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Boundary filtering approach in surface reconstruction

Boundary filtering approach in surface reconstruction

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作者： Varnuška, Michal Kolingerovaá, Ivana Centre of Computer Graphics and Data Visualisation University of West Bohemia Pilsen Czech Republic

One of the methods for 3D data model acquisition is real object digitisation followed by surface reconstruction. Many algorithms have been developed to do this, each with its advantages and disadvantages. We use for the reconstruction a CRUST algorithm by Nina Amenta, which selects surface triangles from the Delaunay tetrabedronisation using information from the dual Voronoi diagram. Unfortunately, these candidate surface triangles do not form a manifold, so it is necessary to perform some other steps for manifold extraction. In this paper, we present some observations and modifications for this step, which improve the quality of the resulting mesh especially in the case, when the surface contains boundaries. Copyright © 2007 Inderscience Enterprises Ltd.

关键词： Surface reconstruction

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Opacity volume based halo generation for enhancing depth perception

Opacity volume based halo generation for enhancing depth per...

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12th International Conference on computer-Aided Design and computer graphics, CAD/graphics 2011

作者： Tao, Yubo Lin, Hai Dong, Feng Clapworthy, Gordon State Key Lab. of CAD and CG Zhejiang University China Centre for Computer Graphics and Visualisation University of Bedfordshire United Kingdom

ISBN: (纸本)9780769544977

Halos are usually used to enhance depth perception and display spatial relationships in illustrative visualization. In this paper, we present a simple and effective method to create volumetric halo illustration. In the pre-processing stage, we generate a view-independent halo intensity volume, which contains all potential halos around the boundaries of features, based on the opacity volume on graphic hardware. During halo rendering, the halo intensity volume is used to extract halos only around the contours of structures for the current viewpoint. The performance of our approach is significantly faster than previous halo illustration methods, which perform both halo generation and rendering during volume rendering. Experimental results demonstrate volumetric halo effects and the efficiency of the proposed approach. © 2011 IEEE.

关键词： Volume rendering

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Web-Based 3D visualisation for Biomedical Applications

Web-Based 3D Visualisation for Biomedical Applications

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International Conference on Information visualisation (IV)

作者： Hui Wei Enjie Liu Xia Zhao N.J.B. McFarlane G.J. Clapworthy Centre of Computer Graphics & Visualisation University of Bedfordshire UK

This paper proposes an easy way to perform web-based 3D interactive visualisation, which accepts two data resources, local and remote, as input and copes with two types of algorithm, built-in and remote. The focus of this paper is the biomedical area. Today's web technology makes it possible to use software maintained on a remote server. The approach described provides a virtual client environment, in which users can employ remotely installed software interactively using any standard browser. The proposed approach is a generic one and can be used in many other application areas.

关键词： Data visualization Servers Libraries Java Three dimensional displays Web services Browsers

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Experts vs. novices: Applying eye-tracking methodologies in colonoscopy video screening for polyp search 14

Experts vs. novices: Applying eye-tracking methodologies in ...

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8th Symposium on Eye Tracking Research and Applications, ETRA 2014

作者： Bernal, Jorge Sánchez, F. Javier Vilariño, Fernando Arnold, Mirko Ghosh, Anarta Lacey, Gerard Centre de Visio per Computador Universitat Autonoma de Barcelona Spain Graphics Vision and Visualisation Group School of Computer Science and Statistics Trinity College Dubline Ireland

ISBN: (纸本)9781450327510

We present in this paper a novel study aiming at identifying the differences in visual search patterns between physicians of diverse levels of expertise during the screening of colonoscopy videos. Physicians were clustered into two groups -experts and novices- according to the number of procedures performed, and fixations were captured by an eye-tracker device during the task of polyp search in different video sequences. These fixations were integrated into heat maps, one for each cluster. The obtained maps were validated over a ground truth consisting of a mask of the polyp, and the comparison between experts and novices was performed by using metrics such as reaction time, dwelling time and energy concentration ratio. Experimental results show a statistically significant difference between experts and novices, and the obtained maps show to be a useful tool for the characterisation of the behaviour of each group.

