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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 66, Iss. 10 — Oct. 1, 1976
  • pp: 985–989

Halftone method with edge enhancement and Moiré suppression

Paul G. Roetling  »View Author Affiliations


JOSA, Vol. 66, Issue 10, pp. 985-989 (1976)
http://dx.doi.org/10.1364/JOSA.66.000985


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Abstract

A method has been found for separating control of high and low spatial frequencies in a continuous-tone image during conversion to a halftone (binary) form for printing. This method allows edge enhancement, while simultaneously limiting creation of spurious Moiré patterns due to image frequencies near the halftone screen frequency. Macroscopic grey scale control is achieved by determination of average grey level by low-pass filtering of the image. This information is used to set halftone dot size. Microscopic or detail contrast is controlled as in the ordinary halftone process, that is, by screen shape and screen modulation, which therefore affects partial dot structure. In the absence of detail, the results of this process match ordinary halftones. In detailed areas, however, the low-frequency control limits generation of spurious low-frequency Moiré patterns, while free choice of screen modulation allows enhancement of edges up to the common limit where image noise becomes dominant.

© 1976 Optical Society of America

Citation
Paul G. Roetling, "Halftone method with edge enhancement and Moiré suppression," J. Opt. Soc. Am. 66, 985-989 (1976)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-66-10-985


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References

  1. Pocket Pal, 10th ed. (International Paper Co., New York, 1970), pp. 154–173.
  2. J. A. C. Yule, Principles of Color Reproduction (Wiley, New York, 1967),
  3. B. E. Bayer, "An Optimum Method for Two-Level Rendition of Continuous-Tone Pictures," in (IEEE 1973 International Conference on Communications, Vol. 1 (IEEE, New York, 1973), pp. 26-11 to 26-15.
  4. D. Kermisch and P. Roetling, "Fourier Spectrum of Halftone Images," J. Opt. Soc. Am. 65, 716–723 (1975).
  5. R. Floyd and L. Steinberg, "An Adaptive Algorithm for Spatial Grey Scale," in SID 1975 International Symposium Digest of Technical Papers (Lewis Winner, New York, 1975). p. 36.
  6. The scanner is a HCM Hell Chromograph DC300 Color Scanner.

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