Depuis sa création en 2014, la conférence Material Appearance est hébergée par le symposium IS&T Electronic Imaging. Cette année, le symposium se tiendra intégralement en ligne, et sera accessible en replay aux inscrits.

Programme

Le programme des conférences du symposium sera mis en ligne bientôt sur le site IS&T Electronic Imaging.

Au programme de Material Appearance, qui sera mis en ligne sur le site officiel de la conference très prochainement:

Keynotes (60 min)

• Steve Marschner (Cornell University, USA) : Rendering the appearance of fine-scale surface detail
• Clotilde Boust (C2RMF, France) : Imaging sciences for cultural heritage

Orateurs invités (30 min)

• Pablo Santafé (Optics Institute of CSIC, Spain) : Traceable measure of BSSRDF
• Vahid Babaei (Max-Planck-Institut für Informatik, Germany) : Artificial intelligence for appearance design and fabrication

Session : Materials and lighting (60 min)

• Mathieu Hebert (Université de Saint-Etienne, France) : Why a clear coating modifies halftone color prints
• Ramamoorthy Luxman (Universite de Bourgogne) : Next best light position (NBLP) estimation for automating the RTI acquisition process
• Vlado Kitanovski (Norwegian University of Science and Technology, Norway) : Objective evaluation of relighting models on translucent materials from multispectral RTI images

Session : Surface characterization (60 min)

• Marjan Shahpaski (EPFL, Switzerland) : Surface roughness estimation using structured light projection
• Thomas Labardens (CNAM, France) : Study and simulations of speckle effects on BRDF measurements at very high resolution
• Shuhei Watanabe (RICOH Company, Japan) : Image-based perceptual editing: Leather « authenticity » as a case study (JIST-first)

Résumés

Steve Marschner (Cornell University, USA) : Rendering the appearance of fine-scale surface detail
In material appearance, detail is an important part of the big picture.  The eye uses fine detail in images to learn about materials, and leaving this structure out lends surfaces a too-smooth appearance that makes them look synthetic.  This talk looks at a series of techniques that focus on getting the details right and find that surprisingly small features matter.  They start with the straightforward problem of rendering rough surfaces, which are covered with details much smaller than pixels.  Techniques for filtering out the too-small details are good at getting the right average color, but we show that they lose glittery, glinty effects that are important to the appearance.  We have developed new methods that make it practical to render these details accurately, by generating them randomly or representing them explicitly and by modeling their effects using geometric or wave optics models.  This is collaborative work with students and colleagues at Cornell, UCSD, and Autodesk.

Clotilde Boust (C2RMF, France) : Imaging sciences for cultural heritage
Cultural heritage conservation studies use several techniques to understand materials and fabrication process of artworks. Optical images using radiations from XRays to Infrared are non invasives analysis revealing informations from surface to inner structure of objects. This keynote will present imaging techniques (scientific imaging, X-Rays tomography, 3D surface) and their use in museum objects conservation and art history studies.

Pablo Santafé (Optics Institute of CSIC, Spain) : Traceable measure of BSSRDF
The Bidirectional Surface-Scattering Reflectance Distribution Function
(BSSRDF) is a distribution function that describes the relation
between a radiant flux that strikes an object and its radiance at any
position on its surface. Due to its
complexity, there is still no measurement system capable of
characterizing it with metrological precision, and transferring its
unit to other instruments. The key of the BSSRDF lies in its
relationship with the translucency of objects, and in that it allows
describing those optical properties that affect volume scattering. In
the Optics Institute of CSIC, a system capable of measuring BSSRDF has been
developed, the Spanish Gonio-Spectrophotometer (GEFE).
In this work, the BSSRDF of 12 homogeneous cataloged samples has been
measured, with uncertainties lower than 3%. The obtained results can
became a standard for other measuring instruments, thus transferring
the unit of BSSRDF.

Vahid Babaei (Max-Planck-Institut für Informatik, Germany) : Artificial intelligence for appearance design and fabrication
Commercially available advanced manufacturing devices, such as 3D printers or laser marking systems, allow for creating multi-material 3D composites or laser-material processing at very high resolutions. From an appearance fabrication viewpoint, this brings a huge potential for reproduction of a variety of objects (e.g., cultural heritage artifacts) or creating disruptive products never possible before. In this talk, I argue that data-driven approaches have an immense capacity for accurate and efficient appearance design and fabrication. Unlike physical models that rely on the sophisticated relationship of highly specialized measurements, data-driven models count on the power of big, but simple to acquire data. I will show two examples of creative use of data-driven methods for two different technologies: multi-materials 3D printing, and laser marking.

Pour s’incrire

Les inscriptions au Symposium se font par le site web de IS&T: https://www.imaging.org/site/IST/IST/Conferences/EI/EI_2021/Attend.aspx

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