Purity detection apparatus for color picture tubes

Details Purity detection apparatus for color picture tubes Purity detection apparatus for color picture tubes

1978-01-26

1981-03-03

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 962

Patent

active

042544327

ABSTRACT:
A raster, for example in magenta, generated on a phosphor screen of a color picture tube is picked up by a television camera through an optical filter which allows a magenta component to pass therethrough predominantly. The television camera scans the displayed raster in the horizontal direction on the line base thereby to produce a video signal representing luminances at individual points on the raster lines. A sample and hold circuit is provided to extract paired video signal values at paired points on the raster lines located symmetrically to each other relative to a vertical center line of the display screen. One of the paired video signal values extracted through the timed sampling operation is subtracted from the other at a processing circuit.

REFERENCES:
patent: 3723801 (1973-03-01), Oxentiam
patent: 3737716 (1973-06-01), Gerntsen
patent: 3748526 (1973-07-01), Wedam
patent: 3916437 (1975-10-01), Barbin
patent: 4001877 (1977-01-01), Simpson
patent: 4035834 (1977-07-01), Drury
patent: 4095137 (1978-06-01), Oswald
patent: 4159484 (1979-06-01), Strathman

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