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Region-based coding of images using a spline model

Region-based coding of images using a spline model

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IEEE International Conference on image processing

作者： R. Baseri J.W. Modestino Electrical Computer and Systems Engineering Department Center for Image Processing Research Rensselaer Polytechnic Institute Troy NY USA

This paper describes a second-generation region-based coding scheme operating in a subband environment. Specifically, this is a compression technique based on approximating the lowest-frequency subband of an image with a 2-D spline model. Following a segmentation procedure, parametric polynomials are fitted to the resulting regions of the lowest-frequency subband. This subband is then represented by the spline coefficients, the region boundary description and the residual error. The residual error plus the higher-frequency subbands are encoded using conventional pixel-based quantization schemes while we describe an efficient encoding scheme for the 2-D spline representation. An entropy-constrained design procedure is developed for designing these individual encoders to minimize the overall mean-square distortion subject to a constraint on the output entropy. A comprehensive study of the operational rate-distortion performance of the resulting scheme is presented, which indicates the superiority of this approach to the more traditional pixel-based entropy-constrained schemes.< >

关键词： image coding Spline Polynomials Pixel image segmentation Systems engineering and theory image processing Quantization Entropy Contracts

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Multi-Contextual and Multi-Aspect Analysis for Road Surface Type Classification Through Inertial Sensors and Deep Learning

Multi-Contextual and Multi-Aspect Analysis for Road Surface ...

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Brazilian Symposium on Computing System Engineering (SBESC)

作者： Jeferson Menegazzo Aldo von Wangenheim Graduate Program in Computer Science (PPGCC) Image Processing and Computer Graphics Lab (LAPIX) Brazilian National Institute for Digital Convergence (INCoD) Federal University of Santa Catarina (UFSC) Florianópolis Brazil

ISBN: (数字)9781728182865

ISBN: (纸本)9781728182872

The demand for a variety of situational data from the traffic environment and its participants has intensified with the development of applications in Intelligent Transport Systems (ITS). Among these data, the road surface type classification is one of the most important and can be used in the entire ITS domain. For its widespread application, it is necessary to employ a robust technology for the generation of raw data and to develop of a reliable and stable model to process these data in order to produce the classification. The developed model must operate correctly in different vehicles, under different driving styles and in different environments in which a vehicle can travel. In this work we employ inertial sensors, represented by accelerometers and gyroscopes, which are a safe, non-polluting, and low-cost alternative, ideal for large-scale use. We collect nine datasets with contextual variations, including three different vehicles, with three different drivers, in three different environments, in which there are three different road surface types, in addition to variations in the conservation state and presence of anomalies and obstacles such as potholes and speed bumps. After data collection, these data were used in experiments to evaluate various aspects, such as the influence of the vehicle data collection point, the analysis domain, the model input features, and the data window. Afterwards we evaluated the learning and generalization capacity of the models for unknown contexts. In a third step, the data were used in three Deep Neural Network (DNN) models: LSTM-based, GRU-based, and CNN-based. Through a multi-aspect and multi-contextual analysis, we considered the CNN-based model as the best one, which obtained an average accuracy between the data collection placements of 94.27% for learning and 92.70% for validation, classifying the road surface between asphalt, cobblestone or dirt road segments.

关键词： Roads Sensors Data models Vehicles Sensor systems Deep learning Data collection

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Lossy-to-lossless block-based compression of hyperspectral volumetric data

Lossy-to-lossless block-based compression of hyperspectral v...

引用

IEEE International Conference on image processing

作者： Xiaoli Tang W.A. Pearlman Center for Image Processing Research Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy NY USA

An embedded, block-based, wavelet transform coding algorithm of low complexity is proposed. Three-dimensional set partitioned embedded block (3D-SPECK) efficiently encodes, hyperspectral volumetric image data by exploiting the dependencies in all dimensions. Integer wavelet transform is applied to enable lossy and lossless decompression from the same bit stream. We demonstrate that 3D-SPECK, a wavelet domain algorithm, like other time domain algorithms, can preserve spectral profiles well. Airborne visible infrared imaging spectrometer (AVIRIS) imagery is used to test the proposed algorithm. Results show that 3D-SPECK, in addition to being very flexible, retains all the desirable features of compared state-of-the-art algorithms and is highly competitive to 3D-SPIHT and better than JPEG2000 multi-component in compression efficiency.

关键词： Hyperspectral imaging Partitioning algorithms image coding Transform coding Wavelet transforms Streaming media Wavelet domain Infrared imaging Infrared spectra Spectroscopy

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Second Order Statistics of Non-Isotropic Mobile-to-Mobile Ricean Fading Channels

Second Order Statistics of Non-Isotropic Mobile-to-Mobile Ri...

