Chroma key switching signal generator

Details Chroma key switching signal generator Chroma key switching signal generator

1981-04-10

1983-05-31

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 9535

Patent

active

043863639

ABSTRACT:
A wideband chroma key switching signal is generated from lower bandwidth chrominance signals in a video signal by first conventionally generating a chroma key switching signal from these chrominance signals, and then detecting high frequency transition components in the corresponding luminance signal. These luminance signal high frequency components are then added to the switching signal in a manner that insures that their polarities match, thereby generating a higher bandwidth chroma key switching signal. This resultant higher bandwidth chroma key switching signal is used to control cross fade amplifiers which function to output either the video signals of a first or a second scene with linear transitions between these video signals during switching.

REFERENCES:
patent: 4021841 (1977-05-01), Weinger
patent: 4041527 (1977-08-01), Rayner
patent: 4051520 (1977-09-01), Davidse
patent: 4122490 (1978-10-01), Lish
patent: 4196449 (1980-04-01), Tama
Rawlings, R., "Chromakey in a Digital System," International Broadcast Engineer, Sep. 1980, pp. 30-31.
Davidse, J. and Koppe, R. P., "A Chroma-Key System Insensitive to Variations of the Background Illumination," SMPTE Journal, Mar. 1977, vol. 86, pp. 140-143.
Wright, R. C. H. and Fletcher, R. E., "Development of Operational Techniques Using C.S.O. (Chromakey) and Technological Developments That Could Effect a Change in Production Methods" International Broadcasting Convention, Sep. 25-29, 1978.
TRW Descriptive Brochure, Nov. 1977.

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