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Author = McDonald, John;
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Displaying Results 1 - 25 of 79 on page 1 of 4
Marked
Mark
3D Mapping, Localisation and Object Retrieval using Low Cost Robotic Platforms: A Robotic Search Engine for the Real-World
(2014)
Whelan, Thomas; Kaess, Michael; Finman, R.; Fallon, M.F.; Johannsson, Hordur; Leonard, ...
3D Mapping, Localisation and Object Retrieval using Low Cost Robotic Platforms: A Robotic Search Engine for the Real-World
(2014)
Whelan, Thomas; Kaess, Michael; Finman, R.; Fallon, M.F.; Johannsson, Hordur; Leonard, John J.; McDonald, John
Abstract:
In this paper we present work in progress on the development of a low-cost autonomous robotic platform that integrates multiple state-of-the-art techniques in RGB-D perception to form a system capable of completing a real-world task in an entirely autonomous fashion. The task we set out to complete is determining the location of a preselected object within the physical world. This experiment requires a robotic framework with a number of capabilities including autonomous exploration, dense real-time localisation and mapping, object detection, path planning and motion control.
http://mural.maynoothuniversity.ie/8310/
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6-DOF Multi-session Visual SLAM using Anchor Nodes
(2011)
McDonald, John; Kaess, Michael; Cadena, Cesar; Neira, Jose; Leonard, John J.
6-DOF Multi-session Visual SLAM using Anchor Nodes
(2011)
McDonald, John; Kaess, Michael; Cadena, Cesar; Neira, Jose; Leonard, John J.
Abstract:
This paper describes a system for performing multisession visual mapping in large-scale environments. Multi-session mapping considers the problem of combining the results of multiple Simultaneous Localisation and Mapping (SLAM) missions performed repeatedly over time in the same environment. The goal is to robustly combine multiple maps in a common metrical coordinate system, with consistent estimates of uncertainty. Our work employs incremental Smoothing and Mapping (iSAM) as the underlying SLAM state estimator and uses an improved appearance-based method for detecting loop closures within single mapping sessions and across multiple sessions. To stitch together pose graph maps from multiple visual mapping sessions, we employ spatial separator variables, called anchor nodes, to link together multiple relative pose graphs. We provide experimental results for multi-session visual mapping in the MIT Stata Center, demonstrating key capabilities that will serve as a foundation for future...
http://mural.maynoothuniversity.ie/6497/
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A Benchmark for RGB-D Visual Odometry, 3D Reconstruction and SLAM
(2014)
Handa, Ankur; Whelan, Thomas; McDonald, John; Davison, Andrew J.
A Benchmark for RGB-D Visual Odometry, 3D Reconstruction and SLAM
(2014)
Handa, Ankur; Whelan, Thomas; McDonald, John; Davison, Andrew J.
Abstract:
We introduce the Imperial College London and National University of Ireland Maynooth (ICL-NUIM) dataset for the evaluation of visual odometry, 3D reconstruction and SLAM algorithms that typically use RGB-D data. We present a collection of handheld RGB-D camera sequences within synthetically generated environments. RGB-D sequences with perfect ground truth poses are provided as well as a ground truth surface model that enables a method of quantitatively evaluating the final map or surface reconstruction accuracy. Care has been taken to simulate typically observed real-world artefacts in the synthetic imagery by modelling sensor noise in both RGB and depth data. While this dataset is useful for the evaluation of visual odometry and SLAM trajectory estimation, our main focus is on providing a method to benchmark the surface reconstruction accuracy which to date has been missing in the RGB-D community despite the plethora of ground truth RGB-D datasets available.
http://mural.maynoothuniversity.ie/8309/
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A Framework for Continuous Multimodal Sign Language Recognition
(2009)
Kelly, Daniel; Delannoy, Jane Reilly; McDonald, John; Markham, Charles
A Framework for Continuous Multimodal Sign Language Recognition
(2009)
Kelly, Daniel; Delannoy, Jane Reilly; McDonald, John; Markham, Charles
Abstract:
We present a multimodal system for the recognition of manual signs and non-manual signals within continuous sign language sentences. In sign language, information is mainly conveyed through hand gestures (Manual Signs). Non-manual signals, such as facial expressions, head movements, body postures and torso movements, are used to express a large part of the grammar and some aspects of the syntax of sign language. In this paper we propose a multichannel HMM based system to recognize manual signs and non-manual signals. We choose a single non-manual signal, head movement, to evaluate our framework when recognizing non-manual signals. Manual signs and non-manual signals are processed independently using continuous multidimensional HMMs and a HMM threshold model. Experiments conducted demonstrate that our system achieved a detection ratio of 0.95 and a reliability measure of 0.93.
