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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="preprocessor">#ifndef BOOST_GIL_IMAGE_PROCESSING_HESSIAN_HPP</span></div><div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="preprocessor">#define BOOST_GIL_IMAGE_PROCESSING_HESSIAN_HPP</span></div><div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;</div><div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="preprocessor">#include &lt;boost/gil/image_view.hpp&gt;</span></div><div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="preprocessor">#include &lt;boost/gil/typedefs.hpp&gt;</span></div><div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="preprocessor">#include &lt;boost/gil/extension/numeric/kernel.hpp&gt;</span></div><div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="preprocessor">#include &lt;stdexcept&gt;</span></div><div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;</div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<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>&#160;</div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> GradientView, <span class="keyword">typename</span> T, <span class="keyword">typename</span> Allocator, <span class="keyword">typename</span> OutputView&gt;</div><div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<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>&#160;    GradientView ddxx,</div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;    GradientView dxdy,</div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;    GradientView ddyy,</div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;    <span class="keyword">const</span> detail::kernel_2d&lt;T, Allocator&gt;&amp; weights,</div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;    OutputView dst)</div><div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;{</div><div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;    <span class="keywordflow">if</span> (ddxx.dimensions() != ddyy.dimensions()</div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;        || ddyy.dimensions() != dxdy.dimensions()</div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;        || dxdy.dimensions() != dst.dimensions()</div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;        || weights.center_x() != weights.center_y())</div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;    {</div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;        <span class="keywordflow">throw</span> std::invalid_argument(<span class="stringliteral">&quot;dimensions of views are not the same&quot;</span></div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;            <span class="stringliteral">&quot; or weights don&#39;t have equal width and height&quot;</span></div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;            <span class="stringliteral">&quot; or weights&#39; dimensions are not odd&quot;</span>);</div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;    }</div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;    <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>&#160;    <span class="keyword">using</span> pixel_t = <span class="keyword">typename</span> std::remove_reference&lt;decltype(std::declval&lt;OutputView&gt;()(0, 0))&gt;::type;</div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;</div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;    <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>&#160;        &lt;</div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;            decltype(std::declval&lt;pixel_t&gt;().at(std::integral_constant&lt;int, 0&gt;{}))</div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;        &gt;::type;</div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;</div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;</div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    <span class="keyword">auto</span> center = weights.center_y();</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    <span class="keywordflow">for</span> (<span class="keyword">auto</span> y = center; y &lt; dst.height() - center; ++y)</div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    {</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;        <span class="keywordflow">for</span> (<span class="keyword">auto</span> x = center; x &lt; dst.width() - center; ++x)</div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;        {</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;            <span class="keyword">auto</span> ddxx_i = channel_t();</div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;            <span class="keyword">auto</span> ddyy_i = channel_t();</div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;            <span class="keyword">auto</span> dxdy_i = channel_t();</div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;            <span class="keywordflow">for</span> (<span class="keyword">typename</span> OutputView::coord_t w_y = 0; w_y &lt; weights.size(); ++w_y)</div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;            {</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;                <span class="keywordflow">for</span> (<span class="keyword">typename</span> OutputView::coord_t w_x = 0; w_x &lt; weights.size(); ++w_x)</div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;                {</div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;                    ddxx_i += ddxx(x + w_x - center, y + w_y - center)</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;                        .at(std::integral_constant&lt;int, 0&gt;{}) * weights.at(w_x, w_y);</div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;                    ddyy_i += ddyy(x + w_x - center, y + w_y - center)</div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;                        .at(std::integral_constant&lt;int, 0&gt;{}) * weights.at(w_x, w_y);</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;                    dxdy_i += dxdy(x + w_x - center, y + w_y - center)</div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;                        .at(std::integral_constant&lt;int, 0&gt;{}) * weights.at(w_x, w_y);</div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;                }</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;            }</div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;            <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>&#160;            dst(x, y).at(std::integral_constant&lt;int, 0&gt;{}) = determinant;</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;        }</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;    }</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;}</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;}} <span class="comment">// namespace boost::gil</span></div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;</div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="preprocessor">#endif</span></div></div><!-- fragment --></div><!-- contents -->
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