User name Pascal VERNIN
Log entry time 16:18:13 on October 23,1998
Entry number 3317
keyword=Circular Raster Scanner width
How to compute the H and V diameter of the raster from ARC scanners?
In case of elliptical raster (uncorrelated ellipse in the HxV plane),
let "h" be the H diameter, "v" the vertical one.
h is measured directly by the width of the horizontal profile (right peak,
produced by the vertical wire)
The wire at +45deg. measure a width "m1" (left peak)
The wire at -45deg. measure a width "m2" (center peak)
-if the ellipse is uncorrelated, one must measure m1=m2 (=m)
-then v is given by:
A circular patern gives: m*sqrt(2)