scholarly journals RECREATING CULTURAL HERITAGE ENVIRONMENTS FOR VR USING PHOTOGRAMMETRY

2019 ◽  
Vol XLII-2/W9 ◽  
pp. 305-310 ◽  
Author(s):  
A. Dhanda ◽  
M. Reina Ortiz ◽  
A. Weigert ◽  
A. Paladini ◽  
A. Min ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Cultural Heritage ◽  
Real Time ◽  
Structure From Motion ◽  
Degrees Of Freedom ◽  
Six Degrees Of Freedom ◽  
Whole Space ◽  
Optimized Model ◽  
Normal Maps

<p><strong>Abstract.</strong> In this paper, we propose a workflow for recreating places of cultural heritage in Virtual Reality (VR) using structure from motion (SfM) photogrammetry. The unique texture of heritage places makes them ideal for full photogrammetric capture. An optimized model is created from the photogrammetric data so that it is small enough to render in a real-time environment. The optimized model, combined with mesh maps (texture maps, normal maps, etc.) looks like the original high detail model. The capture of a whole space makes it possible to create a VR experience with six degrees of freedom (6DoF) that allows the user to explore the historic place. Creating these experiences can bring people to cultural heritage that is either endangered or too remote for some people to access. The workflow described in this paper will be demonstrated with the case study of Myin-pya-gu, an 11th century temple in Bagan, Myanmar.</p>

Classification of motor errors to provide real-time feedback for sports coaching in virtual reality — A case study in squats and Tai Chi pushes

2018 ◽  
Vol 76 ◽  
pp. 47-59 ◽  
Author(s):  
Felix Hülsmann ◽  
Jan Philip Göpfert ◽  
Barbara Hammer ◽  
Stefan Kopp ◽  
Mario Botsch
Keyword(s):  
Virtual Reality ◽  
Real Time ◽  
Tai Chi ◽  
Sports Coaching

scholarly journals Applying Touchscreen Based Navigation Techniques to Mobile Virtual Reality with Open Clip-On Lenses

Electronics ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1448 ◽  
Author(s):  
Youngwon Ryan Kim ◽  
Hyeonah Choi ◽  
Minwook Chang ◽  
Gerard J. Kim
Keyword(s):  
Virtual Reality ◽  
Degrees Of Freedom ◽  
Head Rotation ◽  
Display Device ◽  
Interaction Technique ◽  
Six Degrees Of Freedom ◽  
3D Space ◽  
To Come ◽  
3D Applications ◽  
Navigation Method

Recently, a new breed of mobile virtual reality (dubbed as “EasyVR” in this work), has appeared in the form of conveniently clipping on a non-isolating magnifying lenses on the smartphone, still offering a reasonable level of immersion to using the isolated headset. Furthermore, such a form factor allows the fingers to touch the screen and select objects quite accurately, despite the finger(s) being seen unfocused over the lenses. Many navigation techniques have existed for both casual smartphone 3D applications using the touchscreen and immersive VR environments using the various controllers/sensors. However, no research has focused on the proper navigation interaction technique for a platform like EasyVR which necessitates the use of the touchscreen while holding the display device to the head and looking through the magnifying lenses. To design and propose the most fitting navigation method(s) with EasyVR, we mixed and matched the conventional touchscreen based and headset oriented navigation methods to come up with six viable navigation techniques—more specifically for selecting the travel direction and invoking the movement itself—including the use of head-rotation, on-screen keypads/buttons, one-touch teleport, drag-to-target, and finger gestures. These methods were experimentally compared for their basic usability and the level of immersion in navigating in 3D space with six degrees of freedom. The results provide a valuable guideline for designing/choosing the proper navigation method under different navigational needs of the given VR application.

