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Scalable temporal interest points for abstraction and classification of video events

Scalable temporal interest points for abstraction and classi...

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Seung-Hoon Han ln-So Kweon Digital Media R&D Center Samsung Electronics Company Limited South Korea Robotics and Computer Vision Laboratory Division of Electrical Engineering Department of EECS Korea Advanced Institute of Science and Technology South Korea

The image sequence of a static scene includes similar or redundant information over time. Hence, motion-discontinuous instants can efficiently characterize a video shot or event. However, such instants (key frames) are differently identified according to the change of velocity and acceleration of motion, and such scales of change might be different on each sequence of the same event. In this paper, we present a scalable video abstraction in which the key frames are obtained by the maximum curvature of camera motion at each temporal scale. The scalability means dealing with the velocity and acceleration change of motion. In the temporal neighborhood determined by the scale, the scene features (motion, color, and edge) can be used to index and classify the video events. Therefore, those key frames provide temporal interest points (TIPs) for the abstraction and classification of video events.

关键词： Layout Acceleration Cameras Humans Research and development Robot vision systems computer vision Laboratories Image sequences Scalability

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Power splitters for ultralow refractive index metallic nanostructures waveguides

Power splitters for ultralow refractive index metallic nanos...

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SBMO/IEEE MTT-S International Conference on Microwave and Optoelectronics (IMOC)

作者： V.F. Rodriguez-Esquerre M. Koshiba H.E. Hernandez-Figueroa C.E. Rubio-Mercedes Division of Media and Network Technologies Hokkaido University Japan Department of Microwave and Optics School of Electrical and Computer Engineering State University of Campinas-UNICAMP Brazil Center of Exact Sciences and Technology State University of Mato Grosso do Sul Brazil

We investigated power splitters in air core waveguides with a metallic photonic crystal cladding. The mechanism of propagation in these guides is the total external reflection. The cladding is formed by a periodic arrangement of metallic wires on square or triangular lattices. Power splitters can be designed by modifying the geometry at the splitting region by introducing a reflecting structure in order to increase the transmission coefficient. Some splitters based on these structures are analyzed by an efficient frequency domain finite element approach.

关键词： Refractive index Nanostructures Optical waveguides Lattices Silver Copper Gold Electromagnetic waveguides Optical refraction Optical variables control

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Real time head tracking via camera saccade and shape-fitting

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2nd International Conference on Image Analysis and Recognition, ICIAR 2005

作者： Zhang, Jason Z. Lu, Ye Wu, Q.M. Jonathan Micro-technology and Sensing Group Institute for Fuel Cell Innovation National Research Council of Canada Vancouver BC V6T 1W5 Canada Vision and Media Laboratory School of Computing Science Simon Fraser University Burnaby BC V5A 1S6 Canada Department of Electrical and Computer Engineering University of Windsor Ont. N9B 3P4 Canada

ISBN: (纸本)3540290699

This paper presents a system that tracks human heads in real-time under unconstrained environments where target occlusion, varying illumination, and cluttered backgrounds exist. Tracking is formulated as an active visual servo problem based on the integration of a saccade and a smooth pursuit processes. The head is modelled as an ellipse computed from the color clusters of candidate targets using a robust least square ellipse fitting algorithm. The Farnsworth Perceptually Uniform Color Model is employed to represent the color information of the visual objects. Kalman filtering is applied to the head ellipse to track the evolution of the position, size, and orientation of the target such that the occlusion of objects with similar color and shape as those of the target are effectively accommodated. Experiments with tracking scenarios demonstrate the effectiveness of the system. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Tracking (position)

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Adaptive source and channel re-encoding to maximize tandem link performance

Adaptive source and channel re-encoding to maximize tandem l...

