The measurement of 3-D coordinates for many line-like objects.

概要

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We had reported a method which uses shadow information with one point light source, to measure the 3-D position of wire tips. However, a disadvantage of this method is that it cannot determine the pair, the image of the tips and the corresponding shadow of this tips, when the lens focus, the point light source and more than one tip are in the same plane. Therefore, it was difficult to measure the 3-D position of terminals in some cases. In order to measure the 3-D position of many line-like objects, a new vision system which use two point light sources has been developed. An algorithm that uniquely determines the corresponding pair of terminals is also developed. Therefore we obtain a general method to measure the 3-D position of wire tips. The accuracy of measurement is also improved, because the 3-D position of the terminals is calculated by the cross-point of three lines.<BR>According to the corresponding pairs of the terminals, we determine the corresponding pairs of the line. Based on the fact that the corresponding image pair of the points on the line and the image of the point light source are collinear, we can calculate the 3-D position of any point on the line, and then the orientation of the line.<BR>Finally, the experimental results are shown.