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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>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment">// Copyright 2019 Olzhas Zhumabek &lt;anonymous.from.applecity@gmail.com&gt;</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment">//</span></div>
<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>
<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>
<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>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment">//</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#ifndef BOOST_GIL_IMAGE_PROCESSING_HARRIS_HPP</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#define BOOST_GIL_IMAGE_PROCESSING_HARRIS_HPP</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span> </div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="preprocessor">#include &lt;boost/gil/image_view.hpp&gt;</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="preprocessor">#include &lt;boost/gil/typedefs.hpp&gt;</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="preprocessor">#include &lt;boost/gil/image_processing/kernel.hpp&gt;</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span> </div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceboost.html">boost</a> { <span class="keyword">namespace </span>gil {</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> </div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span> </div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> Allocator&gt;</div>
<div class="foldopen" id="foldopen00034" data-start="{" data-end="}">
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"><a class="line" href="group___corner_detection_algorithms.html#ga02ddb898d6f546ee25c448c4095f9d94"> 34</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="group___corner_detection_algorithms.html#ga02ddb898d6f546ee25c448c4095f9d94">compute_harris_responses</a>(</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> boost::gil::gray32f_view_t m11,</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> boost::gil::gray32f_view_t m12_21,</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> boost::gil::gray32f_view_t m22,</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> <a class="code hl_class" href="classboost_1_1gil_1_1detail_1_1kernel__2d.html">boost::gil::detail::kernel_2d&lt;T, Allocator&gt;</a> weights,</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> <span class="keywordtype">float</span> k,</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> boost::gil::gray32f_view_t harris_response)</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span>{</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> <span class="keywordflow">if</span> (m11.dimensions() != m12_21.dimensions() || m12_21.dimensions() != m22.dimensions()) {</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> <span class="keywordflow">throw</span> std::invalid_argument(<span class="stringliteral">&quot;m prefixed arguments must represent&quot;</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> <span class="stringliteral">&quot; tensor from the same image&quot;</span>);</div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> }</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> </div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> std::ptrdiff_t <span class="keyword">const</span> window_length = weights.size();</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="keyword">auto</span> <span class="keyword">const</span> width = m11.width();</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> <span class="keyword">auto</span> <span class="keyword">const</span> height = m11.height();</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> <span class="keyword">auto</span> <span class="keyword">const</span> half_length = window_length / 2;</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> </div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span> y = half_length; y &lt; height - half_length; ++y)</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> {</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span> x = half_length; x &lt; width - half_length; ++x)</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> {</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> <span class="keywordtype">float</span> ddxx = 0;</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> <span class="keywordtype">float</span> dxdy = 0;</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> <span class="keywordtype">float</span> ddyy = 0;</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> <span class="keywordflow">for</span> (gil::gray32f_view_t::coord_t y_kernel = 0;</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> y_kernel &lt; window_length;</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> ++y_kernel) {</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="keywordflow">for</span> (gil::gray32f_view_t::coord_t x_kernel = 0;</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> x_kernel &lt; window_length;</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> ++x_kernel) {</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> ddxx += m11(x + x_kernel - half_length, y + y_kernel - half_length)</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> .at(std::integral_constant&lt;int, 0&gt;{}) * weights.at(x_kernel, y_kernel);</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> dxdy += m12_21(x + x_kernel - half_length, y + y_kernel - half_length)</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> .at(std::integral_constant&lt;int, 0&gt;{}) * weights.at(x_kernel, y_kernel);</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> ddyy += m22(x + x_kernel - half_length, y + y_kernel - half_length)</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> .at(std::integral_constant&lt;int, 0&gt;{}) * weights.at(x_kernel, y_kernel);</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> }</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> }</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="keyword">auto</span> det = (ddxx * ddyy) - dxdy * dxdy;</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> <span class="keyword">auto</span> trace = ddxx + ddyy;</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> <span class="keyword">auto</span> harris_value = det - k * trace * trace;</div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> harris_response(x, y).at(std::integral_constant&lt;int, 0&gt;{}) = harris_value;</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> }</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> }</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span>}</div>
</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> </div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span>}} <span class="comment">//namespace boost::gil</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</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>
<div class="ttc" id="agroup___corner_detection_algorithms_html_ga02ddb898d6f546ee25c448c4095f9d94"><div class="ttname"><a href="group___corner_detection_algorithms.html#ga02ddb898d6f546ee25c448c4095f9d94">boost::gil::compute_harris_responses</a></div><div class="ttdeci">void compute_harris_responses(boost::gil::gray32f_view_t m11, boost::gil::gray32f_view_t m12_21, boost::gil::gray32f_view_t m22, boost::gil::detail::kernel_2d&lt; T, Allocator &gt; weights, float k, boost::gil::gray32f_view_t harris_response)</div><div class="ttdoc">function to record Harris responses</div><div class="ttdef"><b>Definition</b> harris.hpp:34</div></div>
<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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