Publications related to On the Vulnerability of Finger Vein Recognition to Spoofing

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Spectral prediction and dot surface estimation models for halftone prints

Roger Hersch, Patrick Emmel, Frédérique Crété

We propose a new spectral prediction model as well as new approaches for modeling ink spreading which occurs when printing ink layer superpositions. The spectral prediction model enhances the classical Clapper-Yule model by taking into account the fact tha ...

SPIE-Int. Soc. Opt. Eng2003

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

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

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

Predicting the spectral behaviour of colour printers for transparent inks on transparent support

Roger Hersch, Isaac Amidror, Patrick Emmel

A spectral colour prediction model is proposed and applied to an ink jet printer. We limit the field of investigation to transparent inks printed on a transparent substrate. The proposed method is based on the computation of the transmittance spectra of co ...

Society for Imaging Science and Technology1996

Dithering algorithms for variable dot size printers

Roger Hersch, Isaac Amidror, Patrick Emmel

Dither-based methods for the halftoning of images on multi-level printing devices such as multi-level inkjet printers are presented. Due to the relatively large size of single droplets, halftoning algorithms are still needed. However, since halftoning occu ...

IEEE1996

Grid-based method for predicting the behaviour of colour printers

Roger Hersch, Patrick Emmel

A new grid-based method is proposed for predicting the behaviour of colour printers. The method takes into account the varying density of dots as well as the light diffusion in the paper by defining at different intensity levels different colorimetric valu ...

Soc Imaging Sci Technol, Springfield, VA, USA1995

On the Vulnerability of Finger Vein Recognition to Spoofing

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Spectral prediction and dot surface estimation models for halftone prints

Prediction of the Reflection Spectra of Three Ink Colour Prints

Predicting transmittance spectra of electrophotographic color prints

Predicting Monochrome Color Transmittance Spectra of Electrophotographic Prints

Structure artifact free multi-level error diffusion algorithm

Multi-level colour halftonning algorithms

Predicting the spectral behaviour of colour printers for transparent inks on transparent support

Dithering algorithms for variable dot size printers

Reproduction couleur par trames irrégulières et semi-régulières

Grid-based method for predicting the behaviour of colour printers

Predicting transmittance spectra of electrophotographic color prints

Structure artifact free multi-level error diffusion algorithm

Spectral prediction and dot surface estimation models for halftone prints

Prediction of the Reflection Spectra of Three Ink Colour Prints

Predicting the spectral behaviour of colour printers for transparent inks on transparent support

Multi-level colour halftonning algorithms

Predicting Monochrome Color Transmittance Spectra of Electrophotographic Prints

Reproduction couleur par trames irrégulières et semi-régulières

Grid-based method for predicting the behaviour of colour printers

Dithering algorithms for variable dot size printers