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<p>Periodic clustered-dot halftones are widely used in electrophotographic printers
due to the relatively poor print stability of this class of printers. It is important to
analyze the nature and the causes of perceived fluctuation in order to understand the
factors that prevent the high-end digital presses from achieving the same print quality
as the commercial offset presses. In order to better approximate the screen sets used
for the commercial offset presses, irregular screen sets can be considered. We start by
developing a set of candidate screen tile-vectors that best fit the specified screen frequency, screen angle, and printer resolution. We then perform Fourier-based analysis
of regular and irregular periodic, clustered-dot halftone textures in order to understand how perceived fluctuation relates to the halftoning technology. After exploring
the search for the best single separation geometry, we consider the superposition of
multiple periodic clustered-dot halftones, and propose to apply HVS-based model,
which assists us in finding the best color assignments to the superimposed halftones.
It turned out that the choice of the best color assignments depends on different combinations of colorant absorptance values, hence we propose to apply different color
assignments within the image depending on the local color and content of the image.
Next, we propose a step-by-step screen design for standard and high resolution periodic irregular clustered-dot halftones. Finally, we presented monochrome DBS-based
screen design with overlapping clusters of 2 × 2 or 3 × 3 pixels, which can also be used
in electrophotographic printers.
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| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/8968505 |
| Date | 16 December 2020 |
| Creators | Altyngul Jumabayeva (7011485) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Rights | CC BY 4.0 |
| Relation | https://figshare.com/articles/thesis/Model-based_Analysis_and_Design_of_Color_Screen_Sets_for_Clustered-Dot_Periodic_Halftoning_and_Design_of_Monochrome_Screens_Based_on_Direct_Binary_Search_for_Aperiodic_Dispersed-Dot_Halftoning/8968505 |
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