Invention Grant
US07924465B2 Dither matrix, image processing method, storage medium, image processing apparatus, image forming apparatus, and image forming system
有权
抖动矩阵，图像处理方法，存储介质，图像处理装置，图像形成装置和图像形成系统
- Patent Title: Dither matrix, image processing method, storage medium, image processing apparatus, image forming apparatus, and image forming system
- Patent Title (中): 抖动矩阵，图像处理方法，存储介质，图像处理装置，图像形成装置和图像形成系统
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Application No.: US11794286Application Date: 2006-11-01
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Publication No.: US07924465B2Publication Date: 2011-04-12
- Inventor: Takahiro Ike , Masakazu Yoshida , Takashi Kimura , Masanori Hirano , Shigetoshi Hosaka
- Applicant: Takahiro Ike , Masakazu Yoshida , Takashi Kimura , Masanori Hirano , Shigetoshi Hosaka
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd.
- Current Assignee: Ricoh Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Cooper & Dunham LLP
- Priority: JP2005-318669 20051101; JP2006-279108 20061012
- International Application: PCT/JP2006/322325 WO 20061101
- International Announcement: WO2007/052832 WO 20070510
- Main IPC: H04N1/40
- IPC: H04N1/40 ; H04N1/405 ; G06K15/00
Abstract:
A disclosed dither matrix is used in halftone processing for converting input image data having M input halftone levels into output image data having N (M>N>2) output halftone levels. In the halftone processing, a concentration type dither matrix is used as the dither matrix when an input halftone level is within a range of input halftone levels corresponding to an output halftone level that is lower than a predetermined threshold level T (N>T>1), and a dispersion type dither matrix is used as the dither matrix when the input halftone level is within a range of input halftone levels corresponding to an output halftone level that is equal to or higher than the predetermined threshold level T.
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