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Abstract
A novel technique has been developed for the textural analysis of Lambertian surfaces, while in the presence of a variable albedo. The method has direct application for the surface quality determination of cosmetically sensitive components, and has particular application where more traditional methods may prove unsatisfactory. A photometric stereo technique is used to facilitate the isolation of localised irregular features, such as scratching, indentations or small protrusions, which may be obscured by a coincident, regular or random surface albedo. A generic lighting arrangement is employed, which obviates the need for a customised lighting configuration. This represents a significant advantage for the configuration of industrial vision based inspection systems. Promising experimental results have been obtained using example components, and are presented in the paper.
Key words: Surface texture, Photometric stereo, Bump mapping.
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