Results 211 to 220 of about 3,360 (241)
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Method for self reconstruction of holograms for secure communication
SPIE Proceedings, 2017We present the theory and experimental results behind using a 3D holographic signal for secure communications. A hologram of a complex 3D object is recorded to be used as a hard key for data encryption and decryption. The hologram is cut in half to be used at each end of the system.
Eric Donkor, Craig W. Babcock
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Large image reconstruction using small holograms
Applied Optics, 1989Large image reconstruction using a factor of 5 smaller hologram is realized with an optical system which consists of two Fresnel lenses and one common lens. The secondary Fresnel lens also serves as a projection screen. Furthermore, using the same optical system, a true color hologram is achieved by using three primary color lasers.
C S, Lh +3 more
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Controlling Images Parameters in the Reconstruction Process of Digital Holograms
IEEE Journal of Selected Topics in Quantum Electronics, 2004Digital holograms recorded with a charge-coupled device array are numerically reconstructed in amplitude and phase through calculation of the Fresnel-Kirchhoff integral. The flexibility offered by the reconstruction process in digital holography allows exploitation of new possibilities of application in microscopy. Through the reconstruction process we
Pietro Ferraro +5 more
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Acoustical Holograms and Optical Reconstruction
1969Theoretical and experimental investigations of the construction of acoustical holograms and the optical reconstruction of their images are described. The matrix representation of Gabor’s hologram is presented, and the matrix method is used to analyze the experimental results obtained.
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Real-time automatic reconstruction of digital holograms
Advances in Microscopic Imaging VA Python based real-time reconstruction algorithm independent of telecentricity and sample scattering was proposed for Digital Holographic Microscopy (DHM).
Müge Topcu, Serhat Tozburun
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Reconstruction of projection images from CCI holograms
International Conference on Acoustics, Speech, and Signal Processing, 2003The author introduces chrono-coherent imaging (CCI), a technique for noninvasive imaging of hidden structures at optical wavelengths, and discusses various aspects of CCI image formation from a signal processing perspective. Particular attention is given to the development of a mathematical model of the process, leading to image reconstruction and ...
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Reconstruction techniques of holograms from Spacelab 3
Applied Optics, 1987Fluid transport effects in a ground-based laboratory are fairly well known. Bouyancy driven transport occurs when there is a local density change in the fluid. In a low-g environment these density changes become less important, and other transport mechanisms dominate.
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Multi-object reconstruction of plankton digital holograms
Multimedia Tools and Applications, 2023Wenjie Hu +7 more
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An interference iterative reconstruction algorithm based on a single off-axis digital hologram
Optics and Lasers in Engineering, 2023Fengpeng Wang, Dayong Wang, Jia Yao
exaly