http://mural.maynoothuniversity.ie/8338/
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A high-performance portable abstract interface for explicit SIMD vectorization
(2017)
Karpiński, Przemysław; McDonald, John
A high-performance portable abstract interface for explicit SIMD vectorization
(2017)
Karpiński, Przemysław; McDonald, John
Abstract:
This work establishes a scalable, easy to use and efficient approach for exploiting SIMD capabilities of modern CPUs, without the need for extensive knowledge of architecture specific instruction sets. We provide a description of a new API, known as UME::SIMD, which provides a flexible, portable, type-oriented abstraction for SIMD instruction set architectures. Requirements for such libraries are analysed based on existing, as well as proposed future solutions. A software architecture that achieves these requirements is explained, and its performance evaluated. Finally we discuss how the API fits into the existing, and future software ecosystem.
http://mural.maynoothuniversity.ie/12008/
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A New Hough Transform for the Detection of Arbitrary 3-Dimensional Objects
(1998)
McDonald, John; Vernon, David
A New Hough Transform for the Detection of Arbitrary 3-Dimensional Objects
(1998)
McDonald, John; Vernon, David
Abstract:
The existing Generalised Hough Transform, although altered to cater for scaling and rotation of the object in the plane, fails to detect the object under rotations out of the plane. This is due to the lack of 3-dimensional information contained in the 2-dimensional template image. In this paper we present a new Hough Transform, known as the Surface Normal Hough Transform (SNHT), which using a suitable 2-dimensional surface representation, transforms a set of surface normal to a surface parameter space. The effect of the SNHT is to map point sets representing a surface in the input space, to a peak in the parameter space. The coordinates of this peak parameterise the given surface and hence allow for post invariant object detection and localisation.
http://mural.maynoothuniversity.ie/8268/
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A person independent system for recognition of hand postures used in sign language
(2010)
Kelly, Daniel; McDonald, John; Markham, Charles
A person independent system for recognition of hand postures used in sign language
(2010)
Kelly, Daniel; McDonald, John; Markham, Charles
Abstract:
We present a novel user independent framework for representing and recognizing hand postures used in sign language. We propose a novel hand posture feature, an eigenspace Size Function, which is robust to classifying hand postures independent of the person performing them. An analysis of the discriminatory properties of our proposed eigenspace Size Function shows a significant improvement in performance when compared to the original unmodified Size Function. We describe our support vector machine based recognition framework which uses a combination of our eigenspace Size Function and Hu moments features to classify different hand postures. Experiments, based on two different hand posture data sets, show that our method is robust at recognizing hand postures independent of the person performing them. Our method also performs well compared to other user independent hand posture recognition systems.
http://mural.maynoothuniversity.ie/8289/
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A Projection System for Real World Three-Dimensional Objects Using Spatial Light Modulators
(2008)
Gopinathan, Unnikrishnan; Monaghan, David S.; Hennelly, Bryan M.; McElhinney, Conor P.;...
A Projection System for Real World Three-Dimensional Objects Using Spatial Light Modulators
(2008)
Gopinathan, Unnikrishnan; Monaghan, David S.; Hennelly, Bryan M.; McElhinney, Conor P.; Kelly, Damien P.; McDonald, John; Naughton, Thomas J.; Sheridan, John T.
Abstract:
We discuss a projection system for real world threedimensional objects using spatial light modulators (SLM). An algorithm to encode the digital holograms of real world objects on to an SLM is presented. We present results from experiments to project holograms of real world holograms using a nematic liquid crystal SLM. We discuss the case when the pixel sizes of the charge-coupled device (CCD) and SLM used for recording the hologram and projection are different.
http://mural.maynoothuniversity.ie/5750/
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A Synergistic Approach for Recovering Occlusion-Free Textured 3D Maps of Urban Facades from Heterogeneous Cartographic Data
(2013)
Hammoudi, Karim; Dornaika, Fadi; Soheilian, Bahman; Vallet, Bruno; McDonald, John; Papa...
