Real time programmable chroma keying with shadow generation

Details Real time programmable chroma keying with shadow generation Real time programmable chroma keying with shadow generation

2006-02-28

2006-02-28

Kostak, Victor R. (Department: 2714)

Television

Image signal processing circuitry specific to television

Special effects

C348S598000, C348S597000

Reexamination Certificate

active

07006155

ABSTRACT:
A system for forming composite video images from one or more foreground images and one or more background images. In one embodiment, s sum of a suppressed foreground image signal with weight α, with one or more selected foreground colors suppressed, and a background image signal with weight 1−α′ (0≦α′≦1) is formed, where a and α′ may vary from pixel to pixel and with time. In another embodiment, a shadow from a selected foreground image is impressed on selected pixels of a background image. In another embodiment, foreground suppression and shadowing are combined, optionally by retrofitting, using an existing α-mixer or a newly constructed α-mixer. Provision of a chroma key map allows a foreground image shadow to be prescribed pixel by pixel, including a transition region in which the shadowed image slowly disappears.

REFERENCES:
patent: 4109278 (1978-08-01), Mendrala et al.
patent: 6-339150 (1994-12-01), None

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