09 décembre 2021

Workshop: High-precision BRDF Measurement

The european consortium on optical metrology for material appearance, BxDiff, as well as GDR Appamat and Institut d'Optique Graduate School propose a two-day winter school on high-precision BRDF measurement, including lessons on the state of the art, and a workshop on current research issues.


New requirements in terms of product appearance characterization, regarding gloss in particular, generate a growing demand in and a varied offer of measurement devices. This rapid evolution reinforces the need to develop reference tools and high precision primary metrology, including precise measurand definitions, primary standards, and high-precision instruments.  Most recent progresses in this domain, and same related problems that arise, are the subject of this two-day winter school co-organized by the european consortium BxDiff, founded by Euramet and gathering several metrological institutes and companies from Europe, GDR Appamat, and the Institut d’Optique Graduate School.

Registration to the event is free, but mandatory: see the registration form below


Day 1 – State of the art: optical metrology for appearance

9 december 2021 – Room L125

On the occasion of this winter school, the course day organized by the Institut d’Optique for students of the Advanced Imaging and Material Appearance (AIMA) master is open to all participants. The lessons will be given by Gael Obein from the LNE-CNAM laboratory, also leader of the BxDiff consortium, and other researcher of the consortium.

9:00 – Welcome and introduction

9:30 – 12:00 – Session 1

    • Gael Obein (LNE-CLAM) | Appearance and BRDF metrology


14:00 – 17:00 – Session 2

    • Alejandro Ferrero (CSIC, Spain) | BSSRDF
    • Nina Basic (METAS, Switzerland) | Sparkle
    • Lou Gevaux (LNE-CNAM) | PSF and translucency
    • Gael Obein (LNE-CNAM) | Gloss metrology


Day 2 – Research in progress : Speckle effect in high resolution BRDF measurement

10 December 2021 – Room L106

9:00 – Welcome

9:30 – Gael Obein (LNE-CLAM) | Evolution of BRDF measurement: when the speckle effect arose

10:00 – Pierre Chavel (Institut d’Optique Graduate School) | The speckle theory (1) : an introduction

10:45 – Pierre Chavel | The speckle theory (2) : advanced modelling

11:30 – Mathieu Hébert (Institut d’Optique Graduate School and University Saint-Etienne) | Educational demo with optical bench

12:30 lunch

14:30 – Thomas Labardens (LNE-CNAM) | Speckle effect in high resolution BRDF measurements with ConDOR

15:00 – Loic Denis (University of Saint-Etienne) | Removing speckle while maintaining resolution : methods in radar imaging.

15:30 – Myriam Zerrad (Institut Fresnel) | Preventing or using speckle in BRDF measurements

16:00 – Discussion : is the BRDF of a surface the expectation of the signal measured?

17:00 – end


Travel Information

Université Jean-Monnet, Centre des Savoirs pour l’Innovation
11 Rue Dr Rémy Annino, 42000 Saint-Étienne, France
Amphithéâtre 219 (2nd floor)

By car

See Googlemaps.
Free parking near the conference location (shown in red in the map <– en PJ).

By train

The main train station in Saint-Etienne is « Chateaucreux » station.

From the Saint-Etienne train station « Chateaucreux »: Take the tram line T2 up to the last stop « Cité du Design » (see the map)

By Plane

From Lyon Saint-Exupéry airport (25 km East from Lyon or 70 km from Saint-Etienne).

Take the tram RhônExpress from Lyon Saint-Exupéry airport to the Part Dieu railway station and then a train to Saint-Etienne Chateaucreux. Or a BlaBlaBus direct from the Lyon Saint-Exupéry airport to Saint-Etienne railway train station.

From the Saint-Etienne train station « Chateaucreux »: Take the tram line T2 up to the last stop « Cité du Design » (see the map)



Hotels **:

  • Ibis budget Saint-Étienne Centre Gare Châteaucreux **
  • Hôtel Le National **
  • Hôtel Furania **
  • Hotel Ibis Budget Saint-Etienne Stade **
  • Hotel Bar Restaurant Le Chaudron Vert **
  • Hotel Continental **
  • B&B Hôtel Saint-Etienne La Terrasse **

Hotels ***:

  • Hotel Austria Saint Etienne La Terrasse ***
  • Hôtel Les Poteaux Carrés ***
  • Hotel Ibis St Etienne – Gare Chateaucreux ***
  • Terminus du Forez Saint-Etienne Centre ***
  • Hôtel ibis Saint Étienne – La Terrasse ***
  • Inter-Hotel Le Cheval Noir, Saint-Étienne ***
  • Campanile St Etienne Centre – Villars La Terrasse ***

Health and safety measures

  • A “Health Pass” will be required to access the conference during the three days of the event.


It consists of digital (via the “TousAntiCovid” French app) or paper presentation of one of the following three health proofs:

1) a full vaccination schedule according to French rules:

    • 7 days after the 2nd injection of Pfizer, Moderna, AstraZeneca,
    • 28 days after the injection of Johnson & Johnson,
    • 7 days after an injection in people who previously contracted COVID-19,

2) or a negative PCR or antigenic test less than 48 hours,

3) or a positive RT-PCR or antigenic result demonstrating recovery from Covid-19, at least 11 days and less than 6 months old.

You will need this document also for travelling and for eating in restaurants.

Note: If you have been vaccinated in one of the following countries: European Union Member States, Andorra, Iceland, Liechtenstein, Monaco, Norway, Switzerland, United Kingdom (England and Wales only), you already have an EU Digital COVID Certificate, which is accepted in France, and you do not need a separate COVID certificate.

  • Masks are required for all participants in all inside public spaces, regardless of vaccination status.


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