检索结果-内蒙古大学图书馆

International Conference on Automatic Face and Gesture Recognition

作者： F. Tsalakanidou S. Malassiotis M.G. Strintzis Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece Informatics and Telematics Institute Centre for Research and Technology Hellas Thessaloniki Greece

This work presents a complete face authentication system integrating 2D intensity and 3D range data, based on a low-cost, real-time structured light sensor. Novel algorithms are proposed that exploit depth data to achieve robust face detection, localization and authentication under conditions of background clutter, occlusion, face pose alteration and harsh illumination. The well known embedded hidden Markov model technique for face authentication is applied to depth maps. A method for the enrichment of face databases with synthetically generated views depicting various head poses and illumination conditions is proposed. The performance of the proposed system is tested on an extensive face database of 3,000 images. Experimental results demonstrate significant gains resulting from the combined use of depth and intensity.

关键词： Authentication Face detection Lighting Image databases Real time systems Sensor systems Robustness Hidden Markov models Head System testing

来源：评论

学校读者我要写书评

暂无评论

Exploitation of 3D images for face authentication under pose and illumination variations

Exploitation of 3D images for face authentication under pose...

引用

International Symposium on 3D Data Processing Visualization and Transmission

作者： F. Tsalakanidou S. Malassiotis M.G. Strintzis Informatics and Telematics Institute Centre for Research and Technology Hellas Thessaloniki Greece Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece

An appearance-based face authentication system integrating 2D color or intensity images and 3D data is presented. The proposed system is based on a low-cost 3D and color sensor, capable of synchronous real-time acquisition of 3D images and associated color images. Novel algorithms are proposed that exploit depth information and prior knowledge of face geometry and symmetry to achieve robust face detection, localization and authentication under conditions of background clutter, occlusion, face pose alteration and harsh illumination. A method for the enrichment of face databases with synthetically generated views depicting variations in pose and illumination is proposed to cope with head rotations and illumination variations, avoiding a cumbersome enrolment process. The performance of the proposed authentication scheme is tested thoroughly on a face database of 1500 images, recorded with the 3D acquisition system. Experimental results demonstrate significant gains resulting from the combined use of depth and color or intensity information, in comparison to the use of 2D images alone.

关键词： Authentication Lighting Face detection Image databases Image sensors Sensor systems Real time systems Color Information geometry Robustness

来源：评论

学校读者我要写书评

暂无评论

Combining multiple segmentation algorithms and the MPEG-7 eXperimentation model in the Schema reference system

Combining multiple segmentation algorithms and the MPEG-7 eX...

引用

International Conference on Information Visualisation (IV)

作者： V. Mezaris H. Doulaverakis R.M.B. de Otalora S. Herrmann I. Kompatsiaris M.G. Strintzis Informatics and Telematics Institute (ITI) Centre for Research and Technology Hellas Thessaloniki Greece Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece Institute for Integrated Systems Munich University of Technology Munich Germany

The SCHEMA Network of Excellence aims to bring together a critical mass of universities, research centers, industrial partners and end users, in order to design a reference system for content-based semantic scene analysis, interpretation and understanding. In this paper, advances in the development of the SCHEMA reference system are reported, focusing on the application of region-based image retrieval using automatic segmentation. More specifically, the integration of four segmentation algorithms and the MPEG-7 eXperimentation Model with the reference system are discussed, along with the motivation behind these and various other choices that were made during the development of the reference system. Experimental results for this system, as well as results for an earlier version of it employing proprietary descriptors, are shown using a common collection of images. Comparative evaluation of these versions, both in terms of retrieval accuracy and in terms of time-efficiency, allows the evaluation of the reference system as a whole as well as the evaluation of the usability of different components integrated with it, such as the MPEG-7 eXperimentation Model. These results illustrate the efficiency of the proposed system, as well as its suitability in serving as a test-bed for evaluating and comparing different algorithms and approaches pertaining to the content-based and semantic manipulation of visual information.

关键词： MPEG 7 Standard Image retrieval Image segmentation Content based retrieval Information retrieval Image analysis Information processing Laboratories computer networks Design engineering

来源：评论

学校读者我要写书评

暂无评论

Aligning simulation models of smallpox outbreaks

Aligning simulation models of smallpox outbreaks

引用

2nd Symposium on Intelligence and Security informatics, ISI 2004

作者： Chen, Li-Chiou Kaminsky, Boris Tummino, Tiffany Carley, Kathleen M. Casman, Elizabeth Fridsma, Douglas Yahja, Alex Institute for Software Research International School of Computer Science Carnegie Mellon University PittsburghPA15213 United States Department of Engineering and Public Policy Carnegie Mellon University PittsburghPA15213 United States Center for Biomedical Informatics School of Medicine University of Pittsburgh PittsburghPA15213 United States

ISBN: (纸本)9783540221258

We aligned two fundamentally different models of smallpox transmission after a bioterrorist attack: A location-explicit multi-agent model (Bio- War) and the conventional epidemiological box model, called a SIR model for Susceptible-Infected-Recovered. The purpose of this alignment is part of a greater validation process for BioWar. From this study we were able to contribute to the overall validation of the complex agent based model, showing that, at the minimum, the epidemiological curves produced by the two models were approximately equivalent, both in overall and the time course of infection and mortality. Subtle differences on the model results revealed the impact of heterogeneous mixing in the spread of smallpox. Based on this foundation, we will be able to further investigate the policy responses against the outbreaks of contagious diseases by improving heterogeneous properties of agents, which cannot be simulated in a SIR model. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Autonomous agents

来源：评论

学校读者我要写书评

暂无评论

A GA-based multi-purpose optimization algorithm for QoS routing

A GA-based multi-purpose optimization algorithm for QoS rout...

引用

Proceedings - 18th International Conference on Advanced Information Networking and Applications, AINA 2004

作者： Koyama, Akio Barolli, Leonard Matsumoto, Kazunori Apduhan, Bernady O. Department of Informatics Yamagata University 4-3-16 Jonan Yonezawa Yamagata 992-8510 Japan Dept. of Information Engineering Fukuoka Institute of Technology 3-30-1 Wajiro-Higashi Higashi-ku Fukuoka 811-0295 Japan Department of Computer Software University of Aizu Tsuruga Ikki-machi Aizu-Wakamatsu 965-8580 Fukushima Japan Dept. of Intelligent Informatics Kyushu Sangyo University 2-3-1 Matsukadai Higashi-ku Fukuoka 813-8503 Japan

ISBN: (纸本)0769520510

The routing algorithms for multimedia communication should use for routing more than one QoS parameter. This is because new services such as video on demand and remote meeting systems require better QoS. However, the problem of QoS routing is difficult and to find a feasible route with two independent path constraints is NP-complete. Also, QoS routing algorithms for broadband networks must be adaptive, flexible, and intelligent for efficient network management. In this paper, we propose a multipurpose optimization method for QoS routing based on Genetic Algorithm (GA). The simulation results show that proposed method has a good performance and is a promising method for QoS routing.

关键词： Routers

来源：评论

学校读者我要写书评

暂无评论

Bandwidth efficient transmission through sparse channels using a parametric channel estimation-based DFE

Bandwidth efficient transmission through sparse channels usi...

引用

IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

作者： A.A. Rontogiannis K. Berberidis Institute of Space Applications and Remote Sensing National Observatory of Athens Athens Greece Department of Computer Engineering & Informatics / R.A.C.T.I-Research and Development University of Patras Rio-Patras Greece

A novel equalization schemes based on parametric channel estimation is presented. The proposed scheme is appropriate for channels with long and sparse impulse response such as encountered in high definition digital video transmission systems. The main trait of the channel estimation part is that instead of seeking the whole channel impulse response (CIR), only the unknown time delays and attenuation factors of the physical channel multipath components are efficiently estimated. The equalization part comprises an adaptive decision feedback equalizer (DFE), whose initialization part is properly designed for sparse channels. The information needed in the initialization part is provided by the channel estimation part. The DFE converges much faster compared to the conventional DFE and the whole scheme utilizes a very short training sequence and hence a significant saving in bandwidth is achieved.

关键词： Bandwidth Channel estimation Decision feedback equalizers Delay effects Attenuation Adaptive equalizers Multipath channels HDTV Interference Observatories

来源：评论

学校读者我要写书评

暂无评论

Image improvement in pinhole SPECT using complete data acquisition combined with statistical image reconstruction

引用

International Congress Series 2004年第C期1265卷 101-105页

作者： Zeniya, Tsutomu Watabe, Hiroshi Aoi, Toshiyuki Kim, Kyeong Min Teramoto, Noboru Hayashi, Takuya Sohlberg, Antti Kudo, Hiroyuki Iida, Hidehiro Department of Investigative Radiology National Cardiovascular Center Research Institute Suita Osaka 565-8565 5-7-1 Fujishiro-dai Japan Department of System Science Graduate School of Informatics Kyoto University Kyoto 606-8501 Yoshida-Honmachi Sakyo Japan Department of Clinical Physiology and Nuclear Medicine Kuopio University Hospital FIN-70211 Kuopio P.O. Box 1777 Finland Department of Computer Science Graduate School of Systems and Information Engineering University of Tsukuba Ibaraki 305-8573 1-1-1 Tennoudai Tsukuba Japan

