Method for enhancing print quality of halftone images

Details Method for enhancing print quality of halftone images Method for enhancing print quality of halftone images

2005-01-11

2009-06-02

Lee, Thomas D (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S001900, C358S003270, C382S252000, C382S266000

Reexamination Certificate

active

07542170

ABSTRACT:
A method for enhancing the print quality of halftone images makes use of error diffusion to perform halftone image processing to a document. After an RGB image is obtained by scanning the document, a high-pass filter is used to detect the edge characteristics and edge directions of the RGB image. Next, during the error diffusion process, a condition quantizer is used to separately process pixels both with and without edge characteristics based on the edge characteristics, gray scale values, and accumulated errors of input pixels. Pixels without edge characteristics can thus have a smoother distribution by means of error diffusion, and the pixels with edge characteristics can have a concentrated distribution, thereby the edge of the text in the document can be sharpened.

REFERENCES:
patent: 5068746 (1991-11-01), Ohsawa et al.
patent: 6026199 (2000-02-01), Sommer
patent: 6041139 (2000-03-01), Okubo et al.
patent: 6977757 (2005-12-01), Takahashi et al.
patent: 2004/0190071 (2004-09-01), Thakur

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