Measuring Surface Shape from Specular Reflection Image Sequence : Quantitative Evaluation of Surface Defects of Plastic Moldings

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.