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Symmetry
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Advances in 3D Imaging, Display and Security with Symmetry/Asymmetry
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Advances in 3D Imaging, Display and Security with Symmetry/Asymmetry

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Computer".

Deadline for manuscript submissions: closed (30 June 2022) | Viewed by 4191

Special Issue Editors

Prof. Dr. Xiaowei Li

E-Mail Website
Guest Editor
School of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China
Interests: 3D display; 3D data security; imaging processing; multimedia security; computational imaging
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Shu-Feng Lin

E-Mail Website
Guest Editor
College of Physics and Optoelectronics, Beijing University Of Technology, Beijing 100124, China
Interests: holography
Dr. Yan Xing

E-Mail Website
Guest Editor
School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China
Interests: 3D display; 3D data security
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear colleagues,

New technologies for three-dimensional (3D) visualization of real-world objects have been pursued by scientists and engineers for many decades. Three-dimensional imaging is very broad and its application areas include commercial electronics, entertainment, manufacturing, augmented reality, security, defense, etc. This Special Issue mainly looks at integral imaging, holographic displays, and 3D data security with symmetric and asymmetric encryption.

Integral imaging can produce true 3D color images with full parallax by incoherent light, and it has been revived over the past decade or so as a promising approach for massive 3D commercialization. Holography is a lensless photographic technique that can produce 3D images based on interference and diffraction optics. It has been widely studied in many research fields, such as microscopy, interferometry, 3D display, etc. Three-dimensional data security is the process of protecting private data and preventing data loss through unauthorized access. Asymmetric cryptography, which can also be called public-key cryptography, uses private and public keys to encrypt and decrypt data. Therefore, this Special Issue aims to promote the development of 3D technologies and security and encourage our colleagues to share and publish their research by submitting an academic paper.

Prof. Dr. Xiao-Wei Li
Prof. Dr. Shu-Feng Lin
Dr. Yan Xing
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • integral imaging
  • 3D security
  • symmetric and asymmetry encryption
  • image processing for 3D acquisition or display applications
  • 3D imaging and display systems
  • holographic 3D display
  • holographic microscopy
  • holographic interferometry
  • data storage

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Published Papers (2 papers)

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11 pages, 68430 KiB  
Article
Distortion-Corrected Integral Imaging 3D Display System Based on Lens Array Holographic Optical Element
by Jun-Hua Li, Han-Le Zhang, Qing-Lin Ji and Wu-Xiang Zhao
Symmetry 2022, 14(7), 1481; https://doi.org/10.3390/sym14071481 - 20 Jul 2022
Viewed by 1805
Abstract
We propose a distortion-corrected integral imaging (II) 3D display system based on lens array holographic optical element (LAHOE). The LAHOE is used as a projection screen. The projection beam of the LAHOE is parallel light. Hence, the projection system consists of a spatial [...] Read more.
We propose a distortion-corrected integral imaging (II) 3D display system based on lens array holographic optical element (LAHOE). The LAHOE is used as a projection screen. The projection beam of the LAHOE is parallel light. Hence, the projection system consists of a spatial light modulator, a reverse projection lens, a relay optical element, and a telecentric lens. The acquired 3D data and the reconstructed 3D image of II are symmetrically related to each other. Therefore, there is lens distortion in the projection system. To avoid affecting the viewing experience of the viewers, the elemental image array (EIA) is projected obliquely on the LAHOE, causing the lateral distortion of the EIA. There is a position deviation in the projection system, so the projected EIA has geometric deformation. Due to the distortion of the EIA, it is difficult to precisely align the projected EIA and LAHOE, which results in serious flip of the reconstructed 3D images. The distortion of the EIA affects the asymmetry of the 3D image reconstruction. Lens distortion can be solved by the distortion compensation method. Lateral and the geometric deformation can be solved by the perspective transformations in computer graphics. After correction, the undistorted EIA is projected, and the projected EIA on the LAHOE has little distortion. In the process of 3D image reconstruction, the causes of asymmetry affecting 3D image reconstruction are analyzed, and the issues that generate these asymmetric factors are addressed. Experimental results indicate that a better 3D display effect is achieved. Full article
(This article belongs to the Special Issue Advances in 3D Imaging, Display and Security with Symmetry/Asymmetry)
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15 pages, 25185 KiB  
Article
3D Copyright Protection Based on Binarized Computational Ghost Imaging Encryption and Cellular Automata Transform
by Meng Wang, Mengli Chen, Jianzhong Li and Chuying Yu
Symmetry 2022, 14(3), 595; https://doi.org/10.3390/sym14030595 - 17 Mar 2022
Cited by 3 | Viewed by 1593
Abstract
In this paper, a watermark embedding scheme based on ghost image encryption and cellular automata transformation is proposed. In this scheme, the watermark forms speckle through different light intensities into a key, and the cellular automata transformation algorithm is embedded into the 3D [...] Read more.
In this paper, a watermark embedding scheme based on ghost image encryption and cellular automata transformation is proposed. In this scheme, the watermark forms speckle through different light intensities into a key, and the cellular automata transformation algorithm is embedded into the 3D image. Compared with the traditional watermarking encryption method, this scheme combines ghost imaging and the cellular automata transformation algorithm, which double guarantees and increases the confidentiality of the watermark. The binary computing ghost imaging discussed in this paper saves the storage space of password text and makes the transmission of password text more convenient and faster. Experiments on this method also verify that the watermark-embedded image has higher imperceptibility and higher robustness against attacks, and that the extracted watermark has good integrity. Full article
(This article belongs to the Special Issue Advances in 3D Imaging, Display and Security with Symmetry/Asymmetry)
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