Digital halftoning methods for selectively partitioning error into achromatic and chromatic channels

Jeffrey B. Mulligan

doi:10.1117/12.19676

1 October 1990 Digital halftoning methods for selectively partitioning error into achromatic and chromatic channels

Jeffrey B. Mulligan

Proceedings Volume 1249, Human Vision and Electronic Imaging: Models, Methods, and Applications; (1990) https://doi.org/10.1117/12.19676
Event: Electronic Imaging: Advanced Devices and Systems, 1990, Santa Clara, CA, United States

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.

Citation Download Citation

Jeffrey B. Mulligan "Digital halftoning methods for selectively partitioning error into achromatic and chromatic channels", Proc. SPIE 1249, Human Vision and Electronic Imaging: Models, Methods, and Applications, (1 October 1990); https://doi.org/10.1117/12.19676

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