Method for arithmetically encoding half-tone image in image proc

Details Method for arithmetically encoding half-tone image in image proc Method for arithmetically encoding half-tone image in image proc

1993-05-28

1995-06-06

Rogers, Scott A.

Facsimile and static presentation processing

Facsimile

Reduced time or bandwidth for static image communication

358426, 3582612, 358429, 358430, 382232, H04N 141

Patent

active

054227348

ABSTRACT:
An arithmetic coding method for encoding each pixel of image containing half-tones in an image processing system is provided. This method includes the steps of: initializing an encoder before encoding each line; reading a pixel of a dithered image signal; determining reference pixels being an immediately preceding pixel, and a preceding pixel by a horizontal size of a dithering matrix for the read pixel; selecting a corresponding context number according to the values of the two reference pixels and a remainder obtained by dividing a horizontal position of the read pixel by the horizontal size of the dithering matrix; identifying context information corresponding to the context number, the context information including a more probable symbol and a probability therefor; encoding the more probable symbol if it matches the read pixel value, and encoding a less probable symbol otherwise; and updating a probability estimation of the context information.

REFERENCES:
patent: 4266249 (1981-05-01), Chai et al.
patent: 4766499 (1988-08-01), Inozuka
patent: 4901363 (1990-02-01), Toyokawa

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