Adaptive encoding and decoding of bi-level images

Details Adaptive encoding and decoding of bi-level images Adaptive encoding and decoding of bi-level images

2006-05-23

2006-05-23

Couso, Jose L. (Department: 2621)

Image analysis

Image compression or coding

Lossless compression

Reexamination Certificate

active

07050643

ABSTRACT:
A system and process for encoding and later decoding of bi-level images that does not use arithmetic coding, but whose performance is close to that of state-of-the-art coders such as JBIG, JBIG-2, and JB2. In general, the present bi-level coder (BLC) uses two context-based adaptive modules: 1) an adaptive predictor controlled by low-resolution probability estimates that is used to map the original pixels explicitly into prediction error pixels, and 2) a backward-adaptive Run-Length-Rice (RLR) coder that encodes the prediction error pixels. That's contrary to the usual approach where the context-dependent probability estimate controls both pixel prediction and adaptive entropy coding. Due to its simplicity, in many applications BLC may be a better choice other current coders.

REFERENCES:
patent: 6549676 (2003-04-01), Nakayama et al.
patent: 6560365 (2003-05-01), Nakayama et al.

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