Design of lighting system for head-mounted display device

2021 ◽  
Author(s):  
Chunlei Xing ◽  
Yujie Chen ◽  
Feng Xu ◽  
Suodong Ma
Keyword(s):  
Display Device ◽  
Lighting System ◽  
Head Mounted Display

scholarly journals Markerless Augmented Reality via Stereo Video See-Through Head-Mounted Display Device

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Chung-Hung Hsieh ◽  
Jiann-Der Lee
Keyword(s):  
Augmented Reality ◽  
Physical Space ◽  
Target Surface ◽  
Surface Registration ◽  
Display Device ◽  
Localization Method ◽  
Head Mounted Display ◽  
Stereo Video ◽  
Camera Localization ◽  
Random Sample Consensus

Conventionally, the camera localization for augmented reality (AR) relies on detecting a known pattern within the captured images. In this study, a markerless AR scheme has been designed based on a Stereo Video See-Through Head-Mounted Display (HMD) device. The proposed markerless AR scheme can be utilized for medical applications such as training, telementoring, or preoperative explanation. Firstly, a virtual model for AR visualization is aligned to the target in physical space by an improved Iterative Closest Point (ICP) based surface registration algorithm, with the target surface structure reconstructed by a stereo camera pair; then, a markerless AR camera localization method is designed based on the Kanade-Lucas-Tomasi (KLT) feature tracking algorithm and the Random Sample Consensus (RANSAC) correction algorithm. Our AR camera localization method is shown to be better than the traditional marker-based and sensor-based AR environment. The demonstration system was evaluated with a plastic dummy head and the display result is satisfactory for a multiple-view observation.

The Optical System Design of Head-Mounted Display

2013 ◽  
Vol 718-720 ◽  
pp. 1542-1546
Author(s):  
Xiao Feng Wang ◽  
Lu Yin ◽  
Jian Xin Li ◽  
Ri Hong Zhu ◽  
Rong Ji
Keyword(s):  
System Design ◽  
Optical System ◽  
Structural Design ◽  
Small Volume ◽  
Electronic System ◽  
Display Device ◽  
Display System ◽  
Virtual Reality Technology ◽  
Optical System Design ◽  
Head Mounted Display

With the development of the high resolution micro display device and the virtual reality technology, head mounted display is now going to a commercial age. And the products of their own are also put forward to some special requirements: small volume, light quality, simple operation, object popularity. As the requirements at a suit, it needs excellent optical system design, electronic system design, structural design and many other fields together. In order to solve this problem, we use the software designer Zemax and compact a portable structure optical system, combined with 3D imaging hardware decoding technology, preliminary design a set of glasses declined display system. The system has a watching feeling as you see a 80 inch screen at 3 meters away.

scholarly journals Altered postural stability in elderly women following a single session of head-mounted display virtual reality

2021 ◽  
Vol 23 (1) ◽  
Author(s):  
Błażej Cieślik ◽  
Anna Serweta ◽  
Sara Federico ◽  
Joanna Szczepańska-Gieracha
Keyword(s):  
Virtual Reality ◽  
Postural Stability ◽  
Elderly Women ◽  
Sagittal Plane ◽  
Display Device ◽  
Centre Of Pressure ◽  
Single Session ◽  
Head Mounted Display ◽  
Significant Difference ◽  
Almost All

Purpouse: The aim of this study was to evaluate the effect of a single session of head-mounted display virtual reality on postural stability in elderly women. Methods: Forty-seven female subjects underwent a 20-minute virtual reality session. The mean age of the subjects was 70.12 years. As an immersive source, we used a relaxing virtual reality game with a head-mounted display device. The postural stability test was conducted using a Nintendo Wii force plate. Participants completed a set of three 30-s trials in which they took a quiet bipedal eyes-open stance while standing on a hard surface: before the virtual reality session, immediately after the virtual reality session, and 2 minutes after the virtual reality session. Centre of pressure parameters were analysed in the sagittal and frontal planes. Results: Analysing the results obtained immediately after the virtual reality session, significant differences were observed in almost all examined parameters. In the sagittal plane, centre of pressure path velocity increased by 10% (p < 0.01) and path standard deviation by 15% (p < 0.05). In the frontal plane, centre of pressure path velocity increased by 14% (p < 0.01). After 2 minutes, all examined parameters showed no significant difference compared to before the virtual reality session. Conclusions: Immediately after the virtual reality session, there was an increase in almost all examined parameters. However, after 2 minutes, all examined parameters had returned to baseline. Therefore, to reduce fall risk after a virtual reality session, it is recommended that the subject spend at least 2 minutes in a sitting position.

scholarly journals Realtime Online Daily Living Activity Recognition Using Head-Mounted Display

2017 ◽  
Vol 11 (3) ◽  
pp. 67 ◽  
Author(s):  
Fais Al Huda ◽  
Herman Tolle ◽  
Rosa Andrie Asmara
Keyword(s):  
Activity Recognition ◽  
Daily Living ◽  
Great Accuracy ◽  
Display Device ◽  
Google Glass ◽  
Daily Living Activity ◽  
Head Mounted Display ◽  
Everyday Activities ◽  
Research Fields ◽  
The Military

Human activity recognition is one of the popular research fields. The results of this study can be applied to many other fields such as the military, commercialism, and health. With the advent of the wearable head mounted display device mainly like google glass raises the possibility of this research. In this study tries to identify everyday activities are often called the ambient activity. Development of the system is done online using a smartphone and a head mounted display. The system produces an accuracy above 90%, which can be concluded that the system was able to recognize the activities with great accuracy.

Assessment of various display devices on a virtual reality-based hand rehabilitation system

Robotica ◽  
2004 ◽  
Vol 22 (1) ◽  
pp. 9-14 ◽  
Author(s):  
Wei-Shin Huang ◽  
Chang-Yih Shing ◽  
Chin-Ping Fung ◽  
Tien-Yow Chuang ◽  
Ming-Chang Jeng ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Three Dimensional ◽  
Display Device ◽  
Hand Rehabilitation ◽  
Data Glove ◽  
Display Devices ◽  
Head Mounted Display ◽  
Significant Difference ◽  
Rehabilitation System ◽  
Monitor Group

The purpose of the present study is to assess the effect of an auxiliary lateral image and display devices on manipulation performance in a virtual reality-based hand rehabilitation system. The system consists of a personal computer, a tracker, a data glove, and a display device. For this study, a projector, a monitor, and a head-mounted display were respectively used as the display devices to present three-dimensional virtual environments. Twelve volunteers were recruited to take a pick-and-place procedure at different levels of difficulty. Task time and collision frequency were the parameters used to evaluate the manipulation performance. It was found that the presence of an auxiliary lateral image was a significant factor only for the performance of the projector group and the monitor group. In addition, no statistically significant difference was found in the comparison between the projector group and the monitor group.

An Evaluation of the Long Duration use of an Head Mounted Display

2008 ◽  
Author(s):  
Harry Litaker ◽  
Shelby Thompson ◽  
Ronald Archer
Keyword(s):  
Head Mounted Display ◽  
Long Duration
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