1 首尔国立大学 电子与计算机工程系, 韩国 首尔 08826
2 南京理工大学 光谱成像与智能感知江苏省重点实验室, 江苏 南京 210094
由于三维(3D)成像技术有着广泛的应用, 尤其是在信息和生命科学领域的应用, 因此越来越受到人们的关注。这些技术大致可分为两类: 基于光线的三维成像技术和基于波前的三维成像技术。传统成像技术存在系统装置复杂和成像质量不尽人意等问题, 极大限制了其在相关领域的应用, 因此基于深度测量的三维成像技术越来越受到重视。文中概述了基于深度测量的三维成像技术, 分别详细描述了基于深度测量三维成像的光线场和光波场的相关技术, 给出了光线场和光波场成像技术之间的联系, 基于这些描述和分析, 给出了基于深度测量三维成像研究领域的研究方向。
光场 相位恢复 三维成像 light field phase retrieval three-dimensional imaging 红外与激光工程
2019, 48(6): 0603013
Author Affiliations
Abstract
1 School of Electrical and Computer Engineering and Inter-University Semiconductor Research Center, Seoul National University, Gwanak-Gu Gwanakro 1, Seoul 08826, South Korea
2 School of Electronics Engineering, Kyungpook National University, Daegu 41566, South Korea
We propose the active metasurface using phase-change material Ge2Sb2Te5 (GST), which has two distinct phases so called amorphous and crystalline phases, for an ultrathin light path switching device. By arranging multiple anisotropic GST nanorods, the gradient metasurface, which has opposite directions of phase gradients at the two distinct phases of GST, is demonstrated theoretically and numerically. As a result, in the case of normal incidence of circularly polarized light at the wavelength of 1650 nm, the cross-polarized light deflects to 55.6° at the amorphous phase and +55.6° at the crystalline phase with the signal-to-noise ratio above 10 dB.
160.3918 Metamaterials 220.1080 Active or adoptive optics Chinese Optics Letters
2018, 16(5): 050009
Author Affiliations
Abstract
Editorial for Focus Issue on Optical 3D Display and ImagingWith the impressive progress of flat panel display technologies, the three-dimensional (3D) display and imaging technologies have attracted much attention in recent years as they can provide ultimate realistic views to us. Hence we designed a focus issue intended to introduce recent optical researches in this field, especially the works by some distinguished research groups.This focus issue includes twenty-two invited papers, review papers, and contributed papers from China, South Korea, Japan, USA, UK, Israel, and Russian. We have classified the papers into four topics: 3D Holographic Display, Auto-stereography and Virtual Reality, Digital Holography, and Computer-generated Holography. It is hoped that this issue will bring the research community's attention to some of the latest development in the area.We want to thank the Executive Editor-in-Chief, Prof. Changhe Zhou, for inviting us to serve as this focus issue editors and Ms. Yanfang Hu for her valuable help in ensuring the timely production of this focus issue.
000.0000 General Chinese Optics Letters
2014, 12(6): 060001
Author Affiliations
Abstract
Graphics processing unit (GPU) based fast calculation method for computer generated spherical hologram (CGSH) of a real-existing object is proposed. Three-dimensional (3D) point cloud is constructed by capturing a real-existing object from multiple directions using a depth camera. The GPU based calculation is used in both hologram generation part and numerical reconstruction part of the CGSH. The improved calculation efficiency is verified by comparing the computation speed between central processing unit (CPU) based and GPU based implementation.
090.0090 Holography 090.1760 Computer holography Chinese Optics Letters
2014, 12(6): 060016
Author Affiliations
Abstract
We introduce a phase-only hologram generation method based on an integral imaging, and propose an enhancement method in representable depth interval. The computational integral imaging reconstruction method is modified based on optical °ow to obtain depth-slice images for the focused objects only. A phase-only hologram for multiple plane images is generated using the iterative Fresnel transform algorithm. In addition, a division method in hologram plane is proposed for enhancement in the representable minimum depth interval.
090.0090 Holography 100.0100 Image processing Chinese Optics Letters
2011, 9(12): 120009
