" href="group___image_processing_math.html#gaf9d35e4abff3c1164917498d67d50a6f">generate_dx_scharr</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> degree = 1)</div>
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<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  -> <a class="code" href="classboost_1_1gil_1_1detail_1_1kernel__2d.html">detail::kernel_2d<T, Allocator></a></div>
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<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> {</div>
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<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keywordflow">switch</span> (degree)</div>
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<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  {</div>
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<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keywordflow">case</span> 0:</div>
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<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  {</div>
|
|
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="keywordflow">return</span> detail::get_identity_kernel<T, Allocator>();</div>
|
|
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  }</div>
|
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<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="keywordflow">case</span> 1:</div>
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<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  {</div>
|
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<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <a class="code" href="classboost_1_1gil_1_1detail_1_1kernel__2d.html">detail::kernel_2d<T, Allocator></a> result(3, 1, 1);</div>
|
|
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <a class="code" href="group___s_t_l_optimizations.html#ga8e23fe06d31c7cce605e4bf8255e1ee9">std::copy</a>(detail::dx_scharr.begin(), detail::dx_scharr.end(), result.begin());</div>
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<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <span class="keywordflow">return</span> result;</div>
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<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  }</div>
|
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<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="keywordflow">default</span>:</div>
|
|
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <span class="keywordflow">throw</span> std::logic_error(<span class="stringliteral">"not supported yet"</span>);</div>
|
|
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  }</div>
|
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<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  </div>
|
|
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="comment">//to not upset compiler</span></div>
|
|
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="keywordflow">throw</span> std::runtime_error(<span class="stringliteral">"unreachable statement"</span>);</div>
|
|
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> }</div>
|
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<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  </div>
|
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<div class="line"><a name="l00231"></a><span class="lineno"> 231</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T = <span class="keywordtype">float</span>, <span class="keyword">typename</span> Allocator = std::allocator<T>></div>
|
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<div class="line"><a name="l00232"></a><span class="lineno"><a class="line" href="group___image_processing_math.html#gaf0e135a1b35302f2b4314be87022154e"> 232</a></span> <span class="keyword">inline</span> <span class="keyword">auto</span> <a class="code" href="group___image_processing_math.html#gaf0e135a1b35302f2b4314be87022154e">generate_dy_sobel</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> degree = 1)</div>
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|
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  -> <a class="code" href="classboost_1_1gil_1_1detail_1_1kernel__2d.html">detail::kernel_2d<T, Allocator></a></div>
|
|
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> {</div>
|
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<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <span class="keywordflow">switch</span> (degree)</div>
|
|
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  {</div>
|
|
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keywordflow">case</span> 0:</div>
|
|
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  {</div>
|
|
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="keywordflow">return</span> detail::get_identity_kernel<T, Allocator>();</div>
|
|
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  }</div>
|
|
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  <span class="keywordflow">case</span> 1:</div>
|
|
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  {</div>
|
|
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <a class="code" href="classboost_1_1gil_1_1detail_1_1kernel__2d.html">detail::kernel_2d<T, Allocator></a> result(3, 1, 1);</div>
|
|
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <a class="code" href="group___s_t_l_optimizations.html#ga8e23fe06d31c7cce605e4bf8255e1ee9">std::copy</a>(detail::dy_sobel.begin(), detail::dy_sobel.end(), result.begin());</div>
|
|
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keywordflow">return</span> result;</div>
|
|
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  }</div>
|
|
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="keywordflow">default</span>:</div>
|
|
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <span class="keywordflow">throw</span> std::logic_error(<span class="stringliteral">"not supported yet"</span>);</div>
|
|
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  }</div>
