Television – Image signal processing circuitry specific to television – Chrominance-luminance signal separation
Patent
1995-12-29
1997-05-27
Hsia, Sherrie
Television
Image signal processing circuitry specific to television
Chrominance-luminance signal separation
348665, H04N 978
Patent
active
056336896
ABSTRACT:
A digital filter (20,30) separates an M-bit (12) chrominance component (C12) from an N-bit (8) digital composite video signal (CV) supplied thereto, M (12) being greater than N (8) due to arithmetic operations (24,44,46,50) required for the separation. The separated M bit chrominance component is reduced to N-bits and subtracted from the composite video signal to provide a separated luminance component. For bit reduction, the separated chrominance component (C12) is subjected to symmetrical rounding (100A or 100B and 104) and limiting (104). Advantageously, symmetrical rounding of the chrominance component provides reduces a tendency for the luminance component to exhibit contouring when displayed.
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Hague John A.
Kranawetter Greg A.
Willis Donald H.
Coalter Richard G.
Emanuel Peter M.
Hsia Sherrie
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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