Title:
DOT THRESHOLD SETTING METHOD AND BINARY DATA GENERATION DEVICE
Document Type and Number:
Japanese Patent JP3917200
Kind Code:
B2
Abstract:
PURPOSE: To prevent occurrence of the moire fringes by deciding alternately the threshold value which are allocated to the pixels included in dot cells of the shadow point centers.
CONSTITUTION: A supercell is divided into dot cells Hh of the highlight point centers and also into the dot cells Hs of the shadow point centers. The threshold value 0, 1, 2, 3... which are allocated to the pixels included in cells Hh of the highlight point centers and the threshold value N, N-1, N-2, N-3... which are allocated to the pixels included in cells Hs of the shadow point centers are alternately decided (in order of 0→N→1→N-1→...→3→N-3). As a result, the number of blackened pixels included in the cells Hh is equal to the number of white-on-black pixels included in the cells Hs in terms of every dot cell included in the supercell S when an original image has high density. Thus it is possible to prevent the moire fringes that are caused by the periodical changes of the number of blackened pixels included in the dot cells.
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Inventors:
Yoshiaki Inoue
Application Number:
JP12392295A
Publication Date:
May 23, 2007
Filing Date:
May 23, 1995
Export Citation:
Assignee:
FUJIFILM Corporation
International Classes:
G03F5/00; H04N1/405; G06T3/00; (IPC1-7): H04N1/405; G03F5/00; G06T3/00
Domestic Patent References:
| JP287772A |
Other References:
ピーター・フィンク、ポストスクリプト・スクリーニング デジタル印刷の網点生成技術、株式会社エムディエヌコーポレーション、1994年8月11日初版第1刷発行、97-103頁、第7章 スーパーセルの概略
Attorney, Agent or Firm:
Takehiro Chiba
Toshiyuki Miyadera
Naoki Kashima
Yasuo Takubo
Toshiyuki Miyadera
Naoki Kashima
Yasuo Takubo