Eye On Inspection

• Brian Ivens, president, Arpeco: There are two primary types of cameras used to acquire images in a vision inspection system. The array-based camera takes a snap-shot of the web and then sends the entire data to be processed in real time. With this type of system, maximum web speed can be limited due to the amount of image data to be processed based on camera resolution, and the size and type of defects to be detected. Also, web flutter and illumination can be issues as the entire image must be presented flat to the camera and lighted uniformly for image acquisition. This system does have an advantage—during start and stop operations as image capture occurs at intervals.