Title:
画像処理装置、画像処理プログラムおよび記憶媒体
Document Type and Number:
Japanese Patent JP4118749
Kind Code:
B2
Abstract:
A character area is extracted from an original image, which is a digital image, according to a feature value calculated with respect to the original image. Pixels belonging to the extracted character area are classified into a first class and a second class according to colors, in each of blocks divided from the original image. A black character color and a ground color on the original image are estimated according to the classification of the pixels belonging to the extracted character area into the first and second classes. A tone correction is performed to the original image according to the estimated black character color and the estimated ground color so as to adjust a contrast of the black character and the ground in an output image.
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Inventors:
Hirofumi Nishida
Application Number:
JP2003163565A
Publication Date:
July 16, 2008
Filing Date:
June 09, 2003
Export Citation:
Assignee:
株式会社リコー
International Classes:
B41J21/00; G06F3/12; G06V30/162; G06T5/00; H04N1/407; H04N1/40; G06V30/10
Domestic Patent References:
| JP8307666A | ||||
| JP5316343A | ||||
| JP6339028A | ||||
| JP10232926A | ||||
| JP11136505A | ||||
| JP2002117400A | ||||
| JP2002118751A | ||||
| JP2000357226A | ||||
| JP2000048120A |
Attorney, Agent or Firm:
Tadahiko Ito