Device state error diffusion technique for halftoning

Details Device state error diffusion technique for halftoning Device state error diffusion technique for halftoning

1997-10-30

2000-06-27

Nguyen, Madeleine Ahn-Vinh

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 116, G06F 1500

Patent

active

06081344&

ABSTRACT:
A halftoning technique is disclosed which uses look-up tables to identify a combination of color ink drops (device states) to be printed by an inkjet printer. The look-up tables are indexed by a particular color to be reproduced. An error is also output by the look-up tables reflecting the difference between the indexing tone level and the printed color spot. The error is applied in a halftoning process to neighboring pixels. A plurality of look-up tables is used, and one of the look-up tables is selected for a particular medium (e.g., glossy paper, plain paper) to be printed upon. In this manner, the number and combination of ink drops can be optimize for a particular type of medium. In one embodiment, six different color inks are used by the printer.

REFERENCES:
patent: 5375002 (1994-12-01), Kim et al.
patent: 5381246 (1995-01-01), Suzuki et al.
patent: 5508826 (1996-04-01), Lloyd et al.
patent: 5717839 (1998-02-01), Ichikawa
patent: 5742405 (1998-04-01), Spaulding et al.
patent: 5799136 (1998-08-01), Li et al.

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