A figure pattern expressing information to be embedded, or a position of an area in which the information to be embedded exists, is embedded in an area other than the background of image data, thereby generating image data embedded with a watermark. Then, the figure pattern is detected from the generated...http://www.google.fr/patents/US8160294?utm_source=gb-gplus-shareBrevet US8160294 - Electronic watermark embedment apparatus and electronic watermark detection apparatus
Electronic watermark embedment apparatus and electronic watermark detection ...
