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Tone-dependent noise model for high-quality halftones

[+] Author Affiliations
Yik-Hing Fung

The Hong Kong Polytechnic University, Center of Multimedia Signal Processing, Department of Electronic and Information Engineering, Hong Kong

Yuk-Hee Chan

The Hong Kong Polytechnic University, Center of Multimedia Signal Processing, Department of Electronic and Information Engineering, Hong Kong

J. Electron. Imaging. 22(2), 023004 (Apr 12, 2013). doi:10.1117/1.JEI.22.2.023004
History: Received November 21, 2012; Accepted March 6, 2013
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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.

© 2013 SPIE and IS&T

Citation

Yik-Hing Fung and Yuk-Hee Chan
"Tone-dependent noise model for high-quality halftones", J. Electron. Imaging. 22(2), 023004 (Apr 12, 2013). ; http://dx.doi.org/10.1117/1.JEI.22.2.023004


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Efficient halftoning based on multiple look-up tables. IEEE Trans Image Process 2013;22(11):4522-31.
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