检索结果-内蒙古大学图书馆

IEEE International Conference on Data Mining (ICDM)

作者： Yanhua Chen Manjeet Rege Ming Dong Jing Hua Department of Computer Science Machine Vision and Pattern Recognition Laboratory Detroit MI USA Department of Computer Science Graphics and Imaging Laboratory Detroit MI USA

Document clustering without any prior knowledge or background information is a challenging problem. In this paper, we propose SS-NMF: a semi-supervised non- negative matrix factorization framework for document clustering. In SS-NMF, users are able to provide supervision for document clustering in terms of pairwise constraints on a few documents specifying whether they "must" or "cannot" be clustered together. Through an iterative algorithm, we perform symmetric tri-factorization of the document- document similarity matrix to infer the document clusters. Theoretically, we show that SS-NMF provides a general framework for semi-supervised clustering and that existing approaches can be considered as special cases of SS-NMF. Through extensive experiments conducted on publicly available data sets, we demonstrate the superior performance of SS-NMF for clustering documents.

关键词： Iterative algorithms Clustering algorithms Symmetric matrices Data mining Databases Clustering methods Couplings Machine vision Pattern recognition computer graphics

来源：评论

学校读者我要写书评

暂无评论

Simulation of the handling of real objects with a complete control of rotation

引用

Information Technology Journal 2007年第5期6卷 672-680页

作者： Nini, Brahim Batouche, Mohamed Larbi Ben M'hidi University 04000 Oum El-bouaghi Algeria LIRE Laboratory Vision and Computer Graphics Group Mentouri University 25000 Constantine Algeria

This study describes a complete movie-based solution for simulating the manipulation of a real object in three rotational degrees of freedom. The solution uses a linear structure to store the frames corresponding to different viewing directions of the object. Simulating rotations is then equivalent to orbiting a virtual camera around the object and projecting what it is supposed to grab. The method links these rotations with those of the real camera while grabbing in order to extract the corresponding frames. This correspondence is geometry-based and expressed in an analytical way. The solution is entirely parameterised and independent of the number of taken images. Consequently, this study is an assessment of the mathematical background of an image-based manipulation using a specific organization both in the grab and storage of the images. In fact, the research provides a complement matter to some works which detail explicit mathematical concepts related to scene navigation but, in general, they do not emphasize the ones related to object manipulation. © 2007 Asian Network for Scientific Information.

关键词： Image analysis

来源：评论

学校读者我要写书评

暂无评论

The self-paced graz brain-computer interface: Methods and applications

引用

Computational Intelligence and Neuroscience 2007年第1期2007卷 79826页

作者： Scherer, Reinhold Schloegl, Alois Lee, Felix Bischof, Horst Janša, Janez Pfurtscheller, Gert Laboratory of Brain-Computer Interfaces Institute for Knowledge Discovery Graz University of Technology 8010 Graz Krenngasse 37 Austria NeuroCenter Styria Graz 8010 Krenngasse 37/I Austria Intelligent Data Analysis Group Fraunhofer-Institut für Rechnerarchitektur und Softwaretechnik FIRST 12489 Berlin Kekulestrasse 7 Germany Institute for Computer Graphics and Vision Graz University of Technology 8010 Graz Inffeldgasse 16 Austria Aksioma - Institute for Contemporary Art 1000 Ljubljana Neubergerjeva 25 Slovenia

We present the self-paced 3-class Graz brain-computer interface (BCI) which is based on the detection of sensorimotor electroencephalogram (EEG) rhythms induced by motor imagery. Self-paced operation means that the BCI is able to determine whether the ongoing brain activity is intended as control signal (intentional control) or not (non-control state). The presented system is able to automatically reduce electrooculogram (EOG) artifacts, to detect electromyographic (EMG) activity, and uses only three bipolar EEG channels. Two applications are presented: the freeSpace virtual environment (VE) and the Brainloop interface. The freeSpace is a computer-game-like application where subjects have to navigate through the environment and collect coins by autonomously selecting navigation commands. Three subjects participated in these feedback experiments and each learned to navigate through the VE and collect coins. Two out of the three succeeded in collecting all three coins. The Brainloop interface provides an interface between the Graz-BCI and Google Earth.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Hybrid Cutting of Deformable Solids

Hybrid Cutting of Deformable Solids

引用

IEEE Annual International Symposium Virtual Reality

作者： D. Steinemann M. Harders M. Gross G. Szekely Computer Graphics Laboratory ETH Zurich Switzerland Computer Vision Laboratory ETH Zurich Switzerland