Pinhole single-photon emission computed tomography (SPECT) with high spatial-resolution is suitable for small-animal imaging, but has limitations associated with spatial-resolution inhomogeneity or axial blurring. We have hypothesized that this blurring is due to incompleteness of projection data acquired by a single circular pinhole orbit. And we have developed a pinhole SPECT system with two circular orbits which satisfy Tuy's condition so as to provide complete data for 3D pinhole SPECT reconstruction within the whole field-of-view (FOV);a dedicated 3D ordered subsets expectation maximization (3D-OSEM) reconstruction method for two-orbit data. This study is aimed at evaluating accuracy and impact of this system. In this system, not the camera but the object rotates and the two orbits are 90° and 45° relative to object's axis. Experiments using a multiple-disk phantom filled with ^99mTc solution and a mouse bone scan using ^99mTc-labeled HMDP agent were carried out. The Feldkamp's filtered back-projection (FBP) method and the 3D-OSEM method were applied to these data sets. The axial blurring was apparent on images reconstructed by FBP for single-orbit data, while the 3D-OSEM using two-orbit data dramatically improved the resolution homogeneity and statistical noise property, and also demonstrated considerably better image quality in the mouse scan. © 2004 Elsevier B.V.

关键词： Complete data acquisition Pinhole SPECT Small animal Statistical image reconstruction Tuy's condition

来源：评论

学校读者我要写书评

暂无评论

Spatial, temporal and spatio-temporal databases - Hot issues and directions for PhD research

Spatial, temporal and spatio-temporal databases - Hot issues...

引用

作者： Roddick, John F. Egenhofer, Max J. Hoel, Erik Papadias, Dimitris Salzberg, Betty Sch. of Informatics and Engineering Flinders University GPO Box 2100 Adelaide SA 5001 Natl. Ctr. for Geogr. Info./Analysis University of Maine Orono ME 04469-5711 United States Research and Development Environ. Systems Research Institute 380 New York Street Redlands CA 92373 United States Department of Computer Science Hong Kong Univ. of Sci./Technology Clearwater Bay Hong Kong Hong Kong Coll. of Comp./Information Science Northeastern University Boston MA 02115 United States

Spatial and temporal database systems, both in theory and in practice, have developed dramatically over the past two decades to the point where usable commercial systems, underpinned by a robust theoretical foundation, are now starting to appear. While much remains to be done, topics for research must be chosen carefully to avoid embarking on impractical or unprofitable areas. This is particularly true for doctoral research where the candidate must build a tangible contribution in a relatively short time. The panel session at the Eighth International Symposium on Spatial and Temporal Databases (SSTD 2003) held on Santorini Island, Greece [7] in July 2003 thus took as its focus the question What to focus on (and what to avoid) in Spatial and Temporal Databases : recommendations for doctoral research. This short paper, authored by the panel members, summarizes these discussions.

关键词： Database systems

来源：评论

学校读者我要写书评

暂无评论

Issues for the performance monitoring on networked virtual environments: The case of EVE 7

Issues for the performance monitoring on networked virtual e...

引用

7th International Conference on Telecommunications, ConTEL 2003

作者： Bouras, C. Giannaka, E. Tsiatsos, Th. Research Academic Computer Technology Institute Computer Engineering and Informatics Dept. Univ. of Patras Patra Greece

ISBN: (纸本)9531840520

The wide expansion and increasing demand for Networked Virtual Environments resulted in efforts for the optimization of these environments with the enhancement of advanced features, which offered extended functionality and created an improved sense of realism. However, the added functionality often creates resource overhead both in the system as well as in the network host, which results in performance reduction. This paper presents such a networked virtual environment and based on the system's architecture tries to trace down with the time and recourse consuming parameters and proposes models on which a networked virtual environment, like the one presented, could achieve optimization of its performance. © 2003, institute of Electrical and Electronics Engineers Inc. All rights reserved.

关键词： Virtual reality

来源：评论

学校读者我要写书评

暂无评论

Offering open hypermedia services to the WWW: A step-by-step approach for developers 03

Offering open hypermedia services to the WWW: A step-by-step...

引用

12th International Conference on World Wide Web, WWW 2003

作者： Karousos, Nikos Pandis, Ippokratis Reich, Siegfried Tzagarakis, Manolis Research Academic Computer Technology Institute 26500 Rion Greece Dept. of Computer Engineering and Informatics University of Patras 26500 Rion Greece Salzburg Research Austria

ISBN: (纸本)1581136803

Hypermedia systems and more specifically open hypermedia systems (OHS) provide a rich set of implementations of different hypertext flavors such as navigational hypertext, spatial hypertext or taxonomic hypertext. Additionally, these systems offer component-based modular architectures and address interoperability between hypertext domains. Despite multiple efforts of integrating Web clients, a widespread adoption of OHS technology by Web developers has not taken place. In this paper it is argued that Web Services - which offer a component model for Web applications - can be integrated in OHSs. An architectural integration is proposed, a step-by-step process is outlined and an example of integration is provided. This very approach is aimed to benefit both worlds: the Web community with new rich hypermedia functionality that extends the current navigational hypermedia, and the OHS community by opening its tools and platforms to the many developer groups of the Web community.

关键词： Hypermedia systems

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：