Shape recovery of anisotropic metal surfaces.
A method to recover the shape of metallic surfaces that have a directional microstructure is demonstrated. A simple model that shows how surface radiance varies with the azimuth of the light source is described and verified on real surfaces. The model predicts that if a light source is revolved around a flat facet then two peaks in radiance will be observed: tilting the facet against the grain of the material will cause the amplitudes of the peaks to change relative to one another; titling the facet with the grain will change the angles at which the peaks occur. It is shown that by measuring these effects, it is possible to estimate the slope of the facet within a limited range.
Carinthian Technical Research AG, Europastrasse 4/1, A-9524 Villach, Austria. gerald.mcgunnigle@ctr.at
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