Virtual Reality Head-Mounted Display with Large Field of View Based on Stitching

2019 ◽  
Vol 39 (6) ◽  
pp. 0612002 ◽  
Author(s):  
陆驰豪 Chihao Lu ◽  
李海峰 Haifeng Li ◽  
高涛 Tao Gao ◽  
徐良 Liang Xu ◽  
李海丽 Haili Li
Keyword(s):  
Virtual Reality ◽  
Field Of View ◽  
Large Field ◽  
Head Mounted Display

scholarly journals Colour Calibration of a Head Mounted Display for Colour Vision Research Using Virtual Reality

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Raquel Gil Rodríguez ◽  
Florian Bayer ◽  
Matteo Toscani ◽  
Dar’ya Guarnera ◽  
Giuseppe Claudio Guarnera ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Real World ◽  
Vision Research ◽  
Colour Vision ◽  
Software Implementation ◽  
Field Of View ◽  
Large Field ◽  
Colour Constancy ◽  
Head Mounted Display ◽  
Colour Appearance

AbstractVirtual reality (VR) technology offers vision researchers the opportunity to conduct immersive studies in simulated real-world scenes. However, an accurate colour calibration of the VR head mounted display (HMD), both in terms of luminance and chromaticity, is required to precisely control the presented stimuli. Such a calibration presents significant new challenges, for example, due to the large field of view of the HMD, or the software implementation used for scene rendering, which might alter the colour appearance of objects. Here, we propose a framework for calibrating an HMD using an imaging colorimeter, the I29 (Radiant Vision Systems, Redmond, WA, USA). We examine two scenarios, both with and without using a rendering software for visualisation. In addition, we present a colour constancy experiment design for VR through a gaming engine software, Unreal Engine 4. The colours of the objects of study are chosen according to the previously defined calibration. Results show a high-colour constancy performance among participants, in agreement with recent studies performed on real-world scenarios. Our studies show that our methodology allows us to control and measure the colours presented in the HMD, effectively enabling the use of VR technology for colour vision research.

Design of an optical see-through head-mounted display with a low f-number and large field of view using a freeform prism

2009 ◽  
Vol 48 (14) ◽  
pp. 2655 ◽  
Author(s):  
Dewen Cheng ◽  
Yongtian Wang ◽  
Hong Hua ◽  
M. M. Talha
Keyword(s):  
Field Of View ◽  
Large Field ◽  
Head Mounted Display

scholarly journals The Accuracy and Precision of Position and Orientation Tracking in the HTC Vive Virtual Reality System for Scientific Research

i-Perception ◽  
2017 ◽  
Vol 8 (3) ◽  
pp. 204166951770820 ◽  
Author(s):  
Diederick C. Niehorster ◽  
Li Li ◽  
Markus Lappe
Keyword(s):  
Virtual Reality ◽  
Visual Stimulation ◽  
Tracking System ◽  
Ground Plane ◽  
Calibration Procedure ◽  
Large Field ◽  
Head Mounted Display ◽  
Accuracy And Precision ◽  
Time Calibration ◽  
Position And Orientation

The advent of inexpensive consumer virtual reality equipment enables many more researchers to study perception with naturally moving observers. One such system, the HTC Vive, offers a large field-of-view, high-resolution head mounted display together with a room-scale tracking system for less than a thousand U.S. dollars. If the position and orientation tracking of this system is of sufficient accuracy and precision, it could be suitable for much research that is currently done with far more expensive systems. Here we present a quantitative test of the HTC Vive’s position and orientation tracking as well as its end-to-end system latency. We report that while the precision of the Vive’s tracking measurements is high and its system latency (22 ms) is low, its position and orientation measurements are provided in a coordinate system that is tilted with respect to the physical ground plane. Because large changes in offset were found whenever tracking was briefly lost, it cannot be corrected for with a one-time calibration procedure. We conclude that the varying offset between the virtual and the physical tracking space makes the HTC Vive at present unsuitable for scientific experiments that require accurate visual stimulation of self-motion through a virtual world. It may however be suited for other experiments that do not have this requirement.

The Shared View Paradigm in Asymmetric Virtual Reality Setups

i-com ◽  
2020 ◽  
Vol 19 (2) ◽  
pp. 87-101
Author(s):  
Robin Horst ◽  
Fabio Klonowski ◽  
Linda Rau ◽  
Ralf Dörner
Keyword(s):  
Virtual Reality ◽  
Virtual Environments ◽  
Real World ◽  
User Study ◽  
Field Of View ◽  
Virtual Scene ◽  
Head Mounted Display ◽  
Safety Aspects ◽  
Common Technique ◽  
Visualization Techniques

AbstractAsymmetric Virtual Reality (VR) applications are a substantial subclass of multi-user VR that offers not all participants the same interaction possibilities with the virtual scene. While one user might be immersed using a VR head-mounted display (HMD), another user might experience the VR through a common desktop PC. In an educational scenario, for example, learners can use immersive VR technology to inform themselves at different exhibits within a virtual scene. Educators can use a desktop PC setup for following and guiding learners through virtual exhibits and still being able to pay attention to safety aspects in the real world (e. g., avoid learners bumping against a wall). In such scenarios, educators must ensure that learners have explored the entire scene and have been informed about all virtual exhibits in it. According visualization techniques can support educators and facilitate conducting such VR-enhanced lessons. One common technique is to render the view of the learners on the 2D screen available to the educators. We refer to this solution as the shared view paradigm. However, this straightforward visualization involves challenges. For example, educators have no control over the scene and the collaboration of the learning scenario can be tedious. In this paper, we differentiate between two classes of visualizations that can help educators in asymmetric VR setups. First, we investigate five techniques that visualize the view direction or field of view of users (view visualizations) within virtual environments. Second, we propose three techniques that can support educators to understand what parts of the scene learners already have explored (exploration visualization). In a user study, we show that our participants preferred a volume-based rendering and a view-in-view overlay solution for view visualizations. Furthermore, we show that our participants tended to use combinations of different view visualizations.

scholarly journals Transverse Chromatic Aberrations in Virtual Reality Devices

Frameless ◽  
2019 ◽  
Vol 1 (1) ◽  
pp. 1-4
Author(s):  
Ryan Beams ◽  
◽  
Wei-Chung Cheng ◽  
Andrea S. Kim ◽  
Aldo Badano ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Image Quality ◽  
Relative Size ◽  
Chromatic Aberration ◽  
Field Of View ◽  
Test Results ◽  
Optical Performance ◽  
Color Changes ◽  
Head Mounted Display ◽  
Chromatic Aberrations

We demonstrate a method for measuring the transverse chromatic aberration (TCA) in a virtual reality head-mounted display (VR HMD). This procedure was used to characterize the optical performance of the Oculus Go VR HMD. Results show a measurable TCA for angles larger than approximately 6◦ from the center of the field of view. TCA can be thought of as a wavelength dependent magnification, and as a result, the relative size of objects vary based on the rendering color. In addition, this leads to color changes in the image due to mixing with neighboring pixels, which impacts image quality. The test results for the Oculus Go show promise for characterizing TCA across different HMDs.

Numerical analysis of shift error in X-ray phase contrast imaging for large field of view

2017 ◽  
Vol 34 (1) ◽  
pp. 8
Author(s):  
Jianheng Huang ◽  
Yaohu Lei ◽  
Xin Liu ◽  
Jinchuan Guo ◽  
Ji Li ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Phase Contrast ◽  
Field Of View ◽  
Phase Contrast Imaging ◽  
Large Field ◽  
Contrast Imaging ◽  
X Ray
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