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Color changing effects with anisotropic halftone prints on metal

Publications associées (49)

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Prediction of monochrome reflectance spectra with an extended Kubelka-Munk model

Roger Hersch, Patrick Emmel, Safer Mourad

We present a prediction model for digital printers and more specifically for electrophotographic devices. On the one hand, we propose an electrophotographic simulation model which estimates the microscopic structure of any printed toner layer based on its ...

Society for Imaging Science and Technology2002

Opponent Color Space Motivated by Retinal Processing

Sabine Süsstrunk, Silvio Borer

We introduce a new opponent color space, which aims to mimic the color processing in the primate retina. Recent data from physiology and morphology are used to determine the model and its parameters. The input signal in LMS representation is first nonlinea ...

2002

Method for generating a security document

Roger Hersch

The described method is used for generating a security document by applying a security pattern to an original image. The security pattern comprises a plurality of points, wherein each of said points represents a pattern value. Local averages are calculated ...

2001

Prediction of the Reflection Spectra of Three Ink Colour Prints

Roger Hersch, Patrick Emmel

We have developed a colour prediction model and an ink-spreading model. The present study aims at confirming the validity of both models for the case of ink-jet prints using cyan, magenta and yellow inks. Our colour prediction model, augmented by the ink-j ...

Society for Imaging Science and Technology2001

Predicting transmittance spectra of electrophotographic color prints

Roger Hersch, Patrick Emmel, Safer Mourad

For dry toner electrophotographic color printers, we present a numerical simulation model describing the color printer response based on a physical characterization of the different electrophotographic process steps. The proposed model introduces a Cross T ...

Society of Photo-Optical Instrumentation Engineers2001

A Unified model for color prediction of halftoned prints

Roger Hersch, Patrick Emmel

This study introduces a new model and a new mathematical formulation describing the light scattering and ink spreading phenomena in printing. The new model generalizes the classical Kubelka-Munk theory, and unifies it with the Neugebauer model within a sin ...

2000

Predicting Monochrome Color Transmittance Spectra of Electrophotographic Prints

Roger Hersch, Patrick Emmel, Safer Mourad

We create a computer based numerical model to predict the color spectra of printed patches on dry toner electrophotographic printers. The goal of this research is to obtain a simplified model describing the input-output behavior of the printers based on th ...

Society for Imaging Science and Technology2000

Multi-color and artistic dithering

Roger Hersch

A multi-color dithering algorithm is proposed, which converts a barycentric combination of color intensities into a multi-color non-overlapping surface coverage. Multi-color dithering is a generalization of standard bi-level dithering. Combined with tetrah ...

ACM, New York, NY, USA1999

Structure artifact free multi-level error diffusion algorithm

Roger Hersch

Error-diffusion is widely used to generate intensity levels between the primary levels of multi-level colour printing devices (ink-jet printers, electrophotographic printers). Standard error-diffusion algorithms produce structure artifacts at rational inte ...

The International Society for Optical Engineering1998

Multi-level colour halftonning algorithms

Roger Hersch, Isaac Amidror, Patrick Emmel

Methods for the halftoning of images on multi-level printing devices such as multi-level ink-jet printers are presented. Due to the relatively large size of single droplets, halftoning algorithms are still needed. However, since halftoning occurs between t ...

SPIE-Int. Soc. Opt. Eng1997