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Proceedings Paper

Frequency Analysis of Ordered Dither
Author(s): Robert A. Ulichney
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Paper Abstract

Ordered dither, the class of digital halftoning techniques which uses a periodic array of thresholds, is generalized for both rectangular and hexagonal grids, by means of the spatial method of recursive tessellation, a sub-tiling algorithm. The nature of the texture patterns so produced is illustrated and examined in the frequency domain, revealing several insights within and between the classes of rectangular and hexagonal grids. A simple explicit expression is derived which allows the use of the rectangular DFT to compute a hexagonal Fourier transform, maintaining continuous-space dimensions. Digitally produced examples are included.

Paper Details

Date Published: 6 July 1989
PDF: 13 pages
Proc. SPIE 1079, Hard Copy Output, (6 July 1989); doi: 10.1117/12.952821
Show Author Affiliations
Robert A. Ulichney, Digital Equipment Corporation (United States)

Published in SPIE Proceedings Vol. 1079:
Hard Copy Output
Leo Beiser; Stephen L. Corsover; John M. Fleischer; Vsevolod S. Mihajlov; Ken-Ichi Shimazu, Editor(s)

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