Compression of bi-level images with explicit representation...

Details Compression of bi-level images with explicit representation... Compression of bi-level images with explicit representation...

2007-04-12

2008-01-08

Tran, Phuoc (Department: 2624)

Image analysis

Image compression or coding

Including details of decompression

C382S244000

Reexamination Certificate

active

07317838

ABSTRACT:
A system and method facilitating compression of bi-level images with explicit representation of ink clusters is provided. The present invention includes a cluster shape estimator that analyzes connected component information, extracts clusters and stores the cluster in a global dictionary, a page dictionary or a store of unclustered shapes. A bitmap estimation from clusters component determines dictionary positions for clusters stored in the global dictionary which are then encoded. A cluster position estimator determines page positions of clusters of the global dictionary and/or the page dictionary that are then encoded. Further, the global dictionary, the page dictionary and the store of unclustered shapes are also encoded.

REFERENCES:
patent: 6256415 (2001-07-01), Ratnakar
patent: 6477280 (2002-11-01), Malvar
patent: 6512793 (2003-01-01), Maeda
patent: 6876773 (2005-04-01), Mizuno et al.
Microsoft Cabinet SDK, Microsoft Corporation, Updated Mar. 20, 1997, Last viewed Jun. 29, 2004, 1 page.
J.H. Witten, A. Moffat, and T.C. Bell, Managing Gigabytes: Compressing and Indexing Documents and Images, San Francisco, CA: Morgan Kaufmann, 1999, Chapter 6, pp. 263-311.
Adolf Knoll et al., “Compression of Bi-Level Images”, National Library of Czech Republic, Prague, pp. 1-18, 2000.

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