A Synergistic Approach for Recovering Occlusion-Free Textured 3D Maps of Urban Facades from Heterogeneous Cartographic Data
(2013)
Hammoudi, Karim; Dornaika, Fadi; Soheilian, Bahman; Vallet, Bruno; McDonald, John; Paparoditis, Nicolas
Abstract:
In this paper we present a practical approach for generating an occlusion-free textured 3D map of urban facades by the synergistic use of terrestrial images, 3D point clouds and area-based information. Particularly in dense urban environments, the high presence of urban objects in front of the facades causes significant difficulties for several stages in computational building modeling. Major challenges lie on the one hand in extracting complete 3D facade quadrilateral delimitations and on the other hand in generating occlusion-free facade textures. For these reasons, we describe a straightforward approach for completing and recovering facade geometry and textures by exploiting the data complementarity of terrestrial multi-source imagery and area-based information.
http://mural.maynoothuniversity.ie/8274/
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A system for teaching sign language using live gesture feedback
(2008)
Kelly, Daniel; McDonald, John; Markham, Charles
A system for teaching sign language using live gesture feedback
(2008)
Kelly, Daniel; McDonald, John; Markham, Charles
Abstract:
This paper presents a computer vision based virtual learning environment for teaching communicative hand gestures used in Sign Language. A virtual learning environment was developed to demonstrate signs to the user. The system then gives real time feedback to the user on their performance of the demonstrated sign. Gesture features are extracted from a standard web-cam video stream and shape and trajectory matching techniques are applied to these features to determine the feedback given to the user.
http://mural.maynoothuniversity.ie/8343/
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An Embedded Domain Specific Language for General Purpose Vectorization
(2017)
Karpiński, Przemysław; McDonald, John
An Embedded Domain Specific Language for General Purpose Vectorization
(2017)
Karpiński, Przemysław; McDonald, John
Abstract:
Portable SIMD code generation is an open problem in modern High Performance Computing systems. Performance portability can already be achieved, however it might fail when user-framework interaction is required. Of all portable vectorization techniques, explicit vectorization, using wrapper-class libraries, is proven to achieve the fastest performance, however it does not exploit optimization opportunities outside the simplest algebraic primitives. A more advanced language is therefore required, but the design of a new independent language is not feasible due to its high costs. This work describes an Embedded Domain Specific Language for solving generalized 1-D vectorization problems. The language is implemented using C++ as a host language and published as a lightweight library. By decoupling expression creation from evaluation a wider range of problems can be solved, without sacrificing runtime efficiency. In this paper we discuss design patterns necessary, but not limited, to e...
http://mural.maynoothuniversity.ie/12007/
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An examination of the influence of school mediated variables on academic achievement
(1992)
McDonald, John
An examination of the influence of school mediated variables on academic achievement
(1992)
McDonald, John
Abstract:
A study was conducted over three years to examine the influence of school mediated person and environmental variables on academic achievement outcome. The 250 subjects, male and female, were students in the final year of formal secondary education in three schools, who were preparing for their Irish Leaving Certificate examination, a formal nationwide multisubject assessment. The literature of cognitive and learning styles, academic achievement variables, and programmes to cater for individual differences is reviewed. The methodology and rationale for choice of variables is related to recent interactive student, teacher, environment studies. The variables general ability, dogmatism, need achievement, teacher preference, school alienation ,self esteem, attitude to education and curiosity were correlated with academic achievement as measured by performance in the public examinations. Results were controlled for collinearity. After general ability, the most significant correlating vari...
