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<div id="projectname">NVIDIA 2D Image And Signal Performance Primitives (NPP)
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<a href="#func-members">Functions</a> </div>
<div class="headertitle">
<div class="title">FilterHarrisCornersBorder<div class="ingroups"><a class="el" href="group__image__computer__vision__filtering__functions.html">Computer Vision</a></div></div> </div>
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<p>Performs Harris Corner detection on a single channel 8-bit grayscale image and outputs a single channel 32-bit floating point image consisting the corner response at each pixel of the image.
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:gacc0e7446f50561d69fef013e67cfba0c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__typedefs__npp.html#ga1105a17b5e76381583c46ecd6a60fe21">NppStatus</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__image__filter__harris__corners__border.html#gacc0e7446f50561d69fef013e67cfba0c">nppiFilterHarrisCornersBorderGetBufferSize</a> (<a class="el" href="struct_nppi_size.html">NppiSize</a> oSizeROI, int *hpBufferSize)</td></tr>
<tr class="memdesc:gacc0e7446f50561d69fef013e67cfba0c"><td class="mdescLeft"> </td><td class="mdescRight">Calculate scratch buffer size needed for the FilterHarrisCornersBorder function based on destination image SizeROI width and height. <a href="#gacc0e7446f50561d69fef013e67cfba0c">More...</a><br/></td></tr>
<tr class="separator:gacc0e7446f50561d69fef013e67cfba0c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gacfaba021306cdce94df8f8cbd9cb7ee9"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__typedefs__npp.html#ga1105a17b5e76381583c46ecd6a60fe21">NppStatus</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__image__filter__harris__corners__border.html#gacfaba021306cdce94df8f8cbd9cb7ee9">nppiFilterHarrisCornersBorder_8u32f_C1R_Ctx</a> (const <a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> *pSrc, int nSrcStep, <a class="el" href="struct_nppi_size.html">NppiSize</a> oSrcSize, <a class="el" href="struct_nppi_point.html">NppiPoint</a> oSrcOffset, <a class="el" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> *pDst, int nDstStep, <a class="el" href="struct_nppi_size.html">NppiSize</a> oSizeROI, <a class="el" href="group__typedefs__npp.html#ga0bbcdc12d4e981fb8d0cc1d7e2f4d8c8">NppiDifferentialKernel</a> eFilterType, <a class="el" href="group__typedefs__npp.html#ga4707ef271cf14c74501d894482845771">NppiMaskSize</a> eMaskSize, <a class="el" href="group__typedefs__npp.html#ga4707ef271cf14c74501d894482845771">NppiMaskSize</a> eAvgWindowSize, <a class="el" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nK, <a class="el" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nScale, <a class="el" href="group__typedefs__npp.html#ga7e1448936057e7401acf293d19278317">NppiBorderType</a> eBorderType, <a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> *pDeviceBuffer, <a class="el" href="struct_npp_stream_context.html">NppStreamContext</a> nppStreamCtx)</td></tr>
<tr class="memdesc:gacfaba021306cdce94df8f8cbd9cb7ee9"><td class="mdescLeft"> </td><td class="mdescRight">1 channel 8-bit unsigned grayscale to 1 channel 32-bit floating point Harris corners response image with border control. <a href="#gacfaba021306cdce94df8f8cbd9cb7ee9">More...</a><br/></td></tr>
<tr class="separator:gacfaba021306cdce94df8f8cbd9cb7ee9"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga0267f9a233b615419623ce6257851c98"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__typedefs__npp.html#ga1105a17b5e76381583c46ecd6a60fe21">NppStatus</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__image__filter__harris__corners__border.html#ga0267f9a233b615419623ce6257851c98">nppiFilterHarrisCornersBorder_8u32f_C1R</a> (const <a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> *pSrc, int nSrcStep, <a class="el" href="struct_nppi_size.html">NppiSize</a> oSrcSize, <a class="el" href="struct_nppi_point.html">NppiPoint</a> oSrcOffset, <a class="el" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> *pDst, int nDstStep, <a class="el" href="struct_nppi_size.html">NppiSize</a> oSizeROI, <a class="el" href="group__typedefs__npp.html#ga0bbcdc12d4e981fb8d0cc1d7e2f4d8c8">NppiDifferentialKernel</a> eFilterType, <a class="el" href="group__typedefs__npp.html#ga4707ef271cf14c74501d894482845771">NppiMaskSize</a> eMaskSize, <a class="el" href="group__typedefs__npp.html#ga4707ef271cf14c74501d894482845771">NppiMaskSize</a> eAvgWindowSize, <a class="el" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nK, <a class="el" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nScale, <a class="el" href="group__typedefs__npp.html#ga7e1448936057e7401acf293d19278317">NppiBorderType</a> eBorderType, <a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> *pDeviceBuffer)</td></tr>
