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This paper introduces a mathematical model which approximates the topographic shape of punctiform sink marks to a Gaussian-bell-like function. Such a model enables the description of sink mark shapes with few parameters, and the calculation of features which can be used to describe the visibility of the sink marks. The topography of test series of sink marks on black high-gloss plastic parts was measured...
Phase Measuring Deflectometry is used as a means to detect visually perceptible sink marks on the surfaces of injection molded parts. Discrete orthonormal polynomials are used for the regularized estimation and numerical differentiation of the measurement results which contain the first derivative of the part's surface. Since sink marks are perceived as local disturbances of surface curvature, image...
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