A new paper on BRDF comparison has recently been published by xDDiff consortium members Ellie Molloy from MSL, New Zealand and Tatjana Quast from PTB, Germany. To extend the comparison beyond the capabilities within the consortium, Heather Patrick from NIST, USA did also participate.

In this paper, the BRDF of white and grey reflection standards has been determined in geometries covering the entire detection hemisphere. The results of this comparison demonstrate the current limits of agreement between BRDF measurements and highlight the discrepancy between goniospectrophotometric and integrating sphere-based realizations of diffuse reflectance.

The full paper can be found in the Published Papers section.

1. Conference: The 16th International Conference on New Developments and Applications in Optical Radiometry (NEWRAD 2026)
   Date: Sep. 13^th – 17^th 2026
   Location: Seogwipo KAL Hotel, Jeju Island, South Korea
   Presenter: Jinglin Fu
   Presentation title: Towards accurate diffuse transmittance characterisation of translucent volume diffusers
   Link: https://www.newrad2026.org/home
2. Conference: Colour and Visual Computing Symposium 2026 (CVCS 2026)
   Date: Sep. 24^th – 25^th 2026
   Location: Norwegian University of Science and Technology (NTNU), Gjøvik, Norway
   Presenter: Jinglin Fu
   Presentation title: Camera-based goniospectrophotometric BRDF measurement of anisotropic surfaces at PTB
   Link: https://www.cvcs.no/
3. Conference: DfwG-Jahrestagung 2026
   Date: Sep. 29^th – Oct.1^st 2026
   Location: TU Darmstadt, Darmstadt, Germany
   Presenter: Tatjana Quast
   Presentation title: Kamerabasierte BRDF-Messung von Oberflächen mit anisotropen Reflexionseigenschaften in der PTB
   Link: https://dfwg.de/dfwg-jahrestagungen/dfwg-jahrestagung-2026/

We are pleased to announce that Jinglin Fu has successfully defended his PhD thesis on June 23^rd 2026 at PTB.
His research, titled “Development and Metrological Characterization of a Measuring System for Accurate Multidimensional BTDF Measurements”, was conducted as part of the BxDiff project (18SIB03, previous project of xDDiff) and contributes to the metrological characterization of optical diffuse transmission.

The new publications are published. You can find it in the Published Papers section.

The 3rd progress meeting of the project xDDiff will be on June 10th (9 am to 6 pm) and 11th (9 am to 12 am) 2026. It will be preceded by our second xDDiff workshop on camera based goniospectrophotometry on June 9th (9 am to 6 pm). Both events take place at the site of RISE in Borås, Sweden.

You can see the workshop agenda here.

We are pleased to inform that we have a new stakeholder/collaborator that just joined xDDiff: ILM, the institute of laser technologies in medicine and metrology at Ulm university.

The institute of laser technologies in medicine and metrology at Ulm university, ILM, is a member of the “Innovationsallianz Baden-Württemberg”, which consists of 10 institutes conducting research and development especially for industrial applications. ILM has three departments, one of which, called “Quantitative Imaging and Sensors (QIS)”, works on the field of light propagation in scattering media and the determination of their optical properties. QIS has 20 employee working in experimental and theoretical research areas.

The 1st progress meeting of the project xDDiff will be on March 11th (9 am to 6 pm) and March 12th (9 am to 12 am) 2025 at the University of Alicante in Spain. Save the date to be with us in Alicante. We will come later with a full agenda and with registration instructions.

Logistics information – Alicante

The meeting will be face to face, but there will also be an opportunity to participate online.

The Kick-off meeting took place at CNAM in France on June 20th-21th 2024.

Objectives and activities of the project have been reviewed and agreed by partners.