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检索条件"主题词=detection algorithms"

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Performance study of digital pacer spike detection as sampling rate changes

Performance study of digital pacer spike detection as sampli...

引用

Computers in Cardiology (CinC)

作者： S. Luo P. Johnston W. Hong Cardiac Science Corporation Deerfield WI USA

In this study, we first collected ECG data at 32 ksps and 500 sps from 51 patients with an implanted cardiac pacemaker. We also included 16 non paced ECGs with severe motion artifact and static interference. We then annotated the pacer pulses (locations and classifications) using special viewing software and divided the data into training and testing sets. We developed three digital pacemaker stimulus detection algorithms, one for each of three different sampling rates (500 sps, 8 ksps, and 32 ksps) by using similar detection concepts. After tuning them on the training sets at the corresponding sampling rates, we investigated their performances. Results showed that the detection algorithm based on the 12-lead 500-sps data stream has a good performance (sensitivity or Se=77.51%; positive productive value, or +P=90.32%). The 8-ksps detector has a better performance (Se=95.37; +P=99.77). The digital pacemaker detection algorithm for 32 ksps or higher data provided almost 100% true pacer spike detection (Se=99.51 and +P=100%). In summary, high speed sampling at 32 ksps can provide accurate detection of modern pacers and leads to a significant improvement in detection of pacemaker stimuli compared to the reduced sampling rates used previously.

关键词： Sampling methods Pacemakers Electrocardiography detection algorithms Interference Detectors Software testing Data acquisition Streaming media Clothing

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Noise Robust Pitch detection Based on Extended AMDF

Noise Robust Pitch Detection Based on Extended AMDF

引用

IEEE International Symposium on Signal Processing and Information Technology (ISSPIT)

作者： Ghulam Muhammad Department of Computer Engineering College of Computer and Information Sciences King Saud University Riyadh Saudi Arabia

This paper introduces a new extended average magnitude difference function (EAMDF) for noise robust pitch detection. EAMDF involves in sufficient number of averaging for all lag values compared to the original AMDF, and thereby eliminates the falling tendency of the AMDF without emphasizing pitch harmonics at higher lags, which is a severe limitation of other existing improvements of the AMDF. A noise robust post processing that explores the contribution of each frequency channel is also presented. Experimental results on Keele pitch database in different noise level shows the superiority of the proposed EAMDF based pitch detection method over other methods based on AMDF.

关键词： Noise robustness Power harmonic filters Speech Frequency detection algorithms Signal to noise ratio Educational institutions Databases Noise level Smoothing methods

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Randomized Trees for Human Pose detection

Randomized Trees for Human Pose Detection

引用

26th IEEE Conference on Computer Vision and Pattern Recognition (CVPR 2008), vol.7

作者： Gregory Rogez Jonathan Rihan Srikumar Ramalingam Carlos Orrite Philip H. S. Torr Computer Vision Lab-I3A University of Zaragoza Spain Department of Computing Oxford Brookes University UK

This paper addresses human pose recognition from video sequences by formulating it as a classification problem. Unlike much previous work we do not make any assumptions on the availability of clean segmentation. The first step of this work consists in a novel method of aligning the training images using 3D Mocap data. Next we define classes by discretizing a 2D manifold whose two dimensions are camera viewpoint and actions. Our main contribution is a pose detection algorithm based on random forests. A bottom-up approach is followed to build a decision tree by recursively clustering and merging the classes at each level. For each node of the decision tree we build a list of potentially discriminative features using the alignment of training images;in this paper we consider Histograms of Orientated Gradient (HOG). We finally grow an ensemble of trees by randomly sampling one of the selected HOG blocks at each node. Our proposed approach gives promising results with both fixed and moving cameras.

关键词： Humans Computer vision Cameras detection algorithms Decision trees Histograms Detectors Shape Motion detection Video sequences

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Alert detection in System Logs

Alert Detection in System Logs

引用

IEEE International Conference on Data Mining (ICDM)

作者： Adam J. Oliner Alex Aiken Jon Stearley University of Stanford Stanford CA USA Sandia National Laboratories Albuquerque NM USA

We present Nodeinfo, an unsupervised algorithm for anomaly detection in system logs. We demonstrate Nodeinfo's effectiveness on data from four of the world's most powerful supercomputers: using logs representing over 746 million processor-hours, in which anomalous events called alerts were manually tagged for scoring, we aim to automatically identify the regions of the log containing those alerts. We formalize the alert detection task in these terms, describe how Nodeinfo uses the information entropy of message terms to identify alerts, and present an online version of this algorithm, which is now in production use. This is the first work to investigate alert detection on (several) publicly-available supercomputer system logs, thereby providing a reproducible performance baseline.

关键词： Supercomputers Data mining USA Councils Information entropy Laboratories Production systems Costs detection algorithms Personnel Fault detection

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Hardware Efficient Skip Mode detection for H.264/AVC

Hardware Efficient Skip Mode Detection for H.264/AVC

引用

IEEE International Conference on Consumer Electronics (ICCE)

作者： Chia-Chun Lin Yu-Kun Lin Tian-Sheuan Chang Institute of Electronics National Chiao Tung University Taiwan

The paper presents a low cost skip detection algorithm and its architecture by detecting 4x4-zero block numbers in a macroblock (MB). With this simple detection mechanism and an adaptive threshold; the proposed algorithm can correctly pre-skip 82.62% of total MB encoding, and save up to 82.8% encoding time and corresponding computing power whereas maintains similar video quality because of the high accuracy prediction. Moreover, the design only occupies 0.63K gate counts so that it can be easily combined with the H.264 encoder implementation without overhead for low power and low complexity.

