Compression of video signals

Details Compression of video signals Compression of video signals

1991-12-19

1993-05-25

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358133, 358138, H04N 1104

Patent

active

052145026

ABSTRACT:
To enable a digital composite color video signal (NTSC or PAL) to be compressed directly, that is without dividing it into its components and compressing the components separately, the digital composite color video signal is decorrelated, for example by spatial sub-band filtering, to form data sets, for example sub-bands, representing dc luminance information, ac luminance information and dc chrominance information. The data sets are then quantized in accordance with respective quantization values from a quantization matrix, those quantization values being such that the amount of quantization of each of some of the data sets to which the dc luminance information and the dc chrominance information is at least predominantly confined is less than the average of the amounts of quantization of the remaining data sets. At least some of the quantized data sets are then entropy encoded.

REFERENCES:
patent: 4780761 (1988-10-01), Daly
patent: 4969040 (1990-11-01), Gharavi
patent: 5049992 (1991-09-01), Citta
patent: 5097331 (1992-03-01), Chen
patent: 5109451 (1992-04-01), Aono
IEEE Trans Comm., COM-34(3), Mar. 1986, pp. 310-319.

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