Results 41 to 50 of about 1,828 (164)

Error correction of a phase-only computer-generated hologram for an aspheric surface [PDF]

Journal of the European Optical Society-Rapid Publications, 2014
When applying phase-only computer-generated hologram (CGH) as a standard model of optical measurement in computer-generated holography for aspheric surface testing, it has the advantage of simplifying optical path configuration and improving the ...
Zhang H., Yan Y., Zhou H., Qiao Y. J., Si J., Wang D.   +5 more
doaj   +1 more source

An Image Encryption Scheme of Logistic Modulation Using Computer-Generated Hologram and Chaotic Map

Journal of Electrical and Computer Engineering, 2018
We introduce an image encryption method based on computer-generated hologram (CGH) and two-dimensional Sine Logistic modulation map (2D-SLMM). We combine CGH and 2D-SLMM to improve encryption security. During the encryption process, the hologram needs to
Hui Ren, Jun Wang, Qiong-Hua Wang
doaj   +1 more source

Generating Multi‐Depth 3D Holograms Using a Fully Convolutional Neural Network

Advanced Science
Efficiently generating 3D holograms is one of the most challenging research topics in the field of holography. This work introduces a method for generating multi‐depth phase‐only holograms using a fully convolutional neural network (FCN).
Xingpeng Yan, Xinlei Liu, Jiaqi Li, Yanan Zhang, Hebin Chang, Tao Jing, Hairong Hu, Qiang Qu, Xi Wang, Xiaoyu Jiang   +9 more
doaj   +1 more source

Scaling of Three-Dimensional Computer-Generated Holograms with Layer-Based Shifted Fresnel Diffraction

Applied Sciences, 2019
Holographic three-dimensional (3D) displays can reconstruct a whole wavefront of a 3D scene and provide rich depth information for the human eyes. Computer-generated holographic techniques offer an efficient way for reconstructing holograms without ...
Hao Zhang, Liangcai Cao, Guofan Jin
doaj   +1 more source

Non-convex optimization for inverse problem solving in computer-generated holography

Light: Science & Applications
Computer-generated holography is a promising technique that modulates user-defined wavefronts with digital holograms. Computing appropriate holograms with faithful reconstructions is not only a problem closely related to the fundamental basis of ...
Xiaomeng Sui, Zehao He, Daping Chu, Liangcai Cao   +3 more
doaj   +1 more source

An Adaptive and Secure Holographic Image Watermarking Scheme

Entropy, 2019
A novel adaptive secure holographic image watermarking method in the sharp frequency localized contourlet transform (SFLCT) domain is presented. Based upon the sine logistic modulation map and the logistic map, we develop an encrypted binary computer ...
Chuying Yu, Xiaowei Li, Xinan Chen, Jianzhong Li   +3 more
doaj   +1 more source

Imaging properties of computer-generated holograms: the phase distribution effect in the objects’ space

St. Petersburg Polytechnical University Journal: Physics and Mathematics, 2020
In the paper, the influence of phase distribution over the objects’ space on resolution and depth of field of computer-generated holograms has been investigated.
Koreshev Sergey, Smorodinov Denis, Marina Frolova, Starovoitov Sergei   +3 more
doaj   +1 more source

Modulating Phase Encoding With Amplitude Compensation for Hologram Reconstruction

IEEE Photonics Journal
In holographic three-dimensional (3D) display, phase-only spatial light modulators (SLMs) can only accept pure phase modulation signals, often leading to amplitude distortion in the reconstructed image and inaccurate object reconstruction.
Jinbin Gui, Xiandong Ma, Junchang Li, Qinghe Song   +3 more
doaj   +1 more source

Generation of Multiple‐Depth 3D Computer‐Generated Holograms from 2D‐Image‐Datasets Trained CNN

Advanced Science
Generating computer‐generated holograms (CGHs) for 3D scenes by learning‐based methods can reconstruct arbitrary 3D scenes with higher quality and faster speed. However, the homogenization and difficulty of obtaining 3D high‐resolution datasets seriously
Xingpeng Yan, Jiaqi Li, Yanan Zhang, Hebin Chang, Hairong Hu, Tao Jing, Hanyu Li, Yang Zhang, Jinhong Xue, Xunbo Yu, Xiaoyu Jiang   +10 more
doaj   +1 more source

Real-time 4K computer-generated hologram based on encoding conventional neural network with learned layered phase. [PDF]

Sci Rep, 2023
Zhong C, Sang X, Yan B, Li H, Xie X, Qin X, Chen S.   +6 more
europepmc   +1 more source