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Gerhardt, Jérémie (2007) Reproduction spectrale de la couleur : approches par modélisation et par diffusion vectorielle de l'erreur. Doctorat signal et images, ENST, TSI, ENST p.209.
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Autres Localisations: http://www.ansatt.hig.no/jeremieg/Thesis/
Résumé
My research concerns spectral color reproduction within printers. We will first briefly expose the field of work: multi-spectral imaging, problem of metamerism and kind of data we aim to reproduce in comparison to color reproduction. Ideally we would like to perform an exact reproduction of an original scene: no perceived differences by a human observer between an original scene and its spectral color reproduction while changing the illumination conditions. Then introducing our spectral color reproduction system, a multi-colorant ink-jet printer, we will look at the spectral response of this system in order to reproduce spectral data. Two approaches have been tested: model based and vector error diffusion. The first approach follows a similar workflow as color reproduction: gamut mapping, colorant separation and halftoning. Using a printer model we can establish the forward transformation from colorant combinations to printed spectral reflectances. We will then consider the inverse relation to properly control our printing system. In the second approach we directly perform halftoning on the spectral image by spectral vector error diffusion. This technique combines both the colorant separation and the halftoning operation in one step. Improvements to this halftoning have been proposed in order to reduce visible artifacts due to error accumulation during the diffusion. These two approaches allow to work in simulation and to estimate the spectral color reproduction for different sets of colorants. We will conclude by comparing the reproductions of spectral data obtained with these two approaches.
| Type d'EPrint: | Thèse (Doctorat) |
|---|---|
| Directeur de Mémoire: | Schmitt, Francis et Hardeberg, Jon Yngve |
| Date: | 25 Octobre 2007 |
| Jury de Mémoire: | Süsstrunk, Sabine et Gouton, Pierre et Alquié, George |
| Ecole Doctorale: | ED 130 INFORMATIQUE, TELECOMMUNICATIONS ET ELECTRONIQUE (EDITE) |
| Discipline: | signal et images |
| Fonds: | ENST |
| Institution: | ENST |
| Laboratoire: | ENST, TSI |
| Sujets: | 2. Sciences et technologies de l'information et de la communication |
| Mots-clés libres: | Spectral color imaging, Spectral color reproduction, Spectral printer characterization, Spectral colorant separation, Halftoning, Error diffusion, Vector error diffusion, Spectral vector error diffusion, Spectral gamut mapping |
| Code ID: | 3354 |
| Déposé par : | JEREMIE GERHARDT |
| Déposé le : | 23 Mai 2008 |
Références Bibliographiques
Spectral Color Reproduction: Model Based and Vector Error Diffusion Approaches, Jérémie Gerhardt, Thesis
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