Classifying wood-surface features using dichromatic reflection

Alberto G. Maristany; Patricia K. Lebow; Charles C. Brunner; David A. Butler; James W. Funck

doi:10.1117/12.144044

12 May 1993 Classifying wood-surface features using dichromatic reflection

Alberto G. Maristany, Patricia K. Lebow, Charles C. Brunner, David A. Butler, James W. Funck

Proceedings Volume 1836, Optics in Agriculture and Forestry; (1993) https://doi.org/10.1117/12.144044
Event: Applications in Optical Science and Engineering, 1992, Boston, MA, United States

Abstract

The dichromatic reflection paradigm describes light reflection from optically inhomogeneous materials as the sum of body (diffuse) and interface (specular) reflections. Interface reflection represents unaltered light reflected from a material's surface. Body reflection represents light altered by the material's pigments and thus may provide information about the identity of the material. Wood is an optically inhomogeneous material that is also anisotropic. This latter property adds further complexity to the analysis of wood-surface images by creating localized magnitude differences in interface reflection as surface texture and fiber orientation change. This paper presents the results of a study that tested whether the use of only the body component of reflected light can significantly improve the classification of wood-surface features. To this end, reflectance curves of various Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) veneer features were separated into body and interface components, and their dimensionality reduced to a small number of basis function. Two discriminant functions, one constructed from body reflectances and the other from total reflectances, were then developed from the reduced reflectance data. The performance of the two discriminant functions were compared by classifying a new set of wood-feature spectral reflectances with each discriminant function.

Citation Download Citation

Alberto G. Maristany, Patricia K. Lebow, Charles C. Brunner, David A. Butler, and James W. Funck "Classifying wood-surface features using dichromatic reflection", Proc. SPIE 1836, Optics in Agriculture and Forestry, (12 May 1993); https://doi.org/10.1117/12.144044

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