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2013 11th International Conference on High Performance Computing and Simulation, HPCS 2013

作者： Codreanu, Valeriu Dong, Feng Liu, Baoquan Roerdink, Jos B.T.M. Williams, David Yang, Po Yasar, Burhan Scientific Visualization and Computer Graphics Rijksuniversiteit Groningen Groningen Netherlands Department of Computer Science and Technology University of Bedfordshire Bedfordshire United Kingdom Rotasoft Inc United Kingdom

ISBN: (纸本)9781479908363

This paper presents a method that takes advantage of powerful graphics hardware to obtain fully affine-invariant image feature detection and matching. The chosen approach is the accurate, but also very computationally expensive, ASIFT algorithm. We have created a CUDA version of this algorithm that is up to 70 times faster than the original implementation, while keeping the algorithm's accuracy close to that of ASIFT. It's matching performance is therefore much better than that of other non-fully affine-invariant algorithms. Also, this approach was adapted to fit the multi-GPU paradigm in order to assess the acceleration potential from modern GPU clusters. © 2013 IEEE.

关键词： computer vision

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A method for identifying image data coming from two optical channels in a split field of view star camera

A method for identifying image data coming from two optical ...

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IEEE Metrology for Aerospace

作者： Dong Cao Ze Chen Xiaofeng Wang Shaobo Gao Jichun Tan Yunjin Chen Department of Optoelectronic Engineering Jinan University JNU Changsha P. R. China College of Science National University of Defense Technology NUDT Changsha P. R. China Institute of Computer Graphics and Vision Graz University of Technology TU Graz Graz Austria

Split FOV (Field of View) star tracker was developed by Texas A&M University together with the University of Rome “La Sapienza”. A 50% splitter was used to combine light beams from two separate FOVs, while only a single objective lens and optical detector are used. In this way, double FOV configuration allows increased accuracy in attitude determination by taking advantage of the ability to examine two orthogonal FOVs simultaneously. There is a demand for optical tag due to each frame contained overlapping star images coming from separate FOVs. In this paper we propose a method for identifying two FOVs by tagging the images with different shaped diffraction patterns. We insert a circular diaphragm in the optical channel 1 # and non-circular (elliptical or rectangular) in the channel 2 # , so that images with distinctive features are produced at CCD photosensitive surface - circular Airy disc for the FOV-1 # and elliptical contour (with side lobe or distortion) for FOV-2 # . The effects of elliptical sampling window and the signal-to-noise ratio on the accuracy of the centroid estimate for star spots with a Gaussian intensity distribution were discussed theoretically. The optical tagging has one limitation. There is possibility for a star image tagged by non-circular contour, which is confused with smearing trail due to high angular velocity operation (e.g. greater than 1°/s).

关键词： Apertures Optical diffraction Optical imaging Noise Cameras Optical sensors Lenses

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Online reconstruction of textured triangle meshes from aerial images

Online reconstruction of textured triangle meshes from aeria...

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2013 Eurographics Workshop on Urban Data Modelling and Visualisation, UDMV 2013

作者： Vierjahn, Tom Roters, Jan Moser, Manuel Hinrichs, Klaus Mostafawy, Sina Rmh New Media GmbH Cologne Germany Visualization and Computer Graphics Research Group Department of Computer Science University of Muenster Germany Department of Media FH Duesseldorf University of Applied Sciences Germany

ISBN: (纸本)9783905674460

In this paper we present and evaluate a new online reconstruction algorithm to create a textured triangle mesh from a set of aerial images via an unorganized point cloud. Both the point cloud and the mesh are iteratively refined while allowing new aerial images to be added at any time during reconstruction. Texture coordinates are learnt to instantly visualize an initially rough approximation that gets refined as more data becomes available. The new algorithm improves upon other systems that require the complete data to be acquired beforehand, and that apply offline, non-iterative reconstruction and processing. Thus, our algorithm is perfectly suited for time-critical applications, e. g., strategical visualization platforms for disaster and emergency response. © 2013 The Eurographics Association.

关键词： Iterative methods

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Marking menus for eyes-free interaction using smart phones and tablets

Marking menus for eyes-free interaction using smart phones a...

