Method of compressing and reconstructing image signals by vector

Details Method of compressing and reconstructing image signals by vector Method of compressing and reconstructing image signals by vector

1988-02-25

1989-01-10

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358263, H04N 7133

Patent

active

047977396

ABSTRACT:
A method of compressing and reconstructing image signals by vector quantization comprises the steps of dividing two-dimensional image signals into blocks each comprising a fixed number of samples, selecting a vector that corresponds with the minimum distortion to the image signals in each block from a code book comprising a plurality of different vectors and prepared by defining the fixed number of vector elements, encoding the information on the selected vector to correspond to each block, and taking the vector elements of the vector, which the encoded information represents, as reconstructed signals of each block. In the case where the reconstructed signal attains a value between image signals "a" and "b" and having a relationship of b-a=.alpha. where .alpha. denotes the minimum level difference corresponding to a density resolution of an image reproducing apparatus, the reconstructed signal is transformed to the image signal "a" or "b" by giving a larger probability weight to the image signal "a" or "b", whichever is closer to the reconstructed signal.

REFERENCES:
patent: 4410916 (1983-10-01), Pratt
patent: 4494150 (1985-01-01), Brickman
patent: 4703362 (1987-10-01), Deutermann
patent: 4706264 (1987-11-01), Cung
patent: 4724483 (1988-02-01), Shinada

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