Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1986-08-19
1988-08-09
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358206, 250332, 250334, H04N 533, H04N 308
Patent
active
047631929
ABSTRACT:
A twin polygon thermal imager is provided with a compensator for compensating for horizontal distortion in the image produced on a CRT. The distortion compensator applies an amount of correction which is determined, in each horizontal line, to compensate for the particular magnitude of the distortion in that line. The amount of correction needed is determined as a function of the angle between the rotational axis of the polygons and the particular facets thereof producing the particular video line. Compensation is achieved by adjusting the timing and the frequency at which digital video data is read-out from a signal store.
REFERENCES:
patent: 4152725 (1979-05-01), Beckmann
patent: 4347530 (1982-08-01), Stetson
patent: 4358789 (1982-11-01), Confer
patent: 4419692 (1983-12-01), Modisette et al.
patent: 4533164 (1985-11-01), Labb
patent: 4551752 (1985-11-01), Wall et al.
patent: 4644407 (1987-02-01), Nixon
Moore William T.
Robertson Paul J.
Wallace Kenneth J.
Britton Howard W.
Kostak Victor R.
Rank Pullin Controls Limited
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