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Proceedings Paper

Spectral constraints and their realization in image quantization
Author(s): Thomas Scheermesser; Manfred Broja; Olof Bryngdahl
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Paper Abstract

The quantization of a graytone image results in the introduction of quantization noise. To influence the characteristics of the image, different types of constraints can be forced on the noise spectrum. These constraints may be used to adapt the image characteristics to a processing system or to the characteristics of the graytone image. Amplitude and phase can be controlled in different regions in the spectrum during the quantization, allowing an enhancement of details in the image. Moreover, it is of advantage to use oversampled spectra during the quantization, taking the fact into account that the finally printed or displayed image possesses a continuous spectrum. However, the realization of these spectral constraints is limited by two different mechanisms. An analysis of these mechanisms leads to a set of linear and a set of nonlinear equations. The restrictions they impose must be considered when choosing specific spectral constraints.

Paper Details

Date Published: 18 June 1993
PDF: 4 pages
Proc. SPIE 1912, Color Hard Copy and Graphic Arts II, (18 June 1993); doi: 10.1117/12.146289
Show Author Affiliations
Thomas Scheermesser, Univ. of Essen (Germany)
Manfred Broja, Univ. of Essen (Germany)
Olof Bryngdahl, Univ. of Essen (Germany)

Published in SPIE Proceedings Vol. 1912:
Color Hard Copy and Graphic Arts II
Jan Bares, Editor(s)

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