This should be a "fully" functional program to find silhouettes in a still-camera 
sequence where the background is known.  Example.cpp is an example showing how to 
use the actual function(s) involved.

There are several commandline options to alter the arbitrary defaults given in the 
source code.  Some errors in the commandline will result in use of the defaults 
anyway, so I recommend a batch file.  The one included gives a commandline in which
all the options are used.  They show the default settings for each option, except 
the output path, in which "results\" is specified.

example -option[srebBcCpo]

-s	specify source files
	Include the path (if necessary.)  Rusty's background subtraction works on 
      color images, but the rest of the program assumes greyscale.  The sequence 
      should be in pgm (or ppm...untested) format, uniformly named, and numbered 
      with leading zeros.  Specify location of integers with '#' as in "file####name.ext" 
      for a sequence with 4 digits used in numbering.
      May follow with the first number in the sequence, and the last number.
     -s path\name##.ext
     -s name###abcd.ext 1
     -s path\#### 50 75

-r	specify range
	Enter the first number to access.  Should follow with the final number in the sequence.
	-r 42 256
	-r 5

-e	specify location of edge data
	If CANNY edges are already available, use this option to indicate where, in the 
      same way as the source files (-s).  May follow with the value given edge pixels, 
      and the value given nonedge pixels.
	-e path\###.ext
	-e name##.ext 0
	-e #### 0 255

-b	specify location of background subtraction data
	If background subtraction has already been done, use this option to indicate where 
      it can be found, in the same way as source files (-s).  May follow with the value 
      given foreground pixels, and the value given background pixels.
	-b path\###.ext
	-b name##.ext 255
	-b #### 255 0

-B	perform background subtraction (may save)
	Use this option if background subtraction needs to be done.  Follow with a path 
      and filename as with source files (-s) if you wish the result to be saved in a 
      particular location (using Rusty's code, it will be output to default files if you 
      do not include this information).  May follow with the value to be given foreground 
      pixels, and background pixels.

-c	perform canny edge detection
	May include the high and low threshholds and the sigma value.
	-c 200
	-c 200 100
	-c 200 100 1.0

-C	perform canny edge detection and save
	identical to -c except will also save the information to a default location or as 
      specified by -e.

-p	specify output path
      -p pathname\

-o	specify output filename
      Invoking this option without specifying a filename will prevent output of a final 
      picture for any frame.