Construction and detection of digital holographic watermarks

Chau Jern Cheng, Li Chien Lin, Wen Tsun Dai

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)


    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
    Issue number1-3
    Publication statusPublished - 2005 Apr 1


    • 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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