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2004 First International Symposium on Control, Communications and Signal Processing, ISCCSP 2004

作者： Gibson, Jerry D. Wei, Bo Media Arts Technology Program Electrical and Computer Engineering Univ. of California Santa Barbara Santa Barbara CA 93106-6065 Department of Electrical Engineering Southern Methodist University Dallas TX 75275

ISBN: (纸本)0780383796

We investigate the issues in voice communications over tandem heterogeneous network connections which require multiple source decoding/encoding operations. While it is known from speech coding research that tandem connections of different speech coders can extract a substantial performance penalty, it is shown that the use of error concealment and source re-encoding can improve system performance in the presence of channel impairments such as bit errors and packet losses. A new protocol is proposed for wireless LANs that reduces retransmissions and discarded packets, and hence reduces system delay and facilitates packet loss concealment.

关键词： Signal encoding

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Joint semi-blind channel estimation and data detection for MIMO-OFDM systems

Joint semi-blind channel estimation and data detection for M...

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Proceedings of the IEEE 6th Circuits and Systems Symposium on Emerging Technologies: Frontiers of Mobile and Wireless Communication

作者： Yue, Jiang Kim, Kyeong Jin Reid, Tony Gibson, Jerry D. Department of Electrical Engineering Southern Methodist University Dallas TX 75275 Nokia Research Center 6000 Connection Dr. Irving TX 75039 Media Arts and Technology Program Electrical and Computer Engineering University of California Santa Barbara Santa Barbara CA 93106-6065

ISBN: (纸本)0780379381

In MEMO systems, where multiple antennas are used at both transmitter and receiver to achieve high spectral efficiency, channel impulse reponses are often assumed to be constant over a block or packet This assumption of block stationarity on channels is valid for most fixed wireless scenarios. However, for communications in a high mobility environment, the assumption will result in considerable performance degradation. In this paper, we focus on channel estimation for a MIMO system with OFDM transmission technique. In our system, pilots are placed on NP subcarriers for a novel channel estimation at the receiver with Kalman filters. With the channels estimated by a Kalman filter, we apply the QRD-M algorithm for suboptimal data detection with reasonable computational cost The outputs of data detection are fed back to another Kalman filter for an improved channel estimation. By alternatively and iteratively using these two Kalman filters, a better channel estimation can be obtained. A simulation result of the bit error rate shows the improvement of 10 dB in SNR with four iterations over non-iteration.

关键词： Orthogonal frequency division multiplexing

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Robust bayesian cameras motion estimation using random sampling

Robust bayesian cameras motion estimation using random sampl...

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2004 International Conference on Image Processing, ICIP 2004

作者： Qian, Gang Chellappa, Rama Zheng, Qinfen Department of Electrical Engineering and Arts Media and Engineering Program Arizona State University Tempe AZ 85287-8706 Center for Automation Research Institute for Advanced Computer Studies University of Maryland College Park MD 20742-3275

In this paper, we propose an algorithm for robust 3D motion estimation of wide baseline cameras from noisy feature correspondences. The posterior probability density function of the camera motion parameters is represented by weighted samples. The algorithm employs a hierarchy coarse-to-fine strategy. First, a coarse prior distribution of camera motion parameters is estimated using the random sample consensus scheme (RANSAC). Based on this estimate, a refined posterior distribution of camera motion parameters can then be obtained through importance sampling. Experimental results using both synthetic and real image sequences indicate the efficacy of the proposed algorithm. ©2004 IEEE.

关键词： Motion estimation

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Application-layer mobility support for streaming real-time media

Application-layer mobility support for streaming real-time m...

引用

IEEE Conference on Wireless Communications and Networking

作者： J. Kristiansson P. Parnes Department of Computer Science & Electrical Engineering Media Technology Luleå University of Technology Lulea Sweden

This paper presents an UDP-based socket extension called the resilient mobile socket (RMS), which provides application-layer mobility support by encapsulating other sockets into a new aggregated socket abstraction. Encapsulated sockets can then be added or removed without disturbing running applications. RMS also provides a method for soft handovers where several encapsulated sockets are used simultaneously during a handover. As a proof of concept, a working prototype has been built by integrating RMS with Marratech Pro, a commercially available e-meeting application. This prototype has been used to evaluate RMS and to investigate how GSM audio quality is affected by handovers. The result from the investigation shows that soft handovers can be executed without loosing packets or causing extra latency, while a hard handover in average took around 200 ms to complete. This indicates that proactive handovers and redundancy are important, but that more work must he done to predict disconnections.