|
|
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  </div>
|
|
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  <span class="comment">//to not upset compiler</span></div>
|
|
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  <span class="keywordflow">throw</span> std::runtime_error(<span class="stringliteral">"unreachable statement"</span>);</div>
|
|
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span> }</div>
|
|
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  </div>
|
|
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T = <span class="keywordtype">float</span>, <span class="keyword">typename</span> Allocator = std::allocator<T>></div>
|
|
<div class="line"><a name="l00263"></a><span class="lineno"><a class="line" href="group___image_processing_math.html#ga98edf189b294eb2db50ed957ed84e815"> 263</a></span> <span class="keyword">inline</span> <span class="keyword">auto</span> <a class="code" href="group___image_processing_math.html#ga98edf189b294eb2db50ed957ed84e815">generate_dy_scharr</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> degree = 1)</div>
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<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  -> <a class="code" href="classboost_1_1gil_1_1detail_1_1kernel__2d.html">detail::kernel_2d<T, Allocator></a> </div>
|
|
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span> {</div>
|
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<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="keywordflow">switch</span> (degree)</div>
|
|
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  {</div>
|
|
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  <span class="keywordflow">case</span> 0:</div>
|
|
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  {</div>
|
|
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  <span class="keywordflow">return</span> detail::get_identity_kernel<T, Allocator>();</div>
|
|
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  }</div>
|
|
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <span class="keywordflow">case</span> 1:</div>
|
|
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  {</div>
|
|
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <a class="code" href="classboost_1_1gil_1_1detail_1_1kernel__2d.html">detail::kernel_2d<T, Allocator></a> result(3, 1, 1);</div>
|
|
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <a class="code" href="group___s_t_l_optimizations.html#ga8e23fe06d31c7cce605e4bf8255e1ee9">std::copy</a>(detail::dy_scharr.begin(), detail::dy_scharr.end(), result.begin());</div>
|
|
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keywordflow">return</span> result;</div>
|
|
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  }</div>
|
|
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <span class="keywordflow">default</span>:</div>
|
|
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="keywordflow">throw</span> std::logic_error(<span class="stringliteral">"not supported yet"</span>);</div>
|
|
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  }</div>
|
|
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  </div>
|
|
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <span class="comment">//to not upset compiler</span></div>
|
|
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  <span class="keywordflow">throw</span> std::runtime_error(<span class="stringliteral">"unreachable statement"</span>);</div>
|
|
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span> }</div>
|
|
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  </div>
|
|
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span> <span class="keyword">template</span> <<span class="keyword">typename</span> GradientView, <span class="keyword">typename</span> OutputView></div>
|
|
<div class="line"><a name="l00296"></a><span class="lineno"><a class="line" href="group___image_processing_math.html#ga5b662d207dd54aba778c0f8c3697c025"> 296</a></span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="group___image_processing_math.html#ga5b662d207dd54aba778c0f8c3697c025">compute_hessian_entries</a>(</div>
|
|
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  GradientView dx,</div>
|
|
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  GradientView dy,</div>
|
|
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  OutputView ddxx,</div>
|
|
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  OutputView dxdy,</div>
|
|
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  OutputView ddyy)</div>
|
|
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span> {</div>
|
|
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  <span class="keyword">auto</span> sobel_x = <a class="code" href="group___image_processing_math.html#gabf1b8e4d5a0da875263ee3a9353355ac">generate_dx_sobel</a>();</div>
|
|
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="keyword">auto</span> sobel_y = <a class="code" href="group___image_processing_math.html#gaf0e135a1b35302f2b4314be87022154e">generate_dy_sobel</a>();</div>
|
|
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  detail::convolve_2d(dx, sobel_x, ddxx);</div>
|
|
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  detail::convolve_2d(dx, sobel_y, dxdy);</div>
|
|
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  detail::convolve_2d(dy, sobel_y, ddyy);</div>
|
|
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span> }</div>
|
|
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  </div>
|
|
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span> }} <span class="comment">// namespace boost::gil</span></div>
|
|
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  </div>
|
|
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span> <span class="preprocessor">#endif</span></div>
|
|
