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检索条件"主题词=change detection algorithms"

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Video Segmentation with Model-Based Sprite Generation for Panning Surveillance Cameras

Video Segmentation with Model-Based Sprite Generation for Pa...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Der-Chun Cherng Shao-Yi Chien Media IC and System Lab Graduate Institute of Electronics Engineering and Department of Electrical Engineering National Taiwan University Taipei Taiwan

Video segmentation is one of the most important techniques for advanced video surveillance systems. Most of the existing video segmentation algorithms suffer from high computational complexity to achieve acceptable results for surveillance systems and cannot deal with moving camera situations. In this paper, we propose a low complexity video segmentation algorithm with model-based sprite generation for panning cameras. The characteristics of surveillance systems are utilized to reduce the complexity of sprite generation, which is employed to register background information for panning cameras. In addition, several novel techniques are also proposed to improve the quality of segmentation results. Experimental results show that the proposed algorithm can effectively segment moving objects with good subjective quality.

关键词： Sprites (computer) Surveillance Cameras Image segmentation change detection algorithms Motion estimation Integrated circuit modeling Computational complexity Object segmentation Object detection

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Three-dimensional indoor localization in Non Line of Sight UWB channels

Three-dimensional indoor localization in Non Line of Sight U...

引用

IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

作者： Jens Schroeder Stefan Galler Kyandoghere Kyamakya Thomas Kaiser Institute of Communications Engineering (IKT) Leibniz University Hannover Germany Institute for Smart System-Technologies Alpen-Adria University of Klagenfurt Austria

The problem of indoor localization is lately gaining high interest in research and industry. In this context, Ultra-Wideband has the capability of fulfilling the task of precise localization. Non Line of Sight (NLOS) channels, however, can seriously degrade the positioning accuracy. This paper gives a contribution to the frequent case, where base station redundancy in a three-dimensional localization system in time-of-arrival (TOA) configuration is not available. Literature analysis shows that many existing NLOS mitigation algorithms cannot be applied in such a case. Therefore, an algorithm using geometrical projection is proposed in comparison to Kalman filtered range estimates. Both algorithms rely on NLOS detection, which is implemented using the change of SNR method. Finally, the algorithms are tested in a laboratory room using an UWB localization test bed.

关键词： Base stations change detection algorithms Ultra wideband technology Testing Redundancy Indoor environments Communication industry Context Degradation Laboratories

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Multi-Scale Rank-Permutation change Localization

Multi-Scale Rank-Permutation Change Localization

引用

IEEE Conference on Aerospace

作者： Neil H. W. Eklund Xiao Hu One Research Circle General Electric Global Research Schenectady NY USA

Prediction of equipment remaining useful life (RUL) is of considerable economic benefit to industry, by permitting the avoidance of unscheduled downtime and costly secondary damage. detection of change is an important first step in building a prognostic system: when a detectable fault occurs, it will cause changes in one or more sensed parameters of the system. Once a change has been detected, localizing the time of change (presumably the time of fault onset), can contribute to the estimate of RUL in two ways. First, it may make the RUL estimate more accurate. Second, and independent of estimate accuracy, it may make the prognostic estimate more precise by reducing the variance of the estimate. This paper describes an approach for localizing the time of change in time series data. The performance of the system is assessed using synthetic data that closely matches the characteristics of real-world data. However, the synthetic data is deterministically labeled, so algorithm performance can accurately be assessed. The approach presented requires low computational power at runtime, an important feature for on-wing application that combines the rank transformation of data, randomization tests inspired by the work of Fisher and Pitman, and fusion of multi-scale estimates to result in a fast and accurate localization of change.

关键词： Fault detection Signal processing algorithms Costs change detection algorithms Power generation economics Equipment failure detection algorithms Logic testing Sequential analysis Delay

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Pitch-by-Pitch Extraction from Single View Baseball Video Sequences

Pitch-by-Pitch Extraction from Single View Baseball Video Se...

