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35th Annual conference on computer graphics and Visual Computing, CGVC 2017

作者： Turner, M.J. Morris, T. Sandoval, M. School of Computer Science University of Manchester ManchesterM13 9PL United Kingdom Research IT University of Manchester ManchesterM13 9PL United Kingdom

ISBN: (纸本)9783038680505

This short extended abstract investigates human-computer interactions in relation to a specific Six Degree of Freedom (6DoF) input device;described is the driver development and calibration required for a novel piece of hardware;and after initial user tests and a questionnaire of satisfaction, we consider areas for further research. This abstract concludes with a discussion of the design and use of dual-6DoF input devices and from feedback how new interaction modes will be exploited. © 2017 The Author(s) Eurographics Proceedings © 2017 The Eurographics Association.

关键词： Human computer interaction

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Foundations of Map-based Web Applications A Survey of the Use, Limits and Opportunities Offered by Digital Maps 12

Foundations of Map-based Web Applications <i>A Survey of the...

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12th International Joint conference on computer Vision, imaging and computer graphics Theory and Applications (VISIGRAPP)

作者： Antonini, Alessio Boella, Guido Buccoliero, Stefania Lupi, Lucia Schifanella, Claudio Univ Turin Dept Comp Sci Corso Svizzera 185 Turin Italy Politecn Torino Interuniv Dept Reg & Urban Studies & Planning Turin Italy Univ Turin Turin Italy

ISBN: (纸本)9789897582295

Traditional maps are one of the oldest way to express relevant information on a locality base, as synthetic representations of reality. The traditional visualization theory of maps and the related principles used to structure spatial information can inspire the modelling of new solutions in the field of information management in web application. But, the fast and generalized spreading of digital maps, and the related production of geo-localized social media is not followed by a deep integration of map in web applications, preventing the effectiveness of digital maps in solving pressing issues like aggregation, retrieval, recommendation and presentation of spatial media. Through the analysis of key concepts of maps, this contribution addresses the foundations of map-based applications, discussing the limits of current approaches and introducing new opportunities based on deep integration between maps and applications.

关键词： Urban Informatics Digital Maps Web Applications Data visualisation Urban Entities Urban Computing

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GPU accelerated regional lung air volume measurements from phase contrast X-ray images

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JOURNAL OF REAL-TIME IMAGE PROCESSING 2016年第1期12卷 43-54页

作者： Islam, M. Sirajul Kitchen, Marcus J. Monash Univ Sch Phys Clayton Vic 3800 Australia

Phase contrast X-ray imaging can provide significantly enhanced visibility of soft tissues over absorption contrast imaging with spatial resolution on the micron scale. These characteristics have enabled the visualisation of lungs aerating at birth in real time. We have developed techniques to measure regional lung air volume from these images to help develop methods for safely ventilating the lungs of preterm infants. However, analyzing a large sequence of image data requires considerable computation time on traditional desktop computers. Real-time feedback of the regional ventilation would greatly benefit researches to optimize ventilation strategies. The present paper describes methods for improving the execution time of the lung volume measurements using graphics processing units (GPUs). We tested the performance of the GPU-accelerated lung volume computations using two different GPUs and compared the results with two CPUs. An overall speedup of 1.75-14.12x was achieved if an absorption contrast-based computation was used for volumetric computation, while a 2.43-15.78x speedup was attained in the case of a more compute bound phase retrieval technique. This speedup enabled us to perform lung air volume reconstruction on a local computer with the analysis taking only a few minutes, which is very helpful to guide our experiments in the laboratory. We also show that the accuracy of the GPU-based lung volume measurements was in excellent agreement with the CPU-based counterpart.

关键词： graphics processing unit Phase contrast X-ray imaging Parallel processing

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Exploring face recognition under complex lighting conditions with hdr imaging 34

Exploring face recognition under complex lighting conditions...

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34th Annual conference on computer graphics and Visual Computing, CGVC 2016

作者： Ige, E.O. Debattista, K. Mukherjee, R. Chalmers, A. Visualisation Group WMG University of Warwick Coventry United Kingdom

ISBN: (纸本)9783038680222

Applying image processing applications under complex or harsh lighting conditions can be a difficult challenge. In particular, face recognition can be prone to such limitations due to the uncontrolled nature of the applications to which it is applied. One of the conventional ways used to resolve this concern is by capturing images under controlled light or pre-processing the affected images, which can change the perception of the resultant images. One of the primary issues with this is the lack of information present in the original images due to over-exposed and under-exposed pixels. High Dynamic Range (HDR) imaging offers an alternative due to its capability of handling natural lighting. This paper explores the use HDR imaging for face recognition. A training and testing set of HDR images under different harsh lighting conditions was created. Traditional low dynamic range methods were compared with using the full range and applying HDR methods to a traditional face recognition method. Results demonstrate that adapting HDR captured images for use with traditional face recognition methods via a tone mapping provides sufficient improvement and enables traditional algorithms to cope well with harsh lighting scenarios. © 2016 The Eurographics Association.

