Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1975-12-22
1977-10-11
Martin, John C.
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 916
Patent
active
040532038
ABSTRACT:
Automatic centering apparatus for use in a television camera having first and second video pickup devices for registering the video signals produced thereby. A first delay circuit responds to the first video signal to provide a first delayed signal, and a second delay circuit responds to the second video signal to provide a second delayed signal. The second delay circuit provides a time delay substantially equal to twice the delay provided by the first delay circuit. If the undelayed first and second video signals are registered properly, the delayed and undelayed second video signals are misregistered by equal yet opposite amounts from the first delayed signal. Relative misregistration of the two signals is detected by subtracting the delayed first video signal from the delayed and undelayed second video signals, and then clipping, integrating and comparing the two difference signals. Two comparator outputs indicate respectively when the first clipped and integrated signal is higher than the second, and when the second clipped and integrated signal is higher than the first. These two comparator outputs control the changes in amplitude of an analog output signal which serves as the registration correction signal for one of the two video pickup devices.
REFERENCES:
patent: 3830959 (1974-08-01), Dischert et al.
patent: 3903472 (1975-09-01), Wahl
patent: 3925812 (1975-12-01), Blom et al.
Harris Corporation
Martin John C.
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