Title:
画像形成装置及びカラー画像形成装置
Document Type and Number:
Japanese Patent JP4607989
Kind Code:
B2
Abstract:
A halftone processing section halftone-processes input image data using a plurality of dither threshold planes. An image output section having different output position accuracies between a main scan direction and a sub-scan direction outputs an image corresponding to halftone-processed image data. Each of the dither threshold planes consists of a plurality of the same unit threshold matrixes. In the unit threshold matrix, a relatively medium to high threshold array in a predetermined threshold range corresponding to the entire tone range of the input image data is an aperiodic array and an anisotropic array with neighboring thresholds having close values, in a direction coincident with a scan direction, in which the output position accuracy of the image output means is low. With this configuration, the image output section outputs an image having serial medium and high tone dots in the scan direction.
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Inventors:
Nobuhiko Nakahara
Hiroki Umezawa
Hiroki Umezawa
Application Number:
JP2008193863A
Publication Date:
January 05, 2011
Filing Date:
July 28, 2008
Export Citation:
Assignee:
TOSHIBA TEC CORPORATION
International Classes:
H04N1/405; B41J2/52; G06F15/00; G06K9/00; G06K15/00; G06T5/00; H04N1/40; H04N1/52; H04N1/60
Domestic Patent References:
| JP10191054A | ||||
| JP8307720A | ||||
| JP6217116A | ||||
| JP7143338A | ||||
| JP7274015A | ||||
| JP63308473A |
Attorney, Agent or Firm:
Kurata Masatoshi
Satoshi Kono
Makoto Nakamura
Yoshihiro Fukuhara
Takashi Mine
Toshio Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Kocho Chojiro
Naoki Kono
Katsu Sunagawa
Katsumura Hiro
Tatsushi Sato
Takashi Okada
Mihoko Horiuchi
Takenori Masanori
Takuzo Ichihara
Yamashita Gen
Satoshi Kono
Makoto Nakamura
Yoshihiro Fukuhara
Takashi Mine
Toshio Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Kocho Chojiro
Naoki Kono
Katsu Sunagawa
Katsumura Hiro
Tatsushi Sato
Takashi Okada
Mihoko Horiuchi
Takenori Masanori
Takuzo Ichihara
Yamashita Gen