关键词： Face recognition

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A gesture control framework targeting high-resolution video wall displays 19

A gesture control framework targeting high-resolution video ...

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19th International conference on Information visualisation, IV 2015

作者： Klein, Bernhard Future Cities Laboratory Singapore-ETH Centre 1 Create Way Singapore138602 Singapore

ISBN: (纸本)9781467375689

This recent advances in display and user interface technologies create new opportunities for participatory urban planning. Whereas touch screens enable direct screen interactions for intuitive remodeling of urban simulations, high resolution video walls offer true-to-life or human-scale scenario visualizations. Multi-touch screen environments finally function as an interactive user interface for the entire urban simulation pipeline. However intuitive and preferably natural interactions for simple reconfiguration, overarching tool management or complex tool interaction remain a major challenge. For this reason we have implemented a gesture recognition framework that uses multimodal input devices to satisfy all gesture use cases and integrates a display management system for seamless interaction with our multi-screen infrastructure. To understand the implications of this novel approach, we conducted preliminary user trials with urban planning experts and technicians. The results indicated that the system provides a fluid and natural user experience for exploring and analyzing urban planning data. © 2015 IEEE.

关键词： Human computer interaction

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Enhancing Visual Perception and Directing Viewer's Attention in Interactive Direct Volume Rendering

Enhancing Visual Perception and Directing Viewer's Attention...

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International conference on Information visualisation (IV)

作者： Amirali Sharifi Pierre Boulanger University of Alberta

Interactive visualization of medical data plays an increasingly vital role in clinical diagnosis. Cluttered views, lack of visual cues, etc. Are some of the problems that exist specially when projecting a 3D rendering of a Computed Tomography data on a 2D screen. In this paper we proposed two synthetic visual cues. They facilitate perception by removing visual clutter while maintaining context, directing viewers' attention to the object of interest, and consequently enhancing clinical diagnosis. Our proposed cues can be used both individually or combined with any other existing cues. Although our methods have been created with medical visualization in mind, it is possible to use them in other volume rendering applications as well.

关键词： Image color analysis Rendering (computer graphics) Visualization Biomedical imaging Arteries Visual perception Computed tomography

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Comparison between OpenGL ES and metal API in medical volume visualisation

Comparison between OpenGL ES and metal API in medical volume...

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IEEE International conference on Intelligent Computing and Information Systems (ICICIS)

作者： Yassmin Abdallah Abdelaziz Abdelhamid Taha Elarif Abdel-Badeeh M. Salem Faculty of Computer and Information Sciences Ain Shams University Cairo Egypt

A decade ago volume visualization required costly workstations due to the high processing cost for visualization. Nowadays and with the rapid development of mobile graphics, opportunities to provide volume visualization on mobile devices have been increased. New graphic application programming interfaces (APIs) have been developed as worthy candidates to support the volume rendering core. This paper focused especially on OpenGL ES and Metal APIs. OpenGL ES is a cross-platform API designed especially for embedded systems; such as smartphones, computer tablets, video game consoles and personal digital assistants (PDAs). Metal is a low-level, low-overhead hardware- accelerated graphics and compute API that debuted in iOS 8. It combines functionality similar to OpenGL and OpenCL under one API. This paper shed a light on the performance gained by Metal over OpenGL ES by implemented two applications for texture mapping; each of them uses different API and compare the rendering time. Four dataset used to test the result, namely: Diaphysis, Distal epiphysis, Scapula and knee. The first three datasets used from the laboratory of human anatomy and embryology, University of Brussels (ULB), Belgium, the last one used from Osirix DICOM sample.

关键词： Computed tomography Biomedical imaging Rendering (computer graphics) Servers Three-dimensional displays RNA Metals

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Offline Large Scale Fourier Volume Rendering on Low-end Hardware 7

Offline Large Scale Fourier Volume Rendering on Low-end Hard...

