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subshiftc, im1, im2, xoff, yoff [,
apod]
Determines the sub-pixel shift between two two-dimensional images
im1 and im2 and returns the found shift
(measured in pixels) in xoff and yoff. If
apod is specified, then apodization is applied to the
compared images. The merit value (i.e., the measure of goodness) is
returned in global variable !meritc. This routine favors
algorithm symmetry over execution speed; i.e., the results for a
positive shift are nearly equal to the results for the corresponding
negative shift.