Construction and detection of digital holographic watermarks

Chau Jern Cheng, Li Chien Lin, Wen Tsun Dai

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

This study presents an optical watermarking scheme using a digital holographic technique. The digital holographic watermark is constructed by a modified Mach-Zehnder interferometric architecture and a constant-level embedding algorithm, and the watermark detection is optically implemented using VanderLugt 4-f correlator with a weighting matched filter. The detection procedure is a compromise between perceptual quality and correlation robustness, in which the weighting factor selection rule and optimal threshold for the watermarking scheme are given and analyzed. Additionally, the detected correlation is spatially separable and avoided interference from the cover image. Both analytical and experimental results are presented and discussed.

Original languageEnglish
Pages (from-to)105-116
Number of pages12
JournalOptics Communications
Volume248
Issue number1-3
DOIs
Publication statusPublished - 2005 Apr 1

Keywords

  • Digital holography
  • Optical correlator
  • Watermarking

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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