scholarly journals Studying the Recent Improvements in Holograms for Three-Dimensional Display

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Hamed Abbasi ◽  
Talie Zarei ◽  
Neda Jalali Farahani ◽  
Adeleh Granmayeh Rad
Keyword(s):  
Three Dimensional ◽  
3D Images ◽  
3D Displays ◽  
Three Dimensional Display ◽  
Three Dimensional Images

Displayers tend to become three-dimensional. The most advantage of holographic 3D displays is the possibility to observe 3D images without using glasses. The quality of created images by this method has surprised everyone. In this paper, the experimental steps of making a transmission hologram have been mentioned. In what follows, current advances of this science-art will be discussed. The aim of this paper is to study the recent improvements in creating three-dimensional images and videos by means of holographic techniques. In the last section we discuss the potentials of holography to be applied in future.

Filtering Algorithms for 3D Range Image Analysis

2013 ◽  
Vol 199 ◽  
pp. 235-240 ◽  
Author(s):  
Andrzej Sioma
Keyword(s):  
Image Analysis ◽  
Vision System ◽  
Three Dimensional ◽  
Range Image ◽  
Construction Technique ◽  
3D Images ◽  
Image Construction ◽  
Dimensional Image ◽  
Three Dimensional Vision

This article is devoted to the methods of image analysis used in three-dimensional vision systems. Based on a sample set of 3D images, their defects resulting from the adopted three-dimensional image construction technique are discussed. Those defects are discussed in relation to the following parameters: speed of the vision system, power of the laser, laser mode, laser arrangement relative to the vision system sensor and relative to the tested surface. To illustrate the cases discussed, images showing the effects of selected parameters on the quality of mapping of the tested object onto a three-dimensional image were presented. The next part of the article discusses methods of range image filtering that removes or reduces the importance of defects of the adopted method in any control and measuring tasks. Particular attention is given to methods of removing data described as missing data.

scholarly journals Wavelength-Selective Phase-Shifting Digital Holography: Color Three-Dimensional Imaging Ability in Relation to Bit Depth of Wavelength-Multiplexed Holograms

2018 ◽  
Vol 8 (12) ◽  
pp. 2410 ◽  
Author(s):  
Tatsuki Tahara ◽  
Reo Otani ◽  
Yasuhiro Takaki
Keyword(s):  
Digital Holography ◽  
3D Imaging ◽  
Dynamic Range ◽  
Three Dimensional ◽  
Image Sensor ◽  
Phase Shifting ◽  
3D Images ◽  
Wavelength Resolution ◽  
The Relationship

The quality of reconstructed images in relation to the bit depth of holograms formed by wavelength-selective phase-shifting digital holography was investigated. Wavelength-selective phase-shifting digital holography is a technique to obtain multiwavelength three-dimensional (3D) images with a full space-bandwidth product of an image sensor from wavelength-multiplexed phase-shifted holograms and has been proposed since 2013. The bit resolution required to obtain a multiwavelength holographic image was quantitatively and experimentally evaluated, and the relationship between wavelength resolution and dynamic range of an image sensor was numerically simulated. The results indicate that two-bit resolution per wavelength is required to conduct color 3D imaging.

scholarly journals To choose the use of 2d or 3d images in rehabilitation: review

2020 ◽  
Vol 17 (3) ◽  
pp. 116-119
Author(s):  
O. V. Kubryak ◽  
Elena Aleksandrovna Kriklenko
Keyword(s):  
Virtual Reality ◽  
Visual Perception ◽  
Visual Feedback ◽  
Three Dimensional ◽  
Motor Rehabilitation ◽  
Feedback Channel ◽  
Virtual Reality Technology ◽  
3D Images ◽  
3D Displays ◽  
Selection For

Different properties of displays, features of visual perception of three-dimensional images and other conditions, probably affect the effectiveness of motor rehabilitation when using a visual feedback channel and virtual reality technology. A brief review presents the latest publications on a choice of 2D or 3D displays. It is concluded that the presence of many features not only creates difficulties in comparing the effects of using various equipment, but also provides the potential for targeted display selection for a particular rehabilitation task.

Natural three-dimensional display with high quality of reconstructed images based on dense sampling

Optik ◽  
2015 ◽  
Vol 126 (23) ◽  
pp. 4605-4607 ◽  
Author(s):  
Xunbo Yu ◽  
Xinzhu Sang ◽  
Duo Chen ◽  
Peng Wang ◽  
Xin Gao ◽  
...  
Keyword(s):  
Three Dimensional ◽  
High Quality ◽  
Three Dimensional Display ◽  
Dense Sampling

scholarly journals Analysis of the Motion Picture Quality of Stereoscopic Three-dimensional Images

2010 ◽  
Vol 14 (4) ◽  
pp. 383-387 ◽  
Author(s):  
Hee-Jin Choi ◽  
Jae-Hyun Jung ◽  
Hwi Kim ◽  
Byoung-Ho Lee
Keyword(s):  
Motion Picture ◽  
Three Dimensional ◽  
Picture Quality ◽  
Three Dimensional Images

scholarly journals Aktina Vision: Full-parallax three-dimensional display with 100 million light rays

