Effects of illumination and inclination of test objects on the detectability of surface flaws.

In order to optimize the illumination of industrial visual testing and inspection workplaces, the limits of the detectability of 3-dimensional details have to be determined for different surfaces and lighting scenarios. For this reason, the influence of the inclination of samples on luminance and contrast was examined, and additionally laboratory tests were carried out to measure visual acuity when detecting flaws on the surfaces of different materials at various illuminations. The results were compared to the subjective assessment of test subjects (Ss) who participated in the laboratory tests. It turned out that all results are strongly dependent on the inclination of the samples rather than on the lighting scenarios applied. [ABSTRACT FROM AUTHOR]