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检索条件"主题词=change detection algorithms"

共 1588 条记录，以下是761-770 订阅

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detection of Speaker change Points in Conversational Speech

Detection of Speaker Change Points in Conversational Speech

引用

IEEE Conference on Aerospace

作者： Michael A. Carlin Brett Y. Smolenski Air Force Research Laboratory IFEC Rome NY USA Research Associates for Defense Conversion Inc. Marcy NY USA

An important preprocessing step in many automatic speech segmentation and speaker clustering systems is the accurate detection of speaker change points, the times when one speaker stops talking and another begins. However, this becomes very difficult in conversational speech since utterance lengths can be extremely short, speaker changes occur frequently, speakers may talk over one another (co-channel interference), and the recording environment and/or communication channel is sub-optimal or degraded. Modern aviation systems can benefit from this research as a pre-processing stage in a variety of applications. Examples include automatic segmentation and clustering of pilot/air traffic controller communications, detection of a third or unauthorized speaker in commercial airline cockpits, and automatic transcription of cockpit audio recordings. This research presents an approach to detecting speaker change points using information obtained from voiced speech segments. This permits taking advantage of the facts that (1) speaker starting and stopping information should be contained between segments of voiced speech and (2) voiced speech contains the most useful speaker identifiable information. The technique presented here shows promise as an enhancement to currently available change point detection algorithms.

关键词： Speech Interchannel interference change detection algorithms Loudspeakers Communication channels Degradation Air traffic control Humans Laboratories Audio recording

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Wavechange: a Procedure for change detection Based on Wavelet Product Spaces

Wavechange: a Procedure for Change Detection Based on Wavele...

引用

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

作者： Luis M.T. de Carvalho Fausto W. Acerbi Jose R. Scolforo Jose M. de Mello Antonio D. de Oliveira Federal University of Lavras Lavras Brazil

Our objective was to develop a procedure for change detection which is less sensitive to problems caused by misregistration, atmospheric effects and variations in vegetation phenology. The procedure is based on redundant wavelet transforms. Wavelet correlation was explored by taking point wise products of adjacent scales in order to enhance coefficients due to changes and smooth out noises. Local maxima were detected on the product spaces at varying spatial resolutions. The detected maxima were used as seeds for a multiscale region growing algorithm. The results showed that the method is not sensitive to geometric and radiometric misregistrations because of the multiresolution approach to feature extraction.

关键词： Radiometry Vegetation mapping Image analysis Atmospheric waves change detection algorithms Noise reduction Object detection Spatial resolution Earth Image sensors

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change detection of buildings in urban environment from high spatial resolution satellite images using existing cartographic data and prior knowledge

Change detection of buildings in urban environment from high...

引用

IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Mourad Bouziani Kalifa Goita Dong-Chen He Department of applied geomatics Centre d'applications et de recherches en télédétection University of Sherbrooke Sherbrooke Canada

Several studies in remote sensing image processing have tackled the issue of change detection for cartographic needs. Many algorithms have been developed, but very few have been applied for urban studies to update maps from high-spatial-resolution remote sensing images. The semantic richness of the image increases and makes image analysis more difficult. change detection from high spatial resolution images such as Ikonos and QuickBird is even more challenging, especially in complex environments like urban areas characterized by small objects such as houses, individual trees and roads, and by shadows. In addition, even if they are usually available, existing digital map data often are not incorporated in all steps of change detection process. This research project proposes a new object oriented method for the detection of building changes from high-spatial-resolution images in urban areas inspired by the specific problem of guiding the process by using existing cartographic data and knowledge. The use of the existing digital map and the integration of existing knowledge allow optimizing the change detection process on the image while offering the possibility to target and to accelerate the research of the changes.

关键词： Spatial resolution Satellites Remote sensing Object detection Urban areas Image processing change detection algorithms Image analysis Roads Object oriented methods

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Architecture for Parallel Crawling and Algorithm for change detection in Web Pages

Architecture for Parallel Crawling and Algorithm for Change ...

引用

International Conference on Information Technology (ICIT)

作者： Divakar Yadav A. K. Sharma J. P. Gupta N. Garg A. Mahajan JIIT University Noida India YMCA Faridabad India

In this paper, we put forward a technique for parallel crawling of the Web. The World Wide Web today is growing at a phenomenal rate. The size of the Web as on February 2007 stands at around 29 billion pages. One of the most important uses of crawling the Web is for indexing purposes and keeping Web pages up-to-date, later used by search engine to serve the end user queries. The paper puts forward an architecture built on the lines of a client server architecture. It discusses a fresh approach for parallel crawling the Web using multiple machines and integrates the trivial issues of crawling also. A major part of the Web is dynamic and hence, a need arises to constantly update the changed Web pages. We have used a three-step algorithm for page refreshment. This checks for whether the structure of a Web page has been changed or not, the text content has been altered or whether an image is changed. For the server we have discussed a unique method for distribution of URLs to client machines after determination of their priority index. Also a minor variation to the method of prioritizing URLs on the basis of forward link count has been discussed to accommodate the purpose of frequency of update.

关键词： Service oriented architecture change detection algorithms Web pages Uniform resource locators Crawlers Search engines Bandwidth Web sites Indexing Frequency

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An Effective Error Concealment Framework For H.264 Decoder Based on Video Scene change detection

An Effective Error Concealment Framework For H.264 Decoder B...

