Can Seam Diagnosis from Still Image Processing

In this work a machine vision system for inspection (VSI) is presented whose capabilities are able to detect seaming defects in metal cans for fishing food. Conventional method for quality inspection of seaming for cans, and their main dimensional features, are firstly shown. Then, the structure and algorithms for VSI are proposed for this application. This VSI is currently mounted over a conveyor belt for onlinelin-process inspection of metal cans, in order to assure their conformance to the given seaming requirements by detecting malfunctions of closing machines and logistic process failures. 1.1 Can Seaming Process In the can seaming process (Fig. I), a lid is mounted on the can body filled with ingredient, then body and lid are held between chuck and lifter, and then rotated before the lid is pressed against the seaming roll to carry out seaming. There are two types of seaming roll (double seaming mechanism): 1st roll and 2nd roll. The first roll approaches the can lid, and rolls up the lid curl and body flange sections of the can before retreating. Next, the second roll approaches to compress the rolled-up sections to end the seaming. In other words, the 1st roll rolls up the can lid and can body, doing mainly the bending work, while the 2nd roll compresses the rolled-up sections, and mainly does the seaming work.