Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1980-09-30
1982-02-16
Martin, John C.
Facsimile and static presentation processing
Static presentation processing
Attribute control
315368, H04N 962
Patent
active
043162118
ABSTRACT:
A convergence measuring apparatus for use with a color television kinescope and deflection yoke comprises means for activating two of the electron beams of the kinescope to generate a convergence test pattern on the kinescope display screen. The convergence test pattern is a set of alternating color patches. The degree of overlap and gap between patches is indicative of the degree of beam misconvergence. A monochrome television camera observes the test pattern and provides a signal to a signal processor which controls the electron beam activating means to move one color patch with respect to the other color to reduce the gap and overlap between patches. A measurement of the amount of patch movement necessary to minimize the overlap and gap between patches is an indication of electron beam misconvergence in the vicinity of the test pattern.
REFERENCES:
patent: 3623816 (1971-11-01), Slavik
patent: 3723801 (1973-03-01), Oxenham
patent: 4035834 (1977-07-01), Drury
patent: 4163308 (1979-08-01), Tawa et al.
patent: 4193086 (1980-03-01), Kawaguchi
Fox Ernest D.
Mackey Donald
Martin John C.
Rasmussen P. J.
RCA Corporation
Stevens S. J.
Whitacre E. M.
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