Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1974-10-01
1976-03-23
Libman, George H.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 23, H04N 934
Patent
active
039464318
ABSTRACT:
A color video system in which the chrominance portion of a composite video signal, such as an off-air TV signal, is transmitted or recorded in the form of a trisequential sequence containing in lieu of the original colors R, G, B the substitute colors R', G' B', and in which at the receiving or playback end a luminance signal Y.sub.M =0.33(R'+G'+B') is derived from the trisequential substitute color signal, where R', G', B' are chosen so that Y.sub.M also satisfies the relationship Y.sub.M =0.30R + 0.59G + 0.11B required for black and white compatibility. The technique used at the transmitting or recording end obviates the necessity of first developing for this purpose the original colors and then deriving therefrom the substitute colors by the addition to the former of a separate signal Z= -0.03R + 0.26G - 0.22B, as proposed in the prior art. This simplification is attained herein by immediately demodulating the chrominance portion trisequentially along axes related to the substitute colors, preferably along substitute-color difference axes R'-Y, G'-Y, B' -Y.
REFERENCES:
patent: 3786178 (1974-01-01), Scholz
BASF - Aktiengesellschaft
Libman George H.
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