Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1985-09-25
1987-06-23
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 93, 358210, 358219, 358903, 351226, H04N 718
Patent
active
046757368
ABSTRACT:
In an eye field tester, a vidicon camera observes the eye being tested and relays the resultant low light level image to the periphery of a digital display. The digital display contains both an image of the eye on the periphery and the plot of the visual field of the eye under test in the center. The vidicon observing the position of the eye has its horizontal and vertical sync pulses software generated to presettable counters. These counters generate corresponding delayed horizontal sync and vertical sync pulses for the vidicon. As a result of the delayed sync pulses, the central eye image of the vidicon is offset to the periphery of the digital screen (typically to the upper left-hand portion thereof). The offset image is gated into character spaces on the digital screen utilizing software generated character attribute.
REFERENCES:
patent: 3787619 (1974-01-01), Wolff
patent: 3961133 (1976-06-01), Bennett
patent: 3984624 (1976-10-01), Waggener
patent: 4384338 (1983-05-01), Bennett
patent: 4393394 (1983-07-01), McCoy
patent: 4561738 (1985-12-01), Humphrey
patent: 4599611 (1986-07-01), Bowker
Humphrey William E.
Lehmer Donald E.
Britton Howard W.
Humphrey Instruments Inc.
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