Motion adaptive frequency folding method and circuit

Details Motion adaptive frequency folding method and circuit Motion adaptive frequency folding method and circuit

1992-06-24

1994-04-12

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358335, 348431, H04N 977, H04N 718

Patent

active

053030591

ABSTRACT:
A motion adaptive frequency folding method and circuits thereof for folding high-frequency components over low-frequency components of a brightness signal for enabling recording of a video signal having a full bandwidth onto a recording medium having a restricted bandwidth in order to improve resolution of a video image by preventing deterioration of the video image due to artifacts and noise. The motion adaptive frequency folding method comprises the steps of detecting high-frequency components above a reference frequency band and low-frequency components below the reference frequency band of the brightness signal, detecting a motion coefficient indicative of motion of an image from the brightness signal, controlling a magnitude of the high-frequency components and limiting transmission of the high-frequency components of the brightness signal in dependence upon said motion coefficient, and folding the high-frequency components above said reference frequency band having relative magnitudes controlled and limited by said motion coefficient over the low-frequency components below the reference frequency band of the brightness signal to produce a folded brightness signal.

REFERENCES:
patent: 4831463 (1989-05-01), Faroudja
patent: 5036386 (1991-07-01), Yasumoto et al.
patent: 5083203 (1992-01-01), Ko et al.
patent: 5113262 (1992-05-01), Strolle et al.

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