Visual image signal processing apparatus using arithmetic operat

Details Visual image signal processing apparatus using arithmetic operat Visual image signal processing apparatus using arithmetic operat

1996-07-20

1998-09-15

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Gray scale transformation

348689, H04N 518

Patent

active

058086994

ABSTRACT:
A visual image signal processing apparatus includes: an overlaying unit for overlaying a brightness reference signal at a predetermined position in a fly-back period of an input visual image signal; a first clamping unit for clamping an output from the overlaying unit at a predetermined clamping voltage; a detecting unit for applying an output from the first clamping unit to a driving electrode of a cathode ray tube and for detecting a beam current flowing based on the brightness reference signal overlaid in the input visual image signal; and a second clamping unit for controlling the predetermined clamp voltage based on the beam current detected by the detecting unit.

REFERENCES:
patent: 4506292 (1985-03-01), Newton
patent: 4604647 (1986-08-01), Peele
patent: 5504538 (1996-04-01), Tsujihara

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