Abstract
Digital image halftoning is a widely used technique. However, achieving high fidelity tone reproduction and structural preservation with low computational time cost remains a challenging problem. This paper presents a highly parallel algorithm to boost real-time application of serial structure-preserving error diffusion. The contrast-aware halftoning approach is one such technique with superior structure preservation, but it offers only a limited opportunity for graphics processing unit (GPU) acceleration. Our method integrates contrast-aware halftoning into a new parallelizable error-diffusion halftoning framework. To eliminate visually disturbing artifacts resulting from parallelization, we propose a novel multiple quantization model and space-filling curve to maintain tone consistency, blue-noise property, and structure consistency. Our GPU implementation on a commodity personal computer achieves a real-time performance for a moderately sized image. We demonstrate the high quality and performance of the proposed approach with a variety of examples, and provide comparisons with state-of-the-art methods.
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Project supported by the National Key Technology R&D Program of China (No. 2012BAH35B03), the National High-Tech R&D Program of China (No. 2012AA12090), the National Natural Science Foundation of China (Nos. 61232012 and 81172124), and the Zhejiang Provincial Natural Science Foundation (No. LY13F020002)
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Liu, Ly., Chen, W., Wong, Tt. et al. An improved parallel contrast-aware halftoning. J. Zhejiang Univ. - Sci. C 14, 918–929 (2013). https://doi.org/10.1631/jzus.C1300142
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DOI: https://doi.org/10.1631/jzus.C1300142