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- <div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="preprocessor">#ifndef BOOST_GIL_IMAGE_PROCESSING_HESSIAN_HPP</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="preprocessor">#define BOOST_GIL_IMAGE_PROCESSING_HESSIAN_HPP</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> </div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="preprocessor">#include <boost/gil/image_view.hpp></span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include <boost/gil/typedefs.hpp></span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor">#include <boost/gil/extension/numeric/kernel.hpp></span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include <stdexcept></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="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {</div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">template</span> <<span class="keyword">typename</span> GradientView, <span class="keyword">typename</span> T, <span class="keyword">typename</span> Allocator, <span class="keyword">typename</span> OutputView></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> compute_hessian_responses(</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  GradientView ddxx,</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  GradientView dxdy,</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  GradientView ddyy,</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keyword">const</span> detail::kernel_2d<T, Allocator>& weights,</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  OutputView dst)</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="keywordflow">if</span> (ddxx.dimensions() != ddyy.dimensions()</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  || ddyy.dimensions() != dxdy.dimensions()</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  || dxdy.dimensions() != dst.dimensions()</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  || weights.center_x() != weights.center_y())</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  {</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keywordflow">throw</span> std::invalid_argument(<span class="stringliteral">"dimensions of views are not the same"</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="stringliteral">" or weights don't have equal width and height"</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="stringliteral">" or weights' dimensions are not odd"</span>);</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>  <span class="comment">// Use pixel type of output, as values will be written to output</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keyword">using</span> pixel_t = <span class="keyword">typename</span> std::remove_reference<decltype(std::declval<OutputView>()(0, 0))>::type;</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keyword">using</span> channel_t = <span class="keyword">typename</span> std::remove_reference</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>  decltype(std::declval<pixel_t>().at(std::integral_constant<int, 0>{}))</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  >::type;</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</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>  <span class="keyword">auto</span> center = weights.center_y();</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">for</span> (<span class="keyword">auto</span> y = center; y < dst.height() - center; ++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> (<span class="keyword">auto</span> x = center; x < dst.width() - center; ++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>  <span class="keyword">auto</span> ddxx_i = channel_t();</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keyword">auto</span> ddyy_i = channel_t();</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keyword">auto</span> dxdy_i = channel_t();</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">for</span> (<span class="keyword">typename</span> OutputView::coord_t w_y = 0; w_y < weights.size(); ++w_y)</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="keywordflow">for</span> (<span class="keyword">typename</span> OutputView::coord_t w_x = 0; w_x < weights.size(); ++w_x)</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>  ddxx_i += ddxx(x + w_x - center, y + w_y - center)</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  .at(std::integral_constant<int, 0>{}) * weights.at(w_x, w_y);</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  ddyy_i += ddyy(x + w_x - center, y + w_y - center)</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  .at(std::integral_constant<int, 0>{}) * weights.at(w_x, w_y);</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  dxdy_i += dxdy(x + w_x - center, y + w_y - center)</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  .at(std::integral_constant<int, 0>{}) * weights.at(w_x, w_y);</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  }</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  }</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keyword">auto</span> determinant = ddxx_i * ddyy_i - dxdy_i * dxdy_i;</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  dst(x, y).at(std::integral_constant<int, 0>{}) = determinant;</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  }</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="comment">// namespace boost::gil</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="preprocessor">#endif</span></div></div><!-- fragment --></div><!-- contents -->
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