Effects of dynamic field-of-view restriction on cybersickness and presence in HMD-based virtual reality

In the present paper, we discuss the design of a projection system with curved display and its enhancement by variably adjusting the curvature. We demonstrate that the focal surface curvature varies significantly with a change of the object position and that it can easily be computed with the Seidel aberration theory. Using this analytically derived curvature value as the starting point, we optimise a refocusable projection system with 90 ° field of view and F / # = 6.2 . It is demonstrated that such a system can provide stable image quality and illumination when refocusing from infinity to 1.5 m. The gain in spatial resolution is as high as 1.54 times with respect to a flat focal surface. Furthermore, we prove that a silicon die can be curved to the required shape with a safety factor of 4.3 in terms of the mechanical stress. Finally, it is shown that the developed system can be used in a virtual reality headset providing high resolution, low distortion and a flexible focusing mode.

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Fast, robust dynamic field-of-view adjustment for iterative reconstruction of dedicated breast CT

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC) ◽

10.1109/nssmic.2013.6829370 ◽

2013 ◽

Keyword(s):

Iterative Reconstruction ◽

Field Of View ◽

Breast Ct ◽

Dynamic Field ◽

Dedicated Breast Ct

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A panoramic synthetic vision model for improving collision avoidance in crowd simulation

Journal of Interactive Systems ◽

10.5753/jis.2015.659 ◽

2015 ◽

Vol 6 (2) ◽

pp. 1

Author(s):

Ricardo Bustamante de Queiroz ◽

Teófilo Dutra ◽

Creto Vidal ◽

Joaquim Cavalcante-Neto

Keyword(s):

Virtual Reality ◽

Visual Perception ◽

Collision Avoidance ◽

Vision System ◽

Crowd Simulation ◽

Field Of View ◽

Panoramic View ◽

Natural Manner ◽

Synthetic Vision ◽

The Common

Crowd Simulation is very important in many virtual reality applications, because it improves the sense of immersion of the users by making the population of agents in the environment to move as real crowds do. Recently, models for simulating crowds, in which each agent is equipped with a synthetic vision system, have shown interesting results regarding the natural manner in which the agents navigate inside the environment thanks to their visual perception. In this article, we propose an upgrade to the agent’s visual system with a panoramic view in order to allow an agent to expand its vision beyond the limit of 180o imposed by the common projection provided by rendering APIs. Also, we analyze different parameters, which are used to define the field of view, to investigate the influence they have on the agent’s behavior. The impacts that those changes may cause on the efficiency of the algorithms are also analysed. A visible change on the agent’s behavior is achieved by using the technique, with a slight loss of performance.

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Virtual Reality Camera Technology Facilitates Sampling of Interactions Between Reef Piscivores and Prey

Marine Technology Society Journal ◽

10.4031/mtsj.55.2.1 ◽

2021 ◽

Vol 55 (2) ◽

pp. 54-63

Author(s):

Peter J. Auster ◽

Lissa Giacalone

Keyword(s):

Virtual Reality ◽

Species Interactions ◽

Food Habit ◽

Field Of View ◽

Overlying Water ◽

Predator Prey ◽

Video Cameras ◽

Direct Observations ◽

Observer Effects ◽

Subtropical Reefs

Abstract Predation is an important process influencing the structure of fish communities. There are multiple approaches used to quantify predatory interactions, and all approaches are beneficial but have their limitations. For example, food habit studies only represent results of successful predation events, direct observations by divers are time limited by both depth and temperature as well as observer effects, acoustic approaches cannot directly identify species, and video has field-of-view constraints when using standard cameras. While no approach is without constraints, the recent availability of small off-the-shelf virtual reality (VR) video cameras that can be used in marine environments offers a more spatially comprehensive field-of-view for conducting studies of community composition and species interactions both on the seafloor and in the overlying water column. Here, we demonstrate an approach for collection and analysis of data from stationary VR video to quantify predator-prey interactions at subtropical reefs in Gray’s Reef National Marine Sanctuary (NW Atlantic). This approach does not substitute for other widely used census and behavioral research approaches but augments those with unique analytical products and interpretation.

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