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High-speed first- and second-order frequency modulated halftoning
Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, The Institute of Technology.
2015 (English)In: Journal of Electronic Imaging (JEI), ISSN 1017-9909, Vol. 24, no 2Article in journal (Refereed) Published
Abstract [en]

Halftoning is a crucial part of image reproduction in print. First-order FM halftones, in which the single dots are stochastically distributed, is widely used in printing technologies, such as inkjet, that are able to stably print isolated dispersed dots. Printers, such as laser printers, that utilize electrophotographic technology are not able to stably print the isolated dots and therefore use clustered-dot halftones. Periodic clustered-dot, i.e. AM, halftones are commonly used in this type of printers but they suffer from undesired periodic interference pattern called moiré. An alternative solution is to use second-order FM halftones in which the clustered dots are stochastically distributed. The iterative halftoning techniques, that usually result in well-formed halftones, are operating on the whole input image and require extensive computations and thereby are very slow when the input image is large. In this paper, we introduce a method to generate image independent threshold matrices for first and second-order FM halftoning. The first-order threshold matrix generates well-formed halftone patterns and the second-order FM threshold matrix can be adjusted to produce clustered-dots of different size, shape and alignment. Using predetermined and image independent threshold matrices makes the proposed halftoning method a point-by-point process and thereby very fast.

Place, publisher, year, edition, pages
Society of Photo-optical Instrumentation Engineers (SPIE) , 2015. Vol. 24, no 2
National Category
Media Engineering
URN: urn:nbn:se:liu:diva-115791DOI: 10.1117/1.JEI.24.2.023016ISI: 000354873600016OAI: diva2:796674
Available from: 2015-03-19 Created: 2015-03-19 Last updated: 2015-07-08

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