 Finding facilities are provided by <TT>"vision/edge/edge"</TT>.

<P>

 <BR>
<BR> <A NAME="39892"></A>
<PRE><TT>
<B>edge1</B> <I>img &amp;optional (method 1) [function]
<BR>(th1 *edge-intensity-threshold*)      (th2 *weak-edge-threshold*) 
<BR>(run *edge-length-threshold*)      result
<BR>&amp;aux (width (send img :width)) (height (send img :height))</I>
</TT></PRE>

<DL COMPACT>
<DT> 
<DD>finds edge pixels in this image.
<B>edge1</B> first applies a gradient operator to every pixel.
There are three kinds o