关键词： Eye tracking

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Laplacian musculoskeletal deformation for patient-specific simulation and visualisation

Laplacian musculoskeletal deformation for patient-specific s...

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2013 17th International Conference on Information visualisation, IV 2013

作者： Zhao, Youbing Clapworthy, Gordon J. Kohout, Josef Dong, Feng Tao, Yubo Wei, Hui McFarlane, Nigel Centre for Computer Graphics and Visualisation University of Bedfordshire United Kingdom Department of Computer Science and Engineering University of West Bohemia Plzeò Czech Republic State Key Lab. of CAD and CG Zhejiang University Hangzhou China

ISBN: (纸本)9780769550497

In many biomedical applications, it is often desired to simulate, analyse and visualise the dynamics of a particular patient based on a patient-specific musculoskeletal model. However, reconstructing a patient-specific model directly from medical images is highly labour intensive, and impractical in the clinical context. A more efficient method is to derive it from an atlas musculoskeletal model using patient-specific hints. In this paper, Laplacian mesh processing is introduced to deform an atlas model to a patient-specific model, based on patient-specific landmarks extracted from two orthogonal clinical images and using least-squares error optimization. Muscle attachment landmarks and motion landmarks in the atlas are also transformed as part of the process. Drift and inter-surface penetrations are prevented by supplementary inter-surface landmarks. Mesh simplification and reconstruction are used to avoid out-of-memory failures that may result from trying to deform models at high resolution. © 2013 IEEE.

关键词： Deformation

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Accelerating Tumour Growth Simulations on Many-Core Architectures: A Case Study on the Use of GPGPU within VPH

Accelerating Tumour Growth Simulations on Many-Core Architec...

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International Conference on Information visualisation (IV)

作者： Baoquan Liu Gordon J. Clapworthy Feng Dong Eleni Kolokotroni Georgios Stamatakos Centre of Computer Graphics & Visualisation University of Bedfordshire UK Institute of Communication and Computer Systems National and Technical University of Athens Athens Greece

Simulators of tumour growth can estimate the evolution of tumour volume and the quantity of various categories of cells as functions of time. However, the execution time of each simulation often takes several dozens of minutes (depending upon the dataset resolution), which clearly prevents easy interaction. The modern graphics processing unit (GPU) is not only a powerful graphics engine but also a highly parallel programmable processor featuring peak arithmetic performance and memory bandwidth that substantially outpaces its CPU counterpart. However, despite this, the GPU is little used in the context of the Virtual Physiological Human (VPH). This paper provides a case study to demonstrate the performance advantages that can be gained by using the GPU appropriately in the context of a VPH project in which the study of tumour growth is a central activity. We also analyse the algorithm performance on different modern parallel processing architectures, including multicore CPU and many-core GPU.

关键词： graphics processing unit Tumors Instruction sets Biological system modeling Computational modeling Adaptation models computer architecture

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CCVis: A Software Plugin for Unified visualisation in ContraCancrum Based on VTK Extensions

CCVis: A Software Plugin for Unified Visualisation in Contra...

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International Conference on Information visualisation (IV)

作者： Youbing Zhao Gordon J. Clapworthy Yubo Tao Feng Dong Hui Wei Tao Wang Centre of Computer Graphics & Visualisation University of Bedfordshire UK State Key Laboratory of CAD&CG University of Zhejiang China

Medical visualisation is an indispensable means for doctors and researchers to better explore and analyse medical images. The EC-funded ContraCancrum project, which aims at more predictable tumour simulation and treatment, uses visualisation as an important tool to interactively display tumour development and tumour simulation. This paper presents CCVis - the visualisation tool in ContraCancrum - which is a Qt-based plug in of the DrEye platform. CCVis uses a unified architecture for visualisation of the patient image data and tumour simulation data. It provides axis-aligned and arbitrary slice views, is surface rendering and volume ray casting as well as time-varying visualisation of patient image series and simulation data. Statistics in tumour simulation are plotted as 2D graphs. Major extensions of the Visualization Toolkit (VTK) are made to meet the demands for label highlighting and multi-dimensional transfer function.

