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检索条件"主题词=change detection algorithms"

共 1588 条记录，以下是661-670 订阅

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Pattern matching by sequential subdivision of transformation space

Pattern matching by sequential subdivision of transformation...

引用

International Conference on Pattern Recognition

作者： Mingtian Ni S.E. Reichenbach Department of Computer Science and Engineering University of Nebraska Lincoln Lincolnshire NE USA

ISBN: (纸本)0769521282

Pattern matching is a well-known pattern recognition technique. This paper proposes a novel pattern matching algorithm that searches transformation space by sequential subdivision. The algorithm subdivides the transformation space in depth-first manner by conducting Boolean operations on the constraint sets that are defined by pairs of template points and target points. For constrained polynomial transformations that have no more than two parameters on each coordinate, a constraint set can be represented as a 2D polygon or a Cartesian product of 2D polygons. Then, the Boolean operations can be computed through generic polygon clipping algorithms. Preliminary experiments on randomly generated point patterns show that the algorithm is effective and efficient under practical conditions.

关键词： Pattern matching Pattern recognition change detection algorithms Polynomials Computational complexity Computer science Fusion power generation Object detection Space exploration Personal communication networks

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Security-Monitoring using Microphone Arrays and Audio Classification

Security-Monitoring using Microphone Arrays and Audio Classi...

引用

IEEE Instrumentation and Measurement Technology Conference

作者： A.R. Abu-El-Quran R.A. Goubran Department of Systems and Computer Engineering Carleton University Ottawa ONT Canada

This paper proposes a security-monitoring instrument that can detect and classify the location and nature of different sounds in a room. The instrument is reliable and robust even in the presence of reverberation and in low signal to noise ratio conditions. This paper proposes a new algorithm for classifying first an audio segment as speech or nonspeech then classifies the nonspeech audio segment into its own audio type. The algorithm divides an audio segment into frames, estimates the presence of pitch in each frame, and calculates a pitch ratio parameter. This parameter is then used to classify the audio segment. The threshold used in calculating this parameter is adapted to accommodate different environments. Nonspeech audio segment has further classification using time delayed neural network to be classified into it is own type. The performance of the proposed algorithm is evaluated for different signal-to-noise ratios using a library of audio segments. The library includes speech segments and nonspeech segments such as windows breaking and footsteps. Using 0.4 second segments it is shown that the proposed algorithm can achieve an average correct decision for 94.5% of the reverberant library and 95.1% of the nonreverberant library

关键词： Microphone arrays Feature extraction Acoustic noise Instruments Reverberation Speech Libraries Working environment noise Noise cancellation change detection algorithms

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A simple real-time QRS detection algorithm

A simple real-time QRS detection algorithm

引用

Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Jeongwhan Lee Keesam Jeong Jiyoung Yoon Myoungho Lee Department of Electrical Engineering Yonsei University Seoul South Korea

A simple algorithm using topological mapping has been developed for a real-time detection of the QRS complexes of ECG signals. As a measure of QRS complex energy, the authors used topological mapping from one dimensional sampled ECG signals to two dimensional vectors. To describe a change of curvature, the authors derive modified spatial velocity (MSV), from MSV the authors can locate QRS complexes more easily. The proposed algorithm consists of very small C-language procedures which reliably recognize the QRS complexes. For evaluation the authors used the MIT/BIH arrhythmia database. The proposed algorithm provides a good performance, a 99.58% detection rate of QRS complexes, a 99.57% sensitivity and 99.87% positive predictivity, respectively.

关键词： detection algorithms Electrocardiography Chaos change detection algorithms Delay effects Signal mapping Physics Nonlinear dynamical systems Energy measurement Databases

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Redundant manipulators motion through singularities based on modified Jacobian method

Redundant manipulators motion through singularities based on...

