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<div class="headertitle"><div class="title">histogram_matching.hpp</div></div>
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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">//</span></div>
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<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment">// Copyright 2020 Debabrata Mandal <mandaldebabrata123@gmail.com></span></div>
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<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment">//</span></div>
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<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</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 id="l00005" name="l00005"></a><span class="lineno"> 5</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 id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment">// http://www.boost.org/LICENSE_1_0.txt)</span></div>
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<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment">//</span></div>
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<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span> </div>
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<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#ifndef BOOST_GIL_IMAGE_PROCESSING_HISTOGRAM_MATCHING_HPP</span></div>
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<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="preprocessor">#define BOOST_GIL_IMAGE_PROCESSING_HISTOGRAM_MATCHING_HPP</span></div>
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<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span> </div>
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<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="preprocessor">#include <boost/gil/algorithm.hpp></span></div>
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<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="preprocessor">#include <boost/gil/histogram.hpp></span></div>
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<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="preprocessor">#include <boost/gil/image.hpp></span></div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span> </div>
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="preprocessor">#include <algorithm></span></div>
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="preprocessor">#include <cmath></span></div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="preprocessor">#include <map></span></div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="preprocessor">#include <vector></span></div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span> </div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceboost.html">boost</a> { <span class="keyword">namespace </span>gil {</div>
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<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span> </div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> </div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span><span class="keyword">template</span> <<span class="keyword">typename</span> SrcKeyType, <span class="keyword">typename</span> RefKeyType></div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span><span class="keyword">auto</span> histogram_matching(histogram<SrcKeyType> <span class="keyword">const</span>& src_hist, histogram<RefKeyType> <span class="keyword">const</span>& ref_hist)</div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> -> std::map<SrcKeyType, SrcKeyType></div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span>{</div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> histogram<SrcKeyType> dst_hist;</div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> <span class="keywordflow">return</span> histogram_matching(src_hist, ref_hist, dst_hist);</div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span>}</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> </div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span><span class="keyword">template</span> <<span class="keyword">typename</span> SrcKeyType, <span class="keyword">typename</span> RefKeyType, <span class="keyword">typename</span> DstKeyType></div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span><span class="keyword">auto</span> histogram_matching(</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> histogram<SrcKeyType> <span class="keyword">const</span>& src_hist,</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> histogram<RefKeyType> <span class="keyword">const</span>& ref_hist,</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> histogram<DstKeyType>& dst_hist)</div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> -> std::map<SrcKeyType, DstKeyType></div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span>{</div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="keyword">static_assert</span>(</div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> std::is_integral<SrcKeyType>::value &&</div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> std::is_integral<RefKeyType>::value &&</div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> std::is_integral<DstKeyType>::value,</div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> <span class="stringliteral">"Source, Reference or Destination histogram type is not appropriate."</span>);</div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> </div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> <span class="keyword">using </span>value_t = <span class="keyword">typename</span> histogram<SrcKeyType>::value_type;</div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> dst_hist.clear();</div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> <span class="keywordtype">double</span> src_sum = src_hist.sum();</div>
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> <span class="keywordtype">double</span> ref_sum = ref_hist.sum();</div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> <span class="keyword">auto</span> cumltv_srchist = cumulative_histogram(src_hist);</div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> <span class="keyword">auto</span> cumltv_refhist = cumulative_histogram(ref_hist);</div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> std::map<SrcKeyType, RefKeyType> inverse_mapping;</div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> </div>
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> std::vector<typename histogram<RefKeyType>::key_type> src_keys, ref_keys;</div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> src_keys = src_hist.sorted_keys();</div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> ref_keys = ref_hist.sorted_keys();</div>
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<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> std::ptrdiff_t start = ref_keys.size() - 1;</div>
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<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> RefKeyType ref_max;</div>
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<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> <span class="keywordflow">if</span> (start >= 0)</div>
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<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> ref_max = std::get<0>(ref_keys[start]);</div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> </div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> <span class="keywordflow">for</span> (std::ptrdiff_t j = src_keys.size() - 1; j >= 0; --j)</div>
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> {</div>
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<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> <span class="keywordtype">double</span> src_val = (cumltv_srchist[src_keys[j]] * ref_sum) / src_sum;</div>
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<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> <span class="keywordflow">while</span> (cumltv_refhist[ref_keys[start]] > src_val && start > 0)</div>
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<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> {</div>
