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#### 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:

v=h/(tan(arcsin(h/m))

A circular patern gives: m*sqrt(2)