Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1976-05-18
1978-05-30
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
352 53, 358185, H04N 522, H04N 524, G03B 1508
Patent
active
040926737
ABSTRACT:
The conventional chroma key television process is used to effect composite images by employing a master camera whose subject may be live action against a single hued background and a slave camera directed at a static background, such as a miniature set or a back-projection screen. The inventive process includes the steps of linking the master and slave cameras so that a sensing of the current flow in the actuating motors for panning, dollying, trucking or otherwise changing the master camera causes a scale-related like motion of the slave camera, each camera moving in proper ratio with respect to its subject. The slave camera image is fed to the conventional mixer and fills that portion of the composite image occupied by the single hued background of the master camera subject image. A time delay may slow transmission of the master camera to the mixer if it is found that the action or motion of the slave camera lags behind the like action or motion of the master camera.
REFERENCES:
patent: 2725423 (1955-11-01), Graham
patent: 2968211 (1961-01-01), Douglas
patent: 3778542 (1973-12-01), Hanseman
patent: 3862358 (1975-01-01), Wolff
patent: 3914540 (1975-10-01), Slater
Britton Howard W.
Gribble Wm. Jacquet
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