Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1977-02-04
1979-03-06
Richardson, Robert L.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 37, 358 31, H04N 900
Patent
active
041433963
ABSTRACT:
A digital chrominance separating and processing system which minimizes the effects of the inherent incomplete separation of the chrominance and luminance signals at the color edges of a television picture, when attempting to reproduce both frames of a composite color television signal from a single field or frame. The system digitally conditions the chrominance signal extracted from the available field or frame, by pre-selecting the degree of de-saturation of the chrominance in the reconstituted color frames of the composite color television signal, in the region of the color edges. That is, the degree of chrominance saturation at the color edges is compromised in one reconstituted frame, but is improved in the next frame. To this end, the frequency components of the extracted chrominance are selectively rotated on alternate frames relative to the luminance, whereby upon subsequent summation, the chrominance added back to the luminance in alternate frames has magnitudes which are equal, or near equal, at the regions of the color edges. Thus, the resulting reconstituted composite color television signal does not experience visibly objectionable chrominance fluctuations at the color edges.
REFERENCES:
patent: 4007486 (1977-02-01), Inaba et al.
Almeida George B.
Ampex Corporation
Clay Robert G.
Richardson Robert L.
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