关键词： Tumors Rendering (computer graphics) Transfer functions Data models Isosurfaces DICOM

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Opacity Volume Based Halo Generation for Enhancing Depth Perception

Opacity Volume Based Halo Generation for Enhancing Depth Per...

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IEEE International Conference on computer-Aided Design and computer graphics

作者： Yubo Tao Hai Lin Feng Dong Gordon Clapworthy Centre for Computer Graphics & Visualisation University of Bedfordshire UK State Key Laboratory of CAD&CG Zhejiang University China

关键词： Rendering (computer graphics) Transfer functions Three dimensional displays Feature extraction Hardware Image color analysis

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Improving the Validity of Lifelogging Physical Activity Measures in an Internet of Things Environment

Improving the Validity of Lifelogging Physical Activity Meas...

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IEEE International Conference on Ubiquitous Computing and Communications

作者： Po Yang Martin Hanneghan Jun Qi Zhikun Deng Feng Dong Dina Fan School of Computing and Mathematical Sciences Liverpool John Moores University Liverpool UK Centre of Computer Graphics and Visualisation Bedfordshire University Luton UK

ISBN: (纸本)9781509001552

Recently, the popular use of wearable devices and mobile apps makes the effectively capture of lifelogging physical activity data in an Internet of Things (IoT) environment possible. The effective collection of measures of physical activity in the long term is beneficial to interdisciplinary healthcare research and collaboration from clinicians, researchers to patients. However, due to heterogeneity of connected devices and rapid change of diverse life patterns in an IoT environment, lifelogging physical activity information captured by mobile devices usually contains much uncertainty. In this paper, we provide a comprehensive review of existing life-logging physical activity measurement devices, and identify regular and irregular uncertainties of these activity measures in an IoT environment. We then project the distribution of irregular uncertainty by defining a walking speed related score named as Daily Activity in Physical Space (DAPS). Finally, we present an ellipse fitting model based validity improvement method for reducing uncertainties of life-logging physical activity measures in an IoT environment. The experimental results reflect that the proposed method effectively improves the validity of physical activity measures in a healthcare platform.

关键词： physical activity life-logging internet of things

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visualisation of Left Ventricular Dysfunction in the Virtual Pathological Heart

Visualisation of Left Ventricular Dysfunction in the Virtual...

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International Conference on Information visualisation (IV)

作者： X. Lin N. J. B. McFarlane Y. Zhao G. J. Clapworthy F. Dong A. Redaelli Centre for Computer Graphics & Visualisation University of Bedfordshire UK University of Bedfordshire Luton Luton GB Department of Bioengineering Politecnico di Milano Italy

While there has been significant progress in the treatment of ischemic heart failure, it remains a significant health and economic problem worldwide. In this paper, we present the challenges of modelling ischemic heart failure and introduce a user-friendly software system that will be a sub-set of the Virtual Pathological Heart environment which is currently being developed under the FP7 VPH2 project. This will provide patient-specific computational modelling and simulation of the human heart to assist the cardiologist and the cardiac surgeon in defining the severity and extent of disease in patients with post-ischemic Left Ventricular Dysfunction. The proposed system will provide visualisation tools for surgical assessment and planning: the registration and display of necrotic and hypo-kinetic regions; simulated surgical restoration (cutting and patching); and finally post-operative functional prediction (volume, shape and mitral valve regurgitation).

关键词： Heart Surface reconstruction Surgery Three dimensional displays Magnetic resonance imaging Hafnium Surface topography

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