Title:
画像処理方法及び画像処理装置
Document Type and Number:
Japanese Patent JP4116265
Kind Code:
B2
Abstract:
An image data of M-gradations in a pixel is converted into multivalued image data of N-gradations (M > N > 2) in a pixel. A remarked pixel converted into the multivalued data is determined whether to be a predetermined gradation TJ (N > TJ > 2) in which a tone jump occurs. When the remarked pixel converted into the multivalued data is determined to be the predetermined gradation TJ, it is determined whether a pixel of the predetermined gradation TJ exists in pixels being adjacent to the remarked pixel. When the pixel of the predetermined gradation exists, the gradation of the remarked pixel is changed to the gradation other than the predetermined gradation so as to prevent the tone jump, and an average density after multivalued image data conversion is preserved.
Inventors:
Yuko Nagata
Hidehiro Watanabe
Hidehiro Watanabe
Application Number:
JP2001146715A
Publication Date:
July 09, 2008
Filing Date:
May 16, 2001
Export Citation:
Assignee:
TOSHIBA TEC CORPORATION
International Classes:
B41J2/01; H04N1/405; B41J2/52; G03F3/08; G06T5/00
Domestic Patent References:
| JP2000333007A | ||||
| JP2000022951A |
Attorney, Agent or Firm:
Takehiko Suzue
Sadao Muramatsu
Ryo Hashimoto
Satoshi Kono
Makoto Nakamura
Shoji Kawai
Sadao Muramatsu
Ryo Hashimoto
Satoshi Kono
Makoto Nakamura
Shoji Kawai