Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Tsutomu Sakaue0
Date of Patent
August 23, 2011
0Patent Application Number
119972160
Date Filed
August 29, 2006
0Patent Primary Examiner
Patent abstract
When a halftone dot region includes a character or line drawing, high extraction performance of a halftone dot region cannot be obtained. Hence, the isolation amount of a pixel of interest is calculated, and the isolation amounts are integrated in a plurality of areas having different sizes. Thresholds set for respective areas are compared with the integration result to determine whether or not the pixel of interest belongs to a halftone dot region.
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