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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"><title>SIFT: imgfeatures.h File Reference</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.5.2 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="annotated.html"><span>Data Structures</span></a></li> <li class="current"><a href="files.html"><span>Files</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="files.html"><span>File List</span></a></li> <li><a href="globals.html"><span>Globals</span></a></li> </ul></div><h1>imgfeatures.h File Reference</h1><hr><a name="_details"></a><h2>Detailed Description</h2>Functions and structures for dealing with image features. <p>Copyright (C) 2006-2007 Rob Hess <<a href="mailto:hess@eecs.oregonstate.edu">hess@eecs.oregonstate.edu</a>><p><dl class="version" compact><dt><b>Version:</b></dt><dd>1.1.1-20070913 </dd></dl><p><code>#include "cxcore.h"</code><br><table border="0" cellpadding="0" cellspacing="0"><tr><td></td></tr><tr><td colspan="2"><br><h2>Data Structures</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">struct </td><td class="memItemRight" valign="bottom"><a class="el" href="structfeature.html">feature</a></td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Structure to represent an affine invariant image <a class="el" href="structfeature.html" title="Structure to represent an affine invariant image feature.">feature</a>. <a href="structfeature.html#_details">More...</a><br></td></tr><tr><td colspan="2"><br><h2>Defines</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="fe7cd39c02f9b76ef87b9a27aab8826d"></a><!-- doxytag: member="imgfeatures.h::FEATURE_MAX_D" ref="fe7cd39c02f9b76ef87b9a27aab8826d" args="" -->#define </td><td class="memItemRight" valign="bottom"><a class="el" href="imgfeatures_8h.html#fe7cd39c02f9b76ef87b9a27aab8826d">FEATURE_MAX_D</a> 128</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">max <a class="el" href="structfeature.html" title="Structure to represent an affine invariant image feature.">feature</a> descriptor length <br></td></tr><tr><td colspan="2"><br><h2>Enumerations</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><a class="el" href="imgfeatures_8h.html#b81a05673a4361b6af7829772fe8f10c">feature_type</a> </td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">FEATURE_OXFD <br> FEATURE_LOWE. <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><a class="el" href="imgfeatures_8h.html#1248feeb561a9e5d9d2b643c7d8a8330">feature_match_type</a> </td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">FEATURE_FWD_MATCH <br> FEATURE_BCK_MATCH <br> FEATURE_MDL_MATCH. <br></td></tr><tr><td colspan="2"><br><h2>Functions</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="imgfeatures_8h.html#0edfb41422bbfa7b4c5421784641420b">import_features</a> (char *filename, int type, struct <a class="el" href="structfeature.html">feature</a> **feat)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Reads image features from file. <a href="#0edfb41422bbfa7b4c5421784641420b"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="imgfeatures_8h.html#35c5a2f766b0dec41d6baff7a0463bf5">export_features</a> (char *filename, struct <a class="el" href="structfeature.html">feature</a> *feat, int n)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Exports a <a class="el" href="structfeature.html" title="Structure to represent an affine invariant image feature.">feature</a> set to a file formatted depending on the type of features, as specified in the <a class="el" href="structfeature.html" title="Structure to represent an affine invariant image feature.">feature</a> struct's type field. <a href="#35c5a2f766b0dec41d6baff7a0463bf5"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="imgfeatures_8h.html#77ce47047ad108c6deea29f50ae926d1">draw_features</a> (IplImage *img, struct <a class="el" href="structfeature.html">feature</a> *feat, int n)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Displays a set of features on an image. <a href="#77ce47047ad108c6deea29f50ae926d1"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="imgfeatures_8h.html#d2d260809861abae26c9e6a371b63fb2">descr_dist_sq</a> (struct <a class="el" href="structfeature.html">feature</a> *f1, struct <a class="el" href="structfeature.html">feature</a> *f2)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Calculates the squared Euclidian distance between two <a class="el" href="structfeature.html" title="Structure to represent an affine invariant image feature.">feature</a> descriptors. <a href="#d2d260809861abae26c9e6a371b63fb2"></a><br></td></tr></table><hr><h2>Function Documentation</h2><a class="anchor" name="0edfb41422bbfa7b4c5421784641420b"></a><!-- doxytag: member="imgfeatures.h::import_features" ref="0edfb41422bbfa7b4c5421784641420b" args="(char *filename, int type, struct feature **feat)" --><div class="memitem"><div class="memproto"> <table class="memname"> <tr> <td class="memname">int import_features </td> <td>(</td> <td class="paramtype">char * </td> <td class="paramname"> <em>filename</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </td> <td class="paramname"> <em>type</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">struct <a class="el" href="structfeature.html">feature</a> ** </td> <td class="paramname"> <em>feat</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td width="100%"></td> </tr> </table></div><div class="memdoc"><p>Reads image features from file. <p>The file should be formatted either as from the code provided by the Visual Geometry Group at Oxford or from the code provided by David Lowe.