Abstract
A 3-D vision sensor and an algorithm for inspecting the dimensions of cylindrical bosses and holes of automotive parts have been developed. The algorithm measures the dimensions of the featured points of the bosses and the holes instead of their overall dimensions. The cross slit lights of the 3-D vision sensor are projected onto the bosses and the holes. The featured points are detected from the shapes of the reflected slit lights. From the 3-D coordinates of the featured points, the diameters and centers of the circles inscribed in the bosses and the holes. From these values, inclination, size and asymmetry of the bosses and the holes are obtained.
In the experiments, the accuracy of detecting the diameters and centers of the inscribed circles were ±0.30 mm. This result indicates the effectiveness of the sensor and the algorithm.