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Hayato Watanabe ◽  
Naoto Okaichi ◽  
Takuya Omura ◽  
Masanori Kano ◽  
Hisayuki Sasaki ◽  
...  
Keyword(s):  
Light Field ◽  
Three Dimensional ◽  
Prototype System ◽  
3D Display ◽  
3D Images ◽  
Image Reproduction ◽  
Light Rays ◽  
Real Objects ◽  
Three Dimensional Display ◽  
First Time

AbstractNatural three-dimensional (3D) images, perceived as real objects in front of the viewer, can be displayed by faithfully reproducing light ray information. However, 3D images with sufficient characteristics for practical use cannot be displayed using conventional technologies because highly accurate reproduction of numerous light rays is required. We propose a novel full-parallax light field 3D display method named ‘Aktina Vision’, which includes a special top-hat diffusing screen with a narrow diffusion angle and an optical system for reproducing high-density light rays. Our prototype system reproduces over 100,000,000 light rays at angle intervals of less than 1° and optimally diffuses light rays with the top-hat diffusing screen. Thus, for the first time, light field 3D image reproduction with a maximum spatial resolution of approximately 330,000 pixels, which is near standard-definition television resolution and three times that of conventional light field display using a lens array, is achieved.

scholarly journals Assessment of Tooth Preparations Submitted to Dental Laboratories for Fabrication of Monolithic Zirconia Crowns

2021 ◽  
Vol 9 (10) ◽  
pp. 112
Author(s):  
Ramtin Sadid-Zadeh ◽  
Hadjer Sahraoui ◽  
Brian Lawson ◽  
Robert Cox
Keyword(s):  
Three Dimensional ◽  
Finish Line ◽  
Posterior Teeth ◽  
3D Images ◽  
Line Angle ◽  
Zirconia Crowns ◽  
Monolithic Zirconia ◽  
Tooth Preparation ◽  
Line Design

Purpose: The objective of this study was to assess the quality of posterior teeth prepared for monolithic zirconia crowns. Materials and Methods: A total of 392 STL-files of posterior preparations for monolithic zirconia crowns were evaluated in this study. Three-dimensional (3D) images were evaluated using a software (3D Viewer; 3Shape A/S, Copenhagen, Denmark) for finish line design, finish line width, occluso-cervical dimension, total occlusal convergence (TOC), intercuspal angulation, finish line quality, line angle form, and presence or absence of undercut at the axial wall and unsupported lip of enamel. The assessment was performed by two calibrated evaluators. Then, data were descriptively analyzed. Data for occluso-cervical dimension and TOC were descriptively analyzed according to their location. Results: Thirty-nine percent of premolars, 77% of first molars, and 91% of second molars had an average occluso-cervical dimension of less than 3 mm (premolars) and 4 mm (molars), with most of the preparations having a TOC of more than 20 degrees. More than 50% of preparations had undercut, unsupported enamel and/or unacceptable finish line quality. Conclusions: The quality of tooth preparation including finish line quality, absence of unsupported enamel and undercut at the axial wall should be evaluated when preparing monolithic zirconia crowns.

scholarly journals Multi-View 3D Integral Imaging Systems Using Projectors and Mobile Devices

Photonics ◽  
2021 ◽  
Vol 8 (8) ◽  
pp. 331
Author(s):  
Nikolai Petrov ◽  
Maksim Khromov ◽  
Yuri Sokolov
Keyword(s):  
Mobile Devices ◽  
Mobile Phones ◽  
Three Dimensional ◽  
Imaging Systems ◽  
Viewing Angle ◽  
3D Images ◽  
Integral Imaging ◽  
Large Size ◽  
3D Displays ◽  
2D Images

Glassless 3D displays using projectors and mobile phones based on integral imaging technology have been developed. Three-dimensional image files are created from the 2D images captured by a conventional camera. Large size 3D images using four HD and Ultra HD 4K projectors are created with a viewing angle of 35 degrees and a large depth. Three-dimensional images are demonstrated using optimized lenticular lenses and mobile smartphones, such as LG and Samsung with resolution 2560 × 1440, and 4K Sony with resolution 3840 × 2160.

scholarly journals A JOINT CALIBRATION METHOD OF 3D IMAGES ACQUIRED BY COMMON OPTICAL PATH PAYLOAD

2019 ◽  
Vol XLII-2/W16 ◽  
pp. 221-226
Author(s):  
G. E. Teng ◽  
M. Zhou ◽  
J. Hu ◽  
H. H. Wu ◽  
W. Li ◽  
...  
Keyword(s):  
Time Synchronization ◽  
Three Dimensional ◽  
Calibration Method ◽  
Optical Path ◽  
3D Images ◽  
Linear Ccd ◽  
New Type ◽  
The Common ◽  
Misalignment Error

<p><strong>Abstract.</strong> The common optical path payload is a new type of imaging payload that can acquire LiDAR data and CCD images simultaneously. This new payload integrates the linear LiDAR and linear CCD images according to the common optical system, and achieves the registration of LiDAR point cloud and CCD images by the alignment of common aperture optical axis and time synchronization control in the front of hardware. Based on the fixed matching relationship between CCD probes and LiDAR probes offered by optical path of common, this paper proposes a joint calibration method, which reduces the ranging error and misalignment error. And the results verify that this method can effectively improve the quality of the three-dimensional images. The standard deviations of validation area and roof are improved from 0.54&amp;thinsp;m to 0.14&amp;thinsp;m and 1.83&amp;thinsp;m to 0.26&amp;thinsp;m respectively.</p>

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