A Recent Hybrid Screen Design Example Jan Allebach
A Recent Hybrid Screen Design Example Jan Allebach, Wan-Eih Huang, and Tongyang Liu Xerox Webster Center Visit 13 May 2019
The Hybrid Screen • The hybrid screen is a screening algorithm which generates stochastic dispersed-dot textures in highlights and shadows, and periodic clustereddot textures in midtones. Dispersed-dot Clustered-dot Periodic n recursive ordering pattern ra t h tio i s n ot o m regularly nucleated clusters S Stochastic blue noise Xerox Webster Center Visit 13 May 2019 green noise
HP Laser. Jet Pro M 15 w Printer on sale at HP store for $79. 99 Xerox Webster Center Visit 13 May 2019
Printerland Review: HP Laser. Jet Pro M 15 w A 4 Mono Laser Printer Xerox Webster Center Visit 13 May 2019
Recent work with hybrid screens l Monochrome hybrid, multilevel, halftone screen with unequal spatial resolution for a low-cost electrophotographic printer w Hybrid screen method w Clustered-dot periodic screen w Supercell w DBS w Unequal resolution printing model w Multilevel output W. Huang, T. Liu, K. Bengston, and J. Allebach, “Monochrome Hybrid, Multilevel Halftone Screen with Unequal Resolution for a Low-Cost Electrophotographic Printer, ” Color Imaging XXIII: Displaying, Processing, Hardcopy, and Applications, (Part of IS&T Electronic Imaging 2018), R. Eschbach, G. Marcu, and A. Rizzi, Eds. San Francisco, CA, 29 January -2 February 2018. Unequal spatial resolution Xerox Webster Center Visit 13 May 2019 *Research supported by HP, Inc.
Xerox Webster Center Visit 13 May 2019
Hybrid screen Highlight cores and shadow cores Highlight core Shadow core l l S shape highlight cores and shadow cores 1 5 3 2 6 4 9 7 1 0 The microcell sequence of each core might not be the same w The sequences in the highlight and shadow cores are determined by DBS w Spatial freedom l 8 1 The sequences in the remaining pixels (midtone) are the same for all microcells w Periodic clustered-dot texture 6 1 1 1 2 3 2 5 6 4 7 Example: 8 x 12 supercell Xerox Webster Center Visit 13 May 2019 8 8
Xerox Webster Center Visit 13 May 2019
Xerox Webster Center Visit 13 May 2019
Xerox Webster Center Visit 13 May 2019
Xerox Webster Center Visit 13 May 2019
Xerox Webster Center Visit 13 May 2019
Xerox Webster Center Visit 13 May 2019
Thank you for your attention! White Clay Creek, Newark, DE, ca. 1970. Xerox Webster Center Visit 13 May 2019
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