Gonio-Spectrophotometer for Low-Uncertainty Bidirectional Scatter Distribution Function (BSDF) Measurements A. M. Rabal, J. L. Fontecha, A. Ferrero, A.

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Gonio-Spectrophotometer for Low-Uncertainty Bidirectional Scatter Distribution Function (BSDF) Measurements A. M. Rabal, J. L. Fontecha, A. Ferrero, A. Pons, J. Campos y A. Corróns IFA-CSIC rabal@ifa.cetef.csic.es Ciencia y Tecnología del color. Seminario 2009

Outline BSDF. Theory Aims Instrument description Measurement procedure Future work Ciencia y Tecnología del color. Seminario 2009

BSDF. Theory Directional Hemispherical Conical Nicodemus, 1977 Ciencia y Tecnología del color. Seminario 2009

Aims Realization of diffuse reflectance and reflectance/radiance factors standards Uncertainty from the non-lambertianity in standards Relation between coloured-objects BSDF and the spatial distribution of the chromatic coordinates Ciencia y Tecnología del color. Seminario 2009

Instrument description Ciencia y Tecnología del color. Seminario 2009

Instrument description Ciencia y Tecnología del color. Seminario 2009

Instrument description Ciencia y Tecnología del color. Seminario 2009

Instrument description Ciencia y Tecnología del color. Seminario 2009

Measurement procedure Direct Auxiliar System Irradiance, E Indirect Ciencia y Tecnología del color. Seminario 2009

CoordinatesTransformation X Z X Y A Source Spherical Coordinates BSDF i Degrees of freedom of experiment s i Z s Germer, 1999 Y Detector Ciencia y Tecnología del color. Seminario 2009

Fitting to a BSDF Model Model HTSG (He, Torrance, Sillion, Greenberg) (1991) Ideal specular Directional diffuse Uniform diffuse Fitting experimental data to a model 0, , BRDFud Ciencia y Tecnología del color. Seminario 2009

Future work Assessment of the angles for the proper characterization of the BSDF Determination of the characteristic parameters of the materials: 0, , BSDFud Relation between BSDF and object appearance: knowledge of object RADIANCE for every direction within the observer frame Ciencia y Tecnología del color. Seminario 2009

Gonio-Spectrophotometer for Low-Uncertainty Bidirectional Scatter Distribution Function (BSDF) Measurements A. M. Rabal, J. L. Fontecha, A. Ferrero, A. Pons, J. Campos y A. Corróns IFA-CSIC rabal@ifa.cetef.csic.es Ciencia y Tecnología del color. Seminario 2009