Effect of bright and shade, and luminance difference of defect on defect detection in appearance inspection utilizing peripheral vision

摘要

This study considers the effect of bright and shade, and luminance difference of defects on defect detection in appearance inspection utilizing peripheral vision experimentally. Specifically, bright and shade of defect, luminance difference of defect, surface luminance of defect (evaluation index of the difficulty of defect detection, which was proposed in the previous study), and location of defect are designed as experimental factors, and their effects on defect detection rate are evaluated. As a result, it is clarified that the defect detection rate of the shade defects is lower than that of the bright defects, even if the surface luminance is at an identical level. It is also clarified that the defect detection rate of the luminance difference of 10 cd/m(2) becomes lower even if the surface luminance is at an identical level. Furthermore, these two trends are particularly remarkable for defects detected in the peripheral vision. Based on the results, in actual appearance inspection utilizing peripheral vision, it is necessary to take measures to detect the shade defects and/or the luminance difference of approximately 10 cd/m(2).