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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> </div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#ifndef BOOST_GIL_IMAGE_PROCESSING_FILTER_HPP</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#define BOOST_GIL_IMAGE_PROCESSING_FILTER_HPP</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> </div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <boost/gil/extension/numeric/algorithm.hpp></span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include <boost/gil/extension/numeric/kernel.hpp></span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <boost/gil/extension/numeric/convolve.hpp></span></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> <span class="preprocessor">#include <boost/gil/image.hpp></span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <boost/gil/image_view.hpp></span></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="preprocessor">#include <cstddef></span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include <vector></span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {</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="keyword">template</span> <<span class="keyword">typename</span> SrcView, <span class="keyword">typename</span> DstView></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="keywordtype">void</span> box_filter(</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  SrcView <span class="keyword">const</span>& src_view,</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  DstView <span class="keyword">const</span>& dst_view,</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  std::size_t kernel_size,</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keywordtype">long</span> <span class="keywordtype">int</span> anchor = -1,</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keywordtype">bool</span> normalize=<span class="keyword">true</span>,</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  boundary_option option = boundary_option::extend_zero</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> {</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  gil_function_requires<ImageViewConcept<SrcView>>();</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  gil_function_requires<MutableImageViewConcept<DstView>>();</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  static_assert(color_spaces_are_compatible</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keyword">typename</span> color_space_type<SrcView>::type,</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keyword">typename</span> color_space_type<DstView>::type</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  >::value, <span class="stringliteral">"Source and destination views must have pixels with the same color space"</span>);</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>  std::vector<float> kernel_values;</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">if</span> (normalize) { kernel_values.resize(kernel_size, 1.0f / <span class="keywordtype">float</span>(kernel_size)); }</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">else</span> { kernel_values.resize(kernel_size, 1.0f); }</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> </div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">if</span> (anchor == -1) anchor = static_cast<int>(kernel_size / 2);</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  kernel_1d<float> kernel(kernel_values.begin(), kernel_size, anchor);</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>  detail::convolve_1d</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>  pixel<float, typename SrcView::value_type::layout_t></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  >(src_view, kernel, dst_view, option);</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> </div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="keyword">template</span> <<span class="keyword">typename</span> SrcView, <span class="keyword">typename</span> DstView></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="keywordtype">void</span> blur(</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  SrcView <span class="keyword">const</span>& src_view,</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  DstView <span class="keyword">const</span>& dst_view,</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  std::size_t kernel_size,</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordtype">long</span> <span class="keywordtype">int</span> anchor = -1,</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  boundary_option option = boundary_option::extend_zero</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> )</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> {</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  box_filter(src_view, dst_view, kernel_size, anchor, <span class="keyword">true</span>, option);</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> }</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </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> <span class="keyword">namespace </span>detail</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> {</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="keyword">template</span> <<span class="keyword">typename</span> SrcView, <span class="keyword">typename</span> DstView></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="keywordtype">void</span> filter_median_impl(SrcView <span class="keyword">const</span>& src_view, DstView <span class="keyword">const</span>& dst_view, std::size_t kernel_size)</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> {</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  std::size_t half_kernel_size = kernel_size / 2;</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">using</span> src_channel_t = <span class="keyword">typename</span> channel_type<SrcView>::type;</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> </div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  std::vector<src_channel_t> values;</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  values.reserve(kernel_size * kernel_size);</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>  <span class="keywordflow">for</span> (std::ptrdiff_t y = 0; y < src_view.height(); y++)</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  {</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keyword">typename</span> DstView::x_iterator dst_it = dst_view.row_begin(y);</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>  <span class="keywordflow">for</span> (std::ptrdiff_t x = 0; x < src_view.width(); x++)</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  {</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keyword">auto</span> sub_view = subimage_view(</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  src_view,</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  x - half_kernel_size, y - half_kernel_size,</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  kernel_size,</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  kernel_size</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>  values.assign(sub_view.begin(), sub_view.end());</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> </div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  std::nth_element(values.begin(), values.begin() + (values.size() / 2), values.end());</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  dst_it[x] = values[values.size() / 2];</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  }</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  }</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> }</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> } <span class="comment">// namespace detail</span></div><div class="line"><a name="l00104"></a><span class="lineno"> 104</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> median_filter(SrcView <span class="keyword">const</span>& src_view, DstView <span class="keyword">const</span>& dst_view, std::size_t kernel_size)</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>  static_assert(color_spaces_are_compatible</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keyword">typename</span> color_space_type<SrcView>::type,</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keyword">typename</span> color_space_type<DstView>::type</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  >::value, <span class="stringliteral">"Source and destination views must have pixels with the same color space"</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>  std::size_t half_kernel_size = kernel_size / 2;</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keyword">auto</span> extended_img = extend_boundary(</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  src_view,</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  half_kernel_size,</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  boundary_option::extend_constant</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  );</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keyword">auto</span> extended_view = subimage_view(</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <a class="code" href="group___image_model.html#ga633557dbbff2d21c784b73412b47bb38">view</a>(extended_img),</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  half_kernel_size,</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  half_kernel_size,</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  src_view.width(),</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  src_view.height()</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  );</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span> </div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordflow">for</span> (std::size_t channel = 0; channel < extended_view.num_channels(); channel++)</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  {</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  detail::filter_median_impl(</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  nth_channel_view(extended_view, channel),</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  nth_channel_view(dst_view, channel),</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  kernel_size</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  );</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  }</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span> }</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span> </div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span> }} <span class="comment">//namespace boost::gil</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="preprocessor">#endif // !BOOST_GIL_IMAGE_PROCESSING_FILTER_HPP</span></div><div class="ttc" id="group___image_model_html_ga633557dbbff2d21c784b73412b47bb38"><div class="ttname"><a href="group___image_model.html#ga633557dbbff2d21c784b73412b47bb38">boost::gil::view</a></div><div class="ttdeci">const image< Pixel, IsPlanar, Alloc >::view_t & view(image< Pixel, IsPlanar, Alloc > &img)</div><div class="ttdoc">Returns the non-constant-pixel view of an image.</div><div class="ttdef"><b>Definition:</b> image.hpp:443</div></div>
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