The invention concerns a method and a device to determine a descriptor for a signal representing a multimedia item. The method comprises the step of applying to said signal a first bank of directional filters in order to obtain a first set of coefficients. According to the invention the method comprises...http://www.google.com/patents/US7730004?utm_source=gb-gplus-sharePatent US7730004 - Method and device to determine a descriptor for a signal representing a multimedia item, device for retrieving items in a database, device for classification of multimedia items in a database
