Cinematic dithering for television systems

Details Cinematic dithering for television systems Cinematic dithering for television systems

1985-09-23

1988-07-19

Hix, L. T.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 37, H04N 530

Patent

active

047588934

ABSTRACT:
Dither-quantizing with Cinematic Dithers permits coarse quantization of the Nyquist samples transmitting television luminance or chrominance in analog or digital signals. Means are disclosed for generating improved p-phase Cinematic Dithers corresponding to any desired value of p and to liberal choice in the number of dither sizes. In general, a selected random or ordered basic arrangement of the dither is altered cyclically from frame to frame and recurs every p television frames. The frame-to-frame changes are also tailored to the spatial and temporal filtering characteristics of the human visual system in order that the Nyquist samples can be restricted to very few amplitude levels without corresponding impairment of perceived picture quality.

REFERENCES:
patent: 3244808 (1966-04-01), Roberts
patent: 3739082 (1973-06-01), Lippel
patent: 4275411 (1981-06-01), Lippel
patent: 4460924 (1984-07-01), Lippel
patent: 4568966 (1986-02-01), Lippel
patent: 4617597 (1986-10-01), Lippel
patent: 4652905 (1987-03-01), Lippel

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