scholarly journals Electronic Tabletop Holographic Display: Design, Implementation, and Evaluation

2019 ◽  
Vol 9 (4) ◽  
pp. 705 ◽  
Author(s):  
Jinwoong Kim ◽  
Yongjun Lim ◽  
Keehoon Hong ◽  
Hayan Kim ◽  
Hyun-Eui Kim ◽  
...  
Keyword(s):  
Motion Parallax ◽  
Type Systems ◽  
Performance Measure ◽  
Display System ◽  
3 Dimensional ◽  
Color Version ◽  
Holographic Display ◽  
Panel Type ◽  
High Level ◽  
Holographic Displays

Most of the previously-tried prototype systems of digital holographic display are of front viewing flat panel-type systems having narrow viewing angle, which do not meet expectations towards holographic displays having more volumetric and realistic 3-dimensional image rendering capability. We have developed a tabletop holographic display system which is capable of 360° rendering of volumetric color hologram moving image, looking much like a real object. Multiple viewers around the display can see the image and perceive very natural binocular as well as motion parallax. We have previously published implementation details of a mono color version of the system, which was the first prototype. In this work, we present requirements, design methods, and the implementation result of a full parallax color tabletop holographic display system, with some recapitulation of motivation and a high-level design concept. We also address the important issue of performance measure and evaluation of a holographic display system and image, with initial results of experiments on our system.

scholarly journals Computer-Generated Hologram Based on Reference Light Multiplexing for Holographic Display

2021 ◽  
Vol 11 (16) ◽  
pp. 7199
Author(s):  
Dapu Pi ◽  
Juan Liu
Keyword(s):  
Image Quality ◽  
Numerical Simulations ◽  
Light Wave ◽  
Information Capacity ◽  
Improve Image Quality ◽  
Multiple Images ◽  
Holographic Display ◽  
Light Waves ◽  
Computer Generated Holograms ◽  
Holographic Displays

In this article, we propose a reference light wave multiplexing scheme to increase the information capacity of computer-generated holograms. The holograms were generated by different reference light waves and superimposed together as a multiplexed hologram. A modified Gerchberg–Saxton algorithm was used to improve image quality, and different images could be reconstructed when the multiplexed hologram was illuminated by corresponding reference light waves. We performed both numerical simulations and optical experiments to demonstrate the feasibility of the proposed scheme. Numerical simulations showed that the proposed method could reconstruct multiple images successfully by a single multiplexed hologram and optical experiments are consistently good with numerical simulations. It is expected that the proposed method has great potential to be widely applied in holographic displays in the future.

scholarly journals Holographic Display System to Suppress Speckle Noise Based on Beam Shaping

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 204
Author(s):  
Di Wang ◽  
Yi-Wei Zheng ◽  
Nan-Nan Li ◽  
Qiong-Hua Wang
Keyword(s):  
Optical Element ◽  
Speckle Noise ◽  
Beam Shaping ◽  
Diffractive Optical Element ◽  
The Other ◽  
Spatial Light Modulators ◽  
Viewing Angle ◽  
Display System ◽  
Holographic Display ◽  
Light Modulators

In this paper, a holographic system to suppress the speckle noise is proposed. Two spatial light modulators (SLMs) are used in the system, one of which is used for beam shaping, and the other is used for reproducing the image. By calculating the effective viewing angle of the reconstructed image, the effective hologram and the effective region of the SLM are calculated accordingly. Then, the size of the diffractive optical element (DOE) is calculated accordingly. The dynamic DOEs and effective hologram are loaded on the effective regions of the two SLMs, respectively, while the wasted areas of the two SLMs are performed with zero-padded operations. When the laser passes through the first SLM, the light can be modulated by the effective DOEs. When the modulated beam illuminates the second SLM which is loaded with the effective hologram, the image is reconstructed with better quality and lower speckle noise. Moreover, the calculation time of the hologram is reduced. Experiments indicate the validity of the proposed system.

scholarly journals An Assessment of the Reliability of the NIGNET Data

2019 ◽  
Vol 3 (1) ◽  
pp. 18-29
Author(s):  
E. G. Ayodele ◽  
C. J. Okolie ◽  
O. A. Mayaki
Keyword(s):  
National Development ◽  
Accurate Information ◽  
Positional Accuracy ◽  
Data Archiving ◽  
Practical Applications ◽  
3 Dimensional ◽  
Gnss Network ◽  
High Level ◽  
Gnss Data ◽  
Geodetic Reference Frame

