Geometrically invariant image watermarking using Polar Harmonic Transforms

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27240%2F12%3A86092941" target="_blank" >RIV/61989100:27240/12:86092941 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.ins.2012.02.062" target="_blank" >http://dx.doi.org/10.1016/j.ins.2012.02.062</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.ins.2012.02.062" target="_blank" >10.1016/j.ins.2012.02.062</a>

Result language
angličtina
Original language name
Geometrically invariant image watermarking using Polar Harmonic Transforms
Original language description
This paper presents an invariant image watermarking scheme by introducing the Polar Harmonic Transform (PHT), which is a recently developed orthogonal moment method. Similar to Zernike moment (ZM) and pseudo-Zernike moment (PZM) approaches, PHT is defined on a circular domain. The magnitudes of PHTs are invariant to image rotation and scaling. Furthermore, the PHTs are free of numerical instability, so they are more suitable for watermarking. In this paper, the invariant properties of PHTs are investigated. During embedding, a subset of the accurate PHTs are modified according to the binary watermark sequence. Then a compensation image is formatted by reconstructing the modified PHT vector. The final watermarked image is obtained by adding the compensation image to the original image. In the decoder, the watermark can be retrieved from the magnitudes of the PHTs directly. Experimental results illustrate that the proposed scheme outperforms ZM/PZM based schemes in terms of embedding cap
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
IN - Informatics
OECD FORD branch
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Publication year
2012
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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