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IEEE International Conference on Communications (ICC)

作者： X. Cheng C.-X. Wang D. I. Laurenson A. V. Vasilakos Joint Research Institute for Signal and Image Processing Heriot-Watt University Edinburgh UK Joint Research Institute for Signal and Image Processing University of Edinburgh Edinburgh UK Department of Computer and Telecommunications Engineering University of Western Macedonia Koza-gun Greece

This paper develops a generic geometry-based stochastic model for mobile-to-mobile (M2M) Ricean fading channels. From the generic model, the level crossing rate (LCR) and average fade duration (AFD) are derived. Based on the derived expressions, we for the first time investigate the LCR and AFD for M2M channels with different vehicular traffic densities (VTDs). Excellent agreement is achieved between the theoretical results and measured data, demonstrating the utility of the proposed model.

关键词： Statistics Fading MIMO Solid modeling Mobile communication Signal processing image processing Stochastic processes Intelligent transportation systems Communications Society

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An interaction interface for multiple agents on shared 3D display

An interaction interface for multiple agents on shared 3D di...

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2nd International Conference on Cooperative Design, Visualization, and Engineering, CDVE 2005

作者： Choi, Jeong-Dan Hwang, Chi-Jeong Telematics Solution Research Team Telematics and RFID Research Department Electronic and Telecommunications Research Institute 161 Gajeong-dong Yuseong-gu Dajeon 305-350 Korea Republic of Image Processing Laboratory Computer Engineering Department Chungnam National University 220 Gung-dong Yuseong-gu Daejeon 305-764 Korea Republic of

ISBN: (纸本)3540289488

In the multi-user VR game, wide stereoscopic display is an important component that supports immersion and perception to the gamer. Because the space in front of the display allows multi-participants to collaborate and guarantees view with the entire field of view for each user. This paper describes a method to integrate user interfaces for interactions among users wear VR devices on wide stereoscopic display. The key technologies of our proposed system include the problems of coordination with various devices to treat user events in real-time, synchronization of PC clusters which renders the VR contents, and seamless display of multi-channel display surfaces. To accomplish this, we propose a VR game display platform composed of multi-projectors, stereoscopic see-through head mounted device, and gesture recognition system for collaborative interactions. Our preliminary results showed that the proposed strategy well suits high resolution application at real-time frame rate for VR game. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Display devices

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Dense SIFT and Gabor Descriptors-Based Face Representation with Applications to Gender Recognition

Dense SIFT and Gabor Descriptors-Based Face Representation w...

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International Conference on Control, Automation, Robotics and Vision

作者： Jian-Gang Wang Jun Li Chong Yee Lee Wei-Yun Yau Department of Computer Vision and Image Processing Institute for Infocomm Research 1 Fusionopolis Way 21-01 Connexis Singapore 138632

ISBN: (纸本)9781424478149

In this paper, a novel face representation in terms of dense local image descriptors is proposed. Scale Invariant Feature Transform (SIFT) and Gabor, two of the most popular local image descriptors, at dense grid pixels of a face image are used to represent the face. The efficiency of the representation has been investigated in gender recognition. There are four problems when applying the SIFT to facial gender recognition. (1) There may be only a few keypoints that can be found in a face image due to the missing texture and ill-illumined faces;(2) The SIFT descriptors at the keypoints (we called it sparse SIFT) are distinctive whereas alternative descriptors at non-keypoints (e.g. grid) could cause negative impact on the accuracy;(3) Most of the existing methods employ SIFT descriptors matching in which relative larger image size is required in order that enough keypoints can be found to support the matching and (4) The matching is assumed that the faces are well registered. We provide solutions to the above difficulties in this paper and the problem of recognizing gender using the combination of SIFT descriptors and Gabor of face images is studied. The Gabor representations of the face images are fused with the dense SIFT at the feature-level to improve the accuracy. AdaBoost is adopted to select features and form a strong classifier. The experimental results on a large set of faces have shown that the proposed method can achieve high accuracies even for faces that are not aligned.

关键词： gender recognition dense SIFT Gabor AdaBoost fusion

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Exploration and application of virtual simulation practice teaching evaluation system under the background of new engineering 16

Exploration and application of virtual simulation practice t...