<div class="ttc" id="aclassboost_1_1gil_1_1detail_1_1kernel__2d_html"><div class="ttname"><a href="classboost_1_1gil_1_1detail_1_1kernel__2d.html">boost::gil::detail::kernel_2d</a></div><div class="ttdoc">variable-size kernel</div><div class="ttdef"><b>Definition:</b> kernel.hpp:273</div></div>
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|
<div class="ttc" id="agroup___image_processing_math_html_ga47a665d04688f2d4cb01fe96df76586c"><div class="ttname"><a href="group___image_processing_math.html#ga47a665d04688f2d4cb01fe96df76586c">boost::gil::generate_gaussian_kernel</a></div><div class="ttdeci">auto generate_gaussian_kernel(std::size_t side_length, double sigma) -> detail::kernel_2d< T, Allocator ></div><div class="ttdoc">Generate Gaussian kernel.</div><div class="ttdef"><b>Definition:</b> numeric.hpp:132</div></div>
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|
<div class="ttc" id="agroup___image_processing_math_html_ga4b14b0baaa6100c287c69bd1c9609364"><div class="ttname"><a href="group___image_processing_math.html#ga4b14b0baaa6100c287c69bd1c9609364">boost::gil::generate_unnormalized_mean</a></div><div class="ttdeci">auto generate_unnormalized_mean(std::size_t side_length) -> detail::kernel_2d< T, Allocator ></div><div class="ttdoc">Generate kernel with all 1s.</div><div class="ttdef"><b>Definition:</b> numeric.hpp:112</div></div>
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|
<div class="ttc" id="agroup___image_processing_math_html_ga5b662d207dd54aba778c0f8c3697c025"><div class="ttname"><a href="group___image_processing_math.html#ga5b662d207dd54aba778c0f8c3697c025">boost::gil::compute_hessian_entries</a></div><div class="ttdeci">void compute_hessian_entries(GradientView dx, GradientView dy, OutputView ddxx, OutputView dxdy, OutputView ddyy)</div><div class="ttdoc">Compute xy gradient, and second order x and y gradients.</div><div class="ttdef"><b>Definition:</b> numeric.hpp:296</div></div>
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<div class="ttc" id="agroup___image_processing_math_html_ga98edf189b294eb2db50ed957ed84e815"><div class="ttname"><a href="group___image_processing_math.html#ga98edf189b294eb2db50ed957ed84e815">boost::gil::generate_dy_scharr</a></div><div class="ttdeci">auto generate_dy_scharr(unsigned int degree=1) -> detail::kernel_2d< T, Allocator ></div><div class="ttdoc">Generate Scharr operator in vertical direction.</div><div class="ttdef"><b>Definition:</b> numeric.hpp:263</div></div>
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<div class="ttc" id="agroup___image_processing_math_html_gaaa4583e6d012a8b49ad1738cec762651"><div class="ttname"><a href="group___image_processing_math.html#gaaa4583e6d012a8b49ad1738cec762651">boost::gil::lanczos</a></div><div class="ttdeci">double lanczos(double x, std::ptrdiff_t a)</div><div class="ttdoc">Lanczos response at point x.</div><div class="ttdef"><b>Definition:</b> numeric.hpp:46</div></div>
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<div class="ttc" id="agroup___image_processing_math_html_gabf1b8e4d5a0da875263ee3a9353355ac"><div class="ttname"><a href="group___image_processing_math.html#gabf1b8e4d5a0da875263ee3a9353355ac">boost::gil::generate_dx_sobel</a></div><div class="ttdeci">auto generate_dx_sobel(unsigned int degree=1) -> detail::kernel_2d< T, Allocator ></div><div class="ttdoc">Generates Sobel operator in horizontal direction.</div><div class="ttdef"><b>Definition:</b> numeric.hpp:170</div></div>
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<div class="ttc" id="agroup___image_processing_math_html_gadc5ef4af3a887d6f7161e9b67fad5f2f"><div class="ttname"><a href="group___image_processing_math.html#gadc5ef4af3a887d6f7161e9b67fad5f2f">boost::gil::generate_normalized_mean</a></div><div class="ttdeci">auto generate_normalized_mean(std::size_t side_length) -> detail::kernel_2d< T, Allocator ></div><div class="ttdoc">Generate mean kernel.</div><div class="ttdef"><b>Definition:</b> numeric.hpp:92</div></div>
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<div class="ttc" id="agroup___image_processing_math_html_gaf0e135a1b35302f2b4314be87022154e"><div class="ttname"><a href="group___image_processing_math.html#gaf0e135a1b35302f2b4314be87022154e">boost::gil::generate_dy_sobel</a></div><div class="ttdeci">auto generate_dy_sobel(unsigned int degree=1) -> detail::kernel_2d< T, Allocator ></div><div class="ttdoc">Generates Sobel operator in vertical direction.</div><div class="ttdef"><b>Definition:</b> numeric.hpp:232</div></div>
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<div class="ttc" id="agroup___image_processing_math_html_gaf9d35e4abff3c1164917498d67d50a6f"><div class="ttname"><a href="group___image_processing_math.html#gaf9d35e4abff3c1164917498d67d50a6f">boost::gil::generate_dx_scharr</a></div><div class="ttdeci">auto generate_dx_scharr(unsigned int degree=1) -> detail::kernel_2d< T, Allocator ></div><div class="ttdoc">Generate Scharr operator in horizontal direction.</div><div class="ttdef"><b>Definition:</b> numeric.hpp:201</div></div>
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<div class="ttc" id="agroup___s_t_l_optimizations_html_ga8e23fe06d31c7cce605e4bf8255e1ee9"><div class="ttname"><a href="group___s_t_l_optimizations.html#ga8e23fe06d31c7cce605e4bf8255e1ee9">std::copy</a></div><div class="ttdeci">BOOST_FORCEINLINE auto copy(boost::gil::pixel< T, CS > *first, boost::gil::pixel< T, CS > *last, boost::gil::pixel< T, CS > *dst) -> boost::gil::pixel< T, CS > *</div><div class="ttdoc">Copy when both src and dst are interleaved and of the same type can be just memmove.</div><div class="ttdef"><b>Definition:</b> algorithm.hpp:145</div></div>
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<div class="ttc" id="anamespaceboost_html"><div class="ttname"><a href="namespaceboost.html">boost</a></div><div class="ttdoc">defined(BOOST_NO_CXX17_HDR_MEMORY_RESOURCE)</div><div class="ttdef"><b>Definition:</b> algorithm.hpp:36</div></div>
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