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  • parallel structure-aware halftoning

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 996
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     structure-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.

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