Title:
画像におけるストリーク補償システム及び方法
Document Type and Number:
Japanese Patent JP4809601
Kind Code:
B2
Abstract:
Defects in an image forming system may give rise to visible streaks, or one-dimensional defects in an image that run parallel to the process direction. One known method for compensating for streaks introduces a separate tone reproduction curve for each pixel column in the process direction. A compensation pattern according to this invention has a plurality of halftone regions that are lead by, trained by, and separated by rows of fiducial marks. The fiducial marks allow the printer pixel grid and a scanning pixel grid to be correlated. The gray level in each pixel column of each gray level portion is measured and analyzed to produce a local tone reproduction curve for each pixel column and associated line width. The local tone reproduction curves are then used to compensate for the streak defect when printing.
Inventors:
Howard A. Mises
Robert M Ruffus
Robert M Ruffus
Application Number:
JP2004323069A
Publication Date:
November 09, 2011
Filing Date:
November 08, 2004
Export Citation:
Assignee:
XEROX CORPORATION
International Classes:
B41J29/46; G03G15/00; B41J29/393; H04N1/00
Domestic Patent References:
| JP6003911A | ||||
| JP2003182154A | ||||
| JP10000811A | ||||
| JP7314787A | ||||
| JP10250179A | ||||
| JP2001111823A |
Attorney, Agent or Firm:
Kenji Yoshida
Jun Ishida
Jun Ishida