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<h3><a href="../index.html"><img alt="Boost GIL" src="../_static/gil.png" border="0"></a></h3>
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<a href="#func-members">Functions</a> </div>
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<div class="title">ImageProcessingMath</div> </div>
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<p>Math operations for IP algorithms.
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<a href="#details">More...</a></p>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
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Functions</h2></td></tr>
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<tr class="memitem:gaaa4583e6d012a8b49ad1738cec762651"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="gaaa4583e6d012a8b49ad1738cec762651"></a>
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double </td><td class="memItemRight" valign="bottom"><a class="el" href="group___image_processing_math.html#gaaa4583e6d012a8b49ad1738cec762651">lanczos</a> (double x, std::ptrdiff_t a)</td></tr>
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<tr class="memdesc:gaaa4583e6d012a8b49ad1738cec762651"><td class="mdescLeft"> </td><td class="mdescRight">Lanczos response at point xLanczos response is defined as: x == 0: 1 -a < x && x < a: 0 otherwise: normalized_sinc(x) / normalized_sinc(x / a) <br /></td></tr>
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<tr class="separator:gaaa4583e6d012a8b49ad1738cec762651"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga5b662d207dd54aba778c0f8c3697c025"><td class="memTemplParams" colspan="2"><a class="anchor" id="ga5b662d207dd54aba778c0f8c3697c025"></a>
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template<typename GradientView , typename OutputView > </td></tr>
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<tr class="memitem:ga5b662d207dd54aba778c0f8c3697c025"><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group___image_processing_math.html#ga5b662d207dd54aba778c0f8c3697c025">compute_hessian_entries</a> (GradientView dx, GradientView dy, OutputView ddxx, OutputView dxdy, OutputView ddyy)</td></tr>
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<tr class="memdesc:ga5b662d207dd54aba778c0f8c3697c025"><td class="mdescLeft"> </td><td class="mdescRight">Compute xy gradient, and second order x and y gradientsHessian matrix is defined as a matrix of partial derivates for 2d case, it is [[ddxx, dxdy], [dxdy, ddyy]. d stands for derivative, and x or y stand for direction. For example, dx stands for derivative (gradient) in horizontal direction, and ddxx means second order derivative in horizon direction <a href="https://en.wikipedia.org/wiki/Hessian_matrix">https://en.wikipedia.org/wiki/Hessian_matrix</a>. <br /></td></tr>
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<tr class="separator:ga5b662d207dd54aba778c0f8c3697c025"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga598481b60bf8ad39a0dce57d65d1820a"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___image_processing_math.html#ga598481b60bf8ad39a0dce57d65d1820a">generate_normalized_mean</a> (boost::gil::gray32f_view_t dst)</td></tr>
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<tr class="memdesc:ga598481b60bf8ad39a0dce57d65d1820a"><td class="mdescLeft"> </td><td class="mdescRight">Generate mean kernelFills supplied view with normalized mean in which all entries will be equal to. <a href="group___image_processing_math.html#ga598481b60bf8ad39a0dce57d65d1820a">More...</a><br /></td></tr>
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<tr class="separator:ga598481b60bf8ad39a0dce57d65d1820a"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gaf09a84c1960713b6a8df3e1d78b1b733"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="gaf09a84c1960713b6a8df3e1d78b1b733"></a>
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void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___image_processing_math.html#gaf09a84c1960713b6a8df3e1d78b1b733">generate_unnormalized_mean</a> (boost::gil::gray32f_view_t dst)</td></tr>
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<tr class="memdesc:gaf09a84c1960713b6a8df3e1d78b1b733"><td class="mdescLeft"> </td><td class="mdescRight">Generate kernel with all 1sFills supplied view with 1s (ones) <br /></td></tr>
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<tr class="separator:gaf09a84c1960713b6a8df3e1d78b1b733"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gae1bd55f00abfa4bad83560e35992f7f4"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="gae1bd55f00abfa4bad83560e35992f7f4"></a>
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void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___image_processing_math.html#gae1bd55f00abfa4bad83560e35992f7f4">generate_gaussian_kernel</a> (boost::gil::gray32f_view_t dst, double sigma)</td></tr>
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<tr class="memdesc:gae1bd55f00abfa4bad83560e35992f7f4"><td class="mdescLeft"> </td><td class="mdescRight">Generate Gaussian kernelFills supplied view with values taken from Gaussian distribution. See <a href="https://en.wikipedia.org/wiki/Gaussian_blur">https://en.wikipedia.org/wiki/Gaussian_blur</a>. <br /></td></tr>
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<tr class="separator:gae1bd55f00abfa4bad83560e35992f7f4"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<p>Math operations for IP algorithms. </p>
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<p>This is mostly handful of mathemtical operations that are required by other image processing algorithms</p>
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<p>Normalized cardinal sine</p>
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<p>normalized_sinc(x) = sin(pi * x) / (pi * x) </p>
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<h2 class="groupheader">Function Documentation</h2>
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<td class="memname">void boost::gil::generate_normalized_mean </td>
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<td>(</td>
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<td class="paramtype">boost::gil::gray32f_view_t </td>
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<td class="paramname"><em>dst</em></td><td>)</td>
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<p>Generate mean kernelFills supplied view with normalized mean in which all entries will be equal to. </p>
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<div class="fragment"><div class="line">1 / (dst.size()) </div></div><!-- fragment -->
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