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检索条件"主题词=Detection algorithms"

共 7382 条记录，以下是4871-4880 订阅

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Camera localization and building reconstruction from single monocular images

Camera localization and building reconstruction from single ...

引用

IEEE Computer Society Conference on Computer Vision and Pattern Recognition Workshops (CVPRW)

作者： Ruisheng Wang Frank P. Ferrie Centre for Intelligent Machines McGill University Montreal QUE Canada

This paper presents a new method for reconstructing rectilinear buildings from single images under the assumption of flat terrain. An intuition of the method is that, given an image composed of rectilinear buildings, the 3D buildings can be geometrically reconstructed by using the image only. The recovery algorithm is formulated in terms of two objective functions which are based on the equivalence between the vector normal to the interpretation plane in the image space and the vector normal to the rotated interpretation plane in the object space. These objective functions are minimized with respect to the camera pose, the building dimensions, locations and orientations to obtain estimates for the structure of the scene. The method potentially provides a solution for large-scale urban modelling using aerial images, and can be easily extended to deal with piecewise planar objects in a more general situation.

关键词： Image reconstruction Layout Image edge detection Large-scale systems Urban planning Iterative algorithms Smart cameras Buildings Computer vision detection algorithms

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Vision Based Spectroscopy Simulation

Vision Based Spectroscopy Simulation

引用

Canadian Conference on Computer and Robot Vision, CRV

作者： Eranga Ukwatta Ranga Rodrigo Jagath Samarabandu Mike Hall Department of Electrical and Computer Engineering University of Western Ontario London ONT Canada Checkfluid Inc. London ONT Canada

Computer vision based spectroscopy is feasible due to the advent of faster cameras and computers. Here, spectroscopy means detecting elements based on the intensity patterns of laser induced breakdown spectra seen by a camera. This is conventionally done by using specific instruments-spectroscopes-which too may use CCD devices as the sensors. Using a commercial camera reduces the cost of the product, while enabling the testing of new detection algorithms. A simulation setup is helpful in this context. The computer vision based spectroscopy simulation, which we propose here, involves displaying patterns on a computer screen corresponding to a reduced standard database of spectra, observing the screen using a camera, and detecting the elements, preferably on a different computer. We show that, using markers and computing homographies, correct alignment of the scene and image planes can be achieved to detect the element. This set up can be used to test detection algorithms, and we apply a simple correlation based algorithm for pattern detection.

关键词： Spectroscopy Computer vision Cameras Computational modeling Testing detection algorithms Computer displays Electric breakdown Instruments Charge coupled devices

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Frequency interpretation of tidal peak in intracranial pressure wave

Frequency interpretation of tidal peak in intracranial press...

引用

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

作者： Sima Shahsavari Tomas McKelvey Department of Signals and Systems Chalmers University of Technology Sweden

A new approach to locate different components of ICP signal for each cardiac induced ICP beat is presented. In this method an initial timing map is used to define the appropriate part of the ICP wave which should be searched for the specific component. In parallel a recently proposed method was used to decompose the ICP wave to its different frequency harmonics. This algorithm, which is based on tracking the amplitude of the harmonic components using Kalman filtering, brings both heart rate variability and cardiorespiratory interaction into account and provides good time and frequency resolution. Comparing the results of two methods for seventeen ICP records, each one hour long, it has been observed that the fundamental cardiac component has the most significant contribution in the construction of the tidal peak in ICP and therefore tracking of this harmonic could be informative of the tidal peak evolution over the time.

关键词： Harmonic analysis Time-frequency analysis Kalman filters Electrocardiography detection algorithms Monitoring Power harmonic filters

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Local Descriptor by Zernike Moments for Real-Time Keypoint Matching

Local Descriptor by Zernike Moments for Real-Time Keypoint M...

引用

Congress on Image and Signal Processing, CISP

作者： Sun-Kyoo Hwang Mark Billinghurst Whoi-Yul Kim Image Engineering Laboratory Hanyang University Seoul South Korea The HIT Laboratory NZ University of Canterbury Christchurch New Zealand

This paper presents a real-time keypoint matching algorithm using a local descriptor derived by Zernike moments. From an input image, we find a set of key-points by using an existing corner detection algorithm. At each keypoint we extract a fixed size image patch and compute a local descriptor derived by Zernike moments. The proposed local descriptor is invariant to rotation and illumination changes. In order to speed up the computation of Zernike moments, we compute the Zernike basis functions in advance and store them in a set of lookup tables. The matching is performed with an Approximate Nearest Neighbor (ANN) method and refined by a RANSAC algorithm. In the experiments we confirmed that videos of frame size 320x240 with the scale, rotation, illumination and even 3D viewpoint changes are processed at 25~30Hz using the proposed method. Unlike existing keypoint matching algorithms, our approach also works in real-time for registering a reference image.

关键词： Signal processing algorithms Detectors detection algorithms Lighting Principal component analysis Pixel Table lookup Nearest neighbor searches Videos Robustness

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Ear biometrics using jet space similarity

Ear biometrics using jet space similarity

引用

Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Daishi Watabe Hideyasu Sai Katsuhiro Sakai Osamu Nakamura Saitama Institute of Technology Kogakuin University Japan

An ear biometric system that extends the ideas from elastic graph matching and principal component analysis (PCA) is introduced. For ear representation, an ldquoear graphrdquo whose vertices are labeled by the Gabor jets of body of the antihelix, superior antihelix crus, and inferior antihelix crus is introduced. A new ear detection algorithm is developed, introducing the notion of ldquojet space similarity,rdquo which denotes the similarity between Gabor jets and reconstructed jets obtained by PCA. Using the Extended Multi Modal Verification for Teleservices and Security applications (XM2VTS) database, the performance of the introduced system is found to be comparable to that of existing systems, and the detection performance is found to be higher compared with existing object detection algorithms using the distance from face space and average jets.

