An apparatus for embedding secret information in an image signal transmitted with a shape signal showing the shape of an object is described. This apparatus comprises an embedding position decision unit for deciding a position in the object where the secret information is to be embedded, according to...http://www.google.co.uk/patents/US6334187?utm_source=gb-gplus-sharePatent US6334187 - Information embedding method, information extracting method, information embedding apparatus, information extracting apparatus, and recording media
