📄 stfeatures.html
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<title>Description of stfeatures</title>
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<h1>stfeatures
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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>Interface to spatio-temporal feature detectors.</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 [R,subs,vals,cuboids,V] = stfeatures( I, sigma, tau, periodic, thresh, maxn,overlap_r, shr_spt, shr_tmp, show ) </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"> Interface to spatio-temporal feature detectors.
Wrapper for stfeatures detectors that first shrinks I and then resizes outputs
appropriately. It also applies nonmaximal supression and finds local maxima of detector
output.
INPUTS
I - 3D uint (or double) array - input video
sigma - spatial scale
tau - temporal scale
periodic - if 1 uses periodic detector else uses harris detector
thresh - [optional] abolute threshold for features strength
maxn - [optional] maximum number of featrues (alternative to thresh)
overlap_r - [optional] controls amount of overlap between cuboids, range: [0,2)
(0 -> no overlap, 2 -> minimal restriction on overlap; 1.7 -> default )
show - [optional] figure to use for display (no display if == 0)
shr_spt - [optional] spatial shrink factor. Must be integer>1
tau_spt - [optional] temporal shrink factor. Must be integer>1
OUTPUTS
R - detector strength response at each image location
subs - detected features locations
vals - relative feature strengths
cuboids - the detected cuboids (size depends on sigma/tau)
V - location of responses visualization
EXAMPLE
load example;
[R,subs,vals,cuboids,V] = stfeatures( I, 2, 3, 1, 2e-4, [], 1.85, 2, 1, 1 );
[R,subs,vals,cuboids,V] = stfeatures( I, 2, 3, 0, eps, [], 1.85, 2, 1, 5 );
See also <a href="stfeatures_harris.html" class="code" title="function H = stfeatures_harris( I, sigma, tau )">STFEATURES_HARRIS</a>, <a href="stfeatures_periodic.html" class="code" title="function Lquad = stfeatures_periodic( I, sigma, tau )">STFEATURES_PERIODIC</a>, NONMAXSUPR_WINDOW</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="cuboid_display.html" class="code" title="function [ V, Imasked ] = cuboid_display( I, cuboids_rs, subs, show )">cuboid_display</a> Fancy cuboid visualization.</li><li><a href="cuboid_extract.html" class="code" title="function [ cuboids, cuboid_starts, cuboid_ends, subs ] =cuboid_extract( I, cuboids_rs, subs, extractflag )">cuboid_extract</a> Extracts cuboids of given size from the array I at specified locations.</li><li><a href="stfeatures_harris.html" class="code" title="function H = stfeatures_harris( I, sigma, tau )">stfeatures_harris</a> Laptev & Lindeberg spatiotemporal feature detector - interface through stfeatures.</li><li><a href="stfeatures_periodic.html" class="code" title="function Lquad = stfeatures_periodic( I, sigma, tau )">stfeatures_periodic</a> Piotr's spatiotemporal feature detector - interface through stfeatures.</li></ul>
This function is called by:
<ul style="list-style-image:url(../matlabicon.gif)">
<li><a href="../recognition/featuresLGdetect.html" class="code" title="function featuresLGdetect( nsets, cliptypes, par_stfeatures )">featuresLGdetect</a> Detects features for each set of cuboids using stfeatures.</li><li><a href="../recognition/featuresSMdetect.html" class="code" title="function DATASETS = featuresSMdetect( DATASETS, par_stfeatures )">featuresSMdetect</a> Detects features for each set of cuboids using stfeatures.</li><li><a href="stfeatures_allscales.html" class="code" title="function [RS,subs_cell,vals_cell] =stfeatures_allscales( I, sigmas, taus, stfeatures_params, moviename )">stfeatures_allscales</a> Apply spatio-temporal feature detector at a number of scales.</li><li><a href="stfeatures_demo.html" class="code" title="function stfeatures_demo( periodic )">stfeatures_demo</a> Demo of stfeatures on the "oscillating example".</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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