Digital halftoning of a continuous tone image using error diffus

Details Digital halftoning of a continuous tone image using error diffus Digital halftoning of a continuous tone image using error diffus

1996-02-06

1999-08-17

Lee, Thomas D.

Image analysis

Image compression or coding

Quantization

382237, G06T 500

Patent

active

059405414

ABSTRACT:
The present invention provides a method and apparatus for error diffusing a series of images, each of said images being made up of component pixels. The method comprises, for each of said pixels determining a current error diffused value for said pixel; adding an error margin to each current error diffused value to produce a marginalised error diffused value, said marginalised error diffused value being a translation of said current error diffused value in a direction towards that of a previous output value for said pixel; utilising said marginalised error diffused value to determine a closest possible output value to said marginalised error diffused value; and error diffusing the difference between said closest possible output value and said error diffused value to adjacent pixels.

REFERENCES:
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patent: 5113455 (1992-05-01), Scott
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patent: 5416613 (1995-05-01), Rolleston et al.
patent: 5570461 (1996-10-01), Yokomizo
"An Adaptive Algorithm For Spatial Gray Scale", R. Floyd et al., Society For Information Display 1975 Symposium Digest of Technical Papers, 1975, pp. 36-37.
"Digital Halftoning", R. Ulichney, 1991, MIT Press.
"Color Image Quantization For Frame Buffer Display", P. Heckbert, Computer Graphics, vol. 16, No. 3, Jul. 1982, pp. 297-304.
IBM Technical Disclosure Bulletin, vol. 29, No. 3, Aug. 1986, pp. 1329-1334 .

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