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Proceedings Paper

Definition of the requirements for the lighting and optics for a vision system used in order to measure mechanical parts with high accuracy
Author(s): Aldo Salvi
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Paper Abstract

The generalization of quality assurance system and the automation of the manufacturing processes generate more and more demand for dimensional control applications, based on vision systems. The required precision is typically in the region of the micron, for an object size of some millimeters. As a first approximation, the resolution of a vision system is defined by the optical field of view, divided by the number of pixels of the camera. (A subpixel- interpolation factor is also considered.) In theory, increasing the quantity of pixels will increase the resolution. This approach is true if the image formed on the CCD of the camera is an accurate reproduction of the object to measure. In order to form this image, it is necessary to -- (1) illuminate the object: lighting; (2) form the image of the object: measurement optics. The inaccuracies generated by these two factors determines the precision of the measurement. This survey has for a goal to determine the requirements of the lighting and of the measurement optics systems, in order to allow a maximum measurement precision of the part under test (PUT).

Paper Details

Date Published: 26 August 1996
PDF: 9 pages
Proc. SPIE 2785, Vision Systems: New Image Processing Techniques, (26 August 1996); doi: 10.1117/12.248552
Show Author Affiliations
Aldo Salvi, ISMECA SA (Switzerland)


Published in SPIE Proceedings Vol. 2785:
Vision Systems: New Image Processing Techniques
Philippe Refregier, Editor(s)

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