lab@qubix.UUCP (07/15/83)
I am working with a digitizing device to be used on a CRT screen.
The routine which reads the digitizer does a simple linear correction so
that when I touch the center of the screeen, the system returns x and y
corresponding to the center of the screen.
Because of the curvature of the screen, the bezel surrounding it, and not-
unexpected properties of the digitizer, when I move away from the center of
the screen, the distortion between the actual digitizer position and the
values the system reads increases.
Can anyone provide or point me to an algorithm capable of giving reasonable
correction to this distortion suitable for use in the OS? I.e., the
correction need not be perfect as long as it is continuous and close enough
for human work (within a radius of 1/8" or 1/16" @ 144 points/inch, the
smaller the better), and speed on the 68K UN*X is appreciated.
Thanks in advance,
Larry Bickford,
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