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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 Olzhas Zhumabek <anonymous.from.applecity@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_HARRIS_HPP</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#define BOOST_GIL_IMAGE_PROCESSING_HARRIS_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 <boost/gil/image_view.hpp></span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <boost/gil/typedefs.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> </div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {</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="l00033"></a><span class="lineno"> 33</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T, <span class="keyword">typename</span> Allocator></div><div class="line"><a name="l00034"></a><span class="lineno"><a class="line" href="group___corner_detection_algorithms.html#gab73f324a539c60eae52a8017feab44d8"> 34</a></span> <span class="keywordtype">void</span> <a class="code" href="group___corner_detection_algorithms.html#gab73f324a539c60eae52a8017feab44d8">compute_harris_responses</a>(</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  boost::gil::gray32f_view_t m11,</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  boost::gil::gray32f_view_t m12_21,</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  boost::gil::gray32f_view_t m22,</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  boost::gil::detail::kernel_2d<T, Allocator> weights,</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordtype">float</span> k,</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  boost::gil::gray32f_view_t harris_response)</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="keywordflow">if</span> (m11.dimensions() != m12_21.dimensions() || m12_21.dimensions() != m22.dimensions()) {</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">throw</span> std::invalid_argument(<span class="stringliteral">"m prefixed arguments must represent"</span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="stringliteral">" tensor from the same image"</span>);</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  }</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keyword">auto</span> <span class="keyword">const</span> window_length = weights.size();</div><div class="line"><a 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 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 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 name="l00051"></a><span class="lineno"> 51</span> </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordflow">for</span> (<span class="keyword">auto</span> y = half_length; y < height - half_length; ++y)</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>  <span class="keywordflow">for</span> (<span class="keyword">auto</span> x = half_length; x < width - half_length; ++x)</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  {</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordtype">float</span> ddxx = 0;</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordtype">float</span> dxdy = 0;</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordtype">float</span> ddyy = 0;</div><div class="line"><a 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 name="l00060"></a><span class="lineno"> 60</span>  y_kernel < window_length;</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  ++y_kernel) {</div><div class="line"><a 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 name="l00063"></a><span class="lineno"> 63</span>  x_kernel < window_length;</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  ++x_kernel) {</div><div class="line"><a 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 name="l00066"></a><span class="lineno"> 66</span>  .at(std::integral_constant<int, 0>{}) * weights.at(x_kernel, y_kernel);</div><div class="line"><a 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 name="l00068"></a><span class="lineno"> 68</span>  .at(std::integral_constant<int, 0>{}) * weights.at(x_kernel, y_kernel);</div><div class="line"><a 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 name="l00070"></a><span class="lineno"> 70</span>  .at(std::integral_constant<int, 0>{}) * weights.at(x_kernel, y_kernel);</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  }</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">auto</span> det = (ddxx * ddyy) - dxdy * dxdy;</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keyword">auto</span> trace = ddxx + ddyy;</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keyword">auto</span> harris_value = det - k * trace * trace;</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  harris_response(x, y).at(std::integral_constant<int, 0>{}) = harris_value;</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>  }</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> }</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> }} <span class="comment">//namespace boost::gil</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="preprocessor">#endif</span></div><div class="ttc" id="group___corner_detection_algorithms_html_gab73f324a539c60eae52a8017feab44d8"><div class="ttname"><a href="group___corner_detection_algorithms.html#gab73f324a539c60eae52a8017feab44d8">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< T, Allocator > weights, float k, boost::gil::gray32f_view_t harris_response)</div><div class="ttdoc">function to record Harris responsesThis algorithm computes Harris responses for structure tensor repr...</div><div class="ttdef"><b>Definition:</b> harris.hpp:34</div></div>
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