Online Help:

Usage: /vol/vssp/local/trees/amma-4/linux/bin/exMultiScale [options] 
   -optload () [] Load options from a file.  
   -optsave () [] Save options to a file.  
   arg () [] 1st image 
   arg () [] 2nd image 
   -n (3) [3] No. of scales of image hierarchy 
   -N (1) [1] Noise level (in units of grey level) 
   -s (1) [1] PostScript vector rescale factor 
   -S (1) [1] PostScript vector subsample factor 
   -ne (FALSE) [FALSE] Minimal erosion of motion field
   -p () [] Motion parameter file 
   -r (9) [9] Region size for hierarchical l.m.s. fit 
   -nv (FALSE) [FALSE] Turn off verbose o/p
   -help (TRUE) [FALSE] Print usage information. 

Dependancies:
   2 args are compulsory.