Method and apparatus for producing halftone images using green-noise masks having adjustable coarseness
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United States of America Patent
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Dec 10, 2002
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N/A
app pub date -
Jan 11, 1999
filing date -
Jan 16, 1998
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Abstract
A method and apparatus for producing halftone images which utilizes the advantageous stochastic patterning of dots found in frequency-modulated, blue-noise masks, and avoids the problem of dot gain provided in amplitude-modulated masks. Here a green-noise spectrum is used to generate a dither mask and the halftone patterns for each gray-level are subjected to the stacking constraint. The filters used in building the green-noise masks comprise filters using the conventional blue-noise mask for a coarseness parameter M'(g)=1 and filters having a principle frequency f.sub.g less than the principle frequency of blue-noise f.sub.b when coarseness parameter M'(g)>1. Unlike blue-noise dither patterns, green-noise dither patterns comprise pixel clusters, making them less susceptible to image degradation from dot gain, generating dot-profiles that are visually pleasing to the human eye.
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