A Study on the Effect of Luminance of Inspection Surface on Defect Detection in Visual Inspection utilizing Peripheral Vision

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  • 周辺視野を活用した目視検査における検査対象面の輝度が欠点検出に及ぼす影響に関する研究
  • シュウヘン シヤ オ カツヨウ シタ モクシ ケンサ ニ オケル ケンサ タイショウメン ノ キド ガ ケッテン ケンシュツ ニ オヨボス エイキョウ ニ カンスル ケンキュウ

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<p>This study focuses on differences of luminance of an inspection surface due to inspection environment, and considers experimentally the effect of luminance of inspection surface on defect detection in visual inspection utilizing peripheral vision. In the experiment, the luminance of inspection surface, defect locations, and defect characteristics (luminance contrast and size) are designed as experimental factors, and their effect on defect detection rate is evaluated. As a result, it is clarified that the defect detection rate is low in a case that the luminance of the inspection surface is 50 cd/m2 and the rate increases in a case that the luminance is between 100 cd/m2 and 250 cd/m2 regardless of the viewing area where the defect exists. In particular, it is found that the tendency is remarkable in a case that the surface luminance of defect (evaluation index of visibility of defects that was proposed in previous study) is between 0.21 and 0.34. From the above, in order to realize highly accurate visual inspection, it is necessary to control appropriately inspection environment according to the surface luminance of acceptable limit of defect.</p>

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