CAVE: Making Collective Virtual Narrative: Best Paper Award

Leonardo ◽  
2019 ◽  
Vol 52 (4) ◽  
pp. 349-356 ◽  
Author(s):  
Kris Layng ◽  
Ken Perlin ◽  
Sebastian Herscher ◽  
Corinne Brenner ◽  
Thomas Meduri
Keyword(s):  
Virtual Reality ◽  
Degrees Of Freedom ◽  
Paper Award ◽  
Six Degrees Of Freedom ◽  
The Social ◽  
Future Path ◽  
Shared Narrative ◽  
Specific Pairing

CAVE is a shared narrative six degrees of freedom (6DoF) virtual reality experience. In 3.5 days, 1,927 people attended its premiere at SIGGRAPH 2018. Thirty participants at a time each saw and heard the same narrative from their own individual location in the room, as they would when attending live theater. CAVE set out to disruptively change how audiences collectively experience immersive art and entertainment. Inspired by the social gatherings of theater and cinema, CAVE resonated with viewers in powerful and meaningful ways. Its specific pairing of colocated audiences and physically shared immersive narrative suggests a possible future path for shared cinematic experiences.

scholarly journals Ultraprecision Real-Time Displacements Calculation Algorithm for the Grating Interferometer System

Sensors ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 2409 ◽  
Author(s):  
Weinan Ye ◽  
Ming Zhang ◽  
Yu Zhu ◽  
Leijie Wang ◽  
Jinchun Hu ◽  
...  
Keyword(s):  
Real Time ◽  
Affine Transformation ◽  
Degrees Of Freedom ◽  
Diffraction Spot ◽  
Calculation Algorithm ◽  
Six Degrees Of Freedom ◽  
Time Calculation ◽  
Interference Signals ◽  
Grating Interferometer ◽  
Optical Paths

Grating interferometry is an environmentally stable displacement measurement technique that has significant potential for identifying the position of the wafer stage. A fast and precise algorithm is required for real-time calculation of six degrees-of-freedom (DOF) displacement using phase shifts of interference signals. Based on affine transformation, we analyze diffraction spot displacement and changes in the internal and external effective optical paths of the grating interferometer caused by the displacement of the wafer stage (DOWS); then, we establish a phase shift-DOWS model. To solve the DOWS in real time, we present a polynomial approximation algorithm that uses the frequency domain characteristics of nonlinearities to achieve model reduction. The presented algorithm is verified by experiment and ZEMAX simulation.

Comparisons of Turning Abilities of Submarine With Different Rudder Configurations

2018 ◽  
Author(s):  
Dakui Feng ◽  
Xuanshu Chen ◽  
Hao Liu ◽  
Zhiguo Zhang ◽  
Xianzhou Wang
Keyword(s):  
Real Time ◽  
Degrees Of Freedom ◽  
Control Device ◽  
Body Motion ◽  
The Real ◽  
Six Degrees Of Freedom ◽  
Overlapping Grids ◽  
Free Running ◽  
Turning Radius ◽  
Time Changes

Submarine is usually equipped with two different control device arrangements, namely a cruciform and a X rudder configuration. In this paper, numerical simulations of the DARPA Suboff submarine and its retrofitted submarine with a X rudder configuration are presented. Turning simulations in model scale were studied to compare the turning abilities of the two different control device arrangements. The computations were performed with a house viscous CFD solver based on the conservative finite difference method. In the solver, RANS equation are solved coupled with six degrees of freedom (6DOF) solid body motion equations of the submarine in real time. The structured dynamic overlapping grids were used to simulate the real-time changes of the attitude of the submarine and the rotation of the rudder. The volume force method was used to replace the real propeller to realize the self-propelled movement of submarine. In the free running maneuvering simulations, the submarines move at the same initial velocity and rudder angle, restricted to the horizontal plane with four degrees of freedom (4DOF). Comparisons of the trajectory and kinematic parameters including relative turning radius and turning period between the two cases were presented in this paper. The results show that, compared with the cruciform rudder configuration, the X rudder configuration has obvious advantages for submarine in the turning abilities.

