James E Bean

US Patent:

7352903, Apr 1, 2008

Filed:

Nov 12, 2004

Appl. No.:

10/988434

Inventors:

William Douglas Withers - Crofton MD, US
John H. Elton - Atlanta GA, US
James R. Bean - Ballston Spa NY, US

Assignee:

Pegasus Imaging Corporation - Tampa FL

International Classification:

G06K 9/36

US Classification:

382232, 382240

Abstract:

Improved methods and apparatus for implementing JPEG 2000 MQ encoding operations are described. The following features of the invention may be used alone or in combination to implement JPEG 2000's coefficient bit modeling 1) Lists of coefficients to be processed in one or more subsequent coding passes are generated as coefficients are processed. The list is allows processing in the subsequent coding pass to be limited to coefficients on the list; and 2) Generation, updating and use of a neighborhood descriptor value table that stores a neighborhood descriptor value for each coefficient of a block being processed. The neighborhood descriptor values provide information about the state of the coefficient and its adjacent neighbors. Neighborhood descriptor values are used to access a lookup table that provides one or more context values and/or sign value to be used in MQ encoding. The neighborhood descriptor value corresponding to a coefficient and the neighborhood descriptor values corresponding to coefficients adjacent the coefficient are updated when the coefficient becomes significant, e. g.

US Patent:

20060039613, Feb 23, 2006

Filed:

Nov 12, 2004

Appl. No.:

10/988191

Inventors:

William Withers - Crofton MD, US
John Elton - Atlanta GA, US
James Bean - Ballston Spa NY, US

International Classification:

G06K 9/36

US Classification:

382232000

Abstract:

Improved methods and apparatus for implementing JPEG 2000 MQ encoding operations are described. The following features of the invention may be used alone or in combination to implement JPEG 2000's coefficient bit modeling 1) Lists of coefficients to be processed in one or more subsequent coding passes are generated as coefficients are processed. The list is allows processing in the subsequent coding pass to be limited to coefficients on the list; and 2) Generation, updating and use of a neighborhood descriptor value table that stores a neighborhood descriptor value for each coefficient of a block being processed. The neighborhood descriptor values provide information about the state of the coefficient and its adjacent neighbors. Neighborhood descriptor values are used to access a lookup table that provides one or more context values and/or sign value to be used in MQ encoding. The neighborhood descriptor value corresponding to a coefficient and the neighborhood descriptor values corresponding to coefficients adjacent the coefficient are updated when the coefficient becomes significant, e.g., a 1 is first encountered in the coefficient.

Author:

James R. Bean

ISBN #:

0683183451