17 November 2010 Multi-image hiding method based on polarization multiplexing digital holography
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Abstract
A novel algorithm of multi-image hiding method is presented based on polarization multiplexing digital holography (PMDH). In our single wavelength PMDH scheme, four beams, two p-polarized beams and two s-polarized beams, are formed by two Polarization Beam Splitters (PBS) in the Mach-Zehnder interferometer. Then two different object waves with mutually orthogonal polarization states interfere corresponding reference waves respectively. Therefore two objects can be acquired from the compound holography recorded by CCD with proper incident angle between two reference beams simultaneously. The hologram storing multi-image is then superposed on the discrete-cosine-transform (DCT) domain of the content image, and the extraction process only requires the watermarked image without content image. Simulation results also demonstrate that the embedded multi-image can be successfully extracted under different kinds of attacks.
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Zhuqing Zhu, Shaotong Feng, Shouping Nie, Jiajie Zhang, "Multi-image hiding method based on polarization multiplexing digital holography", Proc. SPIE 7848, Holography, Diffractive Optics, and Applications IV, 784825 (17 November 2010); doi: 10.1117/12.869844; https://doi.org/10.1117/12.869844
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