Chinese Optics Letters, 2013, 11 (2): 021102, Published Online: Jan. 23, 2013
Improved illumination for vision-based defect inspection of highly reflective metal surface Download: 828次
110.0110 Imaging systems 120.0120 Instrumentation, measurement, and metrology 290.0290 Scattering 150.0150 Machine vision
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.
Lin Li, Zhong Wang, Fangying Pei, Xiangjun Wang. Improved illumination for vision-based defect inspection of highly reflective metal surface[J]. Chinese Optics Letters, 2013, 11(2): 021102.