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Proceedings Paper

Digital halftoning methods for selectively partitioning error into achromatic and chromatic channels
Author(s): Jeffrey B. Mulligan
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Paper Abstract

A method is described for reducing the visibility of artifacts arising in the display of quantized color images on CRT displays. The method is based on the differential spatial sensitivity of the human visual system to chromatic and achromatic modulations. Because the visual system has the highest spatial and temporal acuity for the luminance component of an image, we seek a technique which will reduce luminance artifacts at the expense of introducing high-frequency chromatic errors. In this paper we explore a method based on controlling the correlations between the quantization errors in the individual phosphor images. The luminance component is greatest when the phosphor errors are positively correlated, and is minimized when the phosphor errors are negatively correlated. The greatest effect of the correlation is obtained when the intensity quantization step sizes of the individual phosphors have equal luminances. For the ordered dither algorithm, a version of the method can be implemented by simply inverting the matrix of thresholds for one of the color components.

Paper Details

Date Published: 1 October 1990
PDF: 10 pages
Proc. SPIE 1249, Human Vision and Electronic Imaging: Models, Methods, and Applications, (1 October 1990); doi: 10.1117/12.19676
Show Author Affiliations
Jeffrey B. Mulligan, NASA/Ames Research Ctr. (United States)


Published in SPIE Proceedings Vol. 1249:
Human Vision and Electronic Imaging: Models, Methods, and Applications
Bernice E. Rogowitz; Jan P. Allebach, Editor(s)

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