Results 231 to 240 of about 2,557,405 (292)

Computer-generated-hologram-based holographic data storage using common-path off-axis digital holography.

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
semanticscholar   +1 more source

Optical implementation of image encryption based on digital holography and computer generated hologram

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, Sixing Xi, Xiao-lei Wang, Liying Lang, Xueguang Wang, Lei Zhang, Haiyan Han, Zhao Dong, Xiao-xue Jiao, Huaying Wang, H. Zhai   +10 more
semanticscholar   +1 more source

Optical multimodal biometric encryption that uses digital holography

Journal of Optics, 2020
In 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
semanticscholar   +1 more source

Terahertz digital holography

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 ...
Wenfeng Sun, Yan Zhang, Xinke Wang, Ye Cui   +3 more
openaire   +2 more sources

Recent advances in self-interference incoherent digital holography

Advances in Optics and Photonics, 2019
Self-interference holography is a common technique to record holograms of incoherently illuminated scenes. In this review, we survey the main milestones in the topic of self-interference incoherent digital holography from two main points of view.
Joseph Rosen, A. Vijayakumar, Manoj Kumar, M. Rai, R. Kelner, Y. Kashter, Angika Bulbul, Saswata Mukherjee   +7 more
semanticscholar   +1 more source

Autofocusing in digital holography

SPIE Proceedings, 2013
Digital holography allows the acquisition of 3D profiles of objects. Digitally captured holograms are reconstructed at the respective distances of the objects to reveal the phase and the intensity profiles. However, computing an object’s 3D profile with only a single reconstruction requires prior knowledge of the distance of the object from the ...
Meriç Özcan, Hazar Aytekin İlhan, Mert Doğar   +2 more
openaire   +2 more sources

Photon counting digital holography

SPIE Proceedings, 2016
Digital holography uses electronic sensors for hologram recording and numerical method for hologram reconstruction enabling thus the development of advanced holography applications. However, in some cases, the useful information is concealed in a very wide dynamic range of illumination intensities and successful recording requires an appropriate ...
Hrvoje Skenderović, Nazif Demoli, Mladen Pavičić, Mario Stipčević   +3 more
openaire   +2 more sources

Stereoscopic Digital Holography

IEEE Transactions on Plasma Science, 2010
The ability to follow the motion of individual particles in a dusty plasma is essential for most experiments on complex plasmas. However, for 3-D particle clouds, the precise determination of all particle coordinates at once is a sophisticated task.
Lennart Muhlfeld, Dietmar Block, M. Kroll   +2 more
openaire   +2 more sources

Digital Hyperspectral Holography

Optoelectronics, Instrumentation and Data Processing, 2020
A 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
openaire   +2 more sources

Unconventional digital holography

Digital Holography and Three-Dimensional Imaging, 2013
Traditionally, holography requires coherent-light for object illumination and a reference beam for recording its 3-D information as a hologram. We explore the unconventional techniques for digital holography that avoid coherent-light and reference.
Wolfgang Osten, Dinesh N. Naik, Giancarlo Pedrini   +2 more
openaire   +2 more sources