Non-linear dynamic coring circuit for video signals

Details Non-linear dynamic coring circuit for video signals Non-linear dynamic coring circuit for video signals

1983-08-23

1985-08-20

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358167, H04N 514, H04N 521

Patent

active

045367965

ABSTRACT:
In a television receiver, a horizontal peaking signal is added to a luminance signal to accentuate its horizontal detail. The peaking signal is subject to a coring action with the amount of coring subject to dynamic control as a function of luminance signal content. The sense of coring control is such that a greater amount of coring is associated with dark portions of a scene to be reproduced than is associated with bright portions thereof. The coring control is non-linear and exhibits one control characteristic over a first range of luminance signal levels between a white image limit and a threshold level in the black image direction, and a different control characteristic over a second range of signal levels between the threshold level and the black image limit for restricting the amount of coring produced as the black limit is approached.

REFERENCES:
patent: 4437123 (1984-03-01), Harlan
patent: 4437124 (1984-03-01), Cochran

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