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检索条件"主题词=change detection algorithms"

共 1588 条记录，以下是781-790 订阅

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Adaptive Segmentation Technique For Object-Base MPEG-4 System

Adaptive Segmentation Technique For Object-Base MPEG-4 Syste...

引用

NASA/ESA Conference on Adaptive Hardware and Systems (AHS)

作者： Shih-Chang Hsia Cheng Hung Hsiao Department of Computer and Communication Engineering National Kaohsiung First University of Science and Technology Kaohsiung Taiwan

This paper presents a segmentation application based on change-detection techniques. The algorithm is able to deal with sequences having different amounts of motion by adjusting the number of frames to skip, to reduce the light drift by DC correction and dealing with noise in a locally adaptive manner. An adaptive truncation processing is used to remove background content as well as to discard the background noise to achieve a binary shape. Finally, a boundary smoothing method is used to improve the segmentation quality. The segmented algorithm can pass various sequences testing with acceptable error-ratio. While segmented algorithm applying on MPEG-4 based surveillance systems, the coding efficiency can be greatly promoted as compared to the conventional MPEG-2 coding. The algorithm uses low computational complexity to make it applicable to real-time surveillance systems using software implementation.

关键词： MPEG 4 Standard Surveillance change detection algorithms Noise reduction Noise shaping Background noise Shape Smoothing methods Testing Software algorithms

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Morphological Classification of ST segment using Reference STs Set

Morphological Classification of ST segment using Reference S...

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

作者： Gu-Young Jeong Kee-Ho Yu Division of Mechatronics Engineering Chonbuk National University of Korea Jeonju Jeonbuk South Korea Division of Mechanical and AeroSpace System Engineering Chonbuk National University of Korea Jeonju Jeonbuk South Korea

Morphological change of ECG is the important diagnostic parameter to finding the malfunction of a heart. An abnormal ST segment change especially is a very important for finding myocardial ischemia. Long-term ECG recording is needed because an ST change is transient. Accordingly, physicians try to find the transient change of the ST segment. The aim of this study is to classify ST according to its shape type using a polynomial approximation method and the reference STs set. The developed algorithm consists of feature point detection, ST level detection and ST shape classification. The first step of feature point detection is the detection of QRS complex, and this is accomplished using the morphological characteristics of QRS complex such as the steep slope and high amplitude. The other feature points are also detected using their morphological characteristics. The developed algorithm detects the ST level change, and then classifies the ST shape type using the polynomial approximation. The algorithm finds the least squares curve for the data between S wave and T wave in ECG. This curve is used for the classification of the ST shapes. ST type is classified by comparing the slopes between the reference ST type and the least square curve. We applied the developed algorithm to the ECG data in European ST database. Through the result from the developed algorithm, we can know when the ST level change occurs and what the ST shape type is.

关键词： Sociotechnical systems Shape Electrocardiography change detection algorithms Polynomials Computer vision Least squares methods Heart Myocardium Ischemic pain

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Power Flow Control of a 3-D Wireless Power Pick-Up

Power Flow Control of a 3-D Wireless Power Pick-Up

引用

2nd IEEE Conference on Industrial Electronics and Applications(ICIEA 2007)(第二届IEEE工业电子与应用国际会议)

作者： J.U.HSU A.P.HU P.SI A.SWAIN The University of AucklandNew Zealand

A variable inductor based power flow control method is proposed to regulate the output voltage of a wireless power pick-up. The open circuit voltage variation of the power pick-up is compensated by controlling a magnetic amplifier type inductor in an LCL tuning configuration. The proposed control algorithm directly detects the output voltage of the power pick-up and feedbacks the voltage signal to update the tuning direction truth table discretely. According to the output voltage, the controller determines the direction of the equivalent inductance change of the magnetic amplifier. Both simulation and practical results demonstrated that the proposed control algorithm can effectively maintain the output voltage at a desired value after a short period of transient response. It has been found that the step-size of the variable inductor and sampling time are two key factors governing the control quality. These two parameters were selected based on the tolerance of the output voltage variation and the desired control speed.

