Optical Approach for Suppressing Over-detection in Surface Inspection for High Strength Steel Sheets

In a process of manufacturing thin steel sheets such as for automobiles, it is common to install and use optical surface inspection system using light source cameras that receives regular reflection non-regular with properly settled incident observation angles. However, getting more difficult automobile which are being promoted high tensile strength safety. For example, harmless glittering glossy parts existing on the sheet detected mistakenly recognized harmful defect, called over-detection, or large amount over-detection interferes proper inspection. That reason why conventional technologies could not be applied parts.