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<p><b>Abstract</b>—We propose a noncontact method for the measurement of surface shape and surface roughness. The method, which we call "four light photometric stereo," uses four lights, which sequentially illuminate the object under inspection, and a video camera for taking images of the object. The method has successfully been applied to a number of real objects.</p>
Photometric stereo, Torrance-Sparrow model, specular lobe, roughness, segmentation, shape, inspection.
Fredric Solomon, Katsushi Ikeuchi, "Extracting the Shape and Roughness of Specular Lobe Objects Using Four Light Photometric Stereo", IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 18, no. , pp. 449-454, April 1996, doi:10.1109/34.491627
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