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Hsuan-Sheng Chen Hua-Tsung Chen Wen-Jiin Tsai Suh-Yin Lee Jen-Yu Yu Department of Computer Science National Chiao Tung University Hsinchu Taiwan ICL/Industrial Technology Research Institute Hsinchu Taiwan

This paper presents a novel method for reducing a baseball video segment from one batter to next batter into a more compact pitch-by-pitch video by pitching ball trajectory detection. The pitch-by-pitch video shows the complete pitching and batting process and largely reduces the source video data, making pitching analysis of broadcast baseball sequences an easier task. The proposed method has been tested for several long sequences, and promising results are reported.

关键词： Video sequences Games Event detection Broadcasting Data mining Multimedia communication Information analysis Data analysis Object detection change detection algorithms

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Optimized destabilizing islanding protection scheme for grid-tied inverters insensitive to short term network disturbances

Optimized destabilizing islanding protection scheme for grid...

引用

European Conference on Power Electronics and Applications

作者： Christoph MAYR Roland Brundlinger Arsenal Research GmbH Vienna Austria

When interconnecting inverter based distributed generation (DG) systems to the distribution grid, an islanding detection is essential to avoid substantial safety and performance implications. Many anti- islanding methods currently used for grid connected inverters have weaknesses as high sensitivity resulting in spurious tripping or distortion of the output currents, particularly in multi-inverter installations. The main objective of the work presented here is to develop a new destabilising anti- islanding detection scheme, which combines an active frequency shift technique using positive feedback with a Rate of change of Frequency (RoCoF) detector and an innovative control algorithm. It enables to discriminate between short term frequency disturbances on the network and transition to or operation of an undesirable island. The optimized approach presented here reliably avoids unintentional islanding and furthermore exhibits optimal performance during frequency fluctuations in the network. It will be demonstrated that the new scheme has better performance than existing ones by using a SIMULINK model.

关键词： Protection Inverters Frequency Feedback change detection algorithms Mesh generation Distributed control Power system reliability Fluctuations Power system modeling

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Dissolve detection Scheme with Transition Duration Refinement

Dissolve Detection Scheme with Transition Duration Refinemen...

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International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIHMSP)

作者： Guo-Shiang Lin Min-Kuan Chang Shien-Tang Chiu Department of Computer Science and Information Engineering Da-Yeh University Changhua Taiwan Department of Electrical Engineering National Chung Hsing University Taichung Taiwan

ISBN: (纸本)9780769529943;0769529941

In this article, an efficient dissolve transition detection scheme was proposed. The proposed scheme is composed of adaptive thresholding, parameter calculation, and transition duration refinement. After adaptive thresholding, we coarsely find dissolve transition candidates. To identify dissolve transitions, a useful feature, model parameter, is extracted. Final, a transition duration refinement algorithm is utilized to search the precision duration. The experimental results demonstrate our proposed scheme can not only detect dissolve transitions well but also accurately locate their durations. Comparing with [6], our proposed scheme can provide a better performance for dissolve detection.

关键词： Gunshot detection systems Object detection Motion detection Histograms Computer science change detection algorithms Parameter estimation Feature extraction Equations Web and internet services

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Skeleton-Based Tornado Hook Echo detection

Skeleton-Based Tornado Hook Echo Detection

引用

IEEE International Conference on Image Processing

作者： Hongkai Wang Robert E. Mercer John L. Barron Paul Joe Department of Computer Science University of Western Ontario London ONT Canada King City Radar Station Meteorological Service of Canada Toronto ONT Canada

We propose and evaluate a method to identify tornadoes automatically in Doppler radar imagery by detecting hook echoes, which are important signatures of tornadoes, in Doppler radar precipitation density data. Our method uses a skeleton to represent 2D storm shapes. To characterize hook echoes, we propose four shape features of skeletons: curvature, curve orientation, thickness variation, boundary proximity, and two shape properties of tornadoes: southwest localization and the ratio of storm size to model hook echo size. To evaluate the hook echo detection algorithm, the hook echoes detected in several radar datasets by the algorithm are compared to those proposed by an expert. The effectiveness of the algorithm is quantified using a critical success index (CSI) analysis.

