Do edge detection on an image.

Online Help:

Usage: /vol/vssp/local/trees/amma-4/linux/bin/doEdgeDet [options] 
   -optload () [] Load options from a file.  
   -optsave () [] Save options to a file.  
   -it () [] Input file type.  
   -ot () [] Output file type.  
   -seq (FALSE) [FALSE] Assume input is a sequence. 
   -v (FALSE) [FALSE] Verbose. 
   -et (0.4) [0.4] Edge threshold. (Not used.)  
   -eh (0.4) [0.4] Hist hi threshold.  
   -el (2.5) [2.5] Hist low threshold.  
   -u (FALSE) [FALSE] Use eight contectivity. 
   -d (FALSE) [FALSE] Output direction, instead of gradient.  
   -s (FALSE) [FALSE] Sort output edges.
   -flip (FALSE) [FALSE] Flip image before and after processing.
   -rei (FALSE) [FALSE] Show raw edge image.
   arg (in.pgm) [in.pgm] Input filename 
   arg (edges.abs) [edges.abs] Output filename 
   -help (TRUE) [FALSE] Print usage information.