82 research outputs found
The French National 3D Data Repository for Humanities: Features, Feedback and Open Questions
We introduce the French National 3D Data Repository for Humanities designed
for the conservation and the publication of 3D research data in the field of
Humanities and Social Sciences. We present the choices made for the data
organization, metadata, standards and infrastructure towards a FAIR service.
With 437 references at the time of the writing, we have feedback on some
challenges to develop such a service and to make it widely used. This leads to
open questions and future developments.Comment: CAA 2021 - "Digital Crossroads" full paper version (in review
Imagerie médicale et patrimoine anthropologique : vers un contrÎle total de la chaßne des traitements dans l'analyse morphométrique tridimensionnelle
International audienceThe objective of the present paper is to give some data in medical imaging and 3D reconstruction applied in bio-anthropological field. Scanner CT images are a powerful tool to explore internal structures, to reconstruct incomplete bones and to give biomechanical interpretation based on bone morphology. Further, we propose to argument a cultural hypothesis relatively to a deliberate treatment concerning a human boneNous prĂ©sentons quelques applications de lâimagerie mĂ©dicale et de la reconstitution 3D dans le domaine de lâanthropologie biologique. Lâacquisition et lâexploitation dâimages scanner CT permettent dâaccĂ©der aux structures internes, de reconstituer des parties manquantes et dâexploiter des caractĂ©ristiques bio-mĂ©caniques. Nous proposons Ă©galement lâargumentation dâune hypothĂšse culturelle en relation avec un amĂ©nagement pratiquĂ© sur un os humain
Vocabulaire 3D - Lexique pour les Sciences Humaines et Sociales
Ce document est le rĂ©sultat dâun effort continu pour permettre aux acteurs des SHS et ceux de la 3D dâinteragir autour dâun vocabulaire commun. Ce lexique a pour but dâaccompagner les diffĂ©rents livrables du consortium 3D. Il a aussi vocation Ă terme Ă aider Ă lâenrichissement de TaDiRAH , « Taxonomy of Digital Research Activities in the Humani-ties » du consortium europĂ©en DARIAH . Ce processus continu est illustrĂ© par le fait que ce document en est Ă sa deuxiĂšme versionCe document est le rĂ©sultat dâun effort continu pour permettre aux acteurs des SHS et ceux de la 3D dâinteragir autour dâun vocabulaire commun. Ce lexique a pour but dâaccompagner les diffĂ©rents livrables du consortium 3D. Il a aussi vocation Ă terme Ă aider Ă lâenrichissement de TaDiRAH , « Taxonomy of Digital Research Activities in the Humani-ties » du consortium europĂ©en DARIAH . Ce processus continu est illustrĂ© par le fait que ce document en est Ă sa deuxiĂšme versio
Share - Publish - Store - Preserve. Methodologies, Tools and Challenges for 3D Use in Social Sciences and Humanities
Through this White Paper, which gathers contributions from experts of 3D data as well as professionals concerned with the interoperability and sustainability of 3D research data, the PARTHENOS project aims at highlighting some of the current issues they have to face, with possible specific points according to the discipline, and potential practices and methodologies to deal with these issues. During the workshop, several tools to deal with these issues have been introduced and confronted with the participants experiences, this White Paper now intends to go further by also integrating participants feedbacks and suggestions of potential improvements. Therefore, even if the focus is put on specific tools, the main goal is to contribute to the development of standardized good practices related to the sharing, publication, storage and long-term preservation of 3D data
Embedding continuous surfaces into discrete thick surfaces.
