1. A method for identifying repeated patterns in a strip-like product in which method the strip-like product is observed by at least one camera and at least one digital image signal comprised of pixels is created for examination, wherein an anomaly comprised of one or more pixels is searched for in the image signal, a search image is created of any detected anomaly and its neighbourhood, the search image is used to convolute the image signal being examined, creating a response image signal; said response image signal is used to determine image areas within the image signal being examined that are substantially similar to the search image.