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Vision Inspection Method Development which Improves Accuracy By using Power-Law Transformation and Histogram Specification  

Huh, Kyung-Moo (Dept. of Electronic Eng Dankook University)
Park, Se-Hyuk (Dept. of Electronic Computer Eng Dankook University)
Kang, Su-Min (Dept. of Electronic Computer Eng Dankook University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.44, no.5, 2007 , pp. 11-17 More about this Journal
Abstract
The appearance inspection of various electronic products and parts has been executed by the eyesight of human. But inspection by eyesight can't bring about uniform inspection result. Because the appearance inspection result by eyesight of human is changed by condition of physical and spirit of the checker. So machine vision inspection system is currently used to many appearance inspection fields instead of the checker. However the inspection result of machine vision is changed by the illumination of workplace. Therefore we have used a power-law transformation and histogram specification in this paper for improvement of vision inspection accuracy. As a result of these power-law transformation and histogram specification algorithm, we could increase the exactness of vision inspection and prevent system error from physical and spirit condition of human. Also this system has been developed only using PC, CCD Camera and Visual C++ for universal workplace.
Keywords
Power-law transformation; Histogram specification; Illumination; Accuracy;
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