Large-scale nickel band width detection system based on machine vision

In order to achieve on-line high-precision detection of the total width of punching nickel-plated steel strip, a method based on computer vision and linear motor measurement has been proposed. High quality nickel tape images were collected by combining high-performance industrial cameras with telecentric lenses. And, the edge of the nickel belt was then obtained by using a sub-pixel algorithm. Meanwhile, by coordinating the linear motor trajectory and getting the partial images after two times, the total width can be get by combining the movement distances. An optimization compensation algorithm is proposed, which reduces the linear motor displacement error caused by the actual installation process and the temperature. The research showed that the system can detect the large width of the nickel tape with the total width effectively and stably. The accuracy was 0.035mm.