The present invention provides a method and device for detecting the presence of logo patterns in product images. The method comprises the steps of retrieving one or more logo patterns from a logo pattern library, each of the one or more logo patterns identifying a respective product brand; retrieving a product image; calculating for each of the one or more logo patterns, a matching degree, the matching degree representing a degree to which each logo pattern is present in the product image; selecting as a selected logo pattern, the logo pattern having the greatest calculated matching degree; and determining that the product image includes the selected logo pattern if the matching degree of the selected logo pattern is greater than a first threshold.