Extracting Composition and Texture of Ancient
il y a 2 semaines
**Extracting composition and texture of ancient pigments from modeling of their spectral reflectance**:
- Réf
- **ABG-114225**
- Sujet de Thèse- 07/05/2023- Contrat doctoral- Idex université Grenoble Alpes- Lieu de travail- Grenoble - Auvergne-Rhône-Alpes - France- Intitulé du sujet- Extracting composition and texture of ancient pigments from modeling of their spectral reflectance- Champs scientifiques- Sciences de l’ingénieur
- Informatique
- Matériaux
- Mots clés- Archeology, minerals, pigments, material science, optics, radiative transfer, computer graphics, color**Description du sujet**:
- Create a physical model that connects the optical properties of the pigments used in cave paintings, and measured in-situ, to their physical and chemical properties: chemical composition of the minerals and binders, granulometry, texture. That model will be based on a physical model of radiative transfer inside the pigment layer.**Scientific challenges**:
- The pigments used in cave paintings are usually dry powders. We do not currently have a physical model for the reflectance of dry powders, as opposed to suspensions or compact materials.
- Experiments show that pigments can have different colors with the same chemical and mineral composition, implying that scattering effects are playing a role in the color.
- We have very few reference materials with well known physical properties and measured spectral response as well as bidirectional reflectance function, for dry powders.
- We do not have accurate optical constants for the materials (minerals, binders) used in the pigments, and measuring them is challenging.
- Painting materials are applied on a rock wall. This substrate contributes to the overall reflectance and appearance in some spectral ranges. We will have to remove its contribution.
**Methodology**:
- Build a corpus of dry mineral powders with known chemical composition and granulometry, and measure their bidirectional reflectance and spectrum in the visible and near infra-red, for a large number of incoming light direction and outgoing observation.
- Build a physical model for radiative transfer inside granular materials, possibly by adapting existing models.
- Invert this physical model to extract the characteristics of the materials from the measured spectrum and reflectance. Validate the model using the measures from the first step.
- Expand the model to mixtures of several minerals simulating natural pigments.
- Test on actual rock paintings.
**Possible extensions**:
- Invert the effects of aging, by reconstructing the appearance of the material as it was initially (with more pigments present, possibly a matrix connecting them).
**Prise de fonction**:
- 01/09/2023**Nature du financement**:
- Contrat doctoral**Précisions sur le financement**:
**Présentation établissement et labo d'accueil**:
- Idex université Grenoble Alpes- One of the major research-intensive French universities, Univ. Grenoble Alpes** enjoys an international reputation in many scientific fields, as confirmed by international rankings. It benefits from the implementation of major European instruments (ESRF, ILL, EMBL, IRAM, EMFL* ). The vibring ecosystem, grounded on a close interaction between research, education and companies, has earned Grenoble to be ranked as the 5th most innovative city in the world. Surrounded by mountains, the campus benefits from a natural environment and a high quality of life and work environment. With 7000 foreign students and the annual visit of more than 8000 researchers from all over the world, Univ. Grenoble Alps is an internationally engaged university.
- A personalized Welcome Center for international students, PhDs and researchers facilitates your arrival and installation.
- Key figures:
- + 50,000 students including 7,000 international students
- 3,700 PhD students, 45% international
- 5,500 faculty members
- 180 different nationalities
- 1st city in France where it feels good to study and 5th city where it feels good to work
- ISSO: International Students & Scholars Office affiliated to EURAXESS
- The Jean Kuntzmann Laboratory (LJK) is a joint research center between the Grenoble Alpes University, CNRS, Grenoble INP (Institute of Engineering) and Inria (UMR 5224).- The unit is composed of three services and three scientific departments, with research axis in applied mathematics and informatics.- The “Geometry & Images” department focuses on the production and analysis of images, notably through numerical simulation of light transport.- IPAG is CNRS / UGA joint research unit covering the study of various objects in astrophysics. The ‘Planetology’ team mostly focuses on the study of the surface and subsurface of solar system objects through remote sensing and laboratory simulations. One group of the ‘Planétology’ team is focused on the experimental study of the spectro-photometric properties of geo and planetological materials (ices, mineral & rocks, organic matt
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