Digital video processing system with mixing prefilter

Details Digital video processing system with mixing prefilter Digital video processing system with mixing prefilter

1991-07-25

1993-01-19

Coles, Sr., Edward L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358135, H04N 712

Patent

active

051811006

ABSTRACT:
A method and system for combining digital data signals representing digitized images in a manner avoiding aliasing effects. In a class of preferred embodiments, the inventive system includes two data channels, mutiplication circuitry in at least one of the data channels for multiplying the data signal in that channel by a multiplicative factor signal, and circuitry for combining the output of the data channels. Each data signal to be multiplied is prefiltered in an anti-aliasing filter in order to remove high frequency components that would otherwise result in aliasing error during the multiplication operation. The anti-aliasing filter is preferably an adaptive finite impulse response filter which receives the mutliplicative factor signal, and is transparent during times when the multiplicative factor signal has a constant value.

REFERENCES:
patent: 4691293 (1987-09-01), Conboy
patent: 4763186 (1988-08-01), Belmares-Sarabia et al.
patent: 4967272 (1990-10-01), Kao et al.

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