Adaptive block transform image coding method and apparatus

Details Adaptive block transform image coding method and apparatus Adaptive block transform image coding method and apparatus

1987-06-02

1988-09-27

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358138, H04N 7133

Patent

active

047745746

ABSTRACT:
In a method and apparatus for transmitting a digital image over a limited bandwidth communication channel, an image is block transformed to produce blocks of transform coefficients; the transform coefficients are quantized in accordance with a model of the visibility of quantization error in the presence of image detail; the quantized coefficients are encoded with a minimum redundancy code; and the coded, quantized transform coefficients are transmitted.

REFERENCES:
patent: 4268861 (1981-05-01), Schreiber
patent: 4302775 (1981-11-01), Widergren
"Adaptive Coding of Monochrome and Color Images", by Chen and Smith, IEEE Transactions on Communications, vol. COM-25, No. 11, pp. 1285-1292, Nov. 1977.
"A Visual Weighed Cosine Transform for Image Compression and Quality Assessment" by N. B. Nill, IEEE Transactions on Communications, vol. COM-33, pp. 551-557.

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