Chroma noise reduction and transient improvement

Details Chroma noise reduction and transient improvement Chroma noise reduction and transient improvement

1988-12-30

1990-06-19

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 521

Patent

active

049358065

ABSTRACT:
A digital chroma signal processor samples groups of three successive pixels and develops first and second difference signals therefrom. The first difference signals indicate changes in color and the second difference signal peaks those changes when combined with the original signal. A threshold detector determines when the changes are great enough to need peaking and operates a multiplexer that supplies a transient enhanced signal for a chroma signal above the threshold or a median signal for a chroma signal below the threshold. The median signal is developed for each sample group, along with minimum and maximum signals, by a criteria filter. A limiting coefficient adjusts the minimum and maximum signals to provide controlled amounts of overshoot and undershoot in the processed chroma signal.

REFERENCES:
patent: 4613905 (1986-09-01), Ichinoi
patent: 4698673 (1987-10-01), Johnson
patent: 4706112 (1987-11-01), Faroudja
patent: 4766486 (1988-08-01), Ozaki
patent: 4803547 (1989-02-01), Stratton
patent: 4809070 (1989-02-01), Lake, Jr.

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