Methods to print N-tone images with multi-leveling techniques

Details Methods to print N-tone images with multi-leveling techniques Methods to print N-tone images with multi-leveling techniques

1995-07-13

1997-11-18

Couso, Jose L.

Image analysis

Image compression or coding

G06K 936

Patent

active

056895860

ABSTRACT:
Generating a N-tone image from a grey scale image with a number of multi-level dither matrices. Both images have many pixels, with each pixel in the grey scale image having a grey level that is within a maximum and a minimum levels, and with each pixel in the N-tone image having a level that is one of N levels with N bigger than two. The method includes the step of determining the level of each pixel in the N-tone image based on the levels of its corresponding pixel in the grey scale image, and an original dither matrix, the separations between adjacent levels in the N levels are not uniform. After the determination process, every pixel in the N-tone image is modelled to represent its level. Based on the modelling, the N-tone image is printed.

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Ulichney, Robert, "Digital Halftoning", The MIT Press, 1987, Chapter 9.3, pp. 340-341.
Floyd, Robert et al., "An Adaptive Algorithm for Spatial Greyscale", Proceedings of the Society of Information Display, vol. 17, 1976, pp. 75-77.

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