Geometrically reducing mask error diffusion

Details Geometrically reducing mask error diffusion Geometrically reducing mask error diffusion

1997-01-06

2000-08-22

Lee, Thomas D.

Image analysis

Image compression or coding

Quantization

358448, 358456, G06K 946

Patent

active

061084522

ABSTRACT:
An image processing system in which a computer image is halftoned by halftoning a current pixel using error diffusion, with a halftoned output value of the current pixel being determined using errors derived from substantially all previously halftoned pixels of the image. Output error values are determined for each pixel, and are acted upon by an error diffusion mask of geometrically reducing values. In certain instances, previously halftoned pixels are divided into two or more groups to obtain a desired contribution from previously halftoned pixels.

REFERENCES:
patent: 4339774 (1982-07-01), Temple
patent: 5353127 (1994-10-01), Shiau et al.
"Halftoning Techniques Using Error Correction", G.S. Fawcett et al., Proceedings of the Society for Information Display (SID), vol. 27, No. 4, 1986, New York (US), pp. 305-308, XP000002353.
"An adaptive algorithm for Spatial Greyscale" R.W. Floyd et al., Society for Information Display 1975, Symposium Digest of Technical Papers, 1975, pp. 75-77.
"Digital Halftoning", Robert Ulichney, MIT Press, 1991.

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