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7th Cairo International Biomedical Engineering conference CIBEC 2014 Contents

作者： Abdellah, Marwan Eldeib, Ayman Sharawi, Amr Cairo Univ Syst & Biomed Engn Dept Giza Egypt

ISBN: (纸本)9781479944125

The resolution of medical data sets acquired by state-of-the-art imaging modalities is growing rapidly. Providing high-end workstations to visualize such data sets might not be affordable in some cases. To resolve this issue, there should be alternative convenient software solutions to handle huge data sets either by out-of-core or offline rendering applications. This presented work features an offline rendering pipeline that is capable of rendering digital x-ray radiographs of very large scale volumetric data sets, which cannot fit into the memory of the running platform relying on spatial-domain decomposition and projection-slice theorem.

关键词： Fourier transforms biomedical equipment data visualisation diagnostic radiography image resolution medical image processing pipeline processing rendering (computer graphics) data set visualization digital X-ray radiograph rendering high-end workstation large scale volumetric data set low-end hardware medical data set acquisition medical data set resolution offline large scale Fourier volume rendering offline rendering application offline rendering pipeline work feature out-of-core rendering application projection-slice theorem running platform memory software solution spatial-domain decomposition state-of-the-art imaging modality Back Software Transforms software solution diagnostic radiography Medical device Data visualisation Pipeline processing Medical image processing image resolution Fourier Transform Transform Dataset Back Rendering (computer graphics) computer software Rendering OFF LINE

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International conference on computer Vision and graphics, ICCVG 2014

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International conference on computer Vision and graphics, ICCVG 2014

ISBN: (纸本)9783319113302

The proceedings contain 81 papers. The special focus in this conference is on computer Vision and graphics. The topics include: A validation of combined metrics for color image quality assessment;quartic orders and sharpness in trajectory estimation for smooth cumulative chord cubics;parallel simulation of atmospheric halo phenomena;mandelbrot- and julia-like rendering of polynomiographs;time compensation in perceptual experiments;fur visualisation for computer game engines and real-time rendering;multiple scattering in cumulus clouds;component weight tuning of SSIM image quality assessment measure;ground truth and performance evaluation of lane border detection;gaze-driven object tracking based on optical flow estimation;compression of synthetic-aperture radar images;feynman-kac formula and restoration of high ISO images;fusion of visual and range images for object extraction;noise reduction in thermal images;advantages of using object-specific knowledge at an early processing stage in the detection of trees in LIDAR data;a modular workflow architecture for coronary centerline extraction in computed tomography angiography data;simulated holography based on stereoscopy and face tracking;automatic assessment of skull circumference in craniosynostosis;performance evaluation of binary descriptors of local features;adaptive and quality-aware storage of JPEG files in the web environment;egomotion estimation by point-cloud back-mapping;multiple instances detection in RGBD images;automated traffic analysis in aerial images;unsupervised detector adaptation by joint dataset feature learning;true zoom with cylindrical light feld system;computer simulation of the swi protocol in nuclear magnetic resonance imaging.

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3D Photorealistic Scientific Visualization of Tsunami Waves and Sea Level Rise

3D Photorealistic Scientific Visualization of Tsunami Waves ...

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IEEE International conference on imaging Systems and Techniques (IST) / IEEE International School on imaging

作者： Giannakidis, Alexandros Giakoumidakis, Giannis Mania, Katerina Cultureplay Inc Athens Greece Tech Univ Crete Chania Dept Elect & Comp Engn Iraklion Greece

ISBN: (纸本)9781479952205

A methodology is proposed for the photorealistic scientific visualization of a tsunami wave. The methodology is applied to the case of the tsunami occurring after the Mediterranean earthquake in 365 AD, provoking sea level rise in Heraklion port in Crete, Greece. The work presented in this paper puts forward a semi-automated workflow for parsing modeled data embedded in animation software of choice. By scripting the manual work needed for the import and processing of geo-referenced time arrays, a 4 minutes animation showcasing the automated workflow was created. The script implemented directs the automatic loading of geotif data and produces the required shapekeys needed for the final 3d animation. It minimized production costs for the sea level animation to a minimum and aided the quick visualization of large arrays of numerical models in geo-referenced 3D representing the impact zone. The 3D & animation data can then be handed out to the post processing team focusing on special effects and photorealistic rendering, maintaining scientific accuracy in the final animation.

关键词： computer animation data visualisation earthquakes geophysics computing rendering (computer graphics) tsunami 3D animation data 3D photorealistic scientific visualization Crete Greece Heraklion port Mediterranean earthquake animation software automatic geotif data loading georeferenced 3D georeferenced time arrays numerical models photorealistic rendering post processing team scientific accuracy sea level animation sea level rise semiautomated workflow shapekeys time 4 min tsunami waves Animation Data visualization Sea level Shape Spatial databases Three-dimensional displays Tsunami

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