Image Watermarking


1. Introduction:

With the increasing importance and widespread distribution of digital media and imagery, the protection of the intellectual property rights of the owner for thei media has become increasingly significant. One of the types of media is digital imagery, which can be copied and widely distributed wihtout any significant loss of quality.

Image Watermarking is the process of embedding into an image some information which helps establish the ownership of the image.


2. Fundamental definitions :


3. Desirable qualities :

All embedding schemes must meet several requirements regarding the quality of the watermark. These may be enumerated as :

  1. The watermarked image should retain as closely as possible the quality of the original image.
  2. The watermark recovery process must be able to prove to a high degree of certainity that any image is actually a watermarked image, i.e. it should be resistant to showing 'false positives' when searching for watermarks in the image. Also if the image is watermarked then the extracted wateramrk should match only with the original watermark and not with any other randomly generated watermark.
  3. The watermark should be robust. The watermark should be able to retain a significant part of the watermark when a deliberate or non-deliberate attempt is made through various image processing techniques to remove or corrupt the watermark.


4. My Implementation :

Secure Spread Spectrum Watermarking of Images

References :

  1. Ingemar J. Cox, Joe Kilian, Tom Leighton, and Talal G. Shamoon.
    Secure spread spectrum watermarking for multimedia.
    In Proceedings of the IEEE ICIP '97, volume 6, pages 1673 - 1687,
    Santa Barbara, California, USA, 1997.

  2. S. Craver
    Can Invisible Watermarks Resolve Rightful Ownership?
    IBM Research Report, 1996, p. 5.
  3. Peter Meerwald's watermarking sources at www.cosy.sbg.ac.at/~pmeerw/




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