<p><dl compact><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>filename</em> </td><td>location of a file containing image features </td></tr> <tr><td valign="top"></td><td valign="top"><em>type</em> </td><td>determines how features are input. If <em>type</em> is FEATURE_OXFD, the input file is treated as if it is from the code provided by the VGG at Oxford: <a href="http://www.robots.ox.ac.uk:5000/~vgg/research/affine/index.html">http://www.robots.ox.ac.uk:5000/~vgg/research/affine/index.html</a> <br><br> If <em>type</em> is FEATURE_LOWE, the input file is treated as if it is from David Lowe's SIFT code: <a href="http://www.cs.ubc.ca/~lowe/keypoints">http://www.cs.ubc.ca/~lowe/keypoints</a> </td></tr> <tr><td valign="top"></td><td valign="top"><em>feat</em> </td><td>pointer to an array in which to store imported features</td></tr> </table></dl><dl class="return" compact><dt><b>Returns:</b></dt><dd>Returns the number of features imported from filename or -1 on error </dd></dl></div></div><p><a class="anchor" name="35c5a2f766b0dec41d6baff7a0463bf5"></a><!-- doxytag: member="imgfeatures.h::export_features" ref="35c5a2f766b0dec41d6baff7a0463bf5" args="(char *filename, struct feature *feat, int n)" --><div class="memitem"><div class="memproto"> <table class="memname"> <tr> <td class="memname">int export_features </td> <td>(</td> <td class="paramtype">char * </td> <td class="paramname"> <em>filename</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">struct <a class="el" href="structfeature.html">feature</a> * </td> <td class="paramname"> <em>feat</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </td> <td class="paramname"> <em>n</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td width="100%"></td> </tr> </table></div><div class="memdoc"><p>Exports a <a class="el" href="structfeature.html" title="Structure to represent an affine invariant image feature.">feature</a> set to a file formatted depending on the type of features, as specified in the <a class="el" href="structfeature.html" title="Structure to represent an affine invariant image feature.">feature</a> struct's type field. <p><dl compact><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>filename</em> </td><td>name of file to which to export features </td></tr> <tr><td valign="top"></td><td valign="top"><em>feat</em> </td><td><a class="el" href="structfeature.html" title="Structure to represent an affine invariant image feature.">feature</a> array </td></tr> <tr><td valign="top"></td><td valign="top"><em>n</em> </td><td>number of features</td></tr> </table></dl><dl class="return" compact><dt><b>Returns:</b></dt><dd>Returns 0 on success or 1 on error </dd></dl></div></div><p><a class="anchor" name="77ce47047ad108c6deea29f50ae926d1"></a><!-- doxytag: member="imgfeatures.h::draw_features" ref="77ce47047ad108c6deea29f50ae926d1" args="(IplImage *img, struct feature *feat, int n)" --><div class="memitem"><div class="memproto"> <table class="memname"> <tr> <td class="memname">void draw_features </td> <td>(</td> <td class="paramtype">IplImage * </td> <td class="paramname"> <em>img</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">struct <a class="el" href="structfeature.html">feature</a> * </td> <td class="paramname"> <em>feat</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </td> <td class="paramname"> <em>n</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td width="100%"></td> </tr> </table></div><div class="memdoc"><p>Displays a set of features on an image. <p><dl compact><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>img</em> </td><td>image on which to display features </td></tr> <tr><td valign="top"></td><td valign="top"><em>feat</em> </td><td>array of Oxford-type features </td></tr> <tr><td valign="top"></td><td valign="top"><em>n</em> </td><td>number of features </td></tr> </table></dl></div></div><p><a class="anchor" name="d2d260809861abae26c9e6a371b63fb2"></a><!-- doxytag: member="imgfeatures.h::descr_dist_sq" ref="d2d260809861abae26c9e6a371b63fb2" args="(struct feature *f1, struct feature *f2)" --><div class="memitem"><div class="memproto"> <table class="memname"> <tr> <td class="memname">double descr_dist_sq </td> <td>(</td> <td class="paramtype">struct <a class="el" href="structfeature.html">feature</a> * </td> <td class="paramname"> <em>f1</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">struct <a class="el" href="structfeature.html">feature</a> * </td> <td class="paramname"> <em>f2</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td width="100%"></td> </tr> </table></div><div class="memdoc"><p>Calculates the squared Euclidian distance between two <a class="el" href="structfeature.html" title="Structure to represent an affine invariant image feature.">feature</a> descriptors. <p><dl compact><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>f1</em> </td><td>first <a class="el" href="structfeature.html" title="Structure to represent an affine invariant image feature.">feature</a> </td></tr> <tr><td valign="top"></td><td valign="top"><em>f2</em> </td><td>second <a class="el" href="structfeature.html" title="Structure to represent an affine invariant image feature.">feature</a></td></tr> </table></dl><dl class="return" compact><dt><b>Returns:</b></dt><dd>Returns the squared Euclidian distance between the descriptors of <em>f1</em> and <em>f2</em>. </dd></dl></div></div><p><hr size="1"><address style="text-align: right;"><small>Generated on Tue Oct 30 11:37:27 2007 for SIFT by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.2 </small></address></body></html>⌨️ 快捷键说明
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