Assessing motion-coherency in video watermarking

ABSTRACT

Motion coherent watermarking has been recently proposed as a means to combat temporal frame averaging along the motion axis (MC-TFA). The fundamental idea consists in exploiting motion-compensation primitives to force a physcal point of the scene to always carry the same watermark sample wherever it is projected in the video. However, for a given watermarking system, there is no simple tool to assess whether the produced watermark is motion-coherent or not. Today, this assessment relies on a computationally expensive procedure, namely (i) embed a watermark, (ii) perform the MC-TFA attack, (iii) check for the presence of the watermark. Therefore, the goal of this article is to provide the community with an efficient and accurate oracle which reports whether a video sequence contains any non-motion coherent component or not. This is done in practice by looking at the statistics of the difference between a frame and a motion predicted version of it.

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INDEX TERMS

Primary Classification:
  K. Computing Milieux
  K.4 COMPUTERS AND SOCIETY
      K.4.1 Public Policy Issues
          Subjects: Intellectual property rights

Additional Classification:
  I. Computing Methodologies
  I.4 IMAGE PROCESSING AND COMPUTER VISION
      I.4.9 Applications

  K. Computing Milieux
  K.6 MANAGEMENT OF COMPUTING AND INFORMATION SYSTEMS
      K.6.2 Installation Management
          Subjects: Benchmarks

General Terms:
Reliability, Security

Keywords:
motion coherency, oracle, video watermarking