Automatic calibration circuit for monitoring device

Details Automatic calibration circuit for monitoring device Automatic calibration circuit for monitoring device

1986-01-28

1987-11-17

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358168, 358169, 358 93, 358111, H04N 1700

Patent

active

047077395

ABSTRACT:
An automatic calibration circuit for a monitoring device in which a static image, such as may be derived from an X-ray camera or an ultrasonic imaging device, is displayed as a static image on CRT and the image projected and recorded on film. A uniform pattern is displayed on the CRT by setting a contrast control signal to a minimum value and a brightness control signal to a reference level. Then, the light outputted from the face of the CRT is measured at any arbitrary point on the face of the CRT. The value so measured is used to correct the brightness signal and contrast signal so as to maintain initially set brightness and contrast values for images displayed on the CRT.

REFERENCES:
patent: 3830970 (1974-08-01), Hurley et al.
patent: 3886305 (1975-05-01), Yew et al.
patent: 3996420 (1976-12-01), Geluk
patent: 4013833 (1977-03-01), Zimmerman
patent: 4530011 (1985-07-01), Haddick
patent: 4584610 (1986-04-01), Mizokami et al.

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