Image coding method and system for providing reduced bit rate ar

Details Image coding method and system for providing reduced bit rate ar Image coding method and system for providing reduced bit rate ar

1996-11-08

1999-02-02

Au, Amelia

Image analysis

Image compression or coding

Lossless compression

358430, G06K 936

Patent

active

058676007

ABSTRACT:
A bi-level image coder for providing reduced bit rate arithmetic codes is disclosed, wherein each page of image to be coded is divided into a plurality of areas such as line groups, or blocks, and an arithmetic coder codes each of input pixels (the pixel S.sub.i) by using a predicted value of MPS (most probable symbol) and a predicted probability of LPS (least probable symbol) occurrence which are generated with a template and a LPS predicted probability table. The pixel attribute of the pixel S.sub.i is determined to one of a character image attribute, a dither/dot image attribute and a halftoned image attribute based on statistical properties of the area of the pixel S.sub.i. One of predetermined LPS predicted probability tables and one of predetermined templates are selected for each of the areas in operation. The coder may be so arranged as to following the JBIG standard. In one embodiment, a specific pixel of the template used for context data generation is moved to a position highly correlated with the pixel to be coded.

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Glen G, Langdon, Jr. "An Adaptive File Compression Algorithm", IBM Sa Jose Research Lab., San Jose, CA, RJ3460(41066), Apr. 23, 1982, Computer Science.
JBIG (Joint Bi-Level Image Coding Expert Group) T. 82.

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