The hybrid screen: improving the breed

Changhyung Lee; Jan P. Allebach

doi:10.1117/12.711183

29 January 2007 The hybrid screen: improving the breed

Changhyung Lee, Jan P. Allebach

Proceedings Volume 6493, Color Imaging XII: Processing, Hardcopy, and Applications; 649318 (2007) https://doi.org/10.1117/12.711183
Event: Electronic Imaging 2007, 2007, San Jose, CA, United States

Abstract

The hybrid screen is a halftoning method that generates stochastic dispersed dot textures in highlights and periodic clustered dot textures in midtones. Each tone level is sequentially designed from highlight to midtone by applying an iterative halftoning algorithm such as direct binary search (DBS). By allowing random seeding and swap-only DBS in a predefined core region within each microcell, we design each level while satisfying the stacking constraint and guaranteeing a smooth transition between different levels. This paper focuses on a number of enhancements to the original hybrid screen and their impacts on print quality. These include analytical determination of the human visual system filter in the spatial domain for DBS, multilevel screen design either by extending a bilevel screen or by directly generating a multilevel screen on the high resolution grid. Our results show that the multilevel screen design method has a direct impact on hybrid screen design parameters such as the optimal core size. We also extend the whole design process to color by jointly optimizing the color screens using color DBS. Our results demonstrate a significant improvement in the highlights over halftones generated by independently designed screen.

Citation Download Citation

Changhyung Lee and Jan P. Allebach "The hybrid screen: improving the breed", Proc. SPIE 6493, Color Imaging XII: Processing, Hardcopy, and Applications, 649318 (29 January 2007); https://doi.org/10.1117/12.711183

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