引用

International Workshop on Robot Motion and Control (RoMoCo)

作者： I. Duleba J.Z. Sasiadek Institute of Engineering Cybernetics Wroclaw University of Technology Wroclaw Poland Department of Mechanical and AeroSpace Engineering Carleton University Ottawa Canada

This paper presents a method which allows one to pass transversally through singularities of corank 1 for redundant manipulators. The method modifies a Jacobian matrix of the manipulator's forward kinematics to retrieve its full rank at singularities. The method is computationally inexpensive and conceptually simple. It is well suited for real time control and practical implementations. The method is illustrated with the example of a 3-link planar pendulum.

关键词： Jacobian matrices Kinematics change detection algorithms Orbital robotics Robustness Trajectory Cybernetics Transmission line matrix methods Inverse problems Robot motion

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A Novel Algorithm for Background Updating and Target Tracking

A Novel Algorithm for Background Updating and Target Trackin...

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International Symposium on Computer Science and Computational Technology, ISCSCT

作者： Hui-zhong Zhuang Han Li Mechanical & Electrical Engineering Department Vocational Technical College Shanghai University Engineering of Science Shanghai China Electronic Information Department Physics and Electronic Information College Wenzhou University Wenzhou Zhejiang China

A novel algorithm of three-layer probability model based on synchronous detection lines is proposed to solve the problems of background updating and target tracking. Firstly, the state of each pixel point on the same synchronous detection line is judged in the probability model of pixel points. Secondly, the state of each synchronous detection line is estimated by maximum likelihood estimation so that the problem of background updating can be solved. Thirdly, the problem of target tracking is solved by the state distribution of the synchronous detection line. Finally, the coordination and shadow problems for multiple detection region groups are also discussed in this paper. The results of a practical system are shown that this algorithm has better effect to solve the problems of background updating and target tracking.

关键词： Target tracking Gaussian distribution Educational institutions Pixel Switches Data mining Motion detection Layout change detection algorithms Computer science

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Reverse-engineering of communication protocols

Reverse-engineering of communication protocols

引用

International Conference on Network Protocols

作者： D. Lee K. Sabnani AT and T Bell Laboratories Inc. Murray Hill NJ USA

The authors study the problem of locating the differences between a protocol specification and its implementation. They give an exact procedure for solving this problem. If there is only one difference between the implementation and the specification, then the algorithm will locate the difference and therefore identify the implementation machine. Otherwise, it will detect that the implementation machine has more than one change. The run time of the algorithm is a low-degree polynomial in the number of states and inputs of the machine. Both a brute-force version of the algorithm with a cost O(pn/sup 5/), where n is the number of states of the specification machine and p is the number of inputs, and a fast algorithm with a cost O(pn/sup 3/ log n) are described. An improvement for which the cost on the average is O(pn/sup 2/ log n) is also given. A heuristic procedure that uses a test of comparable length to a conformance test sequence which has been used successfully in practice is described.< >

关键词： Protocols Costs change detection algorithms Polynomials Automata Automatic testing Computer industry Computer aided manufacturing Formal specifications Condition monitoring

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Dynamic Spectrum Access in Non-Stationary Environments: A Thompson Sampling Based Method

Dynamic Spectrum Access in Non-Stationary Environments: A Th...

引用

GLOBECOM 2022 - 2022 IEEE Global Communications Conference

作者： Shuai Ye Tianyu Wang Shaowei Wang School of Electronic Science and Engineering Nanjing University Nanjing China

ISBN: (纸本)9781665435413

In dynamic spectrum access (DSA), unlicensed secondary users can estimate the idle probability of each primary channel by using historical sensing results and access the channel with the highest idle probability for opportunistic transmission. Most of the existing works assume that each primary channel is associated with a constant idle probability, which can be accurately estimated by sensing the channel multiple times. However, due to the rapid traffic change and irregular user mobility, primary channels can be highly dynamic and the associated idle probability is generally time-varying. In this paper, we consider DSA in non-stationary environments where the idle probabilities of primary channels vary with time. Specifically, we propose a DSA scheme based on the Thompson sampling method with a change-detection technique, which is capable of detecting the variation of channel statistics and adjusting the channel access strategy accordingly. Numerical results show that the proposed algorithm outperforms the existing algorithms in terms of successful transmission ratio in various settings.

