Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-11-30
1999-06-29
O'Shea, Sandra L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
G06K 934
Patent
active
059176148
ABSTRACT:
In an error diffusion halftone screen generation system, improved image smoothness in the highlight and shadow areas is obtained by calculating the distance to the nearest previously generated output dot. The square of the distance to the nearest previously generated dot is used as a bias value to effectively modulate the error diffusion threshold. The resulting output provides a halftone with a more uniform texture in the highlight and shadow areas of the screened image. The resulting pattern resembles the pattern of dots produced by tightly packing imaginary circles in the image plane, and placing an output dot at the center of each such tightly packed imaginary circle.
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patent: 5243443 (1993-09-01), Eschbach
Floyd, R.W. and L. Steinberg, "An Adaptive Algorithm for Spatial Grayscale", Proc. SID, vol. 17/2, pp. 75-77.
"Recent Progress in Digital Halftoning", Carrara, D. A., M. Analoui, and J.P. Allebach, Proc. IS & T Eighth International Congress on Advances in Non-Impact Printing Technologies, pp. 265-270, Oct. 92.
"Analysis of Threshold Modulation in Error Diffusion," Knox, T. and R. Eschbach, Proc. IS & T Eighth International Congresson Advances in Non-Impact Printing Technologies, pp. 280-282 Oct. 92.
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Jacobson Allan
O'Shea Sandra L.
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