Results 251 to 260 of about 219,223 (311)

Deep-learning-based computer-generated hologram from a stereo image pair.

Optics Letters, 2022
We propose a deep-learning-based approach to producing computer-generated holograms (CGHs) of real-world scenes. We design an end-to-end convolutional neural network (the Stereo-to-Hologram Network, SHNet) framework that takes a stereo image pair as ...
Chenliang Chang, Di Wang, Dongchen Zhu, Jiamao Li, Jun Xia, Xiaolin Zhang   +5 more
semanticscholar   +1 more source

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

Computer-generated rainbow holograms

Applied Optics, 1984
A technique is described for synthetic generation of rainbow holograms. Minimization of the space–bandwidth product is discussed considering the reconstruction geometry. It is shown how the flexibility of computer-generated holography can be used to make compromises and solve particular problems peculiar to display applications. Artificially introduced
D, Leseberg, O, Bryngdahl
openaire   +2 more sources

Adaptive Computation of Computer-Generated Holograms

Advances in Imaging, 2008
Regular Effective Hologram Regions (EHRs) for object subspaces are pre-calculated. Object points are categorized online and the corresponding EHRs are used for hologram computation. The use of EHRs increases computational speed and benefits reconstruction quality.
Shuhong Xu, Farzam Farbiz, Sanjeev Solanki, Xinan Liang, Xuewu Xu   +4 more
openaire   +1 more source

Computer-generated double-phase holograms

Applied Optics, 1978
A method of computer generating binary holograms based on the decomposition of a complex value into two phase quantities is described. Each Fourier transform cell is divided into subcells, and phase quantities are encoded by the detour phase technique. Noise due to the displacement of the subcells and the phase coding is discussed.
C K, Hsueh, A A, Sawchuk
openaire   +2 more sources

Binary computer-generated holograms

Applied Optics, 1979
Binary computer-generated holograms are similar to interferograms with fringe patterns hardclipped by a photographic process. Therefore the fringe locations in the binary hologram can be determined by solving a grating equation. However, there are two difficulties in using this approach to make binary Fourier transform holograms.
openaire   +2 more sources

Polarization-selective computer-generated holograms

Optics Letters, 1993
We demonstrate polarization-selective computer-generated holograms with independent phase profiles for the two orthogonal linear polarizations. The holograms are made of two surface-relief-etched birefringent substrates joined face to face. We describe their design and fabrication and present experimental results for dual binaryphase computer-generated
J E, Ford, F, Xu, K, Urquhart, Y, Fainman   +3 more
openaire   +2 more sources

Disk hologram made from a computer-generated hologram

Applied Optics, 2009
We have been investigating disk holograms made from a computer-generated hologram (CGH). Since a general flat format hologram has a limited viewable area, we usually cannot see the other side of the reconstructed object. Therefore, we propose a computer-generated cylindrical hologram (CGCH) to obtain a hologram with a 360 deg viewable area.
Takeshi, Yamaguchi, Tomohiko, Fujii, Hiroshi, Yoshikawa   +2 more
openaire   +2 more sources

Binary computer-generated-hologram-based holographic data storage.

Applied Optics, 2019
Conventional computer-generated-hologram-based holographic data storage (CGH-HDS) needs to use a multilevel modulatable spatial light modulator (SLM). A binary SLM usually has a higher refresh rate than a multilevel one, and it enables HDS to increase ...
Naru Yoneda, Y. Saita, T. Nomura
semanticscholar   +1 more source