fh.html

来自「this is code for finding and tracking fe」· HTML 代码 · 共 56 行

<title> </title>

<a href = "../index.html">
<IMG SRC="../home_motif.gif" ALIGN=bottom>
</a>
<a href = "index.html">
<IMG SRC="../toc_motif.gif" ALIGN=bottom>
</a>
<a href = "fl.html">
<IMG SRC="../previous_motif.gif" ALIGN=bottom>
</a>
<a href = "ft.html">
<IMG SRC="../next_motif.gif" ALIGN=bottom>
</a>

<hr>

<h2> KLT_FeatureHistory </h2> 

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

A KLT_FeatureHistory is an array of features.  The <code>nFrames</code> field
indicates the number of features allocated, or rather the number of
frames in which the feature's data is given.
It must not be changed manually.<p>

NOTE: Although a feature list and a feature history look similar, the former
is intended to refer to an array of features from a single image, while
the latter refers to the same feature tracked through several images.<p>

The following code illustrates how to access the data 
in a feature history:

<pre width = 80>
KLT_FeatureHistory fh;
int frame;

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


<hr>