Abstract
It is investigated and discussed how the defects on the outer-ring surface of bearing should be imaged and detected by the computer image processing technique with CCD camera and the Weber's law. After the analogue image of bearing's defect photographed by CCD camera changed the digital image at A/D converter and the binarization was done about the digital image using the Weber's law, the defects on bearing's surface were detected clearly. From the result of single regression analysis between the sensory value about the defect's grade by inspector and the measured defect's area was examined, there was a good agreement between the values calculated by this regression equation and the sensory value by inspectors.
