30 August 2002 Coded holograms for anticounterfeiting using Fourier transform technique on dot-matrix holograms
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Abstract
A novel technique is proposed to fabricate coded holograms based on dot-matrix holograms for security applicaitons. Fourier transform and inverse Fourier transform are adopted in the coding process. The principle of the coding is to introduce a phase function into the reconstructed wave function of a dot-matrix hologram and record a new hologram. As the result of the coding, the new hologram not only preserves the pattern of the original dot-matrix hologram but also has 3D effect, which is resulted from the phase distribution on the hologram plane. Theoretical analysis and experimental results are presented.
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Shou Liu, Shou Liu, Xiangsu Zhang, Xiangsu Zhang, Chuan Liu, Chuan Liu, Pengpeng Zhu, Pengpeng Zhu, } "Coded holograms for anticounterfeiting using Fourier transform technique on dot-matrix holograms", Proc. SPIE 4924, Holography, Diffractive Optics, and Applications, (30 August 2002); doi: 10.1117/12.481502; https://doi.org/10.1117/12.481502
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