Comparative Analysis of Gray Scale Coding Techniques for Group 4 Facsimile
DELTA INFORMATION SYSTEMS INC HORSHAM PA
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This compares bit-plane coding BPC, differential pulse code modulation DPCM, transform coding, and predictive vector quantization PVQ to determine their relative effectiveness for the addition of gray scale to Group 4 facsimile. At present, the CCITT Recommendation for Group 4 facsimile permit the transmission of only black and white imagery black print on white paper not photographic. Consequently, most gray scale imagery like photographs are usually distorted by Group 4 equipments. To correct this, the CCITT is planning at add gray scale to the Group 4 Recommendations as an option. The aforementioned coding techniques have already been studied individually, but they havent been compared to one another, nor have they been ranked according to their suitability for Group 4 facsimile.
- Command, Control and Communications Systems