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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TOWARDS A ROBUST DIGITAL WATERMARK

The feasibility of coding a robust, undetectable, digital water mark on a standard 512*512 intensity image with an 8 bit gray scale and some constructions to extend this work to two dimensions are discussed.

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This paper discusses the feasibility of coding a robust, undetectable, digital water mark on a standard 512*512 intensity image with an 8 bit gray scale and discusses compatibility of the technique with JPEG image transmission.

Image watermarking-a spread spectrum application

The feasibility of coding a robust, undetectable, digital watermark on a standard 512*512 intensity image with an 24 bit RGB format, capable of carrying such information as authentication or authorisation codes, or a legend essential for image interpretation is discussed.

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A Short Summary of Digital Watermarking Techniques for Multimedia Data

The desirable characteristics of digital watermarking are outlined and several recent approaches that address these issues are also discussed.

Digital watermarking by DCT coefficient manipulation

The expectation and variance of the correlation between the investigated image and the watermark is derived, from which the performance of the spread spectrum watermarking algorithm is analyzed and is found to be consistent with the experiment results.

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DIGITAL WATERMARKING WITH A NEW ALGORITHM

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...

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