Dans le contexte des sciences archĂ©ologiques, des images tridimensionnelles issues de scanners tomodensitomĂ©triques sont segmentĂ©es en rĂ©gions dâintĂ©rĂȘt afin dâen faire une analyse. Ces objets virtuels sont souvent utilisĂ©s dans le but dâeffectuer des mesures prĂ©cises. Une partie de ces analyses nĂ©cessite dâextraire la surface des rĂ©gions dâintĂ©rĂȘt. Cette thĂšse se place dans ce cadre et vise Ă amĂ©liorer la prĂ©cision de lâextraction de surface. Nous prĂ©sentons dans ce document nos contributions : tout dâabord, lâalgorithme du HMH pondĂ©rĂ© dont lâobjectif est de positionner prĂ©cisĂ©ment un point Ă lâinterface entre deux matĂ©riaux. AppliquĂ©e Ă une extraction de surface, cette mĂ©thode pose des problĂšmes de topologie sur la surface rĂ©sultante. Nous avons donc proposĂ© deux autres mĂ©thodes : la mĂ©thode du HMH discret qui permet de raffiner la segmentation dâobjet 3D, et la mĂ©thode du HMH surfacique qui permet une extraction de surface contrainte garantissant lâobtention dâune surface topologiquement correcte. Il est possible dâenchainer ces deux mĂ©thodes sur une image 3D prĂ©-segmentĂ©e afin dâobtenir une extraction de surface prĂ©cise des objets dâintĂ©rĂȘt. Ces mĂ©thodes ont Ă©tĂ© Ă©valuĂ©es sur des acquisitions simulĂ©es dâobjets synthĂ©tiques et des acquisitions rĂ©elles dâartĂ©facts archĂ©ologiques.In the context of archaeological sciences, 3D images produced by Computer Tomography scanners are segmented into regions of interest corresponding to virtual objects in order to make some scientific analysis. These virtual objects are often used for the purpose of performing accurate measurements. Some of these analysis require extracting the surface of the regions of interest. This PhD falls within this framework and aims to improve the accuracy of surface extraction. We present in this document our contributions : first of all, the weighted HMH algorithm whose objective is to position precisely a point at the interface between two materials. But, applied to surface extraction, this method often leads to topology problems on the resulting surface. So we proposed two other methods : The discrete HMH method which allows to refine the 3D object segmentation, and the surface HMH method which allows a constrained surface extraction ensuring a topologically correct surface. It is possible to link these two methods on a pre-segmented 3D image in order to obtain a precise surface extraction of the objects of interest These methods were evaluated on simulated CT-scan acquisitions of synthetic objects and real acquisitions of archaeological artefacts
Plongement de surfaces continues dans des surfaces discrĂštes Ă©paisses.
In the context of archaeological sciences, 3D images produced by Computer Tomography scanners are segmented into regions of interest corresponding to virtual objects in order to make some scientific analysis. These virtual objects are often used for the purpose of performing accurate measurements. Some of these analysis require extracting the surface of the regions of interest. This PhD falls within this framework and aims to improve the accuracy of surface extraction. We present in this document our contributions : first of all, the weighted HMH algorithm whose objective is to position precisely a point at the interface between two materials. But, applied to surface extraction, this method often leads to topology problems on the resulting surface. So we proposed two other methods : The discrete HMH method which allows to refine the 3D object segmentation, and the surface HMH method which allows a constrained surface extraction ensuring a topologically correct surface. It is possible to link these two methods on a pre-segmented 3D image in order to obtain a precise surface extraction of the objects of interest These methods were evaluated on simulated CT-scan acquisitions of synthetic objects and real acquisitions of archaeological artefacts.Dans le contexte des sciences archĂ©ologiques, des images tridimensionnelles issues de scanners tomodensitomĂ©triques sont segmentĂ©es en rĂ©gions dâintĂ©rĂȘt afin dâen faire une analyse. Ces objets virtuels sont souvent utilisĂ©s dans le but dâeffectuer des mesures prĂ©cises. Une partie de ces analyses nĂ©cessite dâextraire la surface des rĂ©gions dâintĂ©rĂȘt. Cette thĂšse se place dans ce cadre et vise Ă amĂ©liorer la prĂ©cision de lâextraction de surface. Nous prĂ©sentons dans ce document nos contributions : tout dâabord, lâalgorithme du HMH pondĂ©rĂ© dont lâobjectif est de positionner prĂ©cisĂ©ment un point Ă lâinterface entre deux matĂ©riaux. AppliquĂ©e Ă une extraction de surface, cette mĂ©thode pose des problĂšmes de topologie sur la surface rĂ©sultante. Nous avons donc proposĂ© deux autres mĂ©thodes : la mĂ©thode du HMH discret qui permet de raffiner la segmentation dâobjet 3D, et la mĂ©thode du HMH surfacique qui permet une extraction de surface contrainte garantissant lâobtention dâune surface topologiquement correcte. Il est possible dâenchainer ces deux mĂ©thodes sur une image 3D prĂ©-segmentĂ©e afin dâobtenir une extraction de surface prĂ©cise des objets dâintĂ©rĂȘt. Ces mĂ©thodes ont Ă©tĂ© Ă©valuĂ©es sur des acquisitions simulĂ©es dâobjets synthĂ©tiques et des acquisitions rĂ©elles dâartĂ©facts archĂ©ologiques
Embedding continuous surfaces into discrete thick surfaces.
