Help for AVERAGE

PURPOSE:
AVERAGE takes up to 48 input images and averages them together to make an
output image

If the size parameter is entered then only that portion of the image
is averaged and the image produced is the size of the SIZE parameter.
That is, if you enter size=(10,10,50,50) then the output will be 
50 lines by 50 samples

Internally, the buffers are of DOUB format so that precision is preserved.

All inputs must be the same format. Multiband images not supported.

EXECUTION:

Example

AVERAGE INP=(A,B,C) OUT=D  will average images A, B, and C to form D.

If the size parameter is used (SIZE=(SL,SS,NL,NS)), only the defined area in
each input image will be used to create the new file.  

PROGRAM LIMITATIONS

     1. The input and output images can be BYTE, HALF, FULL or REAL data.
     2. Maximum number of samples is 20000 per line.  The sum of the number
        of samples per line for the input images must not exceed 120000.
     3. Multi-band images are not supported


WRITTEN BY:                  Steve Pohorsky                1 Jul 1983
COGNIZANT PROGRAMMER:        Ray Bambery    
REVISION:  1                                               5 Oct 1984

    3-94         CRI            MSTP S/W CONVERSION (VICAR PORTING)
    16-May-2011  Ray Bambery - Changed internals to DOUB format
                    Allow BYTE, HALF, FULL, or REAL data for input