关键词： Load flow control Voltage control Magnetic variables control Inductors Circuit optimization change detection algorithms Magnetic circuits Power amplifiers Output feedback Inductance

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A Power-Aware Reconfigurable Rendering Engine Design with 453MPixels/s, 16.4MTriangles/s Performance

A Power-Aware Reconfigurable Rendering Engine Design with 45...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Chih-Hao Chao Yen-Lin Kuo An-Yeu Wu Weber Chien Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan Sitronix Technology Corporation Taipei Taiwan

This paper presents a power-aware dynamically reconfigurable rendering engine design, which changes power as rendering throughput and image quality change. At algorithm level, a precision-aware shading scheme is proposed to improve the power efficiency of the conventional shading algorithm through the combination of precision detection and fraction masking techniques. At architecture level, a processing element (PE) based scalable architecture is combined with dynamic task scheduling and dispatching techniques to raise hardware utilization rate and reduce computation latency. Finally a prototyping design which delivers 453MPixels/s, 16.4MTriangles/s, 2.24MPixel/mJ is presented

关键词： Engines Rendering (computer graphics) change detection algorithms Computer architecture Throughput Image quality Processor scheduling Dynamic scheduling Dispatching Hardware

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Cumulative Sum Charts - A Novel Technique for Processing Daily Time Series of MODIS Data for Burnt Area Mapping in Portugal

Cumulative Sum Charts - A Novel Technique for Processing Dai...

引用

International Workshop on the Analysis of Multi-temporal Remote Sensing Images (MultiTemp)

作者： Jan Kucera Paulo Barbosa Peter Strobl European Commission DG Joint Research Centre Institute for Environment and Sustainability Varese Italy

Portugal has experienced severe forest fires in the recent years. European Commission (EC) requires accurate burned area assessment for Portugal every year. Satellite data from Moderate Resolution Imaging Spectroradiometer (MODIS) were found to be the most appropriate for the task. In this paper we describe an algorithm for burned area mapping in Portugal. The algorithm utilizes daily time series data from both Aqua and Terra for the whole fire season from 1.5.2005 till 31.10.2005. Robust approach to detect land cover change due to the forest fire was developed. Algorithm robustness absorbs the effects of sun-target-satellite viewing geometry, presence of residual clouds, atmospheric effects and missing data. A change due the forest fire is detected and supported by the confidence measures. A validation of the final burned area maps is performed against visual interpretation of single date MODIS scene and Landsat-derived fire maps. The visual interpretation results in 278,490 ha of burned area versus 278,801 ha assessed by the algorithm for whole Portugal. Landsat-derived maps for several big burned patches reveals 61,571 ha while algorithm based measurement results in 59772 ha of the burned forest. For its high reliability, the extension of usage of the algorithm for the whole Mediterranean area of European Union is under investigation.

关键词： MODIS Fires Satellites change detection algorithms Robustness Remote sensing Geometry Clouds Atmospheric measurements Layout

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Robust Dissolve detection Using Local Feature Tracking

Robust Dissolve Detection Using Local Feature Tracking

引用

IEEE Workshop on Applications of Computer Vision (WACV)

作者： San Ko J. G. Jeong S. K. Kim J. Y. Kim Samsung Advanced Institute of Technology Yongin si Gyeonggi South Korea

In this paper we propose a novel dissolve detection algorithm which overcomes the defects of previously suggested algorithms. Differentiating dissolve from the effect aroused by camera motion or objects movement has long been a problem irritating the researchers and not settled thoroughly yet. In our approach, feature points are tracked so that inter-frame comparison can be executed between the exactly corresponding local features. This method reduces the false alarm caused by motions and improves the acuity of inter-frame comparison greatly. The experimental result shows the superiority of local feature comparison method to that of global feature

关键词： Robustness Computer vision Histograms Cameras Gunshot detection systems Spatiotemporal phenomena change detection algorithms Shape Rhythm detection algorithms

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Development of ambulatory ECG monitoring device with ST shape classification

Development of ambulatory ECG monitoring device with ST shap...

