An image processing apparatus which efficiently perform image coding and digital watermark embedding, and decoding and digital watermark extraction. For this purpose, an image is transformed to plural frequency subbands, at least one of the plural frequency subbands is selected, and in the selected frequency...http://www.google.fr/patents/US20020172398?utm_source=gb-gplus-shareBrevet US20020172398 - Image processing apparatus and method, program code and storage medium
Image processing apparatus and method, program code and storage medium
