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Watermarking

Watermarking. Matt Elliott Brian Schuette. Overview. Goals Methods Comparison Attacks References. Watermark Goals Robust Invisible Recovery. Project Goals Watermark Types Fragile Robust Techniques Frequency Domain Spatial domain. Goals. Bit-Plane Slicing. Spatial Domain

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Watermarking

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  1. Watermarking Matt Elliott Brian Schuette

  2. Overview • Goals • Methods • Comparison • Attacks • References

  3. Watermark Goals Robust Invisible Recovery Project Goals Watermark Types Fragile Robust Techniques Frequency Domain Spatial domain Goals

  4. Bit-Plane Slicing • Spatial Domain • LSB contains watermark • Simple detection • Many options • Image blocks • Encode Text • Specific Areas

  5. seed random vector generator Original image marked image wmk N largest coeff. IDCT & normalize 2D DCT sort v’=v (1+ w) other coeff. Cox Method • Frequency Domain • Transformation • AC Coefficients • Sorted by size • Largest 1000 selected • Psuedo-random watermark embedded • Reverse transformation

  6. Comparison • Fragile Watermark • Very susceptible to attack • Used for tampering detection • Robust Watermark • Resistant to tampering • Used with public images • Provides proof of ownership

  7. Bit-Plane Slicing

  8. Methods of Attack • Scaling • Cropping • JPEG • Print/Xerox

  9. References • ECE 738 Advanced Digital Image Processing • Professor Hu • Wikipedia • Digital Image Processing, Gonzalez and Woods • I. Cox, J. Kilian, T. Leighton, T. Shamoon: “Secure Spread Spectrum Watermarking for Multimedia'', IEEE Transaction on Image Processing, vol.6, no.12, pp.1673-1687, 1997.

  10. Questions?

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