Halftone screen frequency and magnitude estimation for...

Details Halftone screen frequency and magnitude estimation for... Halftone screen frequency and magnitude estimation for...

2008-05-20

2008-05-20

Lamb, Twyler (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003200, C358S003260, C358S001900, C358S003060, C358S534000, C358S536000, C358S463000, C382S254000, C382S260000, C382S261000, C382S263000, C382S265000, C382S274000, C382S264000, C382S284000

Reexamination Certificate

active

10612084

ABSTRACT:
An efficient method and system for eliminating halftone screens from scanned documents while preserving the quality and sharpness of text and line-art is disclosed. The method and system utilizes one or more independent channels with different sensitivities (e.g., Max, High, and Low) to provide high quality frequency and magnitude estimation. The most sensitive channel (Max) derives the frequency estimate, and the remaining channels (e.g., High and Low) are combined to create the screen magnitude. The Max channel is the most sensitive and will usually report the existence of frequencies even when the screen is very weak. Therefore, the screen frequency must be additionally qualified by the screen magnitude. The screen magnitude can be interpreted as the level of confidence that the local neighborhood represents half-toned data.

REFERENCES:
patent: 4849914 (1989-07-01), Medioni et al.
patent: 5515452 (1996-05-01), Penkethman et al.
patent: 5583659 (1996-12-01), Lee et al.
patent: 5638134 (1997-06-01), Kameyama et al.
patent: 5745596 (1998-04-01), Jefferson
patent: 5900953 (1999-05-01), Bottou et al.
patent: 6058214 (2000-05-01), Bottou et al.
patent: 6091849 (2000-07-01), Spaulding et al.
patent: 6324305 (2001-11-01), Holladay et al.
patent: 6343154 (2002-01-01), Bottou et al.
patent: 6400844 (2002-06-01), Fan et al.
patent: 6549658 (2003-04-01), Schweid et al.
patent: 6633670 (2003-10-01), Matthews
patent: 6734991 (2004-05-01), Schweid
patent: 6859204 (2005-02-01), Curry et al.
patent: 6983076 (2006-01-01), Curry et al.
patent: 6987882 (2006-01-01), Curry et al.
patent: 7031518 (2006-04-01), Curry et al.
patent: 7200263 (2007-04-01), Curry et al.
patent: 7218418 (2007-05-01), Curry et al.
patent: 2003/0197878 (2003-10-01), Metois et al.
patent: 2005/0002064 (2005-01-01), Curry et al.
patent: 2005/0179948 (2005-08-01), Curry et al.
patent: 0 712 094 (1996-05-01), None
patent: 1 006 716 (2000-06-01), None
U.S. Appl. No. 10/776,515, filed Feb. 12, 2004, Curry et al.
U.S. Appl. No. 10/776,514, filed Feb. 12, 2004, Curry et al.
U.S. Appl. No. 10/776,608, filed Feb. 12, 2004, Curry et al.
U.S. Appl. No. 10/776,602, filed Feb. 12, 2004, Curry et al.
U.S. Appl. No. 10/776,620, filed Feb. 12, 2004, Curry et al.
U.S. Appl. No. 10/776,603, filed Feb. 12, 2004, Curry et al.
U.S. Appl. No. 10/776,509, filed Feb. 12, 2004, Claassen et al.
U.S. Appl. No. 10/776,508, filed Feb. 12, 2004, Curry et al.
U.S. Appl. No. 10/776,516, filed Feb. 12, 2004, Curry et al.
U.S. Appl. No. 10/776,612, filed Feb. 12, 2004, Curry et al.
U.S. Appl. No. 10/187,499, filed Jul. 2002, Donald J. Curry et al.
U.S. Appl. No. 10/188,026, filed Jul. 2002, Donald J. Curry et al.
U.S. Appl. No. 10/188,157, filed Jul. 2002, Donald J. Curry et al.
U.S. Appl. No. 10/188,249, filed Jul. 2002, Donald J. Curry et al.
U.S. Appl. No. 10/188,277, filed Jul. 2002, Donald J. Curry et al.
U.S. Appl. No. 10/612,057, filed Jul. 2003, Donald J. Curry et al.
U.S. Appl. No. 10/612,062, filed Jul. 2003, Donald J. Curry et al.
U.S. Appl. No. 10/612,063, filed Jul. 2003, Donald J. Curry et al.
U.S. Appl. No. 10/612,064, filed Jul. 2003, Donald J. Curry et al.
U.S. Appl. No. 10/612,234, filed Jul. 2003, Donald J. Curry et al.
U.S. Appl. No. 10/612,246, filed Jul. 2003, Donald J. Curry et al.
U.S. Appl. No. 10/612,248, filed Jul. 2003, Donald J. Curry et al.
U.S. Appl. No. 10/612,250, filed Jul. 2003, Donald J. Curry et al.
U.S. Appl. No. 10/612,368, filed Jul. 2003, Donald J. Curry et al.
U.S. Appl. No. 10/612,461, filed Jul. 2003, Donald J. Curry et al.
U.S. Appl. No. 10/612,261, filed Jul. 2003, Donald J. Curry et al.
R. De Queiroz, “Compression of Compound Documents,”IEEE, 1999.
Kite, T.D., et al. “A High Quality, Fast Inverse Halftoning Algorithm for Error Diffused Halftones.” Image Processing, 1998. ICIP 98. Proceedings. 1998 International Conference on Chicago, IL, USA, vol. 2, Oct. 4, 1998. pp. 59-63.
Ibaraki, H., et al. “New Image Processing Method for Halftone Pictures,” Electronics and Communications in Japan, Part I-Communications, Wiley, Hoboken, NJ, US, vol. 71, No. 7, Jul. 1, 1988. pp. 87-99.

Affiliated with

Also associated with

Rating

Halftone screen frequency and magnitude estimation for... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Halftone screen frequency and magnitude estimation for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Halftone screen frequency and magnitude estimation for... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3943330