ft.html

klt, a tracking algorithm

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<h2> KLT_FeatureTable </h2> 

<h2> 
<code>
typedef struct  {<br>
     int nFrames;<br>
     int nFeatures;<br>
     KLT_Feature **feature;<br>
}  *KLT_FeatureTable;<br>
</code>
</h2>

A KLT_FeatureTable is a two-dimensional array of features with
<code>nFrames</code> columns and <code>nFeatures</code> rows.  It is used 
to collect the features tracked through an image sequence.<p>

Data in a feature table is accessed by indexing the feature number before the
frame number.  For example, if <code>ft</code> is a feature table,
the following code prints the data:

<pre width = 80>
KLT_FeatureTable ft;
int feat, frame;

for (feat = 0 ; feat < ft->nFeatures ; feat++)
     for (frame = 0 ; frame < ft->nFrames ; frame++)  {
          printf("(%5.1f,%5.1f) = %d\n", 
               ft->feature[feat][frame]->x,
               ft->feature[feat][frame]->y,
               ft->feature[feat][frame]->val);
     }
</pre>

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