Department of Signal Processing and Acoustics

BiRD project (2017-2020)

European Metrology Programme for Innovation and Research (EMPIR) project BiRD - "Bidirectional reflectance definitions".

BiRD project (2017-2020)

European Metrology Programme for Innovation and Research (EMPIR) project BiRD - "Bidirectional reflectance definitions".

This project aims to clarify how bidirectional reflectance distribution function (BRDF) measurements should be carried out on both classical surfaces and surfaces exhibiting goniochromatism, gloss and/or sparkle visual effects.

Metrology Research Institute's contributions to WP1 and WP2 are based on competence in the area of material characterisations and assessment of settings of instruments for BRDF and gloss measurements.

bird
Figure 1.

Within WP1 Aalto performed series of BRDF measurements of goniochromatic samples and investigated whether variations in illumination beam size or detection solid angle have any effect on the result of conducted measurements. Preliminary results suggested that variation of solid angle from 0.0086 to 0.0239 sr had almost negligible effect on BRDF measurements as well as variation of beam size between 5 mm to 13 mm.

In WP2 Metrology Research Institute reviewed the state of the art in terms of existing commercial colour management software for colour quality control of surface appearance in collaboration with University of Alicante, Spain (UA). Based on that Aalto developed the first version of an open source code to plot and to compare BRDF in polar mode, using X, Y, Z representations with inputs from UA. In parallel, with support from UA, Aalto developed an open source code to visualize BRDF in color domain (CIELAB space) and study colour travel and appearance. The code is being tested with data from other activities of the project, and from those obtained in IND52 xDReflect project.

Link to the developed web application: https://birdview-app.herokuapp.com/

Link to the code source: https://github.com/BiRD-project/BiRD_view_v4

Contact person: Farshid Manoocheri, Dmitri Lanevski

More information about the project can be found at the project website: https://www.birdproject.eu

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