A central training objective of virtual reality based surgical simulation is the removal of pathologic tissue. This necessitates stable, real-time updates of the underlying mesh representation. Within the framework of a hysteroscopy simulator, we have developed a hybrid cutting approach for tetrahedral meshes. It combines the topological update by subdivision with adjustments of the existing topology. Moreover, the mechanical and the visual model are decoupled, thus allowing different resolutions for the underlying mesh representations. With our method, we can closely approximate an arbitrary, user-defined cut surface while avoiding the creation of small or badly shaped elements, thus strongly reducing stability problems in the subsequent deformation computation. The presented approach has been integrated into a virtual reality training system for hysteroscopic interventions. The performance of the algorithm is demonstrated by examples of intra-uterine tumor ablations.

关键词： Solids Computational modeling Virtual reality Deformable models Laboratories Surgery Electrodes Cutting tools Pathology computer graphics

来源：评论

学校读者我要写书评

暂无评论

Modelling and Handling Seams in Wide-Area Sensor Networks

Modelling and Handling Seams in Wide-Area Sensor Networks

引用

International Symposium on Wearable computers

作者： Joseph Newman Gerhard Schall Dieter Schmalstieg Computer Laboratory University of Cambridge UK Institute for Computer Graphics and Vision Graz University of Technology Austria

ISBN: (纸本)1424405971

The fields of wearable computing, augmented reality and ubiquitous computing are in principle highly convergent, as they all promise a Utopian future in which the devices embedded in the environment, our bodies and our clothes will have reached a level integration such that we can intuitively perceive and interact with our environment. However, the reality as practised in research labs and limited commercial deployments has been that budgetary and technical constraints have actually kept these fields separate and distinct. One manifestation of this separation is in the choice of sensors used to build systems in each domain. A truly cross-disciplinary project has to incorporate sensors of much greater heterogeneity than has occurred heretofore. The way in which sensors are deployed results in spatial seams that can act as obstacles to the provision of services across different areas. This paper takes an architectural approach to handling events from different tracking systems and maintaining a consistent spatial model of people and objects. The principal distinguishing feature is the automatic derivation of dataflow network of distributed sensors, dynamically and at run-time, based on requirements expressed by clients.

关键词： Pervasive computing Virtual reality Wearable sensors Augmented reality Bandwidth Wearable computers Ubiquitous computing Sensor systems Runtime Sensor phenomena and characterization

来源：评论

学校读者我要写书评

暂无评论

Virtual object manipulation in collaborative augmented reality environment

Virtual object manipulation in collaborative augmented reali...

引用

2004 IEEE International Conference on Industrial Technology, ICIT

作者： Nini, Brahim Batouche, Mohamed Chaouki LIRE Laboratory Vision and Computer Graphics Group Mentouri University 25000 Constantine Algeria

Sometimes, it is difficult to buy objects in the sense of there not evident adaptation to the anticipated place. To facilitate this operation, it would be possible to study virtually the disposition without being obliged to proceed to a real displacement. The augmented reality is one area to allow such operation since the essence of its principle is that. It would be possible to visualize objects to sell in a scene corresponding to the site of the customer. The salesman and the client would be able to 'discuss' of possible dispositions. In this article, we present one foundation of this realization. In the occurrence, how the manipulation of virtual objects is possible for the operation of disposition. Then we present a simple method of shared manipulation in a network. © 2004 IEEE.

关键词： Virtual reality

来源：评论

学校读者我要写书评

暂无评论

Virtual object manipulation in collaborative augmented reality environment

Virtual object manipulation in collaborative augmented reali...

引用

IEEE International Conference on Industrial Technology (ICIT)

作者： B. Nini M.C. Batouche Faculty of Engineering LIRE laboratory Vision and Computer Graphics Group Mentouri University Constantine Algeria

Sometimes, it is difficult to buy objects in the senses of its not evident adaptation to the anticipated place. To facilitate this operation, it would be possible to study virtually the disposition without being obliged to proceed to a real displacement. The augmented reality is one area to allow such operation since the essence of its principle is that. It would be possible to visualize objects to sell in a scene corresponding to the site of the client The salesman and the client would be able to 'discuss' of possible dispositions. In this article, we present one foundation of this realization. In the occurrence, how the manipulation of virtual objects is possible for the operation of disposition. Then we present a simple method of shared manipulation in a network.

