Design of tone-dependent color-error diffusion halftoning systems. |
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Authors: | Vishal Monga Niranjan Damera-Venkata Brian L Evans |
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Affiliation: | Xerox Wilson Research Center, Webster, NY 14580, USA. vishal.monga@xeroxlabs.com |
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Abstract: | Grayscale error diffusion introduces nonlinear distortion (directional artifacts and false textures), linear distortion (sharpening), and additive noise. Tone-dependent error diffusion (TDED) reduces these artifacts by controlling the diffusion of quantization errors based on the input graylevel. We present an extension of TDED to color. In color-error diffusion, which color to render becomes a major concern in addition to finding optimal dot patterns. We propose a visually meaningful scheme to train input-level (or tone-) dependent color-error filters. Our design approach employs a Neugebauer printer model and a color human visual system model that takes into account spatial considerations in color reproduction. The resulting halftones overcome several traditional error-diffusion artifacts and achieve significantly greater accuracy in color rendition. |
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