引用

16th IEEE International Conference on computer Science and Education, ICCSE 2021

作者： Yong, Jiu Wang, Yangping Dang, Jianwu Lanzhou Jiaotong Univeristy The National Computer Experimental Teaching Demonstration Center Lanzhou China Lanzhou Jiaotong University The National Virtual Simulation Experiment Teaching Center of Railway Traffic Information and Control China Lanzhou Jiaotong University The School of Electronic and Information Engineering China Gansu Provincial Engineering Research Center for Artificial Intelligence and Graphics and Image Processing Lanzhou China

ISBN: (纸本)9781665414685

Virtual simulation experiment teaching can be carried out in any environment without the limitation of time and space, and used repeatedly for learning, more intuitive understanding of principle and method of the whole experiment, to combine the experimental content and abstract theory, and teachers can improve students' learning situation in virtual simulation teaching line tracking. The exploration and application of evaluation system of virtual simulation practice teaching under the background of new engineering is carried out. By scoring the students' preview, operation, experimental results and reports, and examination, a four-stage process evaluation method of 'preview before class - experimental operation - review after class comprehensive assessment' is constructed. The core of the evaluation system is the cultivation of virtual simulation talents' practice and innovation ability, and virtual simulation is emphasized. The exploration of real experiment teaching process evaluation system and the establishment of comprehensive evaluation index system can promote the deep integration of classroom teaching and virtual simulation experiment teaching, cultivate virtual simulation practice teaching resources and develop teachers, and make the virtual simulation experiment teaching evaluation mode more perfect. © 2021 IEEE.

关键词： Virtual reality

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Live Cell Segmentation in Fluorescence Microscopy via Graph Cut

Live Cell Segmentation in Fluorescence Microscopy via Graph ...

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International Conference on Pattern Recognition

作者： Milán Leskó Zoltan Kato Antal Nagy Imre Gombos Zsolt Török Laszlo Vigh Jr László Vígh Department of Image Processing and Computer Graphics University of Szeged Szeged Hungary Molecular Stress Biology Group Institute of Biochemistry Biological Research Center Hungarian Academy of Sciences (ATOMKI) Hungary Molecular Stress Biology Group Biological Research Center

We propose a novel Markovian segmentation model which takes into account edge information. By construction, the model uses only pairwise interactions and its energy is sub modular. Thus the exact energy minima is obtained via a max-flow/min-cut algorithm. The method has been quantitatively evaluated on synthetic images as well as on fluorescence microscopic images of live cells.

关键词： image segmentation Microscopy Pixel Computational modeling Mathematical model Biomembranes Biology

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Adaptive hierarchical stereo matching using object segmentation and window warping

Adaptive hierarchical stereo matching using object segmentat...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Jae-Chul Kim Byoung-Ho Kang Maeng-Sub Cho Color Imaging Research Team Image Processing Department Computer and Software Technology Laboratory Electronics and Telecommunications Research Institute Taejon South Korea

In this paper, we propose an adaptive stereo matching algorithm to encompass stereo matching problems in projective distortion region. Since the projective distortion region can not be estimated in terms of fixed-size block matching algorithm, we tried to use adaptive window warping method in hierarchical matching process to compensate the perspective distortions. In addition, probability theory was adopted to encompass uncertainty of disparity of points over the window in this study. The proposed stereo matching algorithm has been tested on both disparity map and 3D model view. The experimental results show that remarkable improvement is obtained in the projective distortion region.

关键词： Object segmentation Optical distortion Uncertainty Cameras Solid modeling Color image processing Laboratories Software algorithms Testing

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Method for automatically segmenting the spinal cord and canal from 3D CT images

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11th International Conference on computer Analysis of images and Patterns, CAIP 2005

作者： Nyúl, Lászlo G. Kanyó, Judit Máté, Eörs Makay, Géza Balogh, Emese Fidrich, Márta Kuba, Attila Department of Image Processing and Computer Graphics University of Szeged Árpád tér 2 H-6720 Szeged Hungary Clinical Software Engineering GE Medical Systems Lajos u. 48-66 H-1036 Budapest Hungary Institute of Mathematics University of Szeged Aradi vértanuk tere 1 H-6720 Szeged Hungary

ISBN: (纸本)3540289690

We present two approaches for automatically segmenting the spinal cord/canal from native CT images of the thorax region containing the spine. Different strategies are included to handle images where only part of the spinal column is visible. The algorithms require one seed point given on a slice located in the middle region of the spine, and the rest is automatic. The spatial extent of the spinal cord/canal is determined automatically. An extended region-growing technique is suggested for segmenting the spinal canal while active contours are applied if the spinal cord is to be segmented. Both methods work in 2D and use propagated information from neighboring slices. They are also very rapid in execution, that means an efficient, user-friendly workflow. The methods were evaluated by radiologists and were found to be useful (in reducing/eliminating contouring labor and time) and met the accuracy and repeatability requirements for the particular task. © Springer-Verlag Berlin Heidelberg 2005.

关键词： computerized tomography

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