Effect of dirty inspection surfaces on the accuracy of visual inspection

Effect of dirt on inspection surfaces on the accuracy of visual inspection
Relationship between dirt levels of inspection surface and defect locations. Credit: University of Electro-Communications

To supply high-quality products to the market, visual inspection by human senses is conducted in many manufacturing industries. It is generally recommended that visual inspection for a high-quality product be performed in a clean room.

However, in situations where the production process becomes more complex and more outsourcing in recent years, visual inspection is not often performed in a clean room because of constraints of existing equipment and economic problems.

Now, Ryosuke Nakajima at UEC Tokyo and colleagues at Aoyama Gakuin University have utilized to clarify experimentally the relationship between dirt levels of inspection surfaces and defect detection in visual inspection.

The experiment was a three step processes: analyze images of inspection surfaces in an actual factory and then create an inspection model for dirt density based on the pixel values of the images; design experiment using dirt levels of inspection surfaces, defect locations, and defect characteristics as experimental factors; examine the effects of these factors on the defect detection accuracy with 12 subjects.

A sudden reduction in the defect detection rate was observed as the inspection surface became dirtier.

The research shows the importance of a clean inspection surface for a highly accurate visual inspection process, and it is important to take measures such as making the in a and cleaning an inspection surface before the visual process.

More information: Ryosuke Nakajima et al. The Relationship between Dirt Levels of Inspection Surface and Defect Detection in Visual Inspection Utilizing Peripheral Vision, Industrial Engineering & Management Systems (2018). DOI: 10.7232/iems.2018.17.1.102

Citation: Effect of dirty inspection surfaces on the accuracy of visual inspection (2019, December 16) retrieved 12 July 2024 from https://techxplore.com/news/2019-12-effect-dirty-surfaces-accuracy-visual.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Explore further

Autonomous visual inspection of large-scale infrastructures using micro aerial vehicles (MAVs)


Feedback to editors