Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2005-09-20
2008-12-23
Zimmerman, Mark K (Department: 2625)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S003010, C358S003030, C358S003050, C358S003130, C358S003170
Reexamination Certificate
active
07468814
ABSTRACT:
An algorithm for modulating printer half-tone screening based on the tonal values of the region being reproduced is provided. The algorithm determines the tonal values for a particular region and assigns real number constants to that region. As the clustering screen is applied, the threshold values in the clustering screen are reduced (divided) by the real number constants thereby modulating the effect of the application of the clustering screen. For deep tonal regions, the clustering screen is applied at full strength, while in light tonal regions no clustering effect is applied. The algorithm results in a an image that has a greater dynamic range without the appearance of stair stepping while eliminating clustering artifacts from the lighter regions.
REFERENCES:
patent: 5150429 (1992-09-01), Miller et al.
patent: 5309526 (1994-05-01), Pappas et al.
patent: 5313287 (1994-05-01), Barton
patent: 5444551 (1995-08-01), Miller et al.
patent: 5493416 (1996-02-01), Fan
patent: 5548407 (1996-08-01), von Kienlin et al.
patent: 5557709 (1996-09-01), Shu
patent: 5592592 (1997-01-01), Shu
patent: 5740279 (1998-04-01), Wang et al.
patent: 5768425 (1998-06-01), Praveen et al.
patent: 5818971 (1998-10-01), Moolenaar et al.
patent: 5831626 (1998-11-01), Sano et al.
patent: 5855433 (1999-01-01), Velho et al.
patent: 5901275 (1999-05-01), Broddin et al.
patent: 5917994 (1999-06-01), Perumal, Jr. et al.
patent: 6088512 (2000-07-01), Ancin et al.
patent: 6141121 (2000-10-01), Chen et al.
patent: 6266079 (2001-07-01), Gershony et al.
patent: 6266157 (2001-07-01), Fan et al.
patent: 6307978 (2001-10-01), Metaxas
patent: 6346993 (2002-02-01), Curry
patent: 6496603 (2002-12-01), Chang
patent: 6505905 (2003-01-01), Krouss
patent: 6753978 (2004-06-01), Chang
patent: 6763144 (2004-07-01), Gershony
patent: 6778299 (2004-08-01), Lin et al.
patent: 6791718 (2004-09-01), Allebach et al.
patent: 6801337 (2004-10-01), Bhaskar et al.
patent: 6813044 (2004-11-01), Rylander
patent: 6937365 (2005-08-01), Gorian et al.
patent: 7345792 (2008-03-01), Fan
patent: 2002/0089708 (2002-07-01), Cheng et al.
patent: 2003/0133160 (2003-07-01), Sharma et al.
patent: 2004/0017579 (2004-01-01), Lin
patent: 2004/0051906 (2004-03-01), Engbrocks et al.
patent: 2004/0090654 (2004-05-01), Minnebo et al.
patent: 2004/0119994 (2004-06-01), Minnebo et al.
patent: 2006/0077489 (2006-04-01), Zhang et al.
patent: 418844 (1991-03-01), None
patent: 880275 (1998-11-01), None
P. Li and J. P. Allebach, “Clustered-minority-pixel error diffusion”, Jul. 2004, Journal Optical Society of America, vol. 21, No. 7, pp. 1148-1160.
Knox, “Printing with Error Diffusion”, Recent Progress in Digital Halftoning, Xerox Corp., Webster, NY, pp. 1-5, 1994.
Fan, “Halftoning by Combining Ordered Dithering and Error Diffusion”, 1992 Recent Progress in Digital Halftoning, Xerox Corp., Webster, NY pp. 153-155.
Mitchell, et al, “Multilevel Color Halftoning”IBM Research Rept., RC22274 (W0112-018), Dec. 4, 2001, Computer Science.
Vaidyanathan, “Optimized halftoning using dot diffusion and methods for inversehalftoning”, IEEE Xplore Release 2.1, Apr. 2000, vol. 9, Issue 4, pp. 691-709.
Astro-Med Inc.
Barlow Josephs & Holmes
Cato Miya J
Zimmerman Mark K
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