STEGANOGRAPHIC ENCODING AND DECODING

8,908,908

12/9/2014 12:00:00 AM

This patent document relates generally to steganography and digital watermarking. One claim recites a method of encoding auxiliary information in an image or video comprising: determining watermark tweaks for attributes of image or video samples to encode auxiliary information in the image or video; and, using a programmed electronic processor, altering color values of the image or video samples to convey the watermark tweaks. The altering alters color values based at least in part on both: i) visibility of color value alterations, and ii) anticipated watermark detection. Of course, other claims and combinations are provided too.