Bijan G. Mobasseri, Yimin Zhang, Moeness G. Amin, and Behzad M. Dogahe

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Bijan G. Mobasseri, Yimin Zhang, Moeness G.
Amin, and Behzad M. Dogahe Center for Advanced
Communications Villanova University, Villanova,
PA 19085, USA
DESIGNING ROBUST WATERMARKS USING POLYNOMIAL
PHASE EXPONENTIALS

• Overview
• We propose a known-host-state methodology for
  designing image watermarks that are particularly
  robust to compression.
• This approach outperforms traditional spread
  spectrum watermarking across all JPEG quality
  factors .
• The fundamental approach uses 2D chirps as
  spreading functions, allowing spectrally shaping
  the chirp to match image content and JPEG
  compression.

Advantage Over Spread Spectrum

• SS sequences have excellent correlation
  properties but lack any degree of tuning.
• The chirp, on the other hand, can be spectrally
  tuned by selecting different