Video signal processing

Details Video signal processing Video signal processing

H - Electricity

04

N

350/53

H04N 5/38 (2006.01) H04N 5/262 (2006.01)

Patent

CA 1299737

ABSTRACT A method and apparatus for keying digital colour TV signals to avoid "stairstepping" of pixels at the edges of the key whilst 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 actually increasing the frequency of sampling.

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