Parallel structure-aware halftoning
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AbstractStructure-aware halftoning technique is one of the state-of-the-art algorithms for generating structure-preserving bitonal images. However, the slow optimization process prohibits its real-time application. This is due to its high computational cost of similarity measurement and iterative refinement. Unfortunately, the structure-aware halftoning cannot be straightforwardly parallelized due to its data dependency nature. In this paper, we propose a parallel algorithm to boost the optimization of the structure-aware halftoning. Our main idea is to exploit the spatial independence during the evaluation of the objective function and temporal independence among the iterations. Specifically, we introduce a parallel Poisson-disk algorithm during the selection of pixel swaps, which guarantees the independency between parallel processes. Graphics processing unit (GPU) implementation of the technique leads to a significant speedup without sacrificing the quality. Our experiments demonstrate the effectiveness of the proposed parallel algorithm in generating structure-preserving bitonal images with much less time, especially for large images. © 2012 Springer Science+Business Media, LLC.
All Author(s) ListWu H., Wong T.-T., Heng P.-A.
Journal nameMultimedia Tools and Applications
Year2013
Month12
Day1
Volume Number67
Issue Number3
PublisherKluwer Academic Publishers
Place of PublicationNetherlands
Pages529 - 547
ISSN1380-7501
eISSN1573-7721
LanguagesEnglish-United Kingdom
KeywordsDigital halftoning, GPU, Parallel poisson-disk sampling, SSIM

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