Image scrambling without bandwidth expansion

  • Authors:
  • D. Van De Ville;W. Philips;R. Van de Walle;I. Lemahieu

  • Affiliations:
  • Biomed. Imaging Group, Swiss Fed. Inst. of Technol. Lausanne, Switzerland;-;-;-

  • Venue:
  • IEEE Transactions on Circuits and Systems for Video Technology
  • Year:
  • 2004

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Abstract

Image-scrambling schemes are designed to render the image content unintelligible. Wyner has proposed an elegant one-dimensional (1-D) scrambling scheme without bandwidth expansion, making use of the discrete prolate spheroidal sequences (DPSS). The DPSS are optimal regarding their energy concentration in a given frequency subband. In this paper, we propose the two-dimensional (2-D) extension and application of this algorithm. We discuss new possibilities introduced by the 2-D approach. We also include experimental results.