关键词： Collaboration Augmented reality Layout Chaos computer graphics Visualization Video sequences Visual communication Context Collaborative work

来源：评论

学校读者我要写书评

暂无评论

Robust registration of virtual objects for industrial applications

Robust registration of virtual objects for industrial applic...

引用

IEEE International Conference on Industrial Technology (ICIT)

作者： B. Fergani M.C. Batouche B. Boufama Computer Science Department Faculty of Engineering LIRE laboratory Vision and Computer Graphics Group Mentouri University Constantine Algeria School of Computer Science University of Windsor Windsor Canada

vision-based registration techniques for augmented reality systems have been the subject of intensive research recently due to their potential to accurately align virtual objects with the real world. The registration process can be done in three steps: 1) Positioning: put the virtual object at a desired position. 2) Rendering: get the 2D image of the positioned 3D virtual object 3) The rendering of the virtual object will then be merged with the image of real environment to compose an augmented image. Rendering the virtual object is not trivial work, since it not only depends on its 3D location and orientation, but also depends on the camera's location and orientation. When the camera undergoes a transformation, the parameters for rendering will also be accordingly changed. Therefore, for a realtime augmented reality system, the camera pose must be dynamically tracked at frame rate. In order to simulate the real camera, we have to know its intrinsic and extrinsic parameters. The intrinsic parameters describe camera's optical, geometric and digital characteristics. The extrinsic parameters describe position and orientation of the camera. Both intrinsic and extrinsic parameters can be estimated through a camera calibration process (for example Zonglei and Boufama's method). However, calibrating the camera in real-time, for applications similar to industry, is not necessary (for example Kutulakos & vallino's method). In this paper we present our framework based on Zonglei & Boufama's approach and we describe Kutulakos & vallino's approach (we haven't yet results).

关键词： Robustness Augmented reality Rendering (computer graphics) computer science Virtual reality Laboratories computer graphics Digital cameras Geometrical optics Parameter estimation

来源：评论

学校读者我要写书评

暂无评论

Communication via eye blinks and eyebrow raises: Video-based human-computer interfaces

引用

Universal Access in the Information Society 2003年第4期2卷 359-373页

作者： Grauman, K. Betke, M. Lombardi, J. Gips, J. Bradski, G.R. Vision Interface Group AI Laboratory Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States Computer Science Department Boston University 111 Cummington St BostonMA02215 United States EagleEyes Computer Science Department Boston College Fulton Hall Chestnut HillMA02467 United States Vision Graphics and Pattern Recognition Microcomputer Research Laboratory Intel Corporation SC12-303 2200 Mission College Blvd Santa ClaraCA95054-1537 United States

Two video-based human-computer interaction tools are introduced that can activate a binary switch and issue a selection command. "BlinkLink," as the first tool is called, automatically detects a user's eye blinks and accurately measures their durations. The system is intended to provide an alternate input modality to allow people with severe disabilities to access a computer. Voluntary long blinks trigger mouse clicks, while involuntary short blinks are ignored. The system enables communication using "blink patterns:" sequences of long and short blinks which are interpreted as semiotic messages. The second tool, "EyebrowClicker," automatically detects when a user raises his or her eyebrows and then triggers a mouse click. Both systems can initialize themselves, track the eyes at frame rate, and recover in the event of errors. No special lighting is required. The systems have been tested with interactive games and a spelling program. Results demonstrate overall detection accuracy of 95.6% for BlinkLink and 89.0% for EyebrowClicker. © Springer-Verlag 2003.

关键词： computer vision

来源：评论

学校读者我要写书评

暂无评论

Classification of carbide distributions using scale selection and directional distributions

Classification of carbide distributions using scale selectio...

引用

IEEE International Conference on Image Processing

作者： K. Wiltschi T. Lindeberg A. Pinz Institute for Computer Graphics and Vision Technical University of Graz Austria Computational Vision and Active Perception Laboratory KTH Stockholm Sweden

We present an automatic method for the classification of steel quality based on scale-space operations. The carbide distribution of microscopic specimen images is assessed by classifying according to so-called 'degree' and 'type' of the specimen. 'Degree' is represented by features extracted with automatic scale selection, and 'type' information is computed from second-moment descriptors. In combination with a morphological verification scheme, this pattern classifier shares large similarities with current manual techniques. Compared to previous work, the new classification scheme has several advantages: the significant scale of the carbide agglomeration is calculated explicitly, and the method is less sensitive to the variance of spatial connectivity than a morphological approach.

关键词： Steel computer vision Microscopy Shape Kernel Detectors computer graphics Laboratories Feature extraction Data mining

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：