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International Conference on Image and Graphics (ICIG)

作者： Ji Zhang Feng Liu Hui Shao Gang Wang Nanjing Univ. of Posts & Telecomm China

In this paper, we propose an effective error concealment framework for H.264 decoder based on the scene change detection. The proposed framework quickly and accurately detects whether scene change occurs in the decoding frame, based on the detection result, both corrupted intra frames and damaged inter frames can be reconstructed by spatial or improved temporal EC (Error Concealment) algorithm. The experiment shows that, compared with the traditional error concealment method in the H.264/A VC non- normative decoder, the proposed framework has better robustness and can efficiently improve the visual quality and PSNR of the decoded video.

关键词： Decoding Layout change detection algorithms Automatic voltage control Video compression Image reconstruction Video sequences Image coding detection algorithms Video codecs

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Decentralized Sequential change detection Using Physical Layer Fusion

Decentralized Sequential Change Detection Using Physical Lay...

引用

IEEE International Symposium on Information Theory

作者： Leena Zacharias Rajesh Sundaresan ECE Department Indian Institute of Science Bangalore India

ISBN: (纸本)9781424413973;1424413974

We study the problem of decentralized sequential change detection with conditionally independent observations. The sensors form a star topology with a central node called fusion center as the hub. The sensors transmit a simple function of their observations in an analog fashion over a wireless Gaussian multiple access channel and operate under either a power constraint or an energy constraint. Simulations demonstrate that the proposed techniques have lower detection delays when compared with existing schemes. Moreover we demonstrate that the energy-constrained formulation enables better use of the total available energy than a power-constrained formulation.

关键词： Physical layer Wireless sensor networks Delay Sensor systems Topology change detection algorithms Statistics Bayesian methods Cost function Parameter estimation

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Probabilistic Text change detection Using an Immune Model

Probabilistic Text Change Detection Using an Immune Model

引用

International Joint Conference on Neural Networks (IJCNN)

作者： Matti Polla Timo Honkela Adaptive Informatics Research Centre (AIRC) Helsinki University of Technology Espoo Finland

We present a probabilistic approach for detecting and analyzing changes in natural language motivated by biological immune systems. Contrary to traditional methods based on message-digest algorithms and line-by-line comparisons of two files, the proposed algorithm employs an implicit negative representation of text segments in the form of detector strings. A characteristic property of the presented change detection method is that it allows the analysis to be done without revealing the full contents of the original data to the authenticator. Implications of this property to security applications are outlined and an experiment is conducted to show how several incremental changes to a collaboratively maintained document can be analyzed.

关键词： Text analysis Natural language processing Neural networks Immune system Information analysis change detection algorithms Collaboration Natural languages Detectors Data security

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Robust change-detection by Normalised Gradient-Correlation

Robust Change-Detection by Normalised Gradient-Correlation

引用

Conference on Computer Vision and Pattern Recognition (CVPR)

作者： Robert O'Callaghan Tetsuji Haga Visual Information Laboratory Mitsubishi Electric ITE Guildford UK Advanced Technology R&D Center Mitsubishi Electric Corporation Limited Amagasaki Hyogo Japan

A novel algorithm for robustly segmenting changes between different images of a scene is presented. This computationally efficient algorithm is based on a non-linear comparison of gradient structure in overlapping image-regions and offers intrinsic invariance to changing illumination, without recourse to background-model adaptation. High accuracy is demonstrated on test video data with and without illumination changes. The technique is applicable to motion-segmentation as well as measuring longer-term object-changes.

关键词： Robustness Lighting change detection algorithms Application software Layout Pixel Object detection Motion detection Algorithm design and analysis Motion analysis

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Distributed algorithm for change detection in satellite images for Grid Environments

Distributed algorithm for change detection in satellite imag...

引用

International Symposium on Parallel and Distributed Computing

作者： Florin Pop Claudiu Gruia Valentin Cristea Faculty of Automatics and Computer Science University Politehnica of Bucharest Romania

ISBN: (纸本)9780769529172;0769529178

This paper presents a solution for real-time satellite image processing. The focus is on the detection of changes in MODIS images. We present a distributed algorithm for change detection which is based on extracting relevant parameters from MODIS spectral bands. The algorithm detects the changes between two images of the same geographical area at different time moments. The algorithm, able to run in a Grid system, is scalable, fault-tolerant. We present the experimental results of this algorithm considering three spectral bands and different input images. We also propose a method to integrate applications based on this algorithm into the MedioGRID architecture.

关键词： Distributed algorithms change detection algorithms Image processing Clustering algorithms Grid computing Application software Satellite broadcasting MODIS Computer architecture detection algorithms

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Unsupervised Speaker change detection for Mobile Device Recorded Speech

Unsupervised Speaker Change Detection for Mobile Device Reco...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Olli Vuorinen Johannes Peltola Satu-Marja Makela VTT Technical Research Center of Finland Oulu Finland

In this paper we propose an unsupervised speaker change detection (SCD) system developed for mobile device applications. We use Bayesian information criterion (BIC) to find initial speaker changes, which are then verified or discarded in the second phase by utilizing modified BIC and silence detector information. Silence information usage after initial BIC in decision making is useful to separate real changes from noise peaks. Enhanced peak detector adjusts BIC penalty parameter automatically, which improve the robustness and feasibility. Improved BIC based false alarm compensation (FAC) merges effectively consecutive segments belonging to same speaker. Our experiments have shown the robustness of the algorithm and it produces very satisfactory results for difficult mobile phone recorded speech data.

关键词： Audio recording change detection algorithms Detectors Image segmentation Noise robustness Multimedia databases Video recording Indexing Speech analysis Bayesian methods

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