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IFIP WG 8.4, 8.9, TC 5 International Cross-Domain Conference on Availability, Reliability, and Security in Information Systems and HCI, CD-ARES 2013

作者： Bauer, Jens Ebert, Achim Kreylos, Oliver Hamann, Bernd Computer Graphics HCI Lab. TU Kaiserslautern 67663 Kaiserslautern Germany Institute for Data Analysis and Visualization Department of Computer Science University of California Davis CA 95616 United States

ISBN: (纸本)9783642405105

Large displays are helpful tools for knowledge discovery applications. The increased screen real estate allows for more data to be shown at once. In some cases using virtual reality visualizations helps in creating more useful visualizations. In such settings, traditional input devices are not well-suited. They also do not scale well to multiple users, effectively limiting collaborative knowledge discovery scenarios. Smart phones and tablet computers are becoming increasingly ubiquitous and powerful, even having multi-core CPUs and dedicated Graphic Processing Units (GPUs). Given their built-in sensors they can serve as replacements for currently-used input devices, and provide novel functionality not achieved with traditional devices. Furthermore, their ubiquity ensures that they scale well to multi-user environments, where users can use their own devices. We present an application-independent way to integrate smart phones and tablets into knowledge discovery applications as input devices with additional functionality. This approach is based on Marking Menus, but extends the basic idea by employing the special capabilities of current consumer-level smart phones and tablets. © 2013 IFIP International Federation for Information Processing.

关键词： Smartphones

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Motion compensation and histogram aided methods for persistence in ultrasonic images optimization

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Journal of Computational Information Systems 2013年第13期9卷 5325-5335页

作者： Guo, Dequan Yang, Hongyu Yin, Hao Shao, Dangguo Liu, Dong C. Key Laboratory of Fundamental Synthetic Vision Graphics and Image Science for National Defense Sichuan University Chengdu 610064 China Department of Machinery Engineering Neijiang Vocational and Technical College Neijiang 641100 China School of Computer Science and Engineering Sichuan University Chengdu 610064 China

Ultrasound images are often degraded by electronics noise from circuit system and speckle noise. In the paper, a new persistence approach is proposed. The motion vectors are calculated by maximum-fast-normalized-cross-correlation (MFNCC) with sum table and conjugate direction (CD) search approaches. These improvements can be helpful to increase accuracy and accelerate the motion estimate. The coefficient of the persistence function is determined by the correlation, which is based on the discrepancy histogram between the corresponding points of successive images quantitatively after motion estimation rectified. The signal-to-noise-ratio (SNR) and four texture features are quantitatively verified the effectiveness in kidney images. Experimental results demonstrate that the proposed method works very well in the vivo ultrasound image with noise reduction, smooth and removal shadow of tissue edge in visual appearance. © 2013 by Binary Information Press.

关键词： Motion compensation

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Preparation of unstructured data arrays for face recognition in cross-platform registration systems

Preparation of unstructured data arrays for face recognition...

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International Association of Management science and Engineering Technology

作者： Kazantsev, Nikolai S. Degtyrev, Vladimir M. Department of Computer Graphics Saint-Petersburg Russia National Research University Higher School of Economics BPM Department Science and Education Center of Information Control Technologies Moscow Russia

On the informatics and the software sides the questions of practical security are linked to the unstructured information processing algorithms applicable for the video array frames obtained by cross platform registration systems. Compression solutions become crucially important when the temporal evolution of the video stream exceeds the traffic capacity of the communication network. The basic image processing approach we exploited is to maintain of the highest resolution degree for the main part of the object we survey (for example, a man's face or figure) whilst minimizing the information traffic from the image background by its artificial substitution with a homogeneous color filling. This method allowed us to obtain a significant compression rate (up to 7000). © 2012 WIT Press.

