System for increasing the sharpness in a television picture

Details System for increasing the sharpness in a television picture System for increasing the sharpness in a television picture

1978-05-01

1980-06-24

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 9535, H04N 9539

Patent

active

042098017

ABSTRACT:
The system herein for use in a television camera system normally generates contour correction signals from the green video signals but when the green video signal level falls below a predetermined level, the contour correction signals are also generated from the red video signal. The system allows for normal misregistration of the camera by extending the green video signal beyond the normal time period and by delaying the red video signal approximately one-half the amount the green video signal is extended to center the red signal with respect to the extended green video signal. The extended green video signal and delayed red video signals are compared and when the delayed red video signal amplitude exceeds the green video signal amplitude by a predetermined amount the difference signal contributes to the generation of the contour correction signals.

REFERENCES:
patent: 3546372 (1970-12-01), Dischert et al.
patent: 3681520 (1972-08-01), Schneider
patent: 3732360 (1973-05-01), Breimer et al.

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