Chroma keyer with fringe control offset

Details Chroma keyer with fringe control offset Chroma keyer with fringe control offset

1993-06-21

1994-05-17

Groody, James J.

Television

Image signal processing circuitry specific to television

Special effects

348590, H04N 975

Patent

active

053133048

ABSTRACT:
A chroma keyer with fringe control offset adds a fringe control offset value to a correlation output produced by a hue selector. The hue selector compares the hues of a foreground image, representing a foreground object in front of a reference matte background, with a reference hue corresponding to the reference matte background to produce the correlation output. The adjusted correlation signal is then negatively clipped and provided at the output of the hue selector as a hue select signal that is used for deriving a chroma key signal and for providing background suppression to the foreground image.

REFERENCES:
patent: 4409611 (1983-10-01), Vlahos
patent: 5032901 (1991-07-01), Vlahos
patent: 5251016 (1993-10-01), Delwiche

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