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Transparent Robust Image Watermarking Mitchell D. Swanson, Bin Zhu, and Ahmed H. Tewfik

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... within a digital signal (such as image, video, audio, polygonal model... is integrated into the content of host signal itself, and requires no additional ... – PowerPoint PPT presentation

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Title: Transparent Robust Image Watermarking Mitchell D. Swanson, Bin Zhu, and Ahmed H. Tewfik


1
Transparent Robust Image WatermarkingMitchell D.
Swanson, Bin Zhu, and Ahmed H. Tewfik
  • Paper Report
  • Hsiao-Jung Chang
  • hchang08_at_ecs.syr.edu
  • NOV. 20, 2001

2
What is Watermark
  • is a hidden information within a digital signal
    (such as image, video, audio, polygonal model...)
  • is integrated into the content of host signal
    itself, and requires no additional file header or
    conversion of data format
  • is designed to permanently reside in the host
    data
  • unlike encryption, does not restrict access to
    the host data

3
Requirements of Watermark
  • Imperceptible
  • Undeletable
  • Statistically invisible
  • readily extracted
  • Capacity
  • Robustness

4
Watermarking Scheme
  • A watermarking scheme for images which exploits
    the human visual system to guarantee that the
    embedded watermark is imperceptible.
  • The image watermark is constructed by computing
    watermarks for individual image blocks.

5
Watermarking Approaches
  • Spatial Domain
  • LSB techniques
  • Pseudo-noise (PN) sequence
  • Patchwork
  • Frequency Domain
  • Discrete Cosine Transformation (DCT)
  • Wavelet Transformation

6
Watermarking Generation
7
Watermarking Detection
  • The embedded watermark is noise-like and its
    location (based on multiple blocks) is unknown
  • A different m-sequence is used for each block.
  • Any destruction attempts are done blindly
  • Detection of the watermarking is accomplished via
    hypotheses testing
  • H0 X R S N (No watermark)
  • H1 X R S W N (Watermark)
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