<tr class="separator:ga0267f9a233b615419623ce6257851c98"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>Performs Harris Corner detection on a single channel 8-bit grayscale image and outputs a single channel 32-bit floating point image consisting the corner response at each pixel of the image. </p>
<p>The algorithm consists of two phases. The first phase generates the floating point product of XX, YY, and XY gradients at each pixel in the image. The type of gradient used is controlled by the eFilterType and eMaskSize parameters. The second phase averages those products over a window of either 3x3 or 5x5 pixels around the center pixel then generates the Harris corner response at that pixel which is output in the destination image. The Harris response value is determined as H = ((XX * YY - XY * XY) - (nK * ((XX + YY) * (XX + YY)))) * nScale.</p>
<p>Currently only the NPP_BORDER_REPLICATE border type operation is supported. Borderless output can be accomplished by using a larger source image than the destination and adjusting oSrcSize and oSrcOffset parameters accordingly. </p>
<h2 class="groupheader">Function Documentation</h2>
<a class="anchor" id="ga0267f9a233b615419623ce6257851c98"></a>
<div class="memitem">
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<table class="memname">
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<td class="memname"><a class="el" href="group__typedefs__npp.html#ga1105a17b5e76381583c46ecd6a60fe21">NppStatus</a> nppiFilterHarrisCornersBorder_8u32f_C1R </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> * </td>
<td class="paramname"><em>pSrc</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>nSrcStep</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="struct_nppi_size.html">NppiSize</a> </td>
<td class="paramname"><em>oSrcSize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="struct_nppi_point.html">NppiPoint</a> </td>
<td class="paramname"><em>oSrcOffset</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> * </td>
<td class="paramname"><em>pDst</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>nDstStep</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="struct_nppi_size.html">NppiSize</a> </td>
<td class="paramname"><em>oSizeROI</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__typedefs__npp.html#ga0bbcdc12d4e981fb8d0cc1d7e2f4d8c8">NppiDifferentialKernel</a> </td>
<td class="paramname"><em>eFilterType</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__typedefs__npp.html#ga4707ef271cf14c74501d894482845771">NppiMaskSize</a> </td>
<td class="paramname"><em>eMaskSize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__typedefs__npp.html#ga4707ef271cf14c74501d894482845771">NppiMaskSize</a> </td>
<td class="paramname"><em>eAvgWindowSize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> </td>
<td class="paramname"><em>nK</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> </td>
<td class="paramname"><em>nScale</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__typedefs__npp.html#ga7e1448936057e7401acf293d19278317">NppiBorderType</a> </td>
<td class="paramname"><em>eBorderType</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> * </td>
<td class="paramname"><em>pDeviceBuffer</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
</div>
</div>
<a class="anchor" id="gacfaba021306cdce94df8f8cbd9cb7ee9"></a>
<div class="memitem">
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<table class="memname">
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<td class="memname"><a class="el" href="group__typedefs__npp.html#ga1105a17b5e76381583c46ecd6a60fe21">NppStatus</a> nppiFilterHarrisCornersBorder_8u32f_C1R_Ctx </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> * </td>
<td class="paramname"><em>pSrc</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>nSrcStep</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="struct_nppi_size.html">NppiSize</a> </td>
<td class="paramname"><em>oSrcSize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="struct_nppi_point.html">NppiPoint</a> </td>
<td class="paramname"><em>oSrcOffset</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> * </td>
<td class="paramname"><em>pDst</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>nDstStep</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="struct_nppi_size.html">NppiSize</a> </td>
<td class="paramname"><em>oSizeROI</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__typedefs__npp.html#ga0bbcdc12d4e981fb8d0cc1d7e2f4d8c8">NppiDifferentialKernel</a> </td>
<td class="paramname"><em>eFilterType</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__typedefs__npp.html#ga4707ef271cf14c74501d894482845771">NppiMaskSize</a> </td>
