Using the phase information in the halftone dot structure to min

Details Using the phase information in the halftone dot structure to min Using the phase information in the halftone dot structure to min

1997-03-27

1999-04-27

Rogers, Scott

Image analysis

Histogram processing

For setting a threshold

382237, 382275, 358456, 358463, 358298, H04N 1405, H04N 1409

Patent

active

058988220

ABSTRACT:
A method of reducing visible image artifacts that utilizes variable phase parameters (i.e., the standard x, y start position in halftone cells) during halftoning processes to match the phases of halftone cells, and further utilizes a brick approach to halftoning. The position in a halftone dot structure is correlated to the phase of sine waves for subsequent dots to be used in a halftoning process. Utilizing a selected x, y start position in halftone cells to match phase parameters of said halftone cells according to said position of said halftone dot and said subsequent dots. Switching from one dot to another dot on the same new starting position in the second dot will improve the probability that the thresholds and the slopes of the halftone dots are matched at the boundary between the two different dots.

REFERENCES:
patent: 4149194 (1979-04-01), Holladay
patent: 5045952 (1991-09-01), Eschbach
patent: 5226094 (1993-07-01), Eschbach
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., IEE Comp. Graph and App. vol. 2, No. 5, pp. 47-52 (1982).
"Naive Halftoning" by A.J. Cole, Proceedings 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. Valhi et al, Computer Graphics, vol. 24 No. 4, pp. 81-90 (1991).

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