Halftoning with error feedback and image dependent enhancement

Details Halftoning with error feedback and image dependent enhancement Halftoning with error feedback and image dependent enhancement

1991-12-06

1993-09-07

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358456, 358465, 358466, H04N 140

Patent

active

052434435

ABSTRACT:
A method and arrangement for quantizing gray level pixels using a combination of halftoning and error diffusion which initially determines a best fit halftone cell, and propagates halftoning error in order to maintain gray density, while reducing halftoning and error diffusion artifacts.

REFERENCES:
patent: 4051536 (1977-09-01), Roetling
patent: 4149194 (1979-04-01), Holladay
patent: 4339774 (1982-07-01), Temple
patent: 4633327 (1986-12-01), Roetling
patent: 4654721 (1987-03-01), Goertzel et al.
patent: 4924322 (1990-05-01), Kurosawa et al.
patent: 4955065 (1990-09-01), Ulichney
patent: 5045952 (1991-09-01), Eschbach
patent: 5130819 (1992-07-01), Ohta
An Adaptive Algorithm for Sptaial Greyscale, Floyd and Steinberg, Proceedings of the SID, 17/2, 75-77 (1976).
A Survey of Techniques for the Display of Continuous Tone Pictures on Bilevel Displays, Jarvis et al., Computer Graphics and Image Processing, vol. 5, pp. 13-40 (1976).
MEECCA-A Multiple-Error Correction Computation Algorithm for Bi-Level Image Hardcopy Reproduction, Stucki, IBM Research RZ1060 (1981).
On the Error Diffusion Technique for Electronic Halftoning, Billotet-Hoffmann et al., Proceedings of the SID, vol. 24/3 pp. 253-258 (1983).
Digital Halftoning on the IBM 4250 Printer, Goertzel et al., IBM J Res Develop, vol. 31, No. 1, Jan. 1987, pp. 2-15.
"Images from Computers", M. Schroeder, IEEE Spectrum, Mar. 1969, pp. 66-78.
"Halftone Method With Edge Enhancement and Moire Suppression", P. G. Roetling, J. Opt. Soc. Amer., vol. 66, No. 10, Oct. 1976, pp. 985-989.

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