APPLICATION OF RING LIGHT IN AUTOMATIC SURFACE QUALITY INSPECTION
The most important factor for detecting defects in machine vision inspection is illumination. This paper describes the basic lighting concepts and lighting techniques for industrial applications of machine vision. In the paper analytical equations for illumination on the inspected objects using ring-light are determined. Application to the production line shows that ring-light illumination is an effective means of providing constant illumination and perfectly detects defects such as cracks when tested on a number of ceramic tiles with real defects.