Visual Defect Inspection for Deep-Aperture Components With Coarse-to-Fine Contour Extraction

This paper investigates automatic quality inspection for the components with a small diameter and deep aperture. An automatic pick-and-place system is constructed, which employs an endoscope to achieve better image quality aiming at the characteristics of the component. A coarse-to-fine contour extraction algorithm with four steps is presented to inspect the component's quality. First, approximate...