Digital Water Marking

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Digital Water Marking

  1. 1. Digital Watermarking<br />
  2. 2. Presentation Outline<br />Introduction<br />Types of Digital Watermarking<br />Types of Documents<br />Working Domain<br />Human Perspective<br />Application<br />
  3. 3. Introduction<br /> Digital Watermarking Technology<br />Allows - Embed Data - Digital Signals<br />Secret Message - Embedded - Cover message<br />Difficult to Remove<br />Knowledge - Secret Key – Allow - Extract<br />Text, Still Images,Video or Audio Data<br />Watermarking - Protect Copyright - Original Owner<br />Identification & Authentication <br />
  4. 4. Types of Digital Watermarking<br />
  5. 5. Types Of Documentation<br />
  6. 6. Types Of Documentation<br />
  7. 7. Types of Digital Watermarking<br />MP3Stego: WAV -> MPEG-3 + additional Data<br />Temporal masking<br />– 5-20ms before a loud signal<br />– 50-200ms after a loud signal<br />
  8. 8. Types Of Documentation<br />
  9. 9. Types Of Documentation<br />
  10. 10. Types of Digital Watermarking<br />
  11. 11. Types of Digital Watermarking<br />
  12. 12.
  13. 13.
  14. 14.
  15. 15. Watermarking life-cycle phases<br />
  16. 16. Steps in Watermarking<br />Embedding<br /><ul><li>Information embedded - digital watermark
  17. 17. Signal where the watermark - embedded - host signal
  18. 18. In embedding, an algorithm accepts host &data -embedded &</li></ul> produces a watermarked signal.<br />Attack<br />During transmission, If this person – modification - called attack.<br />Detection<br />Algorithm applied - attacked or unmodified signal - attempt extract watermark<br />
  19. 19. Working Domain<br />Spatial Domain<br />Methods use block x block based watermarking.<br />e.g. embed watermarks - randomly selected 8x8 blocks pixels - image.<br />Frequency domain<br />Embed a watermark, frequency transformation - applied - host data<br />Modifications - transform coefficients<br />Possible frequency image transformations -Discrete Fourier Transform<br />
  20. 20. Human Perspective<br />Visible watermark:<br /> Information visible - text or logo -identifies - owner - media.<br />
  21. 21. Human Perspective<br />Invisible watermark:<br />Invisible watermark - embedded image - cannot be perceived - human’s eyes<br /> Intended -prevent or deter unauthorized copying - digital media.<br />
  22. 22. Invisible Watermarking<br />
  23. 23. Visible Watermarking<br />
  24. 24. A watermark may be:<br /><ul><li>Fragile: distorted or broken under slight changes
  25. 25. Semi-fragile: designed -break under allchanges - exceed user-specified threshold
  26. 26. Robust: withstand moderate - severe signal processing attacks (compression,rescaling,filtering)</li></li></ul><li>Application<br />Copyright protection<br />Most prominent application<br />Embed information - owner - prevent others -claiming copyright<br />Require very high level of robustness<br />2. Copy protection<br />Embed watermark -disallow unauthorized copying -cover<br />E.x. compliant DVD player -not playback or copy data - carry “copy never” watermark<br />3. Content Authentication<br />Embed watermark - detect modifications - cover<br />Watermark - low robustness, “fragile”<br />
  27. 27. Application<br />4. Transaction Tracking<br />Embed watermark - convey information - legal recipient – cover<br />Useful - monitor or trace back illegally produced copies – cover<br />Referred as “fingerprinting”<br />5. Broadcast Monitoring<br />Embed watermark - cover & use automatic<br />Monitoring - verify whether cover -broadcasted as agreed<br />
  28. 28. Conclusion<br /> Digital watermarking focuses on embedding information inside a digital object such that the embedded information is in separable bound to the object.<br />
  29. 29. References<br />www.google.com<br />www.wikipedia.org<br />www.scribd.com<br />www.clic2c.com<br />www.youtube.com<br />

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