Method of separating a foreground picture signal from a mixed pi

Details Method of separating a foreground picture signal from a mixed pi Method of separating a foreground picture signal from a mixed pi

1994-02-02

1995-07-25

Groody, James J.

Television

Image signal processing circuitry specific to television

Special effects

348592, H04N 975

Patent

active

054366712

ABSTRACT:
In a method of separating a foreground picture signal FG from a mixed picture signal MG having a key color KC and transition colors to this key color in key regions, the components of the key color and the transition colors are vectorially subtracted from the mixed picture signal in dependence upon a control signal k which, with a continuous variation, assumes values of between 1 in the region of the key color KC and O at mixed boundaries. Color errors due to a gamma pre-correction are obviated in that the vectorial subtraction is performed in accordance with the equation FG=MG-k*KC(f), in which KC(f) is chosen in dependence upon the color intensity as far as its angle in the C.sub.b /C.sub.r color plane is concerned.

REFERENCES:
patent: 5301016 (1994-04-01), Gehrmann
Devereaux, "Television Animation Store: Digital Chroma-Key and Mixer Units", Research Report 1984/16 of the British Broadcasting Corporation Engineering Division.

Affiliated with

Also associated with

Rating

Method of separating a foreground picture signal from a mixed pi does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of separating a foreground picture signal from a mixed pi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of separating a foreground picture signal from a mixed pi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-743103