Automated Inspection of Card Holes for Inserted Leads
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
An analysis routine is described that utilizes video grayscale image data and processes the image to determine the presence or absence of leads in a hole of a printed circuit card by analyzing the shape of the hole. The routine is based on the fact that the holes in a printed circuit card are round, and that any lead present in the hole "spoils" the roundness of the hole. The image of a hole at a given threshold is an empty circular area surrounded by a bright region (the copper pad on the printed circuit card.