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检索条件"主题词=Change Detection Algorithms"

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Robust 2D shape estimation of moving objects considering spatial and temporal coherency in one MAP detection rule

Robust 2D shape estimation of moving objects considering spa...

引用

IEEE International Conference on Image Processing

作者： R. Mech Institut fuer Theoretische Nachrichtentechnik and Informationsverarbeitung Universitaet Hannover Hanover Germany

ISBN: (纸本)0780362977

An algorithm for 2D shape estimation of moving objects is proposed, which reduces the estimation error compared to the ISO/MPEG-4 reference. The improvement is achieved by four approaches: firstly, the memory for object masks is motion compensated. Secondly, the robustness against camera noise is enhanced due to averaging the noise in succeeding frames. Thirdly, several steps of the algorithm are combined in one MAP detection rule, which leads to spatially more accurate and temporally more coherent object masks. Fourthly, the consideration of results from a colour segmentation is moved to a more suitable position in the algorithm, in order to avoid estimation errors at object boundaries.

关键词： Shape Cameras Estimation error Object detection Noise robustness Noise shaping Layout change detection algorithms Colored noise Databases

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Convergenge of an optimal channel estimation algorithm for DS-CDMA systems in time-varying channels with strong interference

Convergenge of an optimal channel estimation algorithm for D...

引用

MILCOM, Military Communications Conference

作者： S. Tsai J.S. Lehnert School of Electrical and Computer Engineering Purdue University West Lafayette IN USA

ISBN: (纸本)0780365216

An optimal algorithm for channel parameter estimation in direct-sequence spread-spectrum (DS-SS) systems with strong interference is examined in this paper. The algorithm is based on the maximum likelihood (ML) criterion and a modification of the extended Kalman filter. The algorithm is shown with an asymptotic analysis to determine the actual channel parameters. A complete implementation of the algorithm is described, and its transient behavior is examined by computer simulations.

关键词： Convergence Channel estimation Multiaccess communication Time-varying channels Parameter estimation Maximum likelihood detection Maximum likelihood estimation Fading change detection algorithms Bit error rate

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Improved fade and dissolve detection for reliable video segmentation

Improved fade and dissolve detection for reliable video segm...

引用

IEEE International Conference on Image Processing

作者： B.T. Truong C. Dorai S. Venkatesh Department of Computer Science Curtin University of Technology Perth Australia IBM Thomas J. Watson Research Center NY USA

We present improved algorithms for automatic fade and dissolve detection in digital video analysis. We devise new two-step algorithms for fade and dissolve detection and introduce a method for eliminating false positives from a list of detected candidate transitions. In our detailed study of these gradual shot transitions, our objective has been to accurately classify the type of transitions (fade-in, fade-out, and dissolve) and to precisely locate the boundary of the transitions. This distinguishes our work from early work in scene change detection which focuses on identifying the existence of a transition rather than its precise temporal extent. We evaluate our algorithms against two other commonly used methods on a comprehensive data set, and demonstrate the improved performance due to our enhancements.

关键词： Gunshot detection systems Production Video compression Mood Robustness Algorithm design and analysis Layout change detection algorithms Image segmentation Performance analysis

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A singular values and singular vectors based blind multiuser detector

A singular values and singular vectors based blind multiuser...

引用

International Conference on Communication Technology (ICCT)

作者： Yang Heng Zhang Xianda State Key Laboratory of Intelligent Technology and System Department of Automation Tsinghua University Beijing China

A singular values and singular vectors blind multiuser detector is proposed in this paper. This detector uses singular values and singular vectors of signal subspace to get a linear MMSE multiuser detector for a DS-CDMA system. This method uses FAST (fast approximate subspace tracking) algorithm to estimate singular values and singular vectors. The multiuser detector proposed in this paper can converge quickly and its output can achieve high SNR.

关键词： Detectors Vectors Multiuser detection change detection algorithms Multiaccess communication Bit error rate Spread spectrum communication Gaussian noise Additive white noise Laboratories

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Enhanced binary tree genetic algorithm for automatic land cover classification

Enhanced binary tree genetic algorithm for automatic land co...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： K. Palaniappan Feng Zhu Xinhua Zhuang Yunxin Zhao A. Blanchard Department of Computer Engineering and Computer Science Multimedia Communication and Visualization Laboratory USA Department of Electrical Engineering University of Missouri Columbia MO USA

The development of automatic land cover classification maps using validated statewide datasets supported by state and federal agencies are becoming an important tool for monitoring change, planning, and land use impact assessment. Accurate and fast classification algorithms, adaptive to different data sources and scales, will facilitate cost effective routine updating of land cover maps using current satellite imagery to monitor and detect a broad array of land cover phenomena. A new binary decision tree classifier incorporating an evolutionary genetic learning algorithm is proposed for land cover classification. The new classifier referred to as the Enhanced Binary Tree Genetic Algorithm (BTGA+) has been applied to automatically classify tens of millions of pixels in two full scenes of Landsat TM data using multispectral multitemporal radiance features. The BTGA+ classifier can assign pixels into eight land cover categories for Landsat TM scenes in central Missouri with nearly 90% classification accuracy.

