System and methods for compensating for streaks in images

Details System and methods for compensating for streaks in images System and methods for compensating for streaks in images

2006-08-15

2006-08-15

Feggins, K. (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

Reexamination Certificate

active

07090324

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 alignment marks before and after a halftone compensation region. The alignment marks provide alignment between the printer pixel grid and a scanning pixel grid. The line width of each alignment mark and 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 line widths of the alignment marks can be remeasured to adjust the local tone reproduction curves to compensate for the streak defect when printing.

REFERENCES:
patent: 4553033 (1985-11-01), Hubble, III et al.
patent: 6819352 (2004-11-01), Mizes et al.
patent: 2002/0075379 (2002-06-01), Klassen et al.
patent: 2005/0099446 (2005-05-01), Mizes et al.

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