Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1977-03-17
1979-03-06
Martin, John C.
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 9535
Patent
active
041433971
ABSTRACT:
A comb filter arrangement for processing video signals containing frequency interleaved image representative luminance and chrominance components provides improved color definition of reproduced images in the presence of chrominance components of adjacent horizontal image lines which differ perceptibly from each other in amplitude or phase. The comb filter comprises at least one signal delay element arranged to provide a delay equal to one horizontal line scanning interval, at least one gain controllable element and sum and difference networks for combining delayed and undelayed video signals to provide relatively separated luminance and chrominance components. A control network coupled to the comb filter provides a control signal representative of the magnitude of signal components within the chrominance signal frequency range for controlling the gain of the gain controllable element. In one embodiment, separated luminance output signals from the sum network are coupled to the control network to detect the presence of contaminating signal components attributable to non-recurrent chrominance components. The gain of at least the difference network is varied in accordance with the magnitude of the detected signal to suppress the effect of the non-recurrent chrominance signals on a reproduced color image.
REFERENCES:
patent: 3836707 (1974-09-01), Murakami et al.
Kurdyla Ronald H.
Martin John C.
Meagher William H.
RCA Corporation
Whitacre Eugene M.
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