Method of generating a series of DPCM code words, method of stor

Details Method of generating a series of DPCM code words, method of stor Method of generating a series of DPCM code words, method of stor

1990-04-12

1991-05-07

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 13, 358135, 358310, 358335, H04N 1104

Patent

active

050141279

ABSTRACT:
Image data (YUVAR) are received from an image source and separated into luminance (Y) and chrominance (U,V) values. These are DPCM coded (LCO,CCO) to generate separate arrays (LAR, CAR) of delta codes. The arrays (LAR,CAR) are received in a display apparatus via a limited bandwidth data channel (120). The data channel may in particular comprise an optical disc reading device. The arrays (LAR and CAR) are then expanded and combined to generate a desired array (DAR) of standard composite code words. By coding luminance and chrominance separately, the chrominance data can be coded at low resolution relative to a display chrominance resolution so as to obtain a faster image update rate with minimal loss of perceived image quality. The expanding and combining can be performed under program control in a standard display apparatus, for example a Compact Disc-Interactive (CD-I) player.

REFERENCES:
patent: 4665436 (1987-05-01), Osborne
patent: 4785349 (1988-11-01), Keith

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