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<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> start--;</div>
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<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> }</div>
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<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> <span class="keywordflow">if</span> (std::abs(cumltv_refhist[ref_keys[start]] - src_val) ></div>
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<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> std::abs(cumltv_refhist(std::min<RefKeyType>(ref_max, std::get<0>(ref_keys[start + 1]))) -</div>
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<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> src_val))</div>
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<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> {</div>
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<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> inverse_mapping[std::get<0>(src_keys[j])] =</div>
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<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> std::min<RefKeyType>(ref_max, std::get<0>(ref_keys[start + 1]));</div>
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<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> }</div>
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<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> <span class="keywordflow">else</span></div>
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<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> {</div>
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<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> inverse_mapping[std::get<0>(src_keys[j])] = std::get<0>(ref_keys[start]);</div>
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<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> }</div>
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<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> <span class="keywordflow">if</span> (j == 0)</div>
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<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> <span class="keywordflow">break</span>;</div>
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<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> }</div>
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<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> std::for_each(src_hist.begin(), src_hist.end(), [&](value_t <span class="keyword">const</span>& v) {</div>
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<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> dst_hist[inverse_mapping[std::get<0>(v.first)]] += v.second;</div>
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<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> });</div>
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<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> <span class="keywordflow">return</span> inverse_mapping;</div>
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<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span>}</div>
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<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> </div>
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<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span><span class="keyword">template</span> <<span class="keyword">typename</span> SrcView, <span class="keyword">typename</span> ReferenceView, <span class="keyword">typename</span> DstView></div>
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<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span><span class="keywordtype">void</span> histogram_matching(</div>
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<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span> SrcView <span class="keyword">const</span>& src_view,</div>
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<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> ReferenceView <span class="keyword">const</span>& ref_view,</div>
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<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span> DstView <span class="keyword">const</span>& dst_view,</div>
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<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> std::size_t bin_width = 1,</div>
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<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> <span class="keywordtype">bool</span> mask = <span class="keyword">false</span>,</div>
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<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> std::vector<std::vector<bool>> src_mask = {},</div>
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<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> std::vector<std::vector<bool>> ref_mask = {})</div>
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<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span>{</div>
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<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span> gil_function_requires<ImageViewConcept<SrcView>>();</div>
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<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span> gil_function_requires<ImageViewConcept<ReferenceView>>();</div>
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<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span> gil_function_requires<MutableImageViewConcept<DstView>>();</div>
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<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span> </div>
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<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span> <span class="keyword">static_assert</span>(</div>
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<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span> color_spaces_are_compatible<</div>
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<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> <span class="keyword">typename</span> color_space_type<SrcView>::type,</div>
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<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span> <span class="keyword">typename</span> color_space_type<ReferenceView>::type>::value,</div>
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<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span> <span class="stringliteral">"Source and reference view must have same color space"</span>);</div>
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<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> </div>
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<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span> <span class="keyword">static_assert</span>(</div>
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<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span> color_spaces_are_compatible<</div>
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<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span> <span class="keyword">typename</span> color_space_type<SrcView>::type,</div>
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<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span> <span class="keyword">typename</span> color_space_type<DstView>::type>::value,</div>
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<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span> <span class="stringliteral">"Source and destination view must have same color space"</span>);</div>
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<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span> </div>
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<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span> <span class="comment">// Defining channel type</span></div>
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<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span> <span class="keyword">using </span>source_channel_t = <span class="keyword">typename</span> channel_type<SrcView>::type;</div>
