Results 41 to 50 of about 50,688 (337)

A digital hologram-based encryption and compression method for 3D models

Frontiers in Physics, 2022
This study proposes a novel method to compress and decompress the 3D models for safe transmission and storage. The 3D models are first extracted to become 3D point clouds, which would be classified by the K-means algorithm.
Yukai Sun, Meirong Zhao, Pingjuan Niu, Yelong Zheng, Chuntian Liu, Shiyu Zhang, Songqi Bai, Jinwei Guo   +7 more
doaj   +1 more source

Fast Extended Depth-of-Field Reconstruction for Complex Holograms Using Block Partitioned Entropy Minimization

Applied Sciences, 2018
Optical scanning holography (OSH) is a powerful and effective method for capturing the complex hologram of a three-dimensional (3-D) scene. Such captured complex hologram is called optical scanned hologram. However, reconstructing a focused image from an
Peter Wai Ming Tsang, Ting-Chung Poon, Jung-Ping Liu   +2 more
doaj   +1 more source

Experimental study on Fe: LiNbO₃ crystal angular multiplexing holography

上海师范大学学报. 自然科学版, 2019
In this paper,the recording and readout characteristics of photorefractive volume hologram were studied by using Fe:LiNbO3 crystal as the recording medium.The optical experimental setup for angular multiplexing photorefractive volume holographic was ...
TANG Ming, YU Jiawen, LU Chenxu, HU Zhijuan, YAN Aimin   +4 more
doaj   +1 more source

Real-time holographic camera for obtaining real 3D scene hologram

Light: Science & Applications
As a frontier technology, holography has important research values in fields such as bio-micrographic imaging, light field modulation and data storage.
Zhao-Song Li, Chao Liu, Xiao-Wei Li, Yi Zheng, Qian Huang, Yi Zheng, Ye-Hao Hou, Chen-Liang Chang, Dawei Zhang, S. Zhuang, Di Wang, Qiong-Hua Wang   +11 more
semanticscholar   +1 more source

Full-colour nanoprint-hologram synchronous metasurface with arbitrary hue-saturation-brightness control

Light: Science & Applications, 2019
The colour gamut, a two-dimensional (2D) colour space primarily comprising hue and saturation (HS), lays the most important foundation for the colour display and printing industries.
Yanjun Bao, Ying Yu, Haofei Xu, Chao Guo, Juntao Li, Shang Sun, Zhangkai Zhou, C. Qiu, Xuehua Wang   +8 more
semanticscholar   +1 more source

Waveguide holograms: A new approach to hologram integration

Optics Communications, 1976
Abstract A new class of holography is proposed, in which (1) the evanescent part of a guided wave, or (2) the guided wave in a thin-film hologram is utilized as the reference wave and/or the illuminating one. The hologram was designated as “wave-guide hologram” and has advantages in the possibility of integration, wide field of view, and compactness ...
SUHARA, Toshiaki, NISHIHARA, Hiroshi, KOYAMA, Jiro   +2 more
openaire   +2 more sources

Lossless Compression Using the Ramanujan Sums: Application to Hologram Compression

IEEE Access, 2020
The Ramanujan sum, introduced by S. Ramanujan, has been utilized-among other applications-for signal processing. It has recently been suggested that transforms using the Ramanujan sums may also provide the benefit of data compression. This study presents
Harutaka Shiomi, Tomoyoshi Shimobaba, Takashi Kakue, Tomoyoshi Ito   +3 more
doaj   +1 more source

Liquid lens based holographic camera for real 3D scene hologram acquisition using end-to-end physical model-driven network

Light: Science & Applications
With the development of artificial intelligence, neural network provides unique opportunities for holography, such as high fidelity and dynamic calculation. How to obtain real 3D scene and generate high fidelity hologram in real time is an urgent problem.
Di Wang, Zhao-Song Li, Yi Zheng, Youngjun Zhao, Chao Liu, Jinbo Xu, Yi Zheng, Qian Huang, Chen-Liang Chang, Dawei Zhang, S. Zhuang, Qiong-hua Wang   +11 more
semanticscholar   +1 more source

Hologram conversion for speckle free reconstruction using light field extraction and deep learning.

Optics Express, 2020
A novel hologram conversion technique for speckle-less reconstruction is proposed. Many speckle-less reconstruction methods require holograms specially created for those techniques, limiting their applications to general pre-existing holograms.
Dae‐youl Park, Jae-Hyeung Park
semanticscholar   +1 more source

Spatiotemporal hologram

Nature Communications
Spatiotemporal structured light has opened up new avenues for optics and photonics. Current spatiotemporal manipulation of light mostly relies on phase-only devices such as liquid crystal spatial light modulator to generate spatiotemporal optical fields with unique photonic properties.
Qian Cao, Nianjia Zhang, Andy Chong, Qiwen Zhan   +3 more
openaire   +4 more sources