The Nigerian Geodetic Reference Frame is defined by a number of Continuously Operating Reference Stations (CORS) that constitute the Nigerian GNSS Network (NIGNET). NIGNET is essential for planning and national development with the main goal of ensuring consistency in the geodetic framework both nationally and internationally. Currently, the strength of the network in terms of data reliability has not been adequately studied due to the fact that research into CORS in Nigeria is just evolving, which constitutes a limitation in its applications. Therefore, the aim of this research is to explore the reliability of the 3-dimensional coordinates of NIGNET to inform usability and adequacy for both scientific and practical applications. In particular, this study examines if the 3-dimensional coordinates of NIGNET are equally reliable in terms of positional accuracy. Accordingly, this study utilised GNSS data collected over a period of six years (2011 – 2016) from the network to compute the daily geocentric coordinates of the stations. Exploratory and statistical data analysis techniques were used to understand the magnitude of the errors and the accuracy level in the 3-dimensional coordinates. For this purpose, accuracy metrics such as standard deviation (𝜎), standard error (𝑆𝐸) and root mean square error (RMSE) were computed. While One-way ANOVA was conducted to explore the coordinate differences. The results obtained showed that SE and RMSE ranged from 13.00 − 56.50𝑚𝑚 and 14.38 − 73.16𝑚𝑚 respectively, which signifies high accuracy. Overall, while 88% of the network showed a high level of positional accuracy, the reliability has been compromised due to excessive gaps in the data archiving. Therefore, due attention must be given to NIGNET to achieve its purpose in the provision of accurate information for various geospatial applications. Also, any efforts directed at understanding the practical implications of NIGNET must be well-embraced for the realization of its set objectives.

Holographic Display System of Digital Micro-Mirror Devices Based on LED Light Source

2016 ◽  
Vol 36 (7) ◽  
pp. 0709001
Author(s):  
马建设 Ma Jianshe ◽  
程炳超 Cheng Bingchao ◽  
曹文波 Cao Wenbo ◽  
苏萍 Su Ping ◽  
曹良才 Cao Liangcai
Keyword(s):  
Light Source ◽  
Display System ◽  
Led Light ◽  
Holographic Display

Design of Motion Parallax Stereoscopic Display System Based on Bilayer Microlens Array

2014 ◽  
Vol 43 (4) ◽  
pp. 422003
Author(s):  
苟健 GOU Jian ◽  
尹韶云 YIN Shao-yun ◽  
邓启凌 DENG Qi-ling ◽  
高洪涛 GAO Hong-tao ◽  
孙秀辉 SUN Xiu-hui ◽  
...  
Keyword(s):  
Motion Parallax ◽  
Microlens Array ◽  
Stereoscopic Display ◽  
Display System

scholarly journals Study of Non-Periodic Pinhole Array Filter for Decreasing High-Order Noise for Compact Holographic Display

2020 ◽  
Vol 10 (23) ◽  
pp. 8671
Author(s):  
Yoo Kwang Kim ◽  
Won Jong Ryu ◽  
Jin Su Lee
Keyword(s):  
Spatial Light Modulator ◽  
Optical Path Length ◽  
Wearable Devices ◽  
Optical Path ◽  
High Order ◽  
Light Modulator ◽  
Noise Sources ◽  
Holographic Display ◽  
Custom Made ◽  
Holographic Displays

The non-periodic pinhole array filtering of a spatial light modulator (SLM) is proposed for filtering the high-order noise and DC noise of a holographic display. Conventionally, DC and high-order noise sources are filtered by a 4f filtering system. Because the 4f filtering system requires a long optical path length, noise filtering is a stumbling block when attempting to realize a compact holographic display. By contrast, the proposed method simply uses a thin filter fabricated by photolithography. In order to verify this concept, we confirmed the feasibility of the filter with a numerical simulation and with a custom-made non-periodic pinhole array filter used in a practical experiment. The proposed method was shown to have the potential to be used in applications ranging from compact wearable devices to table-top holographic displays.

The effect of CyberDome, a novel 3-dimensional dome-shaped display system, on laparoscopic procedures

2009 ◽  
Vol 4 (2) ◽  
pp. 125-132 ◽  
Author(s):  
Kenoki Ohuchida ◽  
Hajime Kenmotsu ◽  
Atsuyuki Yamamoto ◽  
Kazuya Sawada ◽  
Takehito Hayami ◽  
...  
Keyword(s):  
Display System ◽  
3 Dimensional ◽  
Laparoscopic Procedures

Motion Parallax in the Visual Cliff Situation

1971 ◽  
Vol 32 (1) ◽  
pp. 43-53 ◽  
Author(s):  
John W. Somervill
Keyword(s):  
Motion Parallax ◽  
Visual Cliff ◽  
Direct Manipulation ◽  
Significant Preference ◽  
3 Dimensional ◽  
Depth Discrimination ◽  
Shallow Side

Walk's (1965) assumption that motion parallax is “the critical cue” for depth discrimination by newly hatched chicks was assessed by the use of 3-dimensional striped patterns on each side of the centerboard. The 3-dimensional patterns served two purposes: (1) to test an hypothesis that chicks would show no significant preference for the “shallow” side if motion parallax cues were presented independent of the solid appearance furnished by 2-dimensional surfaces and (2) to permit direct manipulation of the stimulus basis for motion parallax. Ss were 250 chicks, 6 to 24 hr. old. Results provide evidence that stimuli for motion parallax, devoid of the solid appearance of 2-dimensional surfaces, are sufficient cues for depth discrimination by chicks.

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