Help for MINFILT

PURPOSE:
Selects the minimum DN within a rectangular convolution window for
images in BYTE, HALF, FULL or REAL formats.

EXECUTION:

MINFILT may be executed in the following manner:

		MINFILT INP=A OUT=B SIZE=(SL,SS,NL,NS) PARAMS

where INP, OUT, SIZE, AND PARAMS are parameters and are explained in their
respective parameter section.

OPERATION:

MINFILT finds the local minimum value of a rectangular window centered at
each pixel in an image. 
The program takes advantage of the fact that if the minimum of an area
was not in the left column then the next area to the right (one 
pixel over) need only be checked in the right column.

EXAMPLE:

	 MINFILT INP=A OUT=B NLW=5 NSW=7
  The window is 5 lines by 7 samples.

HISTORY:

ORIGINALLY WRITTEN BY: J Lorre 1/30/93
COGNIZANT PROGRAMMER:  Ray Bambery

    May 18, 2011 - Ray Bambery - Mods for gcc4.4.4 64-bit and
                    add FULL and REAL data types, changed 
                    confusing NL & NS parms to ONL and ONS since
                    they refer to output file

    09-Jan-2013 -lwk- ONL and ONS commented out, since the code does
                      not use them.  (NL,NS are supposed to be alternatives
                      to the SIZE parameter.)

PARAMETERS: