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International Conference on Signals and Electronic Systems, ICSES

作者： Maxim Vashkevich Marek Parfieniuk Alexander Petrovsky Computer Engineering Department Belarusian State University of Informatics and Radioelectronics Minsk Belarus Department of Digital Media and Computer Graphics Bialystok University of Technology Bialystok Poland

The paper presents a systematic approach to synthesizing and implementing fast algorithms for computing the DCT of a power-of-two size. The main features of the obtainable algorithms are regularity of their signal flow graphs and low arithmetic complexity. Multiplierless implementation of the algorithms is based on the algebraic integer (AI) technique. A general AI encoding scheme for fast DCT algorithms is presented. The approach is demonstrated by using it to derive an AI-based low-error fast implementation of the 16-point DCT.

关键词： Polynomials Discrete cosine transforms Artificial intelligence Algebra Encoding Signal processing algorithms

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Image segmentation based on active contours without edges

Image segmentation based on active contours without edges

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IEEE International Conference on Intelligent computer Communication and Processing (ICCP)

作者： Anca Morar Florica Moldoveanu Eduard Gröller Faculty of Automatic Control and Computers University POLITEHNICA of Bucharest Romania Institute of Computer Graphics and Algorithms University of Technology Vienna Austria

There are a lot of image segmentation techniques that try to differentiate between background and object pixels, but many of them fail to discriminate between different objects that are close to each other. Some image characteristics like low contrast between background and foreground or inhomogeneity within the objects increase the difficulty of correctly segmenting images. We designed a new segmentation algorithm based on active contours without edges. We also used other image processing techniques such as nonlinear anisotropic diffusion and adaptive thresholding in order to overcome the images' problems stated above. Our algorithm was tested on very noisy images, and the results were compared to those obtained with known methods, like segmentation using active contours without edges and graph cuts. The new technique led to very good results, but the time complexity was a drawback. However, this drawback was significantly reduced with the use of graphical programming. Our segmentation method has been successfully integrated in a software application whose aim is to segment the bones from CT datasets, extract the femur and produce personalized prostheses in hip arthroplasty.

关键词： Image segmentation Active contours Image edge detection Algorithm design and analysis Computed tomography Anisotropic magnetoresistance

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HeartPad: Real-time visual guidance for cardiac ultrasound

HeartPad: Real-time visual guidance for cardiac ultrasound

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Workshop at SIGGRAPH Asia 2012, WASA 2012

作者： Ford, Steven T. Viola, Ivan Bruckner, Stefan Torp, Hans Kiss, Gabriel Norwegian University of Science and Technology MI Lab. Department of Circulation and Medical Imaging Trondheim Norway Høgskolen I Nord-Trøndelag Norway University of Bergen Norway Christian Michelsen Research Norway Institute of Computer Graphics and Algorithms Vienna University of Technology Austria St. Olavs Hospital Trondheim Norway

ISBN: (纸本)9781450318358

Medical ultrasound is a challenging modality when it comes to image interpretation. The goal we address in this work is to assist the ultrasound examiner and partially alleviate the burden of interpretation. We propose to address this goal with visualization that provides clear cues on the orientation and the correspondence between anatomy and the data being imaged. Our system analyzes the stream of 3D ultrasound data and in real-time identifies distinct features that are basis for a dynamically deformed mesh model of the heart. The heart mesh is composited with the original ultrasound data to create the data-to-anatomy correspondence. The visualization is broadcasted over the internet allowing, among other opportunities, a direct visualization on the patient on a tablet computer. The examiner interacts with the transducer and with the visualization parameters on the tablet. Our system has been characterized by domain specialist as useful in medical training and for navigating occasional ultrasound users. © 2012 ACM.

关键词： Visualization

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Low-delay hearing aid based on cochlear model with nonuniform subband acoustic feedback cancellation

Low-delay hearing aid based on cochlear model with nonunifor...

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European Signal Processing Conference (EUSIPCO)

作者： Maxim Vashkevich Elias Azarov Alexander Petrovsky Department of Computer Engineering Belarusian State University of Informatics and Radioelectronics슠 Minsk Belarus Department of Digital Media and Computer Graphics Bialystok University of Technology Bialystok Poland

ISBN: (纸本)9781467310680

The paper presents a hearing aid (HA) system based on a low-delay cochlear filter bank derived from the discrete cochlear model. The spectral gain shaping method (SGSM) that includes dynamic range compression, hearing loss compensation and noise reduction is applied in perceptually matched frequency bands. The acoustic feedback cancellation is implemented as an off-the-forward path scheme and does not introduce an additional delay to the forward path. The cancellation itself is made by adaptive filtering of non-uniform subband signals obtained from an oversampled warped cosine-modulated filter bank.

关键词： Auditory system Delay Frequency control Noise reduction Gain Speech

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Instantaneous pitch estimation based on RAPT framework

Instantaneous pitch estimation based on RAPT framework

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European Signal Processing Conference (EUSIPCO)

作者： Elias Azarov Maxim Vashkevich Alexander Petrovsky Computer engineering Department Belarusian State University of Informatics and Radioelectronics슠 Minsk Belarus Department of Digital Media and Computer Graphics Bialystok University of Technology Bialystok Poland

ISBN: (纸本)9781467310680

The paper presents a pitch estimation technique based on the robust algorithm for pitch tracking (RAPT) framework. The proposed solution provides estimation of instantaneous pitch values and is not sensitive to rapid frequency modulations. The technique utilizes a different period candidate generating function based on instantaneous harmonic parameters. The function is similar to normalized cross-correlation function, however it represents momentary periodicity with high frequency resolution. The second major revision of RAPT is an additional post-processing procedure that makes estimation values more accurate. The proposed algorithm is compared with other pitch detection algorithms using artificial and natural signals.