<td class="paramname"><em>eMaskSize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__typedefs__npp.html#ga4707ef271cf14c74501d894482845771">NppiMaskSize</a> </td>
<td class="paramname"><em>eAvgWindowSize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> </td>
<td class="paramname"><em>nK</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> </td>
<td class="paramname"><em>nScale</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__typedefs__npp.html#ga7e1448936057e7401acf293d19278317">NppiBorderType</a> </td>
<td class="paramname"><em>eBorderType</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> * </td>
<td class="paramname"><em>pDeviceBuffer</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="struct_npp_stream_context.html">NppStreamContext</a> </td>
<td class="paramname"><em>nppStreamCtx</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
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</div><div class="memdoc">
<p>1 channel 8-bit unsigned grayscale to 1 channel 32-bit floating point Harris corners response image with border control. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">pSrc</td><td><a class="el" href="nppi_conventions_lb.html#source_image_pointer">Source-Image Pointer</a>. </td></tr>
<tr><td class="paramname">nSrcStep</td><td><a class="el" href="nppi_conventions_lb.html#source_image_line_step">Source-Image Line Step</a>. </td></tr>
<tr><td class="paramname">oSrcSize</td><td>Source image width and height in pixels relative to pSrc. </td></tr>
<tr><td class="paramname">oSrcOffset</td><td>The pixel offset that pSrc points to relative to the origin of the source image. </td></tr>
<tr><td class="paramname">pDst</td><td>output edge destination_image_pointer. </td></tr>
<tr><td class="paramname">nDstStep</td><td>output edge destination_image_line_step. </td></tr>
<tr><td class="paramname">oSizeROI</td><td><a class="el" href="nppi_conventions_lb.html#roi_specification">Region-of-Interest (ROI)</a>. </td></tr>
<tr><td class="paramname">eFilterType</td><td>selects between Sobel or Scharr filter type. </td></tr>
<tr><td class="paramname">eMaskSize</td><td>fixed filter mask size to use (3x3 or 5x5 for Sobel). </td></tr>
<tr><td class="paramname">eAvgWindowSize</td><td>fixed window mask size to use (3x3 or 5x5). </td></tr>
<tr><td class="paramname">nK</td><td>Harris Corners constant (commonly used value is 0.04F). </td></tr>
<tr><td class="paramname">nScale</td><td>output is scaled by this scale factor. </td></tr>
<tr><td class="paramname">eBorderType</td><td>source image border type to use use. </td></tr>
<tr><td class="paramname">pDeviceBuffer</td><td>pointer to scratch DEVICE memory buffer of size hpBufferSize (see <a class="el" href="group__image__filter__harris__corners__border.html#gacc0e7446f50561d69fef013e67cfba0c" title="Calculate scratch buffer size needed for the FilterHarrisCornersBorder function based on destination ...">nppiFilterHarrisCornersBorderGetBufferSize()</a> above) </td></tr>
<tr><td class="paramname">nppStreamCtx</td><td><a class="el" href="index.html#application_managed_stream_context">Application Managed Stream Context</a>. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><a class="el" href="nppi_conventions_lb.html#image_data_error_codes">Image Data Related Error Codes</a>, <a class="el" href="nppi_conventions_lb.html#roi_error_codes">ROI Related Error Codes</a> </dd></dl>
</div>
</div>
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<td class="memname"><a class="el" href="group__typedefs__npp.html#ga1105a17b5e76381583c46ecd6a60fe21">NppStatus</a> nppiFilterHarrisCornersBorderGetBufferSize </td>
<td>(</td>
<td class="paramtype"><a class="el" href="struct_nppi_size.html">NppiSize</a> </td>
<td class="paramname"><em>oSizeROI</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int * </td>
<td class="paramname"><em>hpBufferSize</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Calculate scratch buffer size needed for the FilterHarrisCornersBorder function based on destination image SizeROI width and height. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">oSizeROI</td><td><a class="el" href="nppi_conventions_lb.html#roi_specification">Region-of-Interest (ROI)</a>. </td></tr>
<tr><td class="paramname">hpBufferSize</td><td>Required buffer size. Important: hpBufferSize is a <em>host pointer.</em> <a class="el" href="general_conventions_lb.html#general_scratch_buffer">Scratch Buffer and Host Pointer</a>. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><a class="el" href="nppi_conventions_lb.html#image_data_error_codes">Image Data Related Error Codes</a>, <a class="el" href="nppi_conventions_lb.html#roi_error_codes">ROI Related Error Codes</a> </dd></dl>
</div>
</div>
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