Digital encoding and decoding of color video signals

Details Digital encoding and decoding of color video signals Digital encoding and decoding of color video signals

1977-08-19

1978-11-14

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 932

Patent

active

041258568

ABSTRACT:
A system for encoding and decoding a color video signal wherein information obtained from the luminance component is used to reduce the amount of color information which must be sent from encoder to decoder. In the encoder, at least two different predictions are made of the present luminance sample, based upon individual or combined values of the previous luminance samples. Each prediction is evaluated against the true luminance value, to determine the best predictor pattern or strategy. If good correspondence exists between the true luminance value and the best prediction thereof, the same prediction strategy is used to predict the present color component value from previous color component values. The predicted color component (chrominance or chromaticity) value is not sent to the decoder, but is stored in the encoder; the decoder reconstructs the same predicted color component value by determining the best luminance predictor and then using that predictor on previous color component values, in a manner identical to that used in the encoder.
If the correspondence between true and predicted luminance values is not good, it is assumed that the color component value is "unpredictable", so that the true color component value is then transmitted to the decoder. The decoder similarly detects the luminance prediction error, and therefore "expects" the true color component value transmission. The encoder further includes means for comparing each color component prediction with the true value thereof, to detect cases where the luminance is well predicted but the color component value is not. In this event, true color component value is also transmitted to the decoder and the luminance signal is intentionally "distorted" to signal this condition.

REFERENCES:
patent: 3773971 (1973-11-01), Sainte-Beuve
patent: 3803348 (1974-04-01), Limb et al.
patent: 3860953 (1975-01-01), Cutler et al.
patent: 4023199 (1977-05-01), Netravali et al.

Affiliated with

Also associated with

Rating

Digital encoding and decoding of color video signals does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital encoding and decoding of color video signals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital encoding and decoding of color video signals will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1305108