Television systems transmitting dither-quantized signals

Details Television systems transmitting dither-quantized signals Television systems transmitting dither-quantized signals

1990-01-04

1992-09-15

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 713

Patent

active

051482738

ABSTRACT:
Television systems that transmit dither-quantized samples for psychovisually compressed signalling are improved by substituting novel multi-phase dithers of the invention for previously known multi-phase dithers. The improved dithers comprise ordered-dither frame patterns and typically have sixteen or eight phases and sixteen sizes of dither samples. A first variety, not self-interpolating, merely shifts the frame-pattern structure from frame-to-frame. Methods and means are disclosed for generating novel self-interpolating dithers with sixteen or eight phases, including preferred dithers. Self-interpolating dithers are generally superior and they also facilitate receiver display of more quantum levels than actually transmitted.

REFERENCES:
patent: 3739082 (1973-06-01), Lippel
patent: 4143724 (1979-03-01), Itani
patent: 4447803 (1984-05-01), Crosby et al.
patent: 4758893 (1988-07-01), Lippel

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