关键词： Hardware Automatic voltage control Encoding Entropy coding Costs Video coding Motion estimation detection algorithms Computer architecture Accuracy

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Anomaly detection by combining decision trees and parametric densities

Anomaly detection by combining decision trees and parametric...

引用

International Conference on Pattern Recognition

作者： Matthias Reif Markus Goldstein Armin Stahl Thomas M. Breuel German Research Center for Artificial Intelligence Department of Computer Science Technical University of Kaiserslautern

ISBN: (纸本)9781424421749

In this paper a modified decision tree algorithm for anomaly detection is presented. During the tree building process, densities for the outlier class are used directly in the split point determination algorithm. No artificial counter-examples have to be sampled from the unknown class, which yields to more precise decision boundaries and a deterministic classification result. Furthermore, the prior of the outlier class can be used to adjust the sensitivity of the anomaly detector. The proposed method combines the advantages of classification trees with the benefit of a more accurate representation of the outliers. For evaluation, we compare our approach with other state-of-the-art anomaly detection algorithms on four standard data sets including the KDD-Cup 99. The results show that the proposed method performs as well as more complex approaches and is even superior on three out of four data sets.

关键词： Decision trees Impurities Classification tree analysis Intrusion detection Training data Sampling methods Artificial intelligence Computer science Detectors detection algorithms

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detection Algorithm for Hybrid Space-Time and Spatial Multiplexing Wireless Communications Systems

Detection Algorithm for Hybrid Space-Time and Spatial Multip...

引用

International Conference on Electronics, Communications and Computers (CONIELECOMP)

作者： Joaquín Cortez Miguel Bazdresch Deni Torres Ramón Parra ITSON University Cd. Obregón México ITESO University Guadalajara México CINVESTAV Zapopan Mexico CINVESTAV-GDL Zapopan México

In this paper we propose a new architecture for detection of hybrid layered space-time block codes (LSTBC). The proposed receiver is based on a successive interference cancellation (SIC) scheme and the QR decomposition, which leads to a suitable hardware implementation. It was designed for zero-forcing (ZF) criterion; reduced complexity is achieved by means of an adequate rearrangement of the channel matrix elements. Simulation results show that this new architecture outperforms similar, recently reported detectors in terms of bit error rate under spatially correlated channels.

关键词： detection algorithms Wireless communication Transmitters MIMO Receiving antennas Transmitting antennas Block codes Matrix decomposition Space time codes Computer architecture

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Research on detection Algorithm of Multi-Class Telephone Signal Tones

Research on Detection Algorithm of Multi-Class Telephone Sig...

引用

2008 International Conference on Audio，Language and Image Processing(2008国际声音、语言、图像过程大会)

作者： Shan Zhong Weiqiang Zhang Jia Liu Department of Electronic Engineering Tsinghua University Beijing 100084 China

This paper not only proposes the detection algorithm of traditional ring signal tones, but also researches the Color Ring Back Tone which is well popular recent years. Different testing methods are given according to the difference of music color ring tone and voice prompt color ring tone. Tested on RMTS (Real-world Multi-channel Telephone Speech) database, experiments show that the detection rates of ring tone, music color ring tone, voice prompt color ring tone and virtual speech reach 100%, 98.5%, 98% and 97.5% respectively, 98.5% totally.

关键词： Music Speech Training detection algorithms Color Testing Speech recognition

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BDD based detection algorithm for XOR-type logic

BDD based detection algorithm for XOR-type logic

引用

International Conference on Communication Technology (ICCT)

作者： Fei Sun Yinshui Xia Institute of Circuits and Systems Ningbo University Zhejiang China

Based on the characteristics study of binary decision diagrams (BDDs) of logic functions, a method using the characteristic triangle (CT) to detect logic functions suitable for XOR logic implementation is presented and a corresponding algorithm is developed. The proposed algorithm is implemented in C and tested on MCNC benchmarks. The experimental results show that the proposed algorithm is efficient compared with published results.

关键词： Binary decision diagrams detection algorithms Boolean functions Logic functions Data structures Logic circuits Reactive power Logic design Sun Circuits and systems

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An optimal automatic beat detection algorithm based on detector switching

An optimal automatic beat detection algorithm based on detec...

引用

Computers in Cardiology (CinC)

作者： P. Tchuidjang C. Corsi J. De Bie DEIS University of Bologna Cesena Italy Mortara Rangoni Europe srl Bologna Italy

In this paper we present an innovative approach to improve the performance of beat detection in the presence of a significant level of noise on some ECG leads in a setting of multi-lead acquisition. The idea is to run simultaneously two detectors (ldquoprincipalrdquo and ldquosparerdquo) and to dynamically switch between them according to the level of noise on the leads used by the detectors. First, default independent leads are assigned to the detectors; then, a bootstrap phase is necessary during which average QRS amplitudes are established for all leads. Based on the independence of the leads and the QRS amplitudes best leads are automatically computed and assigned to the detectors. After the bootstrap phase, the algorithm calculates the noise level of the leads used by both detectors every 500 ms and switches to the spare detector if the noise in the principal detector leads exceeds a threshold (T). The performance of the algorithm was tested on a database created for the purpose; the database contains 101 1-hour 12-lead Holter records selected from 24-hour recordings with a commercial analysis system on the basis of the amount of artifact. The performance of the algorithm was tested for various values of T and noise observation windows. A QRS sensitivity of 99.7 %, a QRS positive predictive value of 99.3 %, a ventricular sensitivity of 91.0 % and a ventricular positive predictive value of 55.3 % have been achieved.

关键词： detection algorithms Detectors Noise level Phase detection Switches Databases Electrocardiography Phase noise System testing Performance analysis

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