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Journal of Electronic Imaging

Tone-dependent noise model for high-quality halftones
Author(s): Yik-Hing Fung; Yuk-Hee Chan
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Paper Abstract

A digital halftone of blue noise characteristics is preferred as dots in the halftone of a constant input should be isotropically and homogeneously distributed. In practice, the placement of dots is constrained by a sampling grid and hence aliasing happens when the input gray level is in the middle range. To solve this problem, Lau et al. suggested replacing isolated dots by dot clusters to maintain the principal frequency of the output to be 1/2 when this happens. However, this model does not take into account that due to the stochastic nature of the dot distribution there is a considerable amount of energy distributed around the principal frequency and it causes aliasing problems even when the principal frequency of the output is 1/2 . Here, we present a new noise model that takes this factor into account. A halftoning algorithm is then proposed to generate halftones that satisfy the new noise model. By comparing its performance with that of some other algorithms that are proposed based on the traditional blue noise model and Lau et al.’s noise model, one can see that the proposed noise model can be a better model to describe the noise characteristics of a high-quality halftone.

Paper Details

Date Published: 12 April 2013
PDF: 17 pages
J. Electron. Imag. 22(2) 023004 doi: 10.1117/1.JEI.22.2.023004
Published in: Journal of Electronic Imaging Volume 22, Issue 2
Show Author Affiliations
Yik-Hing Fung, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Yuk-Hee Chan, The Hong Kong Polytechnic Univ. (Hong Kong, China)

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