The present invention relates to detecting steganographically hiding images and information. In a preferred embodiment, an image is hidden within a media signal. The media preferably includes a cyan (C) color plane, a magenta (M) color plane, a yellow (Y) color plane and a black (K) color plane. In an...http://www.google.co.uk/patents/US6804377?utm_source=gb-gplus-sharePatent US6804377 - Detecting information hidden out-of-phase in color channels