关键词： Tornadoes Skeleton Shape Doppler radar Storms Meteorological radar Radar detection Meteorology change detection algorithms Radar imaging

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Robust Face detection for Video Summary Using Illumination-Compensation and Morphological Processing

Robust Face Detection for Video Summary Using Illumination-C...

引用

International Conference on Natural Computation (ICNC)

作者： Jae-Ung Yun Hyung-Jin Lee Anjan Kumar Paul Joong-Hwan Baek Department of Information and Telecommunications Engineering Korea Aerospace University Koyang South Korea

This paper presents a simple and robust face detection algorithm that can be utilized to video summary. Because the characteristic of the face can be change from unexpected condition like as shadows or lighting, we firstly process the illumination-compensation for maintaining face components. And then, we analyze color-based face region in YCbCr space to obtain the skin color. Also, we try the morphological image processing called closing algorithm to improve the detection performance and reducing the number of false detected face regions. The steps of the closing algorithm are dilation and erosion that find the candidates in face region and removes noise from the non-face region. For localization of the face region, we make a proper face location based on golden ratio. We evaluate our algorithm in the various genres. Experimental results demonstrate the effectiveness of our face detection algorithm that leads 96.7 % precision ratio on average. The proposed method is applicable to video summary because of these high performances with low complexity.

关键词： Robustness Face detection Skin change detection algorithms Colored noise Neural networks Aerospace engineering Image color analysis Image processing Information analysis

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Hardware/Software co-design of a key point detector on FPGA

Hardware/Software co-design of a key point detector on FPGA

引用

Annual IEEE Symposium on Field-Programmable Custom Computing Machines (FCCM)

作者： H. Djakou Chati F. Muhlbauer T. Braun C. Bobda K. Berns Self-Organizing Embedded System Group Kaiserslautern University Germany Robotic Research Lab Kaiserslautern University Germany

The design and implementing of a key point detector on embedded reconfigurable hardware is investigated. The major challenges are efficient hardware/software partitioning of the key point detector algorithm, data flow management as well as efficient use of memory, bus and processor. We present a modular and manual hardware/software co-design, with its implementation on a Xilinx XUP-Virtex II Pro board co-design to solve these issues.

关键词： Hardware Detectors Field programmable gate arrays Convolution Embedded system Robots Object detection change detection algorithms Embedded computing Partitioning algorithms

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Belief Propagation in a 3D Spatio-temporal MRF for Moving Object detection

Belief Propagation in a 3D Spatio-temporal MRF for Moving Ob...

引用

Conference on Computer Vision and Pattern Recognition (CVPR)

作者： Zhaozheng Yin Robert Collins Department of Computer Science and Engineering Pennsylvania State University University Park PA USA

Previous pixel-level change detection methods either contain a background updating step that is costly for moving cameras (background subtraction) or can not locate object position and shape accurately (frame differencing). In this paper we present a belief propagation approach for moving object detection using a 3D Markov random field (MRF) model. Each hidden state in the 3D MRF model represents a pixel's motion likelihood and is estimated using message passing in a 6-connected spatio-temporal neighborhood. This approach deals effectively with difficult moving object detection problems like objects camouflaged by similar appearance to the background, or objects with uniform color that frame difference methods can only partially detect. Three examples are presented where moving objects are detected and tracked successfully while handling appearance change, shape change, varied moving speed/direction, scale change and occlusion/clutter.

关键词： Belief propagation Object detection Cameras Shape State estimation Message passing Image motion analysis Inference algorithms change detection algorithms Motion detection

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