Anchor Placement In Indoor Object Tracking Systems For Virtual Reality Simulations

2018 ◽  
Author(s):  
Marco Gribaudo ◽  
Pietro Piazzolla ◽  
Mauro Iacono
Keyword(s):  
Virtual Reality ◽  
Object Tracking ◽  
Tracking Systems

Integration of Tracking Systems for the Development of Virtual Reality Applications

2010 ◽  
Vol 8 (6) ◽  
pp. 714-721 ◽  
Author(s):  
Daniel Faustino Lacerda de Souza ◽  
Liliane dos Santos Machado ◽  
Ronei Marcos de Moraes
Keyword(s):  
Virtual Reality ◽  
Tracking Systems

scholarly journals Mobile virtual reality distraction reduces needle pain and stress in children?

2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Joanna Ewa Piskorz ◽  
Marcin Czub ◽  
Beata Šulžickaja ◽  
Katarzyna Kiliś-Pstrusińska
Keyword(s):  
Virtual Reality ◽  
Object Tracking ◽  
Pediatric Nephrology ◽  
Multiple Object Tracking ◽  
Control Group ◽  
Medical Treatments ◽  
Multiple Object ◽  
Perceived Pain ◽  
Lower Pain ◽  
Study Participants

Virtual reality (VR) technology is a remarkably effective method for distracting attention from painful stimuli. This is particularly important for children who undergo painful and stressful medical treatments. The main aim of the present study was to examine whether the type of VR distraction had an effect on reducing pain and stress in children during a short blood sampling treatment, and to investigate the effectiveness of mobile VR.Fifty-seven patients of a pediatric nephrology clinic (Mage = 12, range: 7–17) participated in a between-group experimental design study. Participants in the treatment group (active vs passive VR) underwent a venipuncture procedure with VR distraction. Mobile VR (Samsung gear) was used in this study. Participants in the active VR experimental condition played a game based on the multiple object tracking task paradigm. In the passive VR experimental condition, participants watched a film similar to the presented game. All participants rated their pain and stress levels on the Visual Analogue Scale and completed a short questionnaire.Both VR groups reported significantly lower pain and stress intensity than the control group. When comparing the two experimental groups, no statistically significant differences were found, although participants differed in their level of perceived pain and stress, with greater benefits in the active VR. The present study focused on comparing the effect sizes of active and passive VR interventions. Additionally, the study confirmed feasibility of using Multiple Object Tracking paradigm as a method of attention distraction in VR.

Immersive Multiple Object Tracking Using Virtual Reality

2019 ◽  
pp. 449-453
Author(s):  
Astrid Kibleur ◽  
Morgan Le Chénéchal ◽  
Nicolas Benguigui ◽  
Jonas Chatel-Goldman
Keyword(s):  
Virtual Reality ◽  
Object Tracking ◽  
Multiple Object Tracking ◽  
Multiple Object

scholarly journals An Evaluation of Motion Trackers with Virtual Reality Sensor Technology in Comparison to a Marker-Based Motion Capture System Based on Joint Angles for Ergonomic Risk Assessment

Sensors ◽  
2021 ◽  
Vol 21 (9) ◽  
pp. 3145
Author(s):  
Jan P. Vox ◽  
Anika Weber ◽  
Karen Insa Wolf ◽  
Krzysztof Izdebski ◽  
Thomas Schüler ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Motion Capture ◽  
Risk Assessments ◽  
Motion Capture System ◽  
Tracking Systems ◽  
Joint Angles ◽  
Work Processes ◽  
Optical Motion ◽  
Optical Motion Capture ◽  
Ergonomic Risk

The reproduction and simulation of workplaces, and the analysis of body postures during work processes, are parts of ergonomic risk assessments. A commercial virtual reality (VR) system offers the possibility to model complex work scenarios as virtual mock-ups and to evaluate their ergonomic designs by analyzing motion behavior while performing work processes. In this study a VR tracking sensor system (HTC Vive tracker) combined with an inverse kinematic model (Final IK) was compared with a marker-based optical motion capture system (Qualisys). Marker-based optical motion capture systems are considered the gold standard for motion analysis. Therefore, Qualisys was used as the ground truth in this study. The research question to be answered was how accurately the HTC Vive System combined with Final IK can measure joint angles used for ergonomic evaluation. Twenty-six subjects were observed simultaneously with both tracking systems while performing 20 defined movements. Sixteen joint angles were analyzed. Joint angle deviations between ±6∘ and ±42∘ were identified. These high deviations must be considered in ergonomic risk assessments when using a VR system. The results show that commercial low-budget tracking systems have the potential to map joint angles. Nevertheless, substantial weaknesses and inaccuracies in some body regions must be taken into account. Recommendations are provided to improve tracking accuracy and avoid systematic errors.

scholarly journals Quality of Radar Direction-Finding via Conical Scanning

2021 ◽  
Vol 24 (5) ◽  
pp. 50-65
Author(s):  
A. D. Pluzhnikov ◽  
L. V. Kogteva ◽  
E. N. Pribludova ◽  
S. B. Sidorov ◽  
E. G. Chuzhaykin
Keyword(s):  
Mathematical Modeling ◽  
Object Tracking ◽  
Statistical Processing ◽  
Direction Finding ◽  
Tracking Systems ◽  
Tracking Errors ◽  
Dynamic Tracking ◽  
Quantitative Results ◽  
Variance Estimate ◽  
Angular Coordinates

Introduction. Conical scanning is applied for optimizing hardware resources in new devices, as well as when upgrading existing systems. All this explains the relevance of studying this type of direction finding systems.Aim. To adjust and complement the known calculation relations for the variance of direction finding results – an indicator of the quality (accuracy) of direction finding, as well as to determine the possibilities of optimizing direction finding and automatic object tracking processes.Materials and methods. Factors limiting the accuracy of direction finding via conical scanning were analyzed using spectral analysis. Mathematical modeling followed by statistical processing of quantitative results makes it possible to determine the conditions under which the influence of certain factors is predominant, as well as the conditions under which adjustment (completion) of the known calculation relations is required. The specified conditions are the errors at which the objects of direction finding are tracked. New calculation relations for the mentioned adjustment were determined by the methods of statistical radio engineering.Results. The validity of the calculation relations found is confirmed by mathematical modeling. Calculations and modeling lead to the need to optimize parameters for automatic object tracking systems.Conclusion. The study shows that, when choosing parameters for auto-tracking systems with conical scanning, it is important to implement object tracking not with minimal, but rather with optimized tracking errors in angular coordinates, which are to be estimated during direction finding. Moreover, the optimized errors (the values of static errors and the most probable values of the dynamic tracking errors) will require adjustment of the known analytical estimates for the variance of the direction finding results – the qualitative indicator of the direction finder (accuracy indicator). The determined analytical relationships allow such an adjustment to be performed, leading to an increased variance estimate by 10 dB.

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