From Sigma-Delta Modulation to Digital Halftoning of Images

@inproceedings{tmb_icassp91,
    author  = "Bernard, T. ",
    title   = "From Sigma-Delta Modulation to Digital Halftoning of Images",
  booktitle = "Proc. IEEE Int. Conf. on Acoustics, Speech and Signal Processing",
    address = "Toronto, Ontario",
    pages   = "2805-2808",
    month   = may,
    year    = 1991
}

Abstract
The bilevel rendition of continuous tone pictures, referred to as the halftoning problem, is likely to play an important role within the smart sensor paradigm. Mainly concerned with implementation constraints, we have designed a novel parallel halftoning technique, apparently outperforming usual error diffusion based methods. In this paper, we present our technique as an analytical 2-D extension of sigma-delta modulation, which is proven to feature optimal characteristics for the halftoning problem. A particular effort is devoted to transform the sequential expression of sigma-delta modulation into a parallel and dimension independent expression. This allows a precise understanding of the halftoning action in the frequential domain, while explaining the good experimental performance of our method. It is finally argued that silicon appears as a most valuable source of inspiration.

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