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<div class="title">histogram_equalization.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 2020 Debabrata Mandal <mandaldebabrata123@gmail.com></span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">//</span></div>
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<div class="line"><a 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 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 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 name="l00007"></a><span class="lineno"> 7</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#ifndef BOOST_GIL_IMAGE_PROCESSING_HISTOGRAM_EQUALIZATION_HPP</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#define BOOST_GIL_IMAGE_PROCESSING_HISTOGRAM_EQUALIZATION_HPP</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  </div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <boost/gil/histogram.hpp></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.hpp></span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  </div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <cmath></span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include <map></span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <vector></span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  </div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</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="l00036"></a><span class="lineno"> 36</span>  </div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="keyword">template</span> <<span class="keyword">typename</span> SrcKeyType></div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> std::map<SrcKeyType, SrcKeyType> histogram_equalization(histogram<SrcKeyType> <span class="keyword">const</span>& src_hist)</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> {</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  histogram<SrcKeyType> dst_hist;</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordflow">return</span> histogram_equalization(src_hist, dst_hist);</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> }</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  </div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="keyword">template</span> <<span class="keyword">typename</span> SrcKeyType, <span class="keyword">typename</span> DstKeyType></div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> std::map<SrcKeyType, DstKeyType></div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  histogram_equalization(histogram<SrcKeyType> <span class="keyword">const</span>& src_hist, histogram<DstKeyType>& dst_hist)</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> {</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  static_assert(</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  std::is_integral<SrcKeyType>::value &&</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  std::is_integral<DstKeyType>::value,</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="stringliteral">"Source and destination histogram types are not appropriate"</span>);</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="keyword">using</span> value_t = <span class="keyword">typename</span> histogram<SrcKeyType>::value_type;</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  dst_hist.clear();</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordtype">double</span> sum = src_hist.sum();</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  SrcKeyType min_key = std::numeric_limits<DstKeyType>::min();</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  SrcKeyType max_key = std::numeric_limits<DstKeyType>::max();</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keyword">auto</span> cumltv_srchist = cumulative_histogram(src_hist);</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  std::map<SrcKeyType, DstKeyType> color_map;</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  std::for_each(cumltv_srchist.begin(), cumltv_srchist.end(), [&](value_t <span class="keyword">const</span>& v) {</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  DstKeyType trnsfrmd_key =</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  static_cast<DstKeyType>((v.second * (max_key - min_key)) / sum + min_key);</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  color_map[std::get<0>(v.first)] = trnsfrmd_key;</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  });</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</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 name="l00083"></a><span class="lineno"> 83</span>  dst_hist[color_map[std::get<0>(v.first)]] += v.second;</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="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">return</span> color_map;</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> }</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  </div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="keyword">template</span> <<span class="keyword">typename</span> SrcView, <span class="keyword">typename</span> DstView></div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="keywordtype">void</span> histogram_equalization(</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  SrcView <span class="keyword">const</span>& src_view,</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  DstView <span class="keyword">const</span>& dst_view,</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  std::size_t bin_width = 1,</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordtype">bool</span> mask = <span class="keyword">false</span>,</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  std::vector<std::vector<bool>> src_mask = {})</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>  gil_function_requires<ImageViewConcept<SrcView>>();</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  gil_function_requires<MutableImageViewConcept<DstView>>();</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  </div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  static_assert(</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  color_spaces_are_compatible<</div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keyword">typename</span> color_space_type<SrcView>::type,</div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keyword">typename</span> color_space_type<DstView>::type>::value,</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="stringliteral">"Source and destination views must have same color space"</span>);</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="comment">// Defining channel type</span></div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</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 name="l00117"></a><span class="lineno"> 117</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 name="l00118"></a><span class="lineno"> 118</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 name="l00119"></a><span class="lineno"> 119</span>  </div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  std::size_t <span class="keyword">const</span> channels = num_channels<SrcView>::value;</div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  coord_t <span class="keyword">const</span> width = src_view.width();</div>
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  coord_t <span class="keyword">const</span> height = src_view.height();</div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  std::size_t pixel_max = std::numeric_limits<dst_channel_t>::max();</div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  std::size_t pixel_min = std::numeric_limits<dst_channel_t>::min();</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="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">for</span> (std::size_t i = 0; i < channels; i++)</div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  {</div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  histogram<source_channel_t> h;</div>
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  fill_histogram(<a class="code" href="group___image_view_transformations_nth_channel.html#gad976e8c51016d9cdbb47d57ab2ce8717">nth_channel_view</a>(src_view, i), h, bin_width, <span class="keyword">false</span>, <span class="keyword">false</span>, mask, src_mask);</div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  h.normalize();</div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="keyword">auto</span> h2 = cumulative_histogram(h);</div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</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 name="l00133"></a><span class="lineno"> 133</span>  {</div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keyword">auto</span> src_it = <a class="code" href="group___image_view_transformations_nth_channel.html#gad976e8c51016d9cdbb47d57ab2ce8717">nth_channel_view</a>(src_view, i).row_begin(src_y);</div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keyword">auto</span> dst_it = <a class="code" href="group___image_view_transformations_nth_channel.html#gad976e8c51016d9cdbb47d57ab2ce8717">nth_channel_view</a>(dst_view, i).row_begin(src_y);</div>
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<div class="line"><a name="l00136"></a><span class="lineno"> 136</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 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="keywordflow">if</span> (mask && !src_mask[src_y][src_x])</div>
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  dst_it[src_x][0] = channel_convert<dst_channel_t>(src_it[src_x][0]);</div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="keywordflow">else</span></div>
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<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  dst_it[src_x][0] = <span class="keyword">static_cast<</span>dst_channel_t<span class="keyword">></span>(</div>
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<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  h2[src_it[src_x][0]] * (pixel_max - pixel_min) + pixel_min);</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>  }</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> }</div>
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<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  </div>
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<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> }} <span class="comment">//namespace boost::gil</span></div>
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<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  </div>
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<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="preprocessor">#endif</span></div>
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</div><!-- fragment --></div><!-- contents -->
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<div class="ttc" id="agroup___image_view_transformations_nth_channel_html_gad976e8c51016d9cdbb47d57ab2ce8717"><div class="ttname"><a href="group___image_view_transformations_nth_channel.html#gad976e8c51016d9cdbb47d57ab2ce8717">boost::gil::nth_channel_view</a></div><div class="ttdeci">nth_channel_view_type< View >::type nth_channel_view(const View &src, int n)</div><div class="ttdef"><b>Definition:</b> image_view_factory.hpp:418</div></div>
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