Adaptive video peaking circuitry using cross-faders

Details Adaptive video peaking circuitry using cross-faders Adaptive video peaking circuitry using cross-faders

1993-03-17

1995-05-16

Groody, James J.

Television

Image signal processing circuitry specific to television

Chrominance-luminance signal separation

348666, 348630, H04N 978

Patent

active

054165326

ABSTRACT:
Horizontal and vertical peaking signals are separated from a video signal by combining variously delayed responses to the video signal. A cross-fader combines the separated horizontal and vertical peaking signals in proportions determined by a cross-fader control signal. A correlator responds to ones of the variously delayed responses to the video signal for generating an output signal representative of the relative degrees of vertical and horizontal correlation in the video signal. The correlator output signal addresses a read-only memory that supplies the cross-fader control signal. The adaptively generated peaking signal is suitable for adjustably peaking a luminance component extracted from the video signal, where that video signal is a composite signal also including a chrominance component. The extraction of the luminance component is preferably done on an adaptive basis, generating horizontal and vertical comb filter responses by suitably combining the variously delayed responses to the video signal and, with a further cross-fader, combining the horizontal and vertical comb filter responses in proportions determined by the cross-fader control signal.

REFERENCES:
patent: 4178609 (1979-12-01), Beutel
patent: 4498099 (1985-02-01), Pritchard
patent: 4498100 (1985-02-01), Bunting et al.
patent: 4819062 (1989-04-01), Donghil et al.
patent: 5097321 (1992-03-01), Stern
patent: 5121209 (1992-06-01), Smith

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