Results 31 to 40 of about 3,360 (241)

Digital Fresnel Hologram Watermarking [PDF]

, 2010
We present a method of digital hologram watermarking using a Fresnel hologram of a real-world 3D object and the fractional Fourier transform. A watermark is encrypted using double random phase fractional Fourier domain encoding technique and then encoded
Tomi Pitkaaho, Naveen K. Nishchal, Pitkäaho, Tomi, Naughton, Thomas J., Nishchal, Naveen K., Thomas J. Naughton   +5 more
core   +1 more source

Magnetic Holography and Its Application to Data Storage

Photonics, 2021
The principle of magnetic holograms and its application to holographic memory are reviewed. A magnetic hologram was recorded through a thermomagnetic recording as a difference in magnetization direction and reconstructed with the magneto-optical effect ...
Yuichi Nakamura
doaj   +1 more source

Sound wave hologram and optical reconstruction

Proceedings of the IEEE, 1967
An acoustic hologram is constructed using a sound wave (20 kHz), scanning the acoustic fields by a microphone, and lighting a lamp by amplified electrical signals from the microphone. The original image is reconstructed to illuminate the sound wave hologram of reduced size by the laser light (6328 A) and observed by a microscope.
AOKI, Yoshinao, YOSHIDA, Norinobu, TSUKAMOTO, Nobuo, SUZUKI, Michio   +3 more
openaire   +1 more source

Dual wavelength digital holography for 3D particle image velocimetry [PDF]

Journal of the European Optical Society-Rapid Publications, 2015
A multi-exposure digital in-line hologram of a moving particle field is recorded by two different wavelengths and at different times. As a result, during the reconstruction step, each hologram can be independently and accurately reconstructed for each ...
Grare S., Coëtmellec S., Allano D., Grehan G., Brunel M., Lebrun D.   +5 more
doaj   +1 more source

Multiplane Optimizing Phase Holograms Using Advanced Machine Learning Algorithms and GPU Acceleration

Optics
Phase holography is a critical optical imaging and information processing technique with applications ranging from microscopy to optical communications.
Luz Hernández-Felipe, José Humberto Arroyo-Nuñez, César Camacho-Bello, Iván Rivas-Cambero   +3 more
doaj   +1 more source

Comparison of Laplacian differential reconstruction of inline holograms recorded at two different wavelengths and distances

, 2010
Paper presented at Biomedical Optics (BIOMED) Miami, Florida, April 11, 2010We record two holograms using two different illuminating wavelengths. Subtracting these holograms, the resulting reconstruction is an approximation to the second order Laplacian
Dayan Li, John T. Sheridan, Ryle, James P., Li, Dayan, James P. Ryle, Sheridan, John T.   +5 more
core   +1 more source

3D Reconstruction of unstained cells from a single defocused hologram

, 2022
We investigate the problem of 3D complex field reconstruction corresponding to unstained red blood cells (RBCs) with a single defocused off-axis digital hologram.
Mansi Butola (14832787), Sunaina Rajora (10021007), Kedar Khare (10021010)   +2 more
core   +1 more source

Digital Fourier Transform Holography Using a Beam Displacer

Engineering Proceedings, 2023
Fourier transform holography overcomes the phase recovery challenge through recording complex field information of the object in an interference pattern recorded at the far field, i.e., Fourier plane.
Mohit Rathor, Shivam Kumar Chaubey, Rakesh Kumar Singh   +2 more
doaj   +1 more source

Numerical reconstruction of hologram

, 2019
Numerical reconstruction for demonstrating the motion parallax with occlusion effect of the computer-generated ...
Hao Zhang (15339)
core   +1 more source

Sectional hologram reconstruction through complex deconvolution

, 2020
We propose a sectional hologram reconstruction method through complex deconvolution. By taking into account of both amplitude and phase (or real and imaginary parts) of wavefront propagation into the inverse problem model, we can perform more robust and ...
Lam, EY, Chen, N, Lee, B, Poon, TC
core   +1 more source