scholarly journals Comparison of Stride Split Based on Minimum Position of Withers/Sacrum and Fetlock Optical Markers in Horses with Varying Degree of Lameness

2016 ◽  
Vol 48 ◽  
pp. 37-37
Keyword(s):  
Optical Markers ◽  
Minimum Position

Intellectual control system for spacecraft rendezvous and docking based on active optical markers and its laboratory prototyping

2015 ◽  
Vol 21 (2(93)) ◽  
pp. 53-55
Author(s):  
V.B. Taranenko ◽  
◽  
R.A. Lymarenko ◽  
V.A. Topolnikov ◽  
V.A. Yatsenko ◽  
...  
Keyword(s):  
Control System ◽  
Intellectual Control ◽  
Optical Markers ◽  
Rendezvous And Docking

scholarly journals EP-1757: Intra-fraction patient movements during SBRT: CBCT vs Surface Optical Markers

2016 ◽  
Vol 119 ◽  
pp. S823-S824
Author(s):  
P. Tabarelli De Fatis ◽  
A. Fassi ◽  
M. Liotta ◽  
I. Meaglia ◽  
P. Porcu ◽  
...  
Keyword(s):  
Surface Optical ◽  
Optical Markers

scholarly journals Virtual Object Position Manipulation Using ARToolKit

2015 ◽  
Vol 1 (2) ◽  
pp. 306
Author(s):  
Hoger Mahmud Hussen
Keyword(s):  
Augmented Reality ◽  
Target Position ◽  
Virtual Object ◽  
Design Solution ◽  
Test Cases ◽  
Current Version ◽  
Virtual Objects ◽  
Additional Information ◽  
Education And Health ◽  
Optical Markers

In this paper the outcome of a project is presented that aims to modify and improve one of the most widely used Augmented Reality tools. Augmented reality (AR), is a fast growing area of virtual reality research. Augmented Reality (AR) is a newly emerging technology by which user’s view of the real world is augmented with additional information from a computer model. ARToolKit is one of the most widely used toolkits for Augmented Reality applications. The toolkit tracks optical markers and overlays virtual objects on the markers. In the current version of the toolkit the overlaid object is stationary or loops regardless of the optical target position, this means that the overlaid object cannot be animated or changed based on the movement of the optical target. The aim is to improve the toolkit, therefore a design solution to modify it were designed and implement so that users can manipulate the position of the overlaid virtual object, through movements of the optical target. The design solution focuses on developing a mathematically based links between the position of the optical target and the overlaid virtual object. To test the solution test cases were developed and the results show that the design solution is effective and the principal idea can be used to develop many applications in different sectors such as education and health.

Soccer is Harder Than Football

2015 ◽  
Vol 26 (04) ◽  
pp. 477-486
Author(s):  
Jan Christensen ◽  
Anders Nicolai Knudsen ◽  
Kim S. Larsen
Keyword(s):  
Np Complete ◽  
Minimum Position

It is known that deciding whether or not a team in a soccer tournament in progress can still win or, more generally, can obtain a certain position is NP-complete. We show that deciding whether or not a team is guaranteed a certain minimum position is coNP-complete. We also show that deciding with regards to goal difference, the standard tie-breaker for teams having the same number of points, whether or not a team can reach a certain position is NP-complete.

scholarly journals Real-Time Multi-person Motion Capture from Multi-view Video and IMUs

2019 ◽  
Vol 128 (6) ◽  
pp. 1594-1611
Author(s):  
Charles Malleson ◽  
John Collomosse ◽  
Adrian Hilton
Keyword(s):  
Real Time ◽  
Motion Capture ◽  
Axial Rotation ◽  
Time Motion ◽  
Background Segmentation ◽  
Measurement Units ◽  
Multi Person Tracking ◽  
Total Capture ◽  
Optical Markers ◽  
Indoor And Outdoor

AbstractA real-time motion capture system is presented which uses input from multiple standard video cameras and inertial measurement units (IMUs). The system is able to track multiple people simultaneously and requires no optical markers, specialized infra-red cameras or foreground/background segmentation, making it applicable to general indoor and outdoor scenarios with dynamic backgrounds and lighting. To overcome limitations of prior video or IMU-only approaches, we propose to use flexible combinations of multiple-view, calibrated video and IMU input along with a pose prior in an online optimization-based framework, which allows the full 6-DoF motion to be recovered including axial rotation of limbs and drift-free global position. A method for sorting and assigning raw input 2D keypoint detections into corresponding subjects is presented which facilitates multi-person tracking and rejection of any bystanders in the scene. The approach is evaluated on data from several indoor and outdoor capture environments with one or more subjects and the trade-off between input sparsity and tracking performance is discussed. State-of-the-art pose estimation performance is obtained on the Total Capture (mutli-view video and IMU) and Human 3.6M (multi-view video) datasets. Finally, a live demonstrator for the approach is presented showing real-time capture, solving and character animation using a light-weight, commodity hardware setup.

scholarly journals Nanometals and Quantum Dots as Optical Markers in Biophysics

2010 ◽  
Vol 98 (3) ◽  
pp. 583a
Author(s):  
Geoffrey F. Strouse ◽  
Tim Logan ◽  
Steven Hira
Keyword(s):  
Quantum Dots ◽  
Optical Markers

scholarly journals Tendon Strain Measurements With Dynamic Ultrasound Images: Evaluation of Digital Image Correlation

2012 ◽  
Vol 134 (2) ◽  
Author(s):  
Gregory Okotie ◽  
Sarah Duenwald-Kuehl ◽  
Hirohito Kobayashi ◽  
Mon-Ju Wu ◽  
Ray Vanderby
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Strain Measurement ◽  
Optical Tracking ◽  
Image Correlation ◽  
Image Texture ◽  
Ultrasound Images ◽  
Tendon Strain ◽  
Optical Markers

Strain is an essential metric in tissue mechanics. Strains and strain distributions during functional loads can help identify damaged and pathologic regions as well as quantify functional compromise. Noninvasive strain measurement in vivo is difficult to perform. The goal of this in vitro study is to determine the efficacy of digital image correlation (DIC) methods to measure strain in B-mode ultrasound images. The Achilles tendons of eight male Wistar rats were removed and mechanically cycled between 0 and 1% strain. Three cine video images were captured for each specimen: (1) optical video for manual tracking of optical markers; (2) optical video for DIC tracking of optical surface markers; and (3) ultrasound video for DIC tracking of image texture within the tissue. All three imaging modalities were similarly able to measure tendon strain during cyclic testing. Manual/ImageJ-based strain values linearly correlated with DIC (optical marker)-based strain values for all eight tendons with a slope of 0.970. DIC (optical marker)-based strain values linearly correlated with DIC (ultrasound texture)-based strain values for all eight tendons with a slope of 1.003. Strain measurement using DIC was as accurate as manual image tracking methods, and DIC tracking was equally accurate when tracking ultrasound texture as when tracking optical markers. This study supports the use of DIC to calculate strains directly from the texture present in standard B-mode ultrasound images and supports the use of DIC for in vivo strain measurement using ultrasound images without additional markers, either artificially placed (for optical tracking) or anatomically in view (i.e., bony landmarks and/or muscle-tendon junctions).

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