Enhanced EP halftones with hexagonal dot packing
نویسندگان
چکیده
Hexagonal dot packing offers advantages for electrophotographic (EP) printing over conventional dot placement on a square grid. These advantages derive from a reduced neighborhood with which each dot interacts. Hexagonal dot packing has exhibited better grayscale performance with small clusters. Multiple dot centers in each tile allow obtaining more gray levels for a particular screen frequency. As a limiting case of multiple dot centers in a tile, stochastic screening on hexagonal and square grids is examined using a commercially available printing system. A novel method for comparing halftone spatial frequency components for all gray levels is demonstrated.
منابع مشابه
Comparison of Hexagonal and Square Dot Centers for EP Halftones
Hexagonal dot packing seems to offer benefits for halftone printing compared to conventional square dot packing, but little practical experience has been reported. Taking advantage of recent refinements in digital electrophotographic (EP) printer technology, the authors conducted experiments on a commercially deployable system to assess whether the potential advantages of hexagonal dot packing ...
متن کاملMoiré-free color halftoning using hexagonal geometry and spot functions
Hexagons are widely observed as a packing or tiling geometry in nature, yet they appear to have been avoided in conventional halftone tiling. A goal of the present study is to understand the potential barriers that have prevented their use and present new halftone geometry options that overcome the issues while offering several potential benefits. While conventional halftone geometries often in...
متن کاملEncoding Information in Clustered-Dot Halftones
Encoding Information in Clustered-Dot Halftones Robert Ulichney, Matthew Gaubatz, Steven Simske
متن کاملYule-Nielsen based multi-angle reflectance prediction of metallic halftones
Spectral prediction models are widely used for characterizing classical, almost transparent ink halftones printed on a diffuse substrate. Metallic-ink prints however reflect a significant portion of light in the specular direction. Due to their opaque nature, multi-color metallic halftones require juxtaposed halftoning methods where halftone dots of different colors are laid out side-by-side. I...
متن کاملAnalyzing halftone dot blurring by extended spectral prediction models.
Spectral prediction models for halftone prints generally assume homogeneously thick and sharply edged ink dots, i.e., bilevel halftones. In real prints, the ink thickness often decreases at the boundaries of the ink dots, thereby forming continuous-level halftones. The present study aims at verifying to what extent the classical Clapper-Yule and Yule-Nielsen models are able to predict the refle...
متن کامل