关键词： change detection algorithms Heuristic algorithms Channel estimation Dynamic spectrum access Probability Sampling methods Sensors

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Reliable detection of faults in navigation systems

Reliable detection of faults in navigation systems

引用

IEEE Conference on Decision and Control

作者： B. Bakhache I. Nikiforov Laboratoire de Modlisation et Sňreté des Systémes Surete des Systemes Université de Technologie de Troyes Troyes France Laboratoire de Modlisation et Sureté des Systémes Surete des Systemes Université de Technologie de Troyes Troyes France

This paper presents some special aspects of fault detection in measurement systems. A new performance criterion and two suboptimal change detection algorithms are considered. The application of these algorithms to the... 详细信息

ISBN: (纸本)0780352513

关键词： Fault detection Navigation Delay effects Global Positioning System Monitoring detection algorithms change detection algorithms Stochastic processes Random sequences Stochastic systems

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An OSPF based load sensitive QoS routing algorithm using alternate paths

An OSPF based load sensitive QoS routing algorithm using alt...

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International Conference on Computer Communications and Networks (ICCCN)

作者： A. Sahoo Milpitas CA USA

Real-time applications such as Voice over IP, audio and video streaming require quality of service (QoS). Such applications are being executed over the public Internet. Since today's Internet largely supports best effort traffic, QoS routing in the best effort environment is required to support real-time applications. Some QoS routing uses source routing and others use flooding of some QoS attributes of the nodes. There were also some variants of the shortest path algorithm reported in the literature. But those algorithms require changes to the packet forwarding engine and logic for loop detection. We believe a better way of implementing QoS routing is to localize the QoS routing changes to the region where QoS has deteriorated and choose loop-free alternate paths. We present such an algorithm based on OSPF (open shortest path first) called the LSR algorithm. In the LSR algorithm, congestion notification is limited to neighbors of the congested node and the neighbors try to use alternate next hops to route packets. Alternate LSR next hop is chosen in such a way that it preserves the next hop property of OSPF routing which enables the LSR algorithm to avoid a loop. We present three such methods to choose an alternate LSR next hop and prove that these methods provide loop-free routing. Our simulation results based on the three methods show that on average the LSR algorithm performs better than the OSPF algorithm in terms of delay and jitter.

关键词： Routing Quality of service Internet telephony Web and internet services IP networks Costs change detection algorithms Streaming media Floods Search engines

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Automatic radionuclide lung scan registration: a comparison of four methods

Automatic radionuclide lung scan registration: a comparison ...

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IEEE Symposium on Nuclear Science (NSS/MIC)

作者： SuChin Chen Coutre M.W. Evens S.G. Armato R. Orlandic Department of Computer Science Illinois Institute of Technology Chicago IL USA Department of Radiology University of Chicago Chicago IL USA

Most current image registration methods require some degree of user interaction. The present study investigates four fully automated methods to register radionuclide ventilation and perfusion (V/Q) lung scan images. The database of 34 clinical lung scans included a range of normal and abnormal images. Each V/Q scan was used to create a V/Q composite image, which is a superimposition of the registered ventilation and perfusion images, Color-enhanced V/Q composite images facilitate measurement of V/Q ratios, identification of ventilation or perfusion defects, and detection of temporal change and may assist in patient diagnosis and therapy planning. We present four algorithms: one-dimensional V/Q automatic registration method (VQARM), center-of-object registration (COO), two-dimensional linear Pearson correlation with background subtraction (2DLPC), and conditional entropy registration (CE). Each algorithm will be described in detail, and the relative performances will be compared.

关键词： Lungs Ventilation Image registration Q measurement change detection algorithms Blood flow Performance evaluation Computer science Radiology Registers

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