Image processing apparatus, method, computer program...

Details Image processing apparatus, method, computer program... Image processing apparatus, method, computer program...

2008-11-20

2011-10-25

Rogers, Scott A (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003060, C358S462000

Reexamination Certificate

active

08045230

ABSTRACT:
A halftone pixel detection unit detects pixels near center pixels of halftone pixels by comparing a density difference between a target pixel and each of neighboring pixels of image data with a predetermined threshold. A halftone pixel rearranging unit rearranges the halftone pixels detected by the halftone pixel detection unit relative to the target pixel and a halftone-area detection unit detects a halftone area based upon a pattern of the halftone pixels that is rearranged.

REFERENCES:
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patent: 6661535 (2003-12-01), Fujimura et al.
patent: 7136194 (2006-11-01), Akahori et al.
patent: 7518755 (2009-04-01), Gotoh et al.
patent: 2010/0092092 (2010-04-01), Sakaue
patent: 2002-290719 (2002-10-01), None
patent: 3983101 (2007-07-01), None

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