http://doras.dcu.ie/19019/
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An experiment in cross-age tutoring in an Irish post primary school
(1987)
McDonald, John
An experiment in cross-age tutoring in an Irish post primary school
(1987)
McDonald, John
Abstract:
A programme of cross-age tutoring was introduced into the formal curriculum of a second-level school. The aim was twofold - to increase the incidence of effective remedial help to those students experiencing difficulty in basic academic subjects, and to demonstrate the possibility of teachers devising, developing and implementing curriculum change relevant to the local needs of their individual schools. Secretarial students drawn from post-leaving certificate classes volunteered to tutor first and second year students identified as having academic difficulties mainly in the areas of mathematics and english. The study draws from a wide range of theoretical bases and stresses the importance of ecological validity both in programme development and in statistical analysis. The following programme outcomes were investigated: (1) academic gains of tutees, (2) attitudinal gains of tutees, (3) gains in self-esteem of tutors. Results indicate some academic gain, but highly significant attitu...
http://doras.dcu.ie/19020/
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Analysis of Sign Language Gestures Using Size Functions and Principal Component Analysis
(2008)
Kelly, Daniel; McDonald, John; Lysaght, Thomas; Markham, Charles
Analysis of Sign Language Gestures Using Size Functions and Principal Component Analysis
(2008)
Kelly, Daniel; McDonald, John; Lysaght, Thomas; Markham, Charles
Abstract:
This paper presents a computer vision based virtual learning environment for teaching communicative hand gestures used in Sign Language. A virtual learning environment was developed to demonstrate signs to the user. The system then gives real time feedback to the user on their performance of the demonstrated sign. Gesture features are extracted from a standard web-cam video stream and shape and trajectory matching techniques are applied to these features to determine the feedback given to the user.
http://mural.maynoothuniversity.ie/8342/
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Automatic estimation of the dynamics of facial expression using a three-level model of intensity
(2008)
Delannoy, Jane Reilly; McDonald, John
Automatic estimation of the dynamics of facial expression using a three-level model of intensity
(2008)
Delannoy, Jane Reilly; McDonald, John
Abstract:
Facial expressions and their associated dynamics play an important role in human communication. The dynamics of facial expressions can be defined as the intensity and timing of their constituent components as they form. However, estimating the dynamics of facial expressions is a non trivial task. The majority of automatic approaches to characterising intensity use a two-level model (also known as onset-apex-offset). However the FACS specifies five intensity levels for each AU. In this paper we evaluate the efficacy of Local Linear Embedding as a means of estimating the intensity of facial expression. This is done using both the full five level FACS model, and a simplified three level model. We have found that using the FACS intensity scoring results in a considerable overlap between the estimated intensities. Using a three level model enables us to classify the intensities with significantly greater degree of accuracy.
http://mural.maynoothuniversity.ie/8341/
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Automatic Recognition of Head Movement Gestures in Sign Language Sentences
(2009)
Kelly, Daniel; Reilly Delannoy, Jane; McDonald, John; Markham, Charles
Automatic Recognition of Head Movement Gestures in Sign Language Sentences
(2009)
Kelly, Daniel; Reilly Delannoy, Jane; McDonald, John; Markham, Charles
Abstract:
A novel system for the recognition of head movement gestures used to convey non-manual information in sign language is presented. We propose a framework for recognizing a set of head movement gestures and identifying head movements outside of this set. Experiments show our proposed system is capable of classifying three different head movement gestures and identifying 15 other head movements as movements which are outside of the training set. In this paper we perform experiments to investigate the best feature vectors for discriminating between positive a negative head movement gestures and a ROC analysis of the systems classifications performance showed an area under the curve measurement of 0:936 for the best performing feature vector.
http://mural.maynoothuniversity.ie/2548/
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Classification of Human Poses using a Vision based Technique
(2007)
Kelly, Dan; Olivo, Paolo; Markham, Charles; McDonald, John; Caulfield, Brian; Fitzgeral...
Classification of Human Poses using a Vision based Technique
(2007)
Kelly, Dan; Olivo, Paolo; Markham, Charles; McDonald, John; Caulfield, Brian; Fitzgerald, Diarmuid
Abstract:
This paper presents work being carried out to estimate human pose using vision based methods. The data acquisition system uses an active marker technique synchronized with a three camera stereo vision system. The locations of the markers are then used to reconstruct a skeleton representation of the human pose. PCA and clustering techniques are used to classify the pose.
