Abstract
A machine vision system for automatic inspection of keyboards is described. The system verifies that each location on a keyboard contains the correct, properly oriented key and that the graphics are not badly distorted. The graphics are inspected on the top and front surface of keys that vary widely in color, contour, surface texture and graphic content. Economical solutions are presented to a number of problems related to the design of the system's mechanics, optics, illumination, data reduction, pattern location and graphics discrimination. Operating procedures for training and running the system are also presented along with preliminary results.
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