关键词： Streaming media Sockets Prototypes Delay computer science Mobile computing GSM Land mobile radio cellular systems Internet telephony Mobile communication

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Eventcasting with a wearable computer

Eventcasting with a wearable computer

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International Conference on Distributed Computing Systems Workshop

作者： M. Drugge M. Nilsson K. Synnes P. Parnes Department of Computer Science & Electrical Engineering Division of Media Technology Luleå University of Technology Lulea Sweden

Traditionally, interaction methods for wearable computers have focused on input to the computer itself, yet little has been done when it comes to allowing interaction with the surrounding environment. Pervasive computing, on the other hand, offers access to computational power from any place all the time, yet most interaction techniques utilize either physical hardware or monitoring of the user in order to receive input. This paper presents a novel form of interaction by which a wearable computer user can interact with and control a pervasive computing environment in a natural and intuitive manner. Using sensors, the user can be allowed to literally "throw" events into the environment as a way of interacting with devices and computers.

关键词： Wearable computers Pervasive computing Pharmaceutical technology Hardware Wearable sensors Humans computer science Power engineering computing Physics computing computerized monitoring

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Methods for interrupting a wearable computer user

Methods for interrupting a wearable computer user

引用

International Symposium on Wearable computers

作者： M. Drugge M. Nilsson U. Liljedahl K. Synnes P. Parnes Department of Computer Science & Electrical Engineering Division of Media Technology Luleå University of Technology Lulea Sweden Department of Computer Science & Electrical Engineering Division of Computer Science and Networking Luleå University of Technology Lulea Sweden

A wearable computer equipped with a head-mounted display allows its user to receive notifications and advice that is readily visible in her field of view. While needless interruption of the user should be avoided, there are times when the information is of such importance that it must demand the user's attention. As the user is mobile and likely interacts with the real world when these situations occur, it is important to know in what way the user can be notified without increasing her cognitive workload more than necessary. To investigate ways of presenting information without increasing the cognitive workload of the recipient, an experiment was performed testing different approaches. The experiment described in this paper is based on an existing study of interruption of people in human-computer interaction, but our focus is instead on finding out how this applies to wearable computer users engaged in real world tasks.

关键词： Wearable computers Pharmaceutical technology computer science Pervasive computing computer displays Performance evaluation Testing computer networks Fires Interference

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The correlation between NDVI value and surface temperature measured by aster 20

The correlation between NDVI value and surface temperature m...

引用

20th ISPRS Congress on Technical Commission VII

作者： Takemata, K. Kawata, Y. Naoe, N. Div. of Practical Engineering Education Kanazawa Institute of Technology Nonoichi Ishikawa921-8501 Japan Dept. of Media Informatics Kanazawa Institute of Technology Nonoichi Ishikawa921-8501 Japan Dept. of Electrical and Computer Engineering Kanazawa Technical College Kanazawa Ishikawa921-8601 Japan

The thermal environment in urban areas is characterized by the heat island phenomenon. To estimate the thermal conditions of land surfaces by satellite, it is necessary to find the relationship between the surface temperature and land cover type. The most widely used vegetation index for ecological application is the Normalized Difference Vegetation Index (NDVI). We studied the correlation between NDVI values and the surface temperature in our study area. NDVI uses radiance values or apparent reflectance values of the red and the near-infrared spectral bands. These reflectance values are influenced by the atmospheric aerosols. In order to calculate accurate NDVI values (aerosol-free NDVI), we first estimated the surface reflectance at visible bands by using our atmosphere-ground surface system based on the aerosol observation data. At the test site, we measured the aerosol optical thickness of visible bands using a sky radiometer, and we measured the air temperature and humidity by using a thermometer-hygrometer with a data logger. In this paper, we show the variations of aerosol optical thickness in the spring and summer and demonstrate the correlation between the surface temperatures of ASTER level 2B products and our observed screen temperatures.

关键词： Surface temperature

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