Vector DPCM image coding method and apparatus

Details Vector DPCM image coding method and apparatus Vector DPCM image coding method and apparatus

1987-07-24

1989-03-07

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35826102, 341 50, H04N 712

Patent

active

048111120

ABSTRACT:
A method and apparatus for encoding a graphics image by treating the image as plurality of cells. Each cell comprises a plurality of pixels. The states of the pixels of a cell are predicted using pixel states of priorly processed adjacent cells. A differential cell containing differential pixel states is created by comparing the predicted pixel states to the corresponding actual pixel states of the cell. The differential cell is compared with a plurality of predefined library differential cells to locate a closest match and a vector code identifying the located closest matching library cell is transmitted to a decoder. The vector code is used at the decoder to reconstruct an approximation of the image cell using a library of differential cells identical to the library of differential cells used to generate the vector code at the encoder. A variation of the invention dynamically adjusts the size of a cell to compensate for excessive prediction error.

REFERENCES:
patent: 3980809 (1976-09-01), Cook
patent: 4513426 (1985-04-01), Jayant
patent: 4563671 (1986-01-01), Lim et al.

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