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Subtraction digital holography
Applied Optics, 2003Overlapping of the desired (first-order) and undesired (zero-order) terms originating from the recorded primary-fringe patterns in digital holography is a problem without a real-time solution. We propose a procedure for suppressing the zero-order disturbance that is realizable in real time.
Demoli, Nazif +2 more
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Comparative digital holography
Optics Letters, 2002We described a method for direct holographic comparison of the shape or the deformation of two objects when it is not necessary that both samples be located at the same place. In contrast to the well-known incoherent techniques based on inverse fringe projection, this new approach uses a coherent mask that is imaged onto a sample object that has a ...
Wolfgang, Osten +2 more
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Recent progress in digital holography with dynamic diffractive phase apertures [Invited].
Applied Optics, 2021Digital holography with diffractive phase apertures is a hologram recording technique in which at least one of the interfering waves is modulated by a phase mask.
Joseph Rosen, Nathaniel Hai, M. Rai
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DIGITAL HYPERSPECTRAL HOLOGRAPHY
Автометрия, 2020A method and an optical scheme for recording digital hyperspectral holograms in the light of an incoherent source are considered. The optical scheme includes an interferometer with a scanning mirror for generating reference waves. The set of complex amplitudes of the object field is calculated by Fourier transform of the interferograms in each pixel of
S. G. Kalenkov, G. S. Kalenkov
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Journal of Optics, 2020
An experimental implement method of optical image encryption based on digital holography and computer generated hologram (CGH) is proposed in this paper.
Nana Yu +10 more
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An experimental implement method of optical image encryption based on digital holography and computer generated hologram (CGH) is proposed in this paper.
Nana Yu +10 more
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Optical multimodal biometric encryption that uses digital holography
Journal of Optics, 2020In this paper, we propose an optical multimodal biometric encryption technique which uses digital holography (DH) for multiple biometric recording and successive optical encryption methods, by means of keys generated from biometric data.
S. Rajput, O. Matoba
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Time-averaged digital holography
Optics Letters, 2003We demonstrate that it is possible to study the modal structures of a vibrating object with digitally recorded holograms by use of the time-averaging principle. We investigate the numerical reconstruction from a theoretical point of view, and we show that the numerically reconstructed object from a digital hologram is modulated by the zeroth-order ...
Pascal, Picart +3 more
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Optics Letters, 2020
A reconstruction method for multilevel complex encoded data-pages is proposed to increase the recording density of computer-generated-hologram-based holographic data storage by using off-axis digital holography. Although the detection process is based on
Naru Yoneda, Y. Saita, T. Nomura
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A reconstruction method for multilevel complex encoded data-pages is proposed to increase the recording density of computer-generated-hologram-based holographic data storage by using off-axis digital holography. Although the detection process is based on
Naru Yoneda, Y. Saita, T. Nomura
semanticscholar +1 more source
Phase-shifting digital holography
Optics Letters, 1997A new method for three-dimensional image formation is proposed in which the distribution of complex amplitude at a plane is measured by phase-shifting interferometry and then Fresnel transformed by a digital computer. The method can reconstruct an arbitrary cross section of a three-dimensional object with higher image quality and a wider viewing angle ...
I, Yamaguchi, T, Zhang
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SPIE Proceedings, 2012
Terahertz wave (THz, also name T-Ray) belongs to far-infrared electromagnetic radiation. Since its unique properties, THz techniques have been paid more and more attentions during the past decades. In this field, THz digital holography is an important research branch, which can accurately extract three-dimensional optical information of objects ...
Xinke Wang +3 more
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Terahertz wave (THz, also name T-Ray) belongs to far-infrared electromagnetic radiation. Since its unique properties, THz techniques have been paid more and more attentions during the past decades. In this field, THz digital holography is an important research branch, which can accurately extract three-dimensional optical information of objects ...
Xinke Wang +3 more
openaire +1 more source