Unevenly distributed image illumination is a problem in an automatic machine visual inspection system used for fiber connector defect detection. This unevenly distributed illumination makes it difficult to find an appropriate horizontal threshold to convert a gray-scale image to a binary image to separate surface defects, such as blobs and scratches, from the background of the connector. This paper proposes some effective methods to compensate the unevenly distributed illumination problem so that standard image processing methods can be used effectively to detect the defects of the fiber connectors.
© 2004 Optical Society of America
Yaguang Yang, "Illumination Compensation Methods for Automatic Fiber Connector Inspection," Appl. Opt. 43, 1349-1354 (2004)