Picture quality testing method and apparatus for color cathode-r

Details Picture quality testing method and apparatus for color cathode-r Picture quality testing method and apparatus for color cathode-r

1989-02-13

1990-10-16

Shepperd, John W.

Electricity: measuring and testing

Electric lamp or discharge device

Cathode-ray tube

358 10, G01R 3124

Patent

active

049638289

ABSTRACT:
For the purpose of automated evaluation of white uniformity, the apparatus comprises a color television camera for picking up an image of white color displayed on the color cathode-ray tube, a circuit for separating color signals from the output signal of the color television camera, A/D converters for converting the analog color signals into digital color signals, memories for storing the digital color signals, and a computer for analyzing the contents of the memories. A nonuniform color portion is extracted from the color distribution of the display on the cathode-ray tube, and quantities of various features of the nonuniform color portion, for example, the hue, saturation and area of the nonuniform color portion and the degree of change in the saturation at the marginal edge contour of the nonuniform color portion are calculated by the computer to provide parameters used for evaluation of the white uniformity. Then, the white uniformity of the display on the color cathode-ray tube is quantitatively evaluated on the basis of the previous experimental, visually evaulated relation between the individual parameters and the results of visual evaluation of the white uniformity.

REFERENCES:
patent: 2657254 (1953-10-01), Wintringham
patent: 4254432 (1981-03-01), Nakahata
patent: 4602272 (1986-07-01), Duschl
patent: 4706108 (1987-11-01), Kumagai
patent: 4725879 (1988-02-01), Eide et al.
patent: 4742387 (1988-05-01), Oshima
patent: 4746970 (1988-05-01), Hosokawa et al.
patent: 4797619 (1989-01-01), Austin et al.
patent: 4814858 (1989-03-01), Mochizuki et al.
patent: 4893925 (1990-01-01), Sweeney et al.

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