关键词： Ear Biometrics Principal component analysis Object detection Face detection Face recognition Space technology detection algorithms Data security Databases

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Joint channel-symbol estimation for high-performance differential MIMO

Joint channel-symbol estimation for high-performance differe...

引用

Asilomar Conference on Signals, Systems & Computers

作者： M. Rezk B. Friedlander Department of Electrical Engineering University of California Santa Cruz CA USA

Joint channel-symbol estimation has been recently applied to a differential unitary space-time coded Multiple Input Multiple Output (MIMO) system in order to reduce the SNR penalty of differential encoding relative to coherent communications. Using unitary codes restricts the data rate to one symbol per channel use. A block differential MIMO technique was presented in which allows the use of non-orthogonal full-rate full-diversity codes. In this paper joint channel-symbol estimation is used to reduce the SNR penalty of the block differential MIMO system. A computationally efficient suboptimal detection algorithm is presented.

关键词： MIMO Transmitting antennas Space time codes detection algorithms Wireless communication Communication standards Mobile communication Fading Receiving antennas Rotation measurement

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Advanced phase-based segmentation of multiple cells from brightfield microscopy images

Advanced phase-based segmentation of multiple cells from bri...

引用

IEEE International Symposium on Biomedical Imaging

作者： Rehan Ali Mark Gooding Martin Christlieb Michael Brady Dept of Engineering Science University of Oxford UK Nuffield Dept of Obstetrics and Gynaecology University of Oxford UK Gray Cancer Institute University of Oxford UK Wolfson Medical Vision Labs Dept of Engineering Science University of Oxford UK

Segmenting transparent phase objects, such as biological cells from brightfield microscope images, is a difficult problem due to the lack of observable intensity contrast and noise. Previous image analysis solutions have used excessive de- focusing or physical models to obtain the underlying phase properties. Here, an improved cell boundary detection algorithm is proposed to accurately segment multiple cells within the level set framework. This uses a novel speed term based on local phase and local orientation derived from the monogenic signal, which renders the algorithm invariant to intensity, making it ideal for these images. The new method can robustly handle noise and local minima, and distinguish touching cells. Validation is shown against manual expert segmentations.

关键词： Image segmentation Microscopy Biological cells Phase noise Image analysis Focusing Biological system modeling detection algorithms Level set Rendering (computer graphics)

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Lexical model for ASR of fluent Polish speech - analyze of polish phonology and phonetics

Lexical model for ASR of fluent Polish speech - analyze of p...

引用

International Conference on Signals and Electronic Systems, ICSES

作者： Krzysztof Rutecki Ryszard Makowski Wydział Elektroniki Politechnika Wroclawska Poland

Deep analysis of Polish phonology and phonetic can help in efficient automatic speech recognition of fluent *** goal of this paper is to present some techniques used in words boundary detection algorithm in stream of phonemes. This new idea of ASR of fluent speech will be presented. The results of the experiment on the word with two-phoneme occurrences will be presented in this paper.

关键词： Speech analysis Automatic speech recognition Speech recognition Resonance Signal analysis detection algorithms Oral communication Vocabulary Speech processing Statistical analysis

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Analysis and classification of beaked whale buzz clicks

Analysis and classification of beaked whale buzz clicks

引用

New Trends for Environmental Monitoring Using Passive Systems

作者： Odile Gerard Stefano Coraluppi Craig Carthel NATO Undersea Research Centre La Spezia Italy

This study shows the variation in Blainville's beaked whale buzz click characteristics. Due to the lack of statistical consistency, single-click classification appears infeasible. Nonetheless, the spectrum is very similar from one click to the next. Thanks to this slow variation it is possible to associate clicks using automatic tracking techniques [1]. Subsequently, tracks can be classified as buzzes based on the inter-click intervals.

关键词： Whales Frequency Detectors Electronic mail Data analysis Spectrogram detection algorithms Animals Acoustic testing Acoustic signal detection

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Improved torpedo range estimation using modified fast orthogonal search techniques

Improved torpedo range estimation using modified fast orthog...

引用

OCEANS

作者： Vincent Dagenais Donald R. McGaughey Sean Pecknold Department 626 L-3 Communications Inc. Mirabel QUE Canada Royal Military College of Canada Kingston ONT Canada Defence Research and Development Canada Dartmouth NS Canada

ISBN: (纸本)9781424426195

This work introduces a modified torpedo detection algorithm (MTDA) that improves upon the range estimates of an earlier torpedo detection algorithm (TDA). The original TDA detects the presence of a direct path and a surface reflected path for a torpedo acoustic tonal using the fast orthogonal search (FOS) algorithm. In the original TDA the candidate functions used by FOS were sinusoidal functions at a constant frequency. Using the frequencies of the direct and reflected path signal, the TDA estimated the torpedo range. It is known that the frequency of the direct path and reflect path signal will vary in time. It is also well known that correlating a received signal with the expected signal results in the lowest probability of error in detection (matched filter). Thus in this work the candidate functions used by FOS are functions whose frequencies vary in time (chirp signals) as theoretically expected for the direct and reflected path signals. Also, the FOS algorithm is modified to fit the direct and reflected paths in pairs. The pair of frequencies that fit the highest energy is determined to be the direct and reflected path signal and the range used to generate that candidate pair is used as the range estimate. The MTDA algorithm is simulated for a torpedo approaching an receiver at several angles and the range estimations are shown. These results are compared with the earlier TDA and shown to be significantly improved.

关键词： detection algorithms Frequency estimation Signal resolution Acoustic signal detection Signal generators Iterative algorithms Acoustic waves GSM Military communication Educational institutions

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