Method and apparatus for error diffusion screening of images wit

Details Method and apparatus for error diffusion screening of images wit Method and apparatus for error diffusion screening of images wit

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.

REFERENCES:
patent: 5055942 (1991-10-01), Levien
patent: 5208684 (1993-05-01), Itoh
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.
"A Collision-based Model of Spiral Phyllotaxis", Fowler, D., P. Prusinkiewicz and J. Battjes, Siggraph '92 Conf. Proc, pp. 361-368 Jul. 92 .

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