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Kovacs P.T.,Holografika | Zilly F.,Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institut
ACM SIGGRAPH 2012 Emerging Technologies, SIGGRAPH'12 | Year: 2012

The wide variety of commercially available and emerging 3D displays - such as stereoscopic, multi-view and light-field displays - makes content creation challenging as each displays technology requires a different number of views available of the scene. As consequence, the content creation pipelines differ considerably and involve different camera setups such as beam-splitter rigs with small baselines and high quality cameras used for stereo 3D productions or camera arrays for auto-stereoscopic displays which usually use small lower quality cameras in a side-by-side arrangement. Converting content shot for a specific display technology into a different format usually impairs the image quality and is very labor-intensive. © 2012 ACM.


Adhikarla V.K.,Holografika | Adhikarla V.K.,Pazmany Peter Catholic University | Jakus G.,University of Ljubljana | Sodnik J.,University of Ljubljana
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015

The paper reports on a user study of freehand gesture interaction with a prototype of autostereoscopic 3D light field display. The interaction was based on a direct touch selection of simple objects rendered at different positions in space. The main goal of our experiment was to evaluate the overall user experience and perceived cognitive workload of such freehand interaction in 3D environment and compare it to the simplified touch-based interaction in 2D environment. The results of the experiment confirmed the hypothesis that significantly more time is required for the interaction in 3D than the interaction in 2D. Surprisingly, no significant difference was found in the results of the assessment of cognitive workload when comparing 3D and 2D. We believe the interaction scenario proposed and evaluated in this study could represent an efficient and intuitive future interaction technique for the selection and manipulation of content rendered on autostereoscopic 3D displays. © Springer International Publishing Switzerland 2015.


Kovacs P.T.,Holografika | Murray N.,Athlone Institute of Technology | Rozinaj G.,Slovak University of Technology in Bratislava | Sulema Y.,Kharkiv Polytechnic Institute | Rybarova R.,Slovak University of Technology in Bratislava
Proceedings of 2015 International Conference on Interactive Mobile Communication Technologies and Learning, IMCL 2015 | Year: 2015

Existing multimedia systems used in education mostly address only two senses by using two communication channels (visual and audio) of the five human senses (sight, hearing, taste, smell, and touch), limiting the potential efficiency of learning. This paper presents a survey on existing technical opportunities for the development of an immersive learning environment. Four components of the immersive environment - visual, audio, olfactory, and haptic are described and discussed in the paper. In particular 3D displays, head mounted devices, 3D sound systems, olfactory displays, haptic devices, and interaction devices are presented. © 2015 IEEE.


Adhikarla V.K.,Holografika | Adhikarla V.K.,Pazmany Peter Catholic University | Sodnik J.,University of Ljubljana | Szolgay P.,Pazmany Peter Catholic University | Jakus G.,University of Ljubljana
Sensors (Switzerland) | Year: 2015

This paper reports on the design and evaluation of direct 3D gesture interaction with a full horizontal parallax light field display. A light field display defines a visual scene using directional light beams emitted from multiple light sources as if they are emitted from scene points. Each scene point is rendered individually resulting in more realistic and accurate 3D visualization compared to other 3D displaying technologies. We propose an interaction setup combining the visualization of objects within the Field Of View (FOV) of a light field display and their selection through freehand gesture tracked by the Leap Motion Controller. The accuracy and usefulness of the proposed interaction setup was also evaluated in a user study with test subjects. The results of the study revealed high user preference for free hand interaction with light field display as well as relatively low cognitive demand of this technique. Further, our results also revealed some limitations and adjustments of the proposed setup to be addressed in future work. © 2015 by the authors; licensee MDPI, Basel, Switzerland.


Adhikarla V.K.,Pazmany Peter Catholic University | Marton F.,CRS4 | Balogh T.,Holografika | Gobbetti E.,CRS4
Visual Computer | Year: 2015

The discrete nature of multiprojector light field displays results in aliasing when rendering scene points at depths outside the supported depth of field causing visual discomfort. We propose an efficient on-the-fly content-aware real-time depth retargeting algorithm for live 3D light field video to increase the quality of visual perception on a cluster-driven multiprojector light field display. The proposed algorithm is embedded in an end-to-end real-time system capable of capturing and reconstructing light field from multiple calibrated cameras on a full horizontal parallax light field display. By automatically detecting salient regions of a scene, we solve an optimization to derive a non-linear operator to fit the whole scene within the comfortable viewing range of the light field display. We evaluate the effectiveness of our approach on synthetic and real world scenes. © 2015, Springer-Verlag Berlin Heidelberg.

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