关键词： Binary trees Genetic algorithms Classification tree analysis Satellites Layout Remote sensing Computerized monitoring Land use planning change detection algorithms Classification algorithms

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A client-server oriented algorithm for virtually synchronous group membership in WANs

A client-server oriented algorithm for virtually synchronous...

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International Conference on Distributed Computing Systems

作者： I. Keidar J. Sussman K. Marzullo D. Dolev Lab for Computer Science Massachusetts Institute of Technology Department of Computer Science and Engineering University of California San Diego USA Computer Science Institute Hebrew University of Jerusalem Israel

We describe a novel scalable group membership service designed explicitly for wide area networks. Our membership service is scalable in the number of groups supported, in the number of members in each group, and in the topology each group spans. Our service also supplies the hooks needed to provide clients with full virtual synchrony semantics. Our service attains, on average, a low message overhead by agreeing on membership within a single message round. Furthermore, our service avoids notifying the application of obsolete membership views when the network is unstable, yet it converges when the network has stabilized.

关键词： Wide area networks Computer science change detection algorithms Design engineering Algorithm design and analysis Network topology Interleaved codes Contracts Fault tolerant systems Maintenance

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Videoabstract: a hybrid approach to generate semantically meaningful video summaries

Videoabstract: a hybrid approach to generate semantically me...

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： C. Toklu S.-P. Liou M. Das Multimedia & Video Technology Department Siemens Corporate Research Inc. Princeton NJ USA Department of Computer Science University of Massachusetts Amherst MA USA

Video summarization is a key component in providing Internet users a way to quickly browse a video clip in different levels of detail, without the need to view the entire video clip. We present a hybrid approach to video summary generation, which automatically process the video, creating a multimedia video summary, while providing easy-to-use interfaces for verification, correction, and augmentation of the automatically generated story segments and extracted multimedia content. algorithms are developed to solve the sub-problems of story segmentation, story boundary refinement, and video summary generation. The use of automatic processing in conjunction with input from the user allows a user to produce meaningful video summaries efficiently.

关键词： Hybrid power systems Video compression User interfaces Data mining Image segmentation change detection algorithms Educational institutions Internet Automatic speech recognition Natural languages

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Iterative estimation of Antarctic sea ice extent using SeaWinds data

Iterative estimation of Antarctic sea ice extent using SeaWi...

引用

IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Q.P. Remund D.G. Long MERS Laboratory Brigham Young University Provo UT USA

Polar sea ice extent is an important input to global climate models and is considered to be a sensitive indicator of climate change. An algorithm has previously been developed for sea ice extent detection using data from the NASA scatterometer (NSCAT). This paper discusses the extension of that algorithm to data from SeaWinds on QuikSCAT. Due to differences in the two instruments, several modifications to the algorithm are needed for adaptation to SeaWinds data. Enhanced resolution, reconstructed SeaWinds imagery is generated using the scatterometer image reconstruction (SIR) algorithm. Images of the modified polarization ratio, h-pol /spl sigma//sup 0/, and the hand v-pol /spl sigma//sup 0/ estimate error standard deviations are used in the discrimination. An iterative maximum likelihood classifier is developed to segment sea ice and open ocean pixels. Residual classification errors are reduced through binary image processing techniques. The resulting ice extent estimates are highly correlated with the NASA Team algorithm 30% ice concentration edges derived from SSM/I data.

关键词： Antarctica Sea ice change detection algorithms Iterative algorithms NASA Radar measurements Image reconstruction Instruments Image resolution Image generation

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Robust vehicle detection at large distance using low resolution cameras

Robust vehicle detection at large distance using low resolut...

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IEEE Symposium on Intelligent Vehicle

作者： C. Knoeppel A. Schanz B. Michaelis Research Institute DaimlerChrysler Aerospace Esslingen Germany Faculty of Electrical Engineering Otto-von-Guericke University of Magdeburg Magdeburg Germany

This paper describes a robust vehicle detection system which detects vehicles in the rear view of the host car. Two cameras with 12 mm focal length mounted behind the back pane are used. Reliable vehicle recognition up to 150 m and the exact track localization of the vehicles are the key features of the system. The robust stereo algorithm generates object hypotheses which are tracked with Kalman filter. Using the steering angle and the detected obstacles, the driven way of the host vehicle is reconstructed. This information is used for a lane change assistant.

关键词： Robustness Vehicle detection Cameras Vehicles Vehicle driving Radar tracking change detection algorithms Radar detection Object recognition Object detection

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Multiuser detection of FH/MFSK system combined with soft limiter

Multiuser detection of FH/MFSK system combined with soft lim...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Yu-Chang Eun Jang-Wook Moon Hong-Yeop Song School of Electrical and Computer Engineering Yonsei University Seoul South Korea

We propose a simple modification on Fiebig's (see Proc. of the IEEE ICC'96, p. 0-95, 1996) REC algorithm for multiuser detection of FH/MFSK systems replacing hard limiter with soft limiter. The performance improvement of our modified REC algorithm has been confirmed with simulations. For the parameter of interest, the capacity can be increased about 5% or more without degrading the reliability.

关键词： Multiuser detection Maximum likelihood decoding Frequency shift keying change detection algorithms Rayleigh channels Interference cancellation Iterative algorithms Moon Degradation Spread spectrum communication

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