Dl. Neuhoff et al., ONE-DIMENSIONAL LEAST-SQUARES MODEL-BASED HALF-TONING, Journal of the Optical Society of America. A, Optics, image science,and vision., 14(8), 1997, pp. 1707-1723
A least-squares model-based approach to digital halftoning is proposed
. It exploits both a printer model and a model of visual perception. I
t produces a halftoned image that minimizes the squared error between
the response of the visual model to the original image and the respons
e of the printer and visual models to the halftoned image. For one-dim
ensional halftoning, in which each column is processed independently,
it is shown that least-squares halftoning can be optimally performed w
ith the Viterbi algorithm. Applying this approach to simple visual and
printer models yields better halftones than do conventional one-dimen
sional methods. Although one-dimensional halftoning is seldom used in
practice, the results of this method are of interest because their app
earance is due only to the models and the fundamental nature of halfto
ning. Thus they can serve as a guide to the design of two-dimensional
approaches for which only approximate least-squares solutions are poss
ible. (C) 1997 Optical Society of America.