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<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span> <span class="keyword">using </span>ref_channel_t = <span class="keyword">typename</span> channel_type<ReferenceView>::type;</div>
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<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span> <span class="keyword">using </span>dst_channel_t = <span class="keyword">typename</span> channel_type<DstView>::type;</div>
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<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span> <span class="keyword">using </span>coord_t = <span class="keyword">typename</span> SrcView::x_coord_t;</div>
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<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span> </div>
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<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span> std::size_t <span class="keyword">const</span> channels = num_channels<SrcView>::value;</div>
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<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span> coord_t <span class="keyword">const</span> width = src_view.width();</div>
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<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span> coord_t <span class="keyword">const</span> height = src_view.height();</div>
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<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"> 169</span> source_channel_t src_pixel_min = (std::numeric_limits<source_channel_t>::min)();</div>
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<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span> source_channel_t src_pixel_max = (std::numeric_limits<source_channel_t>::max)();</div>
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<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"> 171</span> ref_channel_t ref_pixel_min = (std::numeric_limits<ref_channel_t>::min)();</div>
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<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span> ref_channel_t ref_pixel_max = (std::numeric_limits<ref_channel_t>::max)();</div>
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<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span> </div>
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<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"> 174</span> <span class="keywordflow">for</span> (std::size_t i = 0; i < channels; i++)</div>
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<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span> {</div>
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<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span> histogram<source_channel_t> src_histogram;</div>
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<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"> 177</span> histogram<ref_channel_t> ref_histogram;</div>
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<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span> fill_histogram(</div>
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<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span> nth_channel_view(src_view, i), src_histogram, bin_width, <span class="keyword">false</span>, <span class="keyword">false</span>, mask, src_mask,</div>
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<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span> std::tuple<source_channel_t>(src_pixel_min),</div>
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<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span> std::tuple<source_channel_t>(src_pixel_max), <span class="keyword">true</span>);</div>
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<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span> fill_histogram(</div>
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<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span> nth_channel_view(ref_view, i), ref_histogram, bin_width, <span class="keyword">false</span>, <span class="keyword">false</span>, mask, ref_mask,</div>
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<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span> std::tuple<ref_channel_t>(ref_pixel_min), std::tuple<ref_channel_t>(ref_pixel_max),</div>
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<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span> <span class="keyword">true</span>);</div>
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<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span> <span class="keyword">auto</span> inverse_mapping = histogram_matching(src_histogram, ref_histogram);</div>
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<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"> 187</span> <span class="keywordflow">for</span> (std::ptrdiff_t src_y = 0; src_y < height; ++src_y)</div>
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<div class="line"><a id="l00188" name="l00188"></a><span class="lineno"> 188</span> {</div>
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<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span> <span class="keyword">auto</span> src_it = nth_channel_view(src_view, i).row_begin(src_y);</div>
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<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span> <span class="keyword">auto</span> dst_it = nth_channel_view(dst_view, i).row_begin(src_y);</div>
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<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span> <span class="keywordflow">for</span> (std::ptrdiff_t src_x = 0; src_x < width; ++src_x)</div>
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<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span> {</div>
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<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span> <span class="keywordflow">if</span> (mask && !src_mask[src_y][src_x])</div>
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<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span> dst_it[src_x][0] = src_it[src_x][0];</div>
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<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span> <span class="keywordflow">else</span></div>
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<div class="line"><a id="l00196" name="l00196"></a><span class="lineno"> 196</span> dst_it[src_x][0] =</div>
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<div class="line"><a id="l00197" name="l00197"></a><span class="lineno"> 197</span> <span class="keyword">static_cast<</span>dst_channel_t<span class="keyword">></span>(inverse_mapping[src_it[src_x][0]]);</div>
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<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"> 198</span> }</div>
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<div class="line"><a id="l00199" name="l00199"></a><span class="lineno"> 199</span> }</div>
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<div class="line"><a id="l00200" name="l00200"></a><span class="lineno"> 200</span> }</div>
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<div class="line"><a id="l00201" name="l00201"></a><span class="lineno"> 201</span>}</div>
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<div class="line"><a id="l00202" name="l00202"></a><span class="lineno"> 202</span> </div>
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<div class="line"><a id="l00203" name="l00203"></a><span class="lineno"> 203</span>}} <span class="comment">//namespace boost::gil</span></div>
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<div class="line"><a id="l00204" name="l00204"></a><span class="lineno"> 204</span> </div>
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<div class="line"><a id="l00205" name="l00205"></a><span class="lineno"> 205</span><span class="preprocessor">#endif</span></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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