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Proceedings Paper

Perceptual notion of scale for halftone representations: nonlinear diffusion
Author(s): Wei Qian; Benjamin B. Kimia
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Paper Abstract

It has been shown that incorporating a model of human visual system in the form of filtering halftone errors by the eye's Modulation Transfer Function improves the quality of generated halftones. However, in addition to the effect induced by the blurring of the eye, the human visual system constructs abstract, multi-scale representations of the images it perceives in the form of a coarse-fine representation where the coarser levels are augmented by increasingly finer levels of detail. Such abstract representations can be quite different from coarser representation generated by a linear Gaussian convolution filter which blurs the image while removing small features. In this paper we employ a nonlinear system of partial differential equations to construct a perceptually meaningful scale-space of coarse to fine representations of an image and require that the multi-scale structure of a halftone to approximate that of the original image. This is implemented via a scale-based error metric and optimization by simulate annealing. The improvements are demonstrated on a few images.

Paper Details

Date Published: 17 July 1998
PDF: 9 pages
Proc. SPIE 3299, Human Vision and Electronic Imaging III, (17 July 1998); doi: 10.1117/12.320139
Show Author Affiliations
Wei Qian, Brown Univ. (United States)
Benjamin B. Kimia, Brown Univ. (United States)


Published in SPIE Proceedings Vol. 3299:
Human Vision and Electronic Imaging III
Bernice E. Rogowitz; Thrasyvoulos N. Pappas, Editor(s)

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