Method and apparatus for keying a digital video signal

Details Method and apparatus for keying a digital video signal Method and apparatus for keying a digital video signal

1989-09-14

1991-08-27

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358183, H04N 974, H04N 5262, H04N 5272

Patent

active

050438000

ABSTRACT:
A method and apparatus for keying digital color TV signals to avoid "stairstepping" of pixels at the edges of the key while retaining a hard switch between the keyed scenes. This is achieved by comparing successive digital keying signals with a desired digital clip level. In the event that the clip level occurs between two successive digital signals an interpolation of the clip level between these is created fractionally. A digital representation of this fraction is then included in the keying signal so that keying is accomplished on a sub-pixel basis without acutally increasing the frequency of sampling.

REFERENCES:
patent: 4356512 (1982-10-01), Robers
patent: 4951145 (1990-08-01), Snashall et al.

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