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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">//</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Copyright 2019 Miral Shah <miralshah2211@gmail.com></span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">//</span></div><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><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><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><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">//</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#ifndef BOOST_GIL_IMAGE_PROCESSING_THRESHOLD_HPP</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#define BOOST_GIL_IMAGE_PROCESSING_THRESHOLD_HPP</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <limits></span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <boost/gil/image.hpp></span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">namespace </span><a class="code" href="namespaceboost.html">boost</a> { <span class="keyword">namespace </span>gil {</div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">namespace </span>detail {</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">template</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="keyword">typename</span> SourceChannelT,</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keyword">typename</span> ResultChannelT,</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keyword">typename</span> SrcView,</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keyword">typename</span> DstView,</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="keyword">typename</span> Operator</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> ></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="keywordtype">void</span> threshold_impl(SrcView <span class="keyword">const</span>& src_view, DstView <span class="keyword">const</span>& dst_view, Operator <span class="keyword">const</span>& threshold_op)</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> {</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  gil_function_requires<ImageViewConcept<SrcView>>();</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  gil_function_requires<MutableImageViewConcept<DstView>>();</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  gil_function_requires<ColorSpacesCompatibleConcept</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keyword">typename</span> color_space_type<SrcView>::type,</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keyword">typename</span> color_space_type<DstView>::type></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  >();</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  static_assert(color_spaces_are_compatible</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keyword">typename</span> color_space_type<SrcView>::type,</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keyword">typename</span> color_space_type<DstView>::type</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  >::value, <span class="stringliteral">"Source and destination views must have pixels with the same color space"</span>);</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="comment">//iterate over the image chaecking each pixel value for the threshold</span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">for</span> (std::ptrdiff_t y = 0; y < src_view.height(); y++)</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  {</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keyword">typename</span> SrcView::x_iterator src_it = src_view.row_begin(y);</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keyword">typename</span> DstView::x_iterator dst_it = dst_view.row_begin(y);</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordflow">for</span> (std::ptrdiff_t x = 0; x < src_view.width(); x++)</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  {</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  static_transform(src_it[x], dst_it[x], threshold_op);</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  }</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  }</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> }</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> </div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> } <span class="comment">//namespace boost::gil::detail</span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> </div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="keyword">enum class</span> threshold_direction { regular, inverse };</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="keyword">enum class</span> threshold_optimal_value { otsu, triangle };</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="keyword">enum class</span> threshold_truncate_mode { threshold, zero };</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> </div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="keyword">template</span> <<span class="keyword">typename</span> SrcView, <span class="keyword">typename</span> DstView></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="keywordtype">void</span> threshold_binary</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> (</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  SrcView <span class="keyword">const</span>& src_view,</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  DstView <span class="keyword">const</span>& dst_view,</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keyword">typename</span> channel_type<DstView>::type threshold_value,</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keyword">typename</span> channel_type<DstView>::type max_value,</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  threshold_direction direction = threshold_direction::regular</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> )</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> {</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="comment">//deciding output channel type and creating functor</span></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> channel_type<SrcView>::type source_channel_t;</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> channel_type<DstView>::type result_channel_t;</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> </div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordflow">if</span> (direction == threshold_direction::regular)</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  {</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  detail::threshold_impl<source_channel_t, result_channel_t>(src_view, dst_view,</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  [threshold_value, max_value](source_channel_t px) -> result_channel_t {</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">return</span> px > threshold_value ? max_value : 0;</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  });</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  }</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  {</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  detail::threshold_impl<source_channel_t, result_channel_t>(src_view, dst_view,</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  [threshold_value, max_value](source_channel_t px) -> result_channel_t {</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">return</span> px > threshold_value ? 0 : max_value;</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  });</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  }</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> }</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> </div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="keyword">template</span> <<span class="keyword">typename</span> SrcView, <span class="keyword">typename</span> DstView></div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="keywordtype">void</span> threshold_binary</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> (</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  SrcView <span class="keyword">const</span>& src_view,</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  DstView <span class="keyword">const</span>& dst_view,</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keyword">typename</span> channel_type<DstView>::type threshold_value,</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  threshold_direction direction = threshold_direction::regular</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span> )</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> {</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> channel_type<DstView>::type result_channel_t;</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  result_channel_t max_value = std::numeric_limits<result_channel_t>::max();</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  threshold_binary(src_view, dst_view, threshold_value, max_value, direction);</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span> }</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="keyword">template</span> <<span class="keyword">typename</span> SrcView, <span class="keyword">typename</span> DstView></div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="keywordtype">void</span> threshold_truncate</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span> (</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  SrcView <span class="keyword">const</span>& src_view,</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  DstView <span class="keyword">const</span>& dst_view,</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keyword">typename</span> channel_type<DstView>::type threshold_value,</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  threshold_truncate_mode mode = threshold_truncate_mode::threshold,</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  threshold_direction direction = threshold_direction::regular</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span> )</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span> {</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="comment">//deciding output channel type and creating functor</span></div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> channel_type<SrcView>::type source_channel_t;</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> channel_type<DstView>::type result_channel_t;</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span> </div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  std::function<result_channel_t(source_channel_t)> threshold_logic;</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span> </div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="keywordflow">if</span> (mode == threshold_truncate_mode::threshold)</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  {</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="keywordflow">if</span> (direction == threshold_direction::regular)</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  {</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  detail::threshold_impl<source_channel_t, result_channel_t>(src_view, dst_view,</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  [threshold_value](source_channel_t px) -> result_channel_t {</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordflow">return</span> px > threshold_value ? threshold_value : px;</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  });</div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  }</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  {</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  detail::threshold_impl<source_channel_t, result_channel_t>(src_view, dst_view,</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  [threshold_value](source_channel_t px) -> result_channel_t {</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keywordflow">return</span> px > threshold_value ? px : threshold_value;</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  });</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  }</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  }</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  {</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keywordflow">if</span> (direction == threshold_direction::regular)</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  {</div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  detail::threshold_impl<source_channel_t, result_channel_t>(src_view, dst_view,</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  [threshold_value](source_channel_t px) -> result_channel_t {</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="keywordflow">return</span> px > threshold_value ? px : 0;</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  });</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  }</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  {</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  detail::threshold_impl<source_channel_t, result_channel_t>(src_view, dst_view,</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  [threshold_value](source_channel_t px) -> result_channel_t {</div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordflow">return</span> px > threshold_value ? 0 : px;</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  });</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  }</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  }</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span> }</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span> </div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span> }} <span class="comment">//namespace boost::gil</span></div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span> </div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span> <span class="preprocessor">#endif //BOOST_GIL_IMAGE_PROCESSING_THRESHOLD_HPP</span></div><div class="ttc" id="namespaceboost_html"><div class="ttname"><a href="namespaceboost.html">boost</a></div><div class="ttdef"><b>Definition:</b> algorithm.hpp:30</div></div>
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