ACCURATE DETECTION OF LOW-CONTRAST DEFECTS IN TRANSPARENT MATERIAL

摘要

This invention relates to a method and apparatus for detection of low-contrast defects in transparent materials such as plastics or glass. The method relies on the illumination of the material with a light producing a contrasting pattern, which accentuates defects. The method also includes the removal of the contrasting pattern either digitally with a pattern filtering algorithm or by the specific placement of the camera view. The apparatus involves one or many cameras positioned on one side of the material, one or many lights producing the desired pattern and positioned on the other of the material, and a computer or other computing device using an algorithm to process the image.

主权项

1. A method and apparatus for detecting low-contrast defects in transparent material comprising of:
A light projecting a contrasting pattern located on one side of the material, An area-scan or line-scan camera located at the opposite side of the material from the light and focused on the material, A computing device capable of processing images captured by the camera, An image processing algorithm.