关键词： Image compression

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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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Computing shortest paths amid convex pseudodisks

Computing shortest paths amid convex pseudodisks

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作者： Chen, Danny Z. Hershberger, John Wang, Haitao Department of Computer Science and Engineering University of Notre Dame Notre Dame IN 46556 United States Mentor Graphics Corp. 8005 SW Boeckman Road Wilsonville OR 97070 United States Department of Computer Science Utah State University Logan UT 84322 United States

Multiple objects in the plane are called pseudodisks if the boundaries of any two of them intersect transversely at most twice. Given a set of n (possibly intersecting) convex pseudodisks of O(1) complexity each and two points s and t in the plane, we present an efficient algorithm for computing a shortest s-to-t path avoiding the pseudodisks. After the union of the pseudodisks is computed, which can be done in O(n log n) randomized time or O(n log2 n) deterministic time, our algorithm runs in O(n log n + k) deterministic time, where k is the size of the extended visibility graph of the union of the pseudodisks. Note that k = O(n2) in the worst case. In over two decades, the previously best algorithms for this problem have not improved on the bound of O(n2 log n) time, even when all the pseudodisks are pairwise disjoint disks. Our technique is also applicable to a motion planning problem of finding a shortest path to translate a convex object in the plane from one location to another avoiding a given set of polygonal obstacles, improving the previously best known solution and settling an open problem posed in 1988. Our algorithm actually solves a more general version of the open problem. Further, as a byproduct of our approach, we present an O(n log n+k)- time algorithm for computing the extended visibility graph of a set of n (possibly intersecting) convex pseudodisks in the plane. The previously best known time bound for this visibility problem is O(n2 log n). © 2013 Society for Industrial and Applied Mathematics.

关键词： Motion planning

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WebComets: A tab-oriented approach for browser history visualization

WebComets: A tab-oriented approach for browser history visua...

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International Conference on computer graphics Theory and Applications, GRAPP 2013 and International Conference on Information Visualization Theory and Applications, IVAPP 2013

作者： Cernea, Daniel Truderung, Igor Kerren, Andreas Ebert, Achim Computer Graphics and HCI Group University of Kaiserslautern P.O. Box 3049 D-67653 Kaiserslautern Germany Computer Science Department ISOVIS Group Linnaeus University Vejdes Plats 7 SE-35195 Växjö Sweden

ISBN: (纸本)9789898565464

Web browsers are our main gateways to the Internet. With their help we read articles, we learn, we listen to music, we share our thoughts and feelings, we write e-mails, or we chat. Current Web browser histories have mostly no visualization capabilities as well as limited options to filter patterns and information. Furthermore, such histories disregard the existence of parallel navigation in multiple browser windows and tabs. But a good understanding of parallel browsing behavior is of critical importance for the casual user and the behavioural analyst, while at the same time having implications in the design of search engines, Web sites and Web browsers. In this paper we present WebComets, an interactive visualization for extended browser histories. Our visualization employs browser histories that capture - among others - the tab-oriented, parallel nature of Web page navigation. Results presented in this paper suggest that WebComets better supports the analysis and comparison of parallel browsing and corresponding behavior patterns than common browser histories.

关键词： Visualization

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A study of emotion-triggered adaptation methods for interactive visualization 21

A study of emotion-triggered adaptation methods for interact...

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21st Conference on User Modeling, Adaptation, and Personalization, UMAP 2013

作者： Cernea, Daniel Ebert, Achim Kerren, Andreas University of Kaiserslautern Computer Graphics and HCI Group P.O. Box 3049 KaiserslauternD-67653 Germany Linnaeus University Department of Computer Science ISOVIS Group Vejdes Plats 7 VäxjöSE-35195 Sweden

As the size and complexity of datasets increases, both visualization systems and their users are put under more pressure to offer quick and thorough insights about patterns hidden in this ocean of data. While novel visualization techniques are being developed to better cope with the various data contexts, users find themselves increasingly often under mental bottlenecks that can induce a variety of emotions. In this paper, we execute a study to investigate the effectiveness of various emotion triggered adaptation methods for visualization systems. The emotions considered are boredom and frustration, and are measured by means of brain-computer interface technology. Our findings suggest that less intrusive adaptive methods perform better at supporting users in overcoming emotional states with low valence or arousal, while more intrusive ones tend to be misinterpreted or perceived as irritating.

关键词： Brain computer interface

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