A Stochastic Approach to Content Adaptive Digital Image Watermarking

  • Sviatoslav Voloshynovskiy
  • Alexander Herrigel
  • Nazanin Baumgaertner
  • Thierry Pun
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1768)

Abstract

This paper presents a new stochastic approach which can be applied with different watermark techniques. The approach is based on the computation of a Noise Visibility Function (NVF) that characterizes the local image properties, identifying textured and edge regions where the mark should be more strongly embedded. We present precise formulas for the NVF which enable a fast computation during the watermark encoding and decoding process. In order to determine the optimal NVF, we first consider the watermark as noise. Using a classical MAP image denoising approach, we show how to estimate the ”noise”. This leads to a general formulation for a texture masking function, that allows us to determine the optimal watermark locations and strength for the watermark embedding stage. We examine two such NVFs, based on either a non-stationary Gaussian model of the image, or a stationary Generalized Gaussian model. We show that the problem of the watermark estimation is equivalent to image denoising and derive content adaptive criteria. Results show that watermark visibility is noticeably decreased, while at the same time enhancing the energy of the watermark.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Sviatoslav Voloshynovskiy
    • 1
  • Alexander Herrigel
    • 2
  • Nazanin Baumgaertner
    • 2
  • Thierry Pun
    • 1
  1. 1.Department of Computer ScienceCUI - University of GenevaGeneva 4Switzerland
  2. 2.DCT – Digital Copyright Technologies, Research & DevelopmentZurichSwitzerland

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