Charge coupled device based blemish detection system and method

Details Charge coupled device based blemish detection system and method Charge coupled device based blemish detection system and method

1982-06-14

1984-06-12

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358139, 358213, H04N 718

Patent

active

044545410

ABSTRACT:
A system for detecting blemishes on an illuminted object, such as the screen of a kinescope, includes a charge coupled device (CCD). The signal from each CCD pixel is compared with the average of the signals of all pixels immediately adjacent to the pixel being investigated to provide a difference signal. The difference signal is compared to a threshold level and a blemish signal generated when the difference signal exceeds the threshold.

REFERENCES:
patent: 3781574 (1973-12-01), White et al.
patent: 4253120 (1981-02-01), Levine
patent: 4264930 (1981-04-01), White
patent: 4276609 (1981-06-01), Patel
patent: 4344091 (1982-08-01), Gardner
patent: 4367492 (1983-01-01), Harada
patent: 4392157 (1983-07-01), Garcia
patent: 4399464 (1983-08-01), Hix
"CCD Tracker for High Accuracy Guidance Applications," by Phil M. Salomon of Jet Propulsion Laboratory--received by applicant 6/16/80.
"Charge-Coupled Devices Tackle TV Imaging," by A. P. King & M. Farrier in Electronic Design, pp. 183-190, Aug. 6, 1981.
A ten-page brochure by Photometrics Ltd. of Tucson, Arizona describes a Model CH81-A camera head and Model 80A Universal Camera Controller, published prior to Jun. 1981.

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