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<title>Description of descpatch_GRAD</title>
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<meta name="description" content="Patch descriptor based on histogrammed gradient [Lowe's SIFT descriptor].">
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<h1>descpatch_GRAD
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<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="box"><strong>Patch descriptor based on histogrammed gradient [Lowe's SIFT descriptor].</strong></div>
<h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="box"><strong>function desc = descpatch_GRAD( I, sigmas, ch2params ) </strong></div>
<h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="fragment"><pre class="comment"> Patch descriptor based on histogrammed gradient [Lowe's SIFT descriptor].
Descriptor for an image that is fairly robust to small perturbations of the
image.
INPUTS
I - MxN double image with most vals in range [-1,1]
sigmas - vector of sigmas, scales at which to look at gradient
ch2params - see imagedesc_ch2desc
OUTPUTS
desc - 1xp feature vector
See also <a href="imagedesc.html" class="code" title="function desc = imagedesc( I, imdesc, show )">IMAGEDESC</a>, <a href="descpatch_FB.html" class="code" title="function desc = descpatch_FB( I, FB, ch2params )">DESCPATCH_FB</a>, <a href="imagedesc_ch2desc.html" class="code" title="function desc = imagedesc_ch2desc( CHS, ch2params, iscuboid, nch, ninst )">IMAGEDESC_CH2DESC</a></pre></div>
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<h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
This function calls:
<ul style="list-style-image:url(../matlabicon.gif)">
<li><a href="imagedesc_ch2desc.html" class="code" title="function desc = imagedesc_ch2desc( CHS, ch2params, iscuboid, nch, ninst )">imagedesc_ch2desc</a> Helper, converts descriptor in array format to vector or histogram.</li></ul>
This function is called by:
<ul style="list-style-image:url(../matlabicon.gif)">
<li><a href="imagedesc_generate.html" class="code" title="function imdesc = imagedesc_generate( iscuboid, str_desc, histFLAG, jitterFLAG )">imagedesc_generate</a> Generate parameters for image or cuboid descriptor.</li></ul>
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<hr><address>Generated on Tue 11-Oct-2005 20:31:02 by <strong><a href="http://www.artefact.tk/software/matlab/m2html/" target="_parent">m2html</a></strong> © 2005</address>
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