关键词： Estimation Harmonic analysis Speech Power harmonic filters Frequency modulation Frequency estimation Signal processing algorithms

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Social media use for large event management: The application of social media analytic tools for the Super Bowl XLVI

Social media use for large event management: The application...

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IEEE Conference on Technologies for Homeland Security

作者： Israa Bukhari Cliff Wojtalewicz M. Vorvoreanu J. Eric Dietz Computer Graphics Technology Purdue University West Lafayette IN USA Purdue Homeland Security Institute Purdue University West Lafayette IN USA Computer Information Technology Purdue University West Lafayette IN USA

Using social media analytics tools, Radian6 and Visible Technologies, Purdue Homeland Security Institute (PHSI) researchers were able to monitor, capture and analyze publicly posted online information pertaining to the Super Bowl XLVI. The study collected and analyzed data regarding the public's perceptions of the Super Bowl XLVI marketing campaign, as well as Indianapolis' hospitality, accommodations, and safety. Data was collected from three different platforms: Facebook, Twitter, and blogs. The results of the study provided insights into public sentiment, public dialogue regarding specific citywide events, and trending social media topics associated with each topic's keyword analysis. In our research we further explored the potential usage and application of social media analytics tools within local government and found that social media analytics can be of great value for the government in both special events and routine activities. Major applications of social media analytics as well as research questions and issues worth exploring in the future, including improving information flow and analytics for routine operations, are discussed.

关键词： Media Monitoring Twitter Facebook Local government Games Cities and towns

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A scalable repository infrastructure for CH digital object management

A scalable repository infrastructure for CH digital object m...

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International Conference on Virtual Systems and MultiMedia

作者： X. Pan T. Schiffer M. Schröttner S. Havemann M. Hecher R. Berndt D. W. Fellner Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Graz Austria Fraunhofer Austria Research Visual Computing Graz Austria

In recent decades, researchers of archaeological 3D digitalization found that the collection and archive of processing intermediate data are extremely tiresome tasks. They need large of man power and material resources, even though, mistakes can be raised and break the whole working chain. The traditional documentation of digitalization process is also a pending challenge, although, the ISO standard CIDOC-CRM (ISO 21127:2006) has been introduced to the archaeologists and museum professionals since years, but there are still some obvious gaps between practice and theory: (1) How to connect the discrete archaeologists, museums, CH research institutions, and the public? (2) How to ensure the integrity of whole digitalization process and simplify the process? (3) How to maximize the usability of the public digital objects in CH community? (4) How to long term preserve the huge amount of datasets? (5) How to present and disseminate the digital object to the public? This paper presents an operational and optimal infrastructure that realizes not only a distributed storage system, but also a content management system. This infrastructure works as a backbone of whole digitalization process, provides a complete solution suite for archaeologists, museum professionals, museum visitors, and IT technicians.

关键词： Solid modeling Databases Servers Semantics Data models Usability System analysis and design

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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics): Preface

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2012年 7476 LNCS卷 V-VI页

作者： Bischof, Horst Pinz, Axel Pock, Thomas Graz University of Technology Electrical Measurement and Measurement Signal Processing Kronesgasse 5 8010 Graz Austria Graz University of Technology Institute for Computer Graphics and Vision Inffeldgasse 16 8010 Graz Austria

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BurnAR: Feel the heat

BurnAR: Feel the heat

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International Symposium on Mixed and Augmented Reality (ISMAR)

作者： Peter Weir Christian Sandor Matt Swoboda Thanh Nguyen Ulrich Eck Gerhard Reitmayr Arindam Dey Magic Vision Lab University of South Australia Adelaide Australia Fairlight Institute of Computer Graphics and Vision Graz University of Technology Graz Austria

Augmented Reality systems that run interactively and in real time, using high quality graphical displays and sensational cues, can create the illusion of virtual objects appearing to be real. This paper presents the design and implementation of BurnAR, a demonstration which enables users to experience the illusion of seeing their own hands burning, which we achieve by overlaying virtual flames and smoke on their hands. Surprisingly, some users reported an involuntary warming sensation of their hands.

关键词： Image color analysis Streaming media Cameras Augmented reality Image segmentation USA Councils

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Tablet versus phone: Depth perception in handheld augmented reality

Tablet versus phone: Depth perception in handheld augmented ...

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International Symposium on Mixed and Augmented Reality (ISMAR)

作者： Arindam Dey Graeme Jarvis Christian Sandor Gerhard Reitmayr University of South Australia Adelaide SA AU Magic Vision Laboratory University of South Australia Institute of Computer Graphics and Vision Graz University of Technology

Augmented Reality (AR) applications on mobile devices like smartphones and tablet computers have become increasingly popular. In this paper, for the first time in the AR domain, we present: (1) the influence of different handheld displays and (2) the exocentric depth perception. Unlike egocentric depth perception, exocentric depth perception has not been investigated in AR. We have selected a suitable vision-based tracking method for our user studies based on a set of evaluations. Then we have investigated the effect of display size and resolution through two user studies. One study investigated the effect of different displays on egocentric depth perception. The other study investigated the effect of displays on exocentric and ordinal depth perception. Interestingly, we noticed depth compression is less when using a mobile phone, while participants subjectively preferred a tablet. A similar effect was also noticed in exocentric depth perception. The tablet provided significantly better ordinal depth perception and faster response time than the mobile phone. In both of the studies, we found no effect of the AR X-ray visualization on depth perception. Both egocentric and exocentric distances were underestimated.

关键词： Visualization Mobile handsets Cameras Target tracking Mobile communication Estimation

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