Athanasia Symeonidou

Athanasia Symeonidou
Hogeschool West-Vlaanderen | HOWEST · HITlab

Doctor of Engineering
XR Technical Specialist | Research scientist | Immersive 3D visualizations

About

22
Publications
6,834
Reads
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312
Citations
Introduction
I am an XR Technical Specialist with a PhD in holography and 3D displays. I work on the full pipeline from ideation and design, to development and final polishing. As a research scientist I like to investigate how immersive technologies can add value to daily activities and explore the effects of XR apps, for example in training, by measuring physiological data (eye-tracking, EEG etc). #VR #AR #XR #holography #CGH #3D #3Ddisplay #immersivetechnologies
Additional affiliations
June 2014 - December 2019
Vrije Universiteit Brussel
Position
  • PhD Student
Description
  • - Project ERC INTERFERE: Research on computer-generated holography - Teaching Assistant for the Master's course "Image Processing"
Education
June 2014 - November 2019
Vrije Universiteit Brussel
Field of study
  • Engineering Science
October 2009 - October 2012
Aristotle University of Thessaloniki
Field of study
  • Electronic Technology of Telecommunications
September 2003 - July 2009
Aristotle University of Thessaloniki
Field of study
  • Physics, specialty in Electronics and telecommunications

Publications

Publications (22)
Article
Full-text available
We propose a novel fast method for full parallax computer-generated holograms with occlusion processing, suitable for volumetric data such as point clouds. A novel light wave propagation strategy relying on the sequential use of the wavefront recording plane method is proposed, which employs look-up tables in order to reduce the computational compl...
Article
Full-text available
A technique integrating the bidirectional reflectance distribution function (BRDF) is proposed to generate realistic high-quality colour computer-generated holograms (CGHs). We build on prior work, namely a fast computer-generated holography method for point clouds that handles occlusions. We extend the method by integrating the Phong illumination...
Article
Full-text available
Holography is considered to be the ultimate display technology since it can account for all human visual cues such as stereopsis and eye focusing. Aside from hardware constraints for building holographic displays, there are still many research challenges regarding holographic signal processing that need to be tackled. In this overview, we delineate...
Article
High-quality holographic video generation requires both high computational resources and time; therefore, algorithms that can generate holographic videos efficiently will be soon in demand for dynamic holographic 3D displays. In this work, we present two algorithms that use a motion compensation scheme – based on the rotational transformation of wa...
Conference Paper
Firefighters must be trained to deal with stress during firefighting and applying procedures. Aiming to alleviate the limitations in practice opportunities, a virtual reality (VR) application for training on fire extinguishing was developed, allowing for practice in a safe learning environment, while remaining aligned with the real-life training an...
Conference Paper
Several assessment tools are used in occupational therapy; however, it is not always straightforward to have objective evaluation metrics between different occupational therapists and testing setups, which complicates the comparison of the patient’s performance before and after treatment, and also the comparison of the performances of the patients....
Article
Full-text available
Digital video holography faces two main problems: 1) computer-generation of holograms is computationally very costly, even more when dynamic content is considered; 2) the transmission of many high-resolution holograms requires large bandwidths. Motion compensation algorithms leverage temporal redundancies and can be used to address both issues by p...
Thesis
In recent years, three-dimensional display technology has seen huge advancements, targeting a more immersive 3D experience for a plethora of applications such as medical imaging, education, CAD, entertainment and more. However, the holy grail of three-dimensional imaging remains holography, since it is the most complete representation of a 3D scene...
Article
Full-text available
Holographic video requires impractical bitrates for storage and transmission without data compression. We introduce an end-to-end compression pipeline for compressing holographic sequences with known ground truth motion. The compression strategy employs a motion compensation algorithm based on the rotational transformation of an angular spectrum. R...
Preprint
Full-text available
Visual quality assessment of digital holograms is facing many challenges. Main difficulties are related to the limited spatial resolution and angular field of view of holographic displays in combination with the complexity of steering and operating them for such tasks. Alternatively, non-holographic displays - and in particular light-field displays...
Conference Paper
Holographic video imposes impractical bitrates for storage and communication without compression. We introduce exact motion compensation in a codec using rotational transformation of angular spectrum and obtain SNR improvements of 20 dB over HEVC.
Conference Paper
Recently a new perceptual quality predictor called Sparseness Significance Ranking Measure(SSRM) was proposed in the domain of the regular imaging where it proved to be highly compatible with the acquired perceptual quality scores from human subjects. Thanks to its unique design, one can utilize this method for both real and complex valued data wit...
Conference Paper
Three occlusion processing techniques for computer-generated holography are proposed to support layer-based methods of acquiring holograms from point clouds. The techniques use Gaussian masks and masks generated by dilation per point or per layer.
Conference Paper
The Sparseness Significance Ranking Measure (SSRM) was recently proposed as full reference quality measure for regular images. In this paper, we evaluate its performance on holographic content in comparison to MSE, PSNR and the Versatile Similarity Measure (VSM). The experimental results based on subjective quality assessment show a significant gai...
Conference Paper
In recent years, the domain of plenoptic imaging has seen significant scientific and industrial evolutions. We present novel signal processing technologies addressing holographic imaging, ranging from capture to rendering of complex amplitude digital holograms.
Conference Paper
Full-text available
Holograms, either optically acquired or simulated numerically from 3D datasets, such as point clouds, have special rendering requirements for display. Evaluating the quality of hologram generation techniques is not straightforward, since high-quality holographic display technologies are still immature, In this paper we present a framework for three...
Conference Paper
Digital holography is mainly used today for metrology and microscopic imaging and is emerging as an important potential technology for future holographic television. To generate the holographic content, computer-generated holography (CGH) techniques convert geometric descriptions of a 3D scene content. To model different surface types, an accurate...
Conference Paper
Full-text available
Holography allows for both the recording and reproduction of wavefields of light, and is thereby able to fully capture the three-dimensional structure of objects. The appearance of the object will change according to the position and orientation of the viewer, providing an immersive experience as if objects are actually present. Moreover, holograms...
Article
Full-text available
A metamaterial based electronically controlled microstrip structure, performing as leaky wave (LW) antenna with beam steering capability was synthesized. The structure has the configuration of metamaterial transmission line(TL) composed of cascade composite right- /left-handed(CRLH) unit cells. The direction of maximum radiation is tuned via the va...
Thesis
The aim of this thesis is to design microstrip antenna for mobile communication devices in the 2.4 GHz band with the ability to control the direction of the maximum emission of the antenna operationally and in real time. The antenna consists of a repetitive periodic structure synthesized via the approach of artificial metamaterials to the theory of...

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Projects

Project (1)