Help for ACCCK

PURPOSE
    
Generates a grid over the intersection of data in the two input images.
Then correlates on the grid points using picmtch5.  The non-correlating
points are thrown out.  Then the best 90% of points are selected, the
offsets (not the residuals) are root-mean-squared to give an accuracy
measure in pixels.  If a plot file name is given, a plot of the offsets
will placed in that file.  The plot is an image and can be viewed with
xvd.

Use the smaller of the two images for input 1.  Otherwise the plot will
have huge blank areas.
   
CALL

  accck apr03.img dec02.img outfile=xxxplot
  
OPERATION

Generates a grid over the intersection of data in the two input images.
Then correlates on the grid points using picmtch5.  The non-correlating
points are thrown out.  Then the best 90% of points are selected, the
offsets (not the residuals) are root-mean-squared to give an accuracy
measure in pixels.  If a plot file name is given, a plot of the offsets
will placed in that file.  The plot is an image and can be viewed with
xvd.

PERFORMANCE

Restrictions
------------

Use the smaller of the two images for input 1.  Otherwise the plot will
have huge blank areas.

Original Programmer: A. L. Zobrist, 25 Feb, 2004
Current Cognizant Programmer: A. L. Zobrist
Last change by: Mike Smyth,  30 Aug, 2016