http://mural.maynoothuniversity.ie/8348/
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Collaborative Dense SLAM
(2018)
Gallagher, Louis; McDonald, John
Collaborative Dense SLAM
(2018)
Gallagher, Louis; McDonald, John
Abstract:
In this paper, we present a new system for live collaborative dense surface reconstruction. Cooperative robotics, multi participant augmented reality and human-robot interaction are all examples of situations where collaborative mapping can be leveraged for greater agent autonomy. Our system builds on ElasticFusion to allow a number of cameras starting with unknown initial relative positions to maintain local maps utilising the original algorithm. Carrying out visual place recognition across these local maps the system can identify when two maps overlap in space, providing an inter-map constraint from which the system can derive the relative poses of the two maps. Using these resulting pose constraints, our system performs map merging, allowing multiple cameras to fuse their measurements into a single shared reconstruction. The advantage of this approach is that it avoids replication of structures subsequent to loop closures, where multiple cameras traverse the same regions of the e...
http://mural.maynoothuniversity.ie/13358/
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Continuous Humanoid Locomotion over Uneven Terrain using Stereo Fusion
(2015)
Marion, Pat; Fallon, Maurice; Deits, Robin; Whelan, Thomas; Antone, Matthew; McDonald, ...
Continuous Humanoid Locomotion over Uneven Terrain using Stereo Fusion
(2015)
Marion, Pat; Fallon, Maurice; Deits, Robin; Whelan, Thomas; Antone, Matthew; McDonald, John; Tedrake, Russ
Abstract:
Humanoid robots have the potential to traverse the same com- plex terrain as humans: dealing with all the challenges of uneven and discontinuous surfaces, cracks and gaps while moving at typical human speeds. While locomotion research spans actuator development, dynamic planning and control, in this work we focus on terrain estimation and footstep plan- ning — in particular while in continuous motion. We demonstrate that a precisely accurate dense terrain map can be estimated using only imagery from a humanoid robot’s passive stereo camera . This result then provides the necessary sensory input for an on-demand footstep planner which can in turn compute a set of footsteps which are optimal (within our assumptions) and kinematically feasible; yet does so suffi- ciently quickly that the robot can continuously locomote over uneven terrain. Our experiments demonstrate the Boston Dynamics Atlas robot continuously walking over a terrain course similar to t...
http://mural.maynoothuniversity.ie/8308/
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Continuous recognition of motion based gestures in sign language
(2009)
Kelly, Daniel; McDonald, John; Markham, Charles
Continuous recognition of motion based gestures in sign language
(2009)
Kelly, Daniel; McDonald, John; Markham, Charles
Abstract:
We present a novel and robust system for recognizing two handed motion based gestures performed within continuous sequences of sign language. While recognition of valid sign sequences is an important task in the overall goal of machine recognition of sign language, detection of movement epenthesis is important in the task of continuous recognition of natural sign language. We propose a framework for recognizing valid sign segments and identifying movement epenthesis. Our system utilizes a single HMM threshold model, per hand, to detect movement epenthesis. Further to this, we develop a novel technique to utilize the threshold model and dedicated gesture HMMs to recognize gestures within continuous sign language sentences. Experiments show that our system has a gesture detection ratio of 0.956 and a reliability measure of 0.932 when spotting 8 different signs from 240 video clips.
http://mural.maynoothuniversity.ie/8340/
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Deformation-based Loop Closure for Large Scale Dense RGB-D SLAM
(2013)
Whelan, Thomas; Kaess, Michael; Leonard, John J.; McDonald, John
Deformation-based Loop Closure for Large Scale Dense RGB-D SLAM
(2013)
Whelan, Thomas; Kaess, Michael; Leonard, John J.; McDonald, John
Abstract:
In this paper we present a system for capturing large scale dense maps in an online setting with a low cost RGB-D sensor. Central to this work is the use of an “as-rigid-aspossible” space deformation for efficient dense map correction in a pose graph optimisation framework. By combining pose graph optimisation with non-rigid deformation of a dense map we are able to obtain highly accurate dense maps over large scale trajectories that are both locally and globally consistent. With low latency in mind we derive an incremental method for deformation graph construction, allowing multi-million point maps to be captured over hundreds of metres in real-time. We provide benchmark results on a well established RGBD SLAM dataset demonstrating the accuracy of the system and also provide a number of our own datasets which cover a wide range of environments, both indoors, outdoors and across multiple floors.
http://mural.maynoothuniversity.ie/6496/
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Depth-independent segmentation of macroscopic three-dimensional objects encoded in single perspectives of digital holograms
(2007)
McElhinney, Conor P.; McDonald, John; Castro, Albertina; Frauel, Yann; Javidi, Bahram; ...
