A sensitive method for surface shape perception based on image sequence processing is developed. Utilizing a moving slit light source, defects on a plane plastic injection molding are visualized as deformation of the slit image through specular reflection. By considering the geometric configuration of the light source, a plastic test piece and a video camera, the distributions of surface inclination and surface undulation are evaluated quantitatively.
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Miike et al. (1995) studied this question.
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