Method and apparatus for automatically adjusting the focus of ca

Details Method and apparatus for automatically adjusting the focus of ca Method and apparatus for automatically adjusting the focus of ca

1989-03-06

1990-09-11

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358218, 358 10, H01J 2958

Patent

active

049556800

ABSTRACT:
Method and apparatus for automatically adjusting the focus of cathode ray tubes which can be utilized with cathode ray tubes used as monitors or for television sets that are operated with different field frequencies and different number of scan lines. A specific image such as a fine checkerboard pattern or a fine line pattern is produced on the monitor which is to be adjusted and the image is then picked up with a solid state camera; the image magnification and resolution are selected such that the fine pattern is acquired with full resolution in the camera signal. The camera signal is evaluated using a known image processing system and the image focus of the image acquired by the camera is calculated by using histogram calculations. The width of the histogram curve is a measure of the image focus and the image focus is either manually or automatically adjusted.

REFERENCES:
patent: 3450833 (1969-06-01), Hobrough
patent: 3962722 (1976-06-01), Ciciora
patent: 4163308 (1979-08-01), Tawa et al.
patent: 4193086 (1980-03-01), Kwaguchi
patent: 4441120 (1984-04-01), Gerritsen
patent: 4551653 (1985-11-01), Hilsum
patent: 4607288 (1986-08-01), Freyberger
patent: 4746985 (1988-05-01), Waldron et al.
Japanese Abstract vol. 10, No. 297 E-444, 2353 Oct. 9, 1986.
Article, A Technigue for the Automated Measurement of the Resolution of Shadow-Mask CRT Displays by Veron and O'Callaghan SID 87 Digets, pp. 211-213.
Article in Funkschau 5/1986, pp. 40-42.

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