Share Email Print
cover

Proceedings Paper

Reflectance variability of surface coatings reveals characteristic eigenvalue spectra
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

We have examined the trial-to-trial variability of the reflectance spectra of surface coatings containing effect pigments. Principal component analysis of reflectances was done at each detection angle separately. A method for classification of principal components is applied based on the eigenvalue spectra. It was found that the eigenvalue spectra follow characteristic power laws and depend on the detection angle. Three different subsets of principal components were examined to separate the relevant spectral features related to the pigments from other noise sources. Reconstruction of the reflectance spectra by taking only the first subset indicated that reflectance variability was higher at near-specular reflection, suggesting a correlation with the trial-to-trial deposition of effect pigments. Reconstruction by using the second subset indicates that variability was higher at short wavelengths. Finally, reconstruction by using only the third subset indicates that reflectance variability was not totally random as a function of the wavelength. The methods employed can be useful in the evaluation of color variability in industrial paint application processes.

Paper Details

Date Published: 15 October 2012
PDF: 12 pages
Proc. SPIE 8495, Reflection, Scattering, and Diffraction from Surfaces III, 849514 (15 October 2012); doi: 10.1117/12.929926
Show Author Affiliations
José M. Medina, Univ. do Minho (Portugal)
José A. Díaz, Univ. de Granada (Spain)
Rui Barros, Univ. do Minho (Portugal)


Published in SPIE Proceedings Vol. 8495:
Reflection, Scattering, and Diffraction from Surfaces III
Leonard M. Hanssen, Editor(s)

© SPIE. Terms of Use
Back to Top