1. A method for identifying repeated patterns in a strip-like product, the method comprising: observing the strip-like product by at least one camera; creating at least one digital image signal comprised of pixels for examination; searching for an anomaly comprised of one or more pixels in the image signal; creating a search image of any detected anomaly and its neighbourhood; using the search image to convolute the image signal being examined and creating a response image signal; using said created response image signal to determine image areas within the image signal being examined that are substantially similar to the search image; calculating distance lines between substantially similar image areas in the cross and longitudinal directions of the strip-like product; comparing the distance lines with each other and substantially longitudinal distance lines of substantially equal length and/or selecting substantially longitudinal distance lines having lengths that are substantially multiples of each other from among the distance lines; creating one or more pairs of distance lines from the selected distance lines, each of said pair of distance lines respectively consisting of two longitudinal distance lines; and selecting pairs of distance lines from among the created pairs so that the distance between the pairs of distance lines is substantially a multiple of the longitudinal length of the shorter distance line in the pair and the distance lines in the pairs are substantially close to each other in the cross direction of the strip-like product.