Image forming apparatus and image processing method

Details Image forming apparatus and image processing method Image forming apparatus and image processing method

2007-12-11

2007-12-11

Luu, Matthew (Department: 2861)

Incremental printing of symbolic information

Ink jet

Controller

C358S001200, C358S001300, C358S001400, C358S001800, C358S001900, C358S502000, C347S019000, C347S043000

Reexamination Certificate

active

11384285

ABSTRACT:
The image forming apparatus forms an image on a prescribed recording medium by carrying out digital halftoning using a threshold value matrix. The image forming apparatus comprises: a plurality of nozzles which eject ink toward the recording medium to form an image; an ejection characteristics determination device which determines ejection characteristics of each of the nozzles; and a threshold value correction device which performs first threshold value correction to reduce density non-uniformity occurring in the image due to error in the ejection characteristics of the nozzles, by correcting the threshold value matrix according to the error in the ejection characteristics of the nozzles, and performs second threshold value correction to reduce granularity in the image by correcting the threshold value matrix having undergone the first threshold value correction, according to threshold values in the threshold value matrix.

REFERENCES:
patent: 5832122 (1998-11-01), Shimazaki
patent: 6390583 (2002-05-01), Kato et al.
patent: 2006/0193010 (2006-08-01), Kakutani
patent: 2000-307865 (2000-11-01), None
patent: 2004-168000 (2004-06-01), None
“Digital Halftoning,” R. Ulichney, The MIT Press, pp. 54-61 and pp. 236-239 (1987).

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