Abstract
Specular and strong reflections are the main problems encountered during part image
defect inspection of shiny or highly reflective surfaces. In this letter, we propose an improved
illumination method for defect inspection. A diffuse light source is designed based on the physics
analysis of light reflection. The distribution of intensity is simulated according to a known model
to verify the illumination uniformity of the source. Experiments show that defect expressivity when
using the proposed illumination method has a better performance. The optical model is not only
suitable for the defect detection of metal balls but also for the defect detection of planes and
cylinders.
© 2013 Chinese Optics Letters
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