Error diffusion pattern shifting reduction through programmable

Details Error diffusion pattern shifting reduction through programmable Error diffusion pattern shifting reduction through programmable

1996-10-10

1999-03-09

Moore, David K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358465, G06K 900

Patent

active

058808574

ABSTRACT:
A process eliminates pattern shifting artifacts in a printed image by perturbing a threshold/image signal value relationship when a multi-level grey level is binarized. The process utilizes a programmable multi-level grey signal modifying circuit for modifying the multi-level grey signal by a predetermined value according to its grey level. The modified multi-level grey signal is binarized to a binary pixel signal according to a relationship between the modified multi-level grey signal and a threshold value. The process further generates an error corresponding to the relationship and diffuses the error to neighboring pixels. The multi-level grey signal is modified with either random noise multiplied by a grey level dependent coefficient or by a predetermined value from a checkerboard or vertical line pattern. The value from the pattern is dependent upon the grey level and pixel location of the image data.

REFERENCES:
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patent: 5506699 (1996-04-01), Wong
patent: 5530561 (1996-06-01), Shimazaki
Billotet-Hoffmann et al., "On The Error Diffusion Technique For Electronic Halftoning", vol. 24, No. 3, 1983, pp. 253-258.
H. Kotera et al., "A Poster-Size Color Ink-Jet Printing System", vol. 25, No. 4, 1984, pp. 321-329.

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