A 2(3-RRPS) parallel manipulator inspired by Gough–Stewart platform

Robotica ◽  
2012 ◽  
Vol 31 (3) ◽  
pp. 381-388 ◽  
Author(s):  
Jaime Gallardo-Alvarado ◽  
Mario A. García-Murillo ◽  
Eduardo Castillo-Castaneda
Keyword(s):  
Parallel Manipulator ◽  
Degrees Of Freedom ◽  
Screw Theory ◽  
Parallel Manipulators ◽  
Forward Kinematics ◽  
Triangular Prism ◽  
Input Output ◽  
Six Degrees Of Freedom ◽  
Moving Platform

SUMMARYThis study addresses the kinematics of a six-degrees-of-freedom parallel manipulator whose moving platform is a regular triangular prism. The moving and fixed platforms are connected to each other by means of two identical parallel manipulators. Simple forward kinematics and reduced singular regions are the main benefits offered by the proposed parallel manipulator. The Input–Output equations of velocity and acceleration are systematically obtained by resorting to reciprocal-screw theory. A case study, which is verified with the aid of commercially available software, is included with the purpose to exemplify the application of the method of kinematic analysis.

scholarly journals Testing of a MEMS Dynamic Inclinometer Using the Stewart Platform

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4233 ◽  
Author(s):  
Zhihua Liu ◽  
Chenguang Cai ◽  
Ming Yang ◽  
Ying Zhang
Keyword(s):  
Mechanical System ◽  
Real Time ◽  
Degrees Of Freedom ◽  
Cross Coupling ◽  
Micro Electro Mechanical System ◽  
Stewart Platform ◽  
Forward Kinematics ◽  
Six Degrees Of Freedom ◽  
Position And Orientation ◽  
The Cross

The micro-electro-mechanical system (MEMS) dynamic inclinometer integrates a tri-axis gyroscope and a tri-axis accelerometer for real-time tilt measurement. The Stewart platform has the ability to generate six degrees of freedom of spatial orbits. The method of applying spatial orbits to the testing of MEMS inclinometers is investigated. Inverse and forward kinematics are analyzed for controlling and measuring the position and orientation of the Stewart platform. The Stewart platform is controlled to generate a conical motion, based on which the sensitivities of the gyroscope, accelerometer, and tilt sensing are determined. Spatial positional orbits are also generated in order to obtain the tilt angles caused by the cross-coupling influence. The experiment is conducted to show that the tested amplitude frequency deviations of the gyroscope and tilt sensing sensitivities between the Stewart platform and the traditional rotator are less than 0.2 dB and 0.1 dB, respectively.

At-Risk World Heritage and Virtual Reality Visualization for Cyber-Archaeology

2020 ◽  
pp. 151-171
Author(s):  
Thomas E. Levy ◽  
Connor Smith ◽  
Kristin Agcaoili ◽  
Anish Kannan ◽  
Avner Goren ◽  
...  
Keyword(s):  
At Risk ◽  
Virtual Reality ◽  
Cultural Heritage ◽  
Middle Eastern ◽  
Dead Sea ◽  
Economic Benefits ◽  
High Definition ◽  
Heritage Site ◽  
Temple Mount

In this chapter, the issue of at-risk cultural heritage in the Middle East is addressed through the application of cyber-archaeology tools for data capture and dissemination. Working with an economic model to create a Heritage Asset District in the environs of Jerusalem, virtual reality for personal head-mounted devices and immersive CAVE platforms are used to help create high-value cultural heritage attractions designed to attract visitors to the district, thereby generating economic benefits. In the case study presented here, the district focuses on the Kidron Valley, which has its origin near the Temple Mount in the Old City of Jerusalem, and follows the river flowing eastward through the Judean Desert, where it empties into the Dead Sea. The most prominent cultural heritage site along the wadi (riverbed) is the Mar Saba Greek Orthodox monastery, dating to the fifth century CE. A helium-balloon photographic platform with high-definition photography and Structure from Motion (SfM) processing was used to create a 3D model of this impressive site that could be used for VR demonstrations. The demo is then made available over the MedArchNet (http://medarchnet.calit2.net/) online digital atlas to enable public engagement with Middle Eastern cultural heritage. This research is part of a University of California Office of the President Catalyst Grant concerning “At-Risk Cultural Heritage and the Digital Humanities.”

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