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International Conference on Control, Automation and Systems ( ICCAS)

作者： Gu-Young Jeong Kee-Ho Yu Division of Mechatronics Engineering Chonbuk National University of Korea Jeonju South Korea Division of Mechanical and Aerospace System Engineering Chonbuk National University of Korea Jeonju South Korea

In this paper, we describe the hardware configuration for ambulatory ECG monitoring device and the algorithm for detection of ST shape change. Ambulatory ECG recordings are available for diagnosis of heart diseases such as myocardial infarction, arrhythmia, etc. It especially is important to detect the transient ECG pattern changes. The detection of transient ST change caused by myocardial ischemia is one of the reasons why ambulatory ECG monitoring system is necessary. We designed a small-size portable ECG device that consisted of instrumentation amplifier, multiplexer, micro-controller, filter and transmitter module. The device measures ECG with four electrodes in the body and transmits the signal to receiver connected in PC by digital radio way. The developed algorithm detects the ST level change, and then classifies the ST shape type using the polynomial approximation. The algorithm finds the least squares curve for the data between S wave and T wave in ECG. This curve is used for the classification of the ST shapes. ST type is classified by comparing the slopes between the reference ST type and the least square curve. Through the result from the developed algorithm, we can know when the ST level change occurs and what the ST shape type is. And, the result of analysis is used to make control signal that decides when ECG recording begin and when stop.

关键词： Electrocardiography Monitoring Shape change detection algorithms Myocardium Least squares methods Hardware Cardiac disease Ischemic pain Instruments

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A Framework for False Positive Suppression in Video Segmentation

A Framework for False Positive Suppression in Video Segmenta...

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International Conference on Image Analysis and Processing

作者： Min Han Tun Geoff West Tele Tan Western Australia Curtin University of Technology Australia

ISBN: (纸本)9780769528779

Object detection in video surveillance is typically done through background subtraction or temporal differencing. While these techniques perform very well under scenes where there are minimal light changes, they begin to fail when the scene contains rapid illumination changes. The effects of this is most profound in indoor environments. Under these conditions, the background modeling techniques produce large numbers of false positives. This paper proposes a sequential approach to suppressing these false positives. Both frame and region level spatial scales are considered to detect sudden light changes and make use of Gabor filter responses and edge maps to identify and remove false positives.

关键词： Lighting Object detection Layout Image edge detection Gabor filters Pixel change detection algorithms Image processing Image texture analysis Image databases

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Just-in-time Adaptive Classifiers in Non-Stationary Conditions

Just-in-time Adaptive Classifiers in Non-Stationary Conditio...

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IEEE International Joint Conference on Neural Networks

作者： C. Alippi M. Roveri Poiecnico di Mino Dirieno di Eeronic e Inforzione Mino Iy

In real world applications ageing effects, process drifts, soft and hard faults may affect the data generation mechanism and, as a consequence, data coming from it. Intelligent measurement systems developed for such processes (e.g., industrial quality assessment and control, environmental monitoring) require adaptive techniques which, by tracking the system evolution, allow the intelligent system for keeping acceptable performance. Here we focus on adaptive classifiers embedded in intelligent measurement systems designed to cope with non-stationary environments, yet well performing in stationary conditions. The novelty of the approach resides in the possibility to update in a just-in-time fashion, i.e., only when it is really needed, the knowledge base of the classifier. A large experimental campaign shows the effectiveness of the proposed design.

关键词： Intelligent systems Knowledge management Neural networks Testing change detection algorithms Aging Electrical equipment industry Industrial control Quality assessment Control systems

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A Detect Motion Algorithm with Efficiency Priority for Embedded Systems

A Detect Motion Algorithm with Efficiency Priority for Embed...

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Workshop on Digital Media and its Application in Museum & Heritages

作者： Ren Yu Wang Jiaming The Institute of Intelligence and Software Technology HangZhou Dianzi University China

In a real-time video with surveillance embedded system, it is a hot research on an effective motion detection algorithm. In this paper, we bring forward a detected motion algorithm which is based on a 16 channels video card alarming system. This algorithm enhances the effectiveness obviously without losing the precision. By using the background shadowing algorithm, it can decrease much computation time of CPU when the background changes quickly; by using the self-adaptive algorithm for selecting the threshold, it can wipe off complex computation in the complex mathematical models, so it also can reduce the burden of CPU; the algorithm adapt to many requirements in different places and different sensitiveness. The result of experiments shows that our method can reduce the burden of computers effectively and get a better threshold compared with other methods.

关键词： Motion detection Embedded system Surveillance Algorithm design and analysis Software algorithms Central Processing Unit Layout change detection algorithms Application software Embedded software

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