Dans le contexte des sciences archĂ©ologiques, des images tridimensionnelles issues de scanners tomodensitomĂ©triques sont segmentĂ©es en rĂ©gions dâintĂ©rĂȘt afin dâen faire une analyse. Ces objets virtuels sont souvent utilisĂ©s dans le but dâeffectuer des mesures prĂ©cises. Une partie de ces analyses nĂ©cessite dâextraire la surface des rĂ©gions dâintĂ©rĂȘt. Cette thĂšse se place dans ce cadre et vise Ă amĂ©liorer la prĂ©cision de lâextraction de surface. Nous prĂ©sentons dans ce document nos contributions : tout dâabord, lâalgorithme du HMH pondĂ©rĂ© dont lâobjectif est de positionner prĂ©cisĂ©ment un point Ă lâinterface entre deux matĂ©riaux. AppliquĂ©e Ă une extraction de surface, cette mĂ©thode pose des problĂšmes de topologie sur la surface rĂ©sultante. Nous avons donc proposĂ© deux autres mĂ©thodes : la mĂ©thode du HMH discret qui permet de raffiner la segmentation dâobjet 3D, et la mĂ©thode du HMH surfacique qui permet une extraction de surface contrainte garantissant lâobtention dâune surface topologiquement correcte. Il est possible dâenchainer ces deux mĂ©thodes sur une image 3D prĂ©-segmentĂ©e afin dâobtenir une extraction de surface prĂ©cise des objets dâintĂ©rĂȘt. Ces mĂ©thodes ont Ă©tĂ© Ă©valuĂ©es sur des acquisitions simulĂ©es dâobjets synthĂ©tiques et des acquisitions rĂ©elles dâartĂ©facts archĂ©ologiques.In the context of archaeological sciences, 3D images produced by Computer Tomography scanners are segmented into regions of interest corresponding to virtual objects in order to make some scientific analysis. These virtual objects are often used for the purpose of performing accurate measurements. Some of these analysis require extracting the surface of the regions of interest. This PhD falls within this framework and aims to improve the accuracy of surface extraction. We present in this document our contributions : first of all, the weighted HMH algorithm whose objective is to position precisely a point at the interface between two materials. But, applied to surface extraction, this method often leads to topology problems on the resulting surface. So we proposed two other methods : The discrete HMH method which allows to refine the 3D object segmentation, and the surface HMH method which allows a constrained surface extraction ensuring a topologically correct surface. It is possible to link these two methods on a pre-segmented 3D image in order to obtain a precise surface extraction of the objects of interest These methods were evaluated on simulated CT-scan acquisitions of synthetic objects and real acquisitions of archaeological artefacts
3D Reconstruction of Archaeological Sites Using Photogrammetry
The 3D reconstructionof an archaeological site is a difficult task, taking into account the available documentation. Our team, supported by the TGE Adonis, is specialized in 3D reconstruction and conservation of 3D data. We already use numerous sources, like excavation documentation, ancient texts, any kind of representation, land surveys, in-situ pictures, laser or time of flight scannography, and experiments of archaeologists, anthropologists and architects. Since the 80's, each model we produce are scientifically checked by specialists, and regularly updated to follow new knowledges and investigations. In this paper, we present the use of photogrammetry to reconstruct a 3D model of an archaeological site, as a new source of data, less expensive and more accessible than scanners.We present concrete cases: a chapel (12 century p.C., Moissac, France), catacombs of St Pierre et Marcellin (250 p.C., Rome, Italy) and a roman coin (5 a.C., Loron, Croatia). The question of scale and texture mapping is explored through the software like photomodeler and PMVS. Finaly, we discuss the accuracy of photogrammetry in comparison to scanners, the accessibility of this technique to archaeologists, and the interest for fragile artefacts in museums
Anatomical placement of the human eyeball in the orbit : validation using computed tomography scans of living adults and prediction for facial approximation
International audienc
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