Dither-quantized signalling for color television

Details Dither-quantized signalling for color television Dither-quantized signalling for color television

1978-04-19

1981-06-23

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 4, H04N 932, H04N 9493

Patent

active

042754119

ABSTRACT:
One or more of the video components of prior art are quantized coarsely before being sent to a receiver. To prevent perceptible loss of picture information and to minimize visible artifacts, suitable ordered dither is added before a component is quantized. The transmitted signal is preferably also sampled at the transmitter and resampled and requantized in the receiver for combatting noise and distortion. Some forms of the invention are compatible with prior art receivers. Other forms provide compressed digital signalling and coarsely quantized pulse-amplitude modulation.

REFERENCES:
patent: 3701846 (1972-10-01), Zenzefilis
patent: 3739082 (1973-06-01), Lipple
patent: 3858240 (1974-12-01), Golding
patent: 4015286 (1977-03-01), Russell
Limb, "Digital Coding of Color Picturephone Signals by Element", Differential Quantization, IEEE Trans. on Communication Technology, vol. COM-19, No. 6, Dec. 1971, pp. 992-1005.

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