Project: New quantities for the measurement of appearance

Acronym BxDiff (Reference Number: 18SIB03)
Duration 01/05/2019 - 30/04/2022
Project Topic Appearance is increasing used as a differentiator in product quality and desirability. Previously accepted references, such as reflectance at single angular measurements, are becoming obsolete as branding depends on more complex appearance factors. Bidirectional Transmittance Distribution Function (BTDF) and Bidirectional scattering distribution function (BSSRDF) are computer graphics algorithms that describe visual effects caused by surfaces. Commercial bidirectional spectrophotometers are available for which NMIs could provide calibration services, although there’s no standard definitions for these quantities. The project will define BTDF and BSSRDF, develop primary facilities for their realisation traceable to the SI, and improve measurements of the Bidirectional Reflectance Distribution Function (BRDF). New calibration services will arise for spectrophotometers manufacturers and the industrial R&D market. A definition and realisation of BSSRDF will provide the first calibration solution, impacting industries such as cosmetics, automotive, plastics, and paper, as well as the rendering software market. New metrological references for spectrophotometry will improve product quality control and virtual product representation in digital design.
Website visit project website
Network EMPIR
Call EMPIR Call 2018

Project partner

Number Name Role Country
1 Conservatoire national des arts et métiers Coordinator France
2 Aalto-korkeakoulusäätiö sr Partner Finland
3 Cesky Metrologicky Institut Partner Czech Republic
4 Agencia Estatal Consejo Superior de Investigaciones Cientificas Partner Spain
5 Dansk Fundamental Metrologi A/S Partner Denmark
6 Eidgenössisches Institut für Metrologie METAS Partner Switzerland
7 Physikalisch-Technische Bundesanstalt Partner Germany
8 RISE Research Institutes of Sweden AB Partner Sweden
9 Danmarks Tekniske Universitet Partner Denmark
10 RISE Innventia AB Partner Sweden
11 Katholieke Universiteit Leuven Partner Belgium
12 Université Jean Monnet Saint-Etienne Partner France
13 Callaghan Innovation Observer New Zealand
14 Labsphere, Inc. Observer United States of America
15 Lucideon Limited Observer United Kingdom
16 NCS Colour Aktiebolag Observer Sweden
17 Saint Gobain Recherche SA Observer France