Method of adaptive arithmetic encoding/decoding according to JBI

Details Method of adaptive arithmetic encoding/decoding according to JBI Method of adaptive arithmetic encoding/decoding according to JBI

1997-09-12

1999-09-28

Coles, Edward L.

Image analysis

Image compression or coding

Adaptive coding

382247, 382238, 382233, 382232, 358430, 3582612, 3582614, 358426, 358433, H04N 1417

Patent

active

059601175

ABSTRACT:
To reduce computational time of adaptive arithmetic encoding/decoding according to JBIG standard, a step (S21) of reading the learning table and a step (S22) of reading the prediction probability table in a pixel encoding step, which is performed when a context of all white can be applied, are omitted for a pixel following a preceding pixel whereof a normalization process (S27) is not performed, by making use of the prediction and the false approximation applied for the preceding pixel, in the method of invention.

REFERENCES:
patent: 5392362 (1995-02-01), Kimura et al.
patent: 5491564 (1996-02-01), Hongu
patent: 5736947 (1998-04-01), Imanaka
patent: 5745245 (1998-04-01), Shibata
patent: 5781136 (1998-07-01), Imanaka
patent: 5881173 (1999-03-01), Ohmori

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