A digital watermark

@article{Schyndel1994ADW,
  title={A digital watermark},
  author={Ron G. van Schyndel and Andrew Z. Tirkel and Charles F. Osborne},
  journal={Proceedings of 1st International Conference on Image Processing},
  year={1994},
  volume={2},
  pages={86-90 vol.2}
}
The paper discusses the feasibility of coding an "undetectable" digital water mark on a standard 512/spl times/512 intensity image with an 8 bit gray scale. The watermark is capable of carrying such information as authentication or authorisation codes, or a legend essential for image interpretation. This capability is envisaged to find application in image tagging, copyright enforcement, counterfeit protection, and controlled access. Two methods of implementation are discussed. The first is… 

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