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Proceedings Paper

Improved digital multitoning with overmodulation scheme
Author(s): Qing Yu; Kevin J. Parker; Kevin E. Spaulding; Rodney L. Miller
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Paper Abstract

Multilevel halftoning (multitoning) is an extension of bitonal halftoning, in which the appearance of intermediate tones is created by the spatial modulation of more than two tones, i.e., black, white, and one or more shades of gray. In this paper, a conventional multitoning approach and a specific approach, both using stochastic screen dithering, are investigated. Typically, a human visual model is employed to measure the perceived halftone error for both algorithms. We compare the performance of each algorithm at gray levels near the intermediate printer output levels. Based on this study, an over-modulation algorithm is proposed. This algorithm requires little additional computation and the halftone output is mean-preserving with respect to the input. We will show that, with this simple over-modulation scheme, we will be able to manipulate the dot patterns around the intermediate output levels to achieve desired halftone patterns. Investigation on optimal output level selection and inkjet printing simulation for this new scheme will also be reported.

Paper Details

Date Published: 2 January 1998
PDF: 12 pages
Proc. SPIE 3300, Color Imaging: Device-Independent Color, Color Hardcopy, and Graphic Arts III, (2 January 1998); doi: 10.1117/12.298299
Show Author Affiliations
Qing Yu, Univ. of Rochester (United States)
Kevin J. Parker, Univ. of Rochester (United States)
Kevin E. Spaulding, Eastman Kodak Co. (United States)
Rodney L. Miller, Eastman Kodak Co. (United States)


Published in SPIE Proceedings Vol. 3300:
Color Imaging: Device-Independent Color, Color Hardcopy, and Graphic Arts III
Giordano B. Beretta; Reiner Eschbach, Editor(s)

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