Depth-independent segmentation of macroscopic three-dimensional objects encoded in single perspectives of digital holograms
(2007)
McElhinney, Conor P.; McDonald, John; Castro, Albertina; Frauel, Yann; Javidi, Bahram; Naughton, Thomas J.
Abstract:
We present a technique for performing segmentation of macroscopic three-dimensional objects recorded using in-line digital holography. We numerically reconstruct a single perspective of each object at a range of depths. At each point in the digital wavefront we calculate variance about a neighborhood. The maximum variance at each point over all depths is thresholded to classify it as an object pixel or a background pixel. Segmentation results for objects of low and high contrast are presented.
http://mural.maynoothuniversity.ie/8281/
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Design, Implementation and Simulation of an Experimental Multi-Camera Imaging System for Terrestrial and Multi-Purpose Mobile Mapping Platforms: A Case Study
(2013)
Hammoudi, Karim; McDonald, John
Design, Implementation and Simulation of an Experimental Multi-Camera Imaging System for Terrestrial and Multi-Purpose Mobile Mapping Platforms: A Case Study
(2013)
Hammoudi, Karim; McDonald, John
Abstract:
Mobile Mapping Systems (MMS’s) are powerful tools for rapidly and massively collect- ing imagery in various environments (e.g., rural, semi-urban, urban). In particular, the data collected at terrestrial level can be exploited to complement aerial acquisitions for extending GIS databases, visualizing and modeling environments and studying their morphogenesis over time. Hence, the de- velopment of mobile mapping platforms is a topic of great interest for many mapping agencies and surveying companies. Moreover, the experimental imaging systems of mapping vehicles are equipped with varied infrastructures in part resulting from the wide range of targeted applications. Determining a detailed design procedure for such imaging systems is of critical importance, and can be both ardu- ous and time-consuming. Although commercial imaging systems can be exploited directly they are often pre-configured for specific applications. For these reasons, we propose a case study that deals with the deve...
http://mural.maynoothuniversity.ie/8275/
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Development of a wearable motion capture suit and virtual reality biofeedback system for the instruction and analysis of sports rehabilitation exercises
(2007)
Fitzgerald, Diarmaid; Foody, John; Kelly, Dan; Ward, Tomas E.; Markham, Charles; McDona...
Development of a wearable motion capture suit and virtual reality biofeedback system for the instruction and analysis of sports rehabilitation exercises
(2007)
Fitzgerald, Diarmaid; Foody, John; Kelly, Dan; Ward, Tomas E.; Markham, Charles; McDonald, John; Caulfield, Brian
Abstract:
This paper describes the design and development of a computer game for instructing an athlete through a series of prescribed rehabilitation exercises. In an attempt to prevent or treat musculoskeletal type injuries along with trying to improve physical performance, athletes are prescribed exercise programmes by appropriately trained specialists. Typically athletes are shown how to perform each exercise in the clinic following examination but they often have no way of knowing if their technique is correct while they are performing their home exercise programme. We describe a system that allows an automatic audit of this activity. Our system utilises ten inertial motion tracking sensors incorporated in a wearable body suit which allows a bluetooth connection from a root hub to a laptop/computer. Using our specifically designed software programme, the athlete can be instructed and analysed as he/she performs the individually tailored exercise programme and a log is recorded of the time...
http://mural.maynoothuniversity.ie/1302/
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Digital Holographic Superresolution by Rotating the Object Wavefield
(2007)
Hennelly, Bryan M.; Naughton, Thomas J.; McDonald, John
Digital Holographic Superresolution by Rotating the Object Wavefield
(2007)
Hennelly, Bryan M.; Naughton, Thomas J.; McDonald, John
Abstract:
We create superresolved digital holograms by stitching together multiple holograms of 3-D objects. The object wavefield is rotated between captures and stitched together using digital signal processing techniques. The numerical aperture is increased significantly.
http://mural.maynoothuniversity.ie/8344/
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