Multilevel halftoning with reduced texture contours and coverage

Details Multilevel halftoning with reduced texture contours and coverage Multilevel halftoning with reduced texture contours and coverage

1997-07-01

2000-01-11

Rogers, Scott

Facsimile and static presentation processing

Static presentation processing

Attribute control

358502, 358457, 358458, 358466, 358298, 382270, 382275, G06K 1502, H04N 1405, H04N 1409

Patent

active

06014226&

ABSTRACT:
In this proposal a method of multilevel halftoning is described that allows the definition of halftone patterns using more than two gray levels at a time. This feature can be employed to eliminate the texture contours produced when shades formed by a pattern of two levels blends into a shade formed by a single gray level. The method also gives control over the degree to which a given output gray level is used. This can be employed to limit ink coverage when certain levels require more ink to produce than do others. According to the method: initial pixel intensity ranges are obtained; the initial pixel intensity ranges are compared to at least two overlapping threshold arrays; and selection of enhanced pixel intensity levels are determined for halftone cells according to the comparison results of the initial pixel intensity ranges to at least two overlapping threshold arrays wherein the enhanced pixel intensity levels are a function of results from the comparison.

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"An Adaptive Algorithm for Spatial Grayscale" by Floyd and Steinberg, Proceedings of the SID 17/2, 75-77 (1976).
"Using Peano Curves for Bilevel Display of Continuous-tone Images", by Witten et al., IEEE Comp. Graph. and App. vol. 2, No. 5, pp. 47-52 (1982).
Naive Halftoning by Cole, Procceings of CGI '90, Springer Verlag pp. 203-222 (1990).
"Three Plus Five Makes Eight: A Simplified Approach to Halftoning" by Wyvill et al., Proceedings of CGI '91 Scientific Visualization of Physical Phenomena, pp. 379-392 (1991).
"Digital Halftoning with Space Filling Curves" by L. Velho et al., Computer Graphics, vol. 25 No. 4, pp. 81-90 (1991).
"Transmission of Gray Level Images by Multilevel Dither Techniques", by Pirsch and Netravali, Computers & Graphics vol. 7, No. 1, pp. 31-44, 1983.

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