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检索条件"任意字段=3rd International Symposium on 3D Data Processing, Visualization and Transmission"

共 655 条记录，以下是321-330 订阅

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Energy Efficient 3d Positioning of Micro Unmanned Aerial Vehicles for Underlay Cognitive Radio Systems

Energy Efficient 3D Positioning of Micro Unmanned Aerial Veh...

引用

IEEE international Conference on Communications (ICC) / Wireless Communications symposium / 3rd Workshop on Optical Wireless Communications (OWC)

作者： Ghazzai, Hakim Ben Ghorbel, Mandi Kadri, Abdullah Hussain, Md Jahangir Qatar Univ QMIC Doha Qatar Univ British Columbia Okanagan Campus Kelowna BC Canada

ISBN: (纸本)9781467389990

Micro unmanned aerial vehicles (MUAVs) have attracted much interest as flexible communication means for multiple applications due to their versatility. Most of the MUAV-based applications require a time-limited access to the spectrum to complete data transmission due to limited battery capacity of the flying units. These characteristics are the origin of two main challenges faced by MUAV-based communication: 1) efficient energy management, and 2) opportunistic spectrum access. This paper proposes an energy-efficient solution, considering the hover and communication energy, to address these issues by integrating cognitive radio (CR) technology with MUAVs. A non convex optimization problem exploiting the mobility of MUAVs is developed for the underlay CR technique. The objective is to determine an optimized three-dimension (3d) location, for a secondary MUAV, at which it can complete its data transfer with minimum energy consumption and without harming the data rate requirement of the primary spectrum owner. Two algorithms are proposed to solve these optimization problems: a meta-heuristic particle swarm optimization algorithm (PSO) and a deterministic algorithm based on Weber formulation. Selected numerical results show the behavior of the MUAV versus various system parameters and that the proposed solutions achieve very close results in spite of the different conceptional constructions.

关键词： Underlay cognitive radio 3d positioning unmanned aerial vehicle-based communications

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Point samples for efficient 3d processing and content creation

Point samples for efficient 3D processing and content creati...

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international symposium on 3d data processing visualization and transmission

作者： M. Gross

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Ordered subsets convex algorithm and automatic image processing sequences: The solid bases for 3d THz inspection 7th

Ordered subsets convex algorithm and automatic image process...

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international symposium on Ultrafast Phenomena and Terahertz Waves, ISUPTW 2014

作者： Balacey, H. Perraud, J.-B. Bou Sleiman, J. Recur, B. Mounaix, P. LOMA Bordeaux University CNRS-UMR 5798 351 cours de la Libération Talence33405 France Noctylio S.A.S 59 cours de l'Intendance Bordeaux33000 France Australian National University Dept Applied Maths RSPE Canberra Australia

In the field of non-destructive testing, Terahertz (THz) tomography is a modern imaging technique permitting 3d inspection of opaque objects. A tomographic procedure reconstructs a 3d volume of the acquired object by intersecting the data contained on the projection set. This depth information is extracted from several projections acquired around the object at different viewing angles. This property has made THz tomography a complementary technique to X-Rays. Several reconstruction methods have been investigated for THz tomography [1] but they must be adapted to THz wave properties. For monochromatic source, Beer-Lambert law describes the attenuation encountered by THz waves through the sample and measured on the detector, when reflexion and refraction effects are neglected. Then, as their complements in X-Ray tomography, we investigate in this paper on a Maximum-Likelihood expectation-maximization for transmission tomography (ML-TR) compatible with THz radiations. This method, based on Poisson distribution model of measured radiations, takes into account the Gaussian propagation of THz beam [2] and allows introducing some a priori knowledge about the imaged object. Especially, we focus on the implementation denoted Ordered Subsets Convex (OSC) algorithm since it has an efficient convergence rate despite of the noise level and the sparsity of acquired data [3]. We discuss how this new reconstruction is able to estimate physical properties of samples acquired with a 100GHz/300GHz scanner in addition to the 3d reconstruction. Moreover, we present an innovative data and image processing sequence to perform non-destructive inspection from 3d terahertz (THz) images. After a 3d tomographic reconstruction of a sample, a preset segmentation affords the different regions of interest (ROI) composing the inert part of sample. Then a 3d visualization and dimensional measurements could be performed on these ROI, separately, in order to provide new informations of the studied sam

关键词： Image processing Image processing algorithms Nondestructive testing Segmentation Three dimensional reconstruction Tomography

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QSplat compression 04

QSplat compression

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AFRIGRAPH 2004: 3rd international Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa

作者： Namane, Rachid Boumghar, Fatima O. Bouatouch, Kadi ParIMéd Team LRPE USTHB BP 32 El Alia Bab-Ezzouar Algiers Algeria IRISA Campus de Beaulieu 35042 Rennes Cedex France

ISBN: (纸本)9781581138634

The great advances in the field of 3d scanning technologies have enabled the creation of meshes with hundred millions of polygons. Rendering data sets of that size is time consuming even with commodity graphics hardware. The QSplat technique that has been introduced by S. Rusinkiewics and M. Levoy of Stanford University is used for the inter-active point based visualization of large 3d scenes. Nevertheless, it has some drawbacks like the storage requirement which is still higher. The objective of our work we present in this paper is to improve the per-node storage requirements of QSplat models and to minimize the transmission cost in streaming QSplat models across low-bandwidth networks or bottlenecked networks. To do that, we focus on coding strategies which provide reasonable data reduction at low decoding complexity. In this context, Huffman and relative delta encoding fit well with our purposes. The performances of the compression process are studied and the rendering algorithm is extended in order to be able to work on compressed data without loosing the original system interactivity. Copyright © 2004 by the Association for Computing Machinery, Inc.

关键词： Scanning

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Holo reality: Real-time, low-bandwidth 3d range video communications on consumer mobile devices with application to augmented reality

Holo reality: Real-time, low-bandwidth 3D range video commun...

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2019 3d Image Measurement and data processing Conference, 3dMP 2019

作者： Bell, Tyler Zhang, Song Department of Electrical and Computer Engineering University of Iowa Iowa CityIA52242 United States School of Mechanical Engineering Purdue University West LafayetteIN47907 United States

An increasing number of mobile devices are equipped to acquire 3d range data along with color texture (e.g., iPhone X). As these devices are adopted, more people will have direct access to 3d imaging devices, bringing advanced applications, such as mobile 3d video calls and remote 3d telemedicine, within reach. This paper introduces Holo Reality, a novel platform that enables real-time, wireless 3d video communications to and from today's mobile (e.g., iPhone, iPad) devices. The major contributions are (1) a modular platform for performing 3d video acquisition, encoding, compression, transmission, decompression, and visualization entirely on consumer mobile devices and (2) a demonstration system that successfully delivered 3d video content from one mobile device to another, in real-time, over standard wireless networks. Our demonstration system uses augmented reality to visualize received 3d video content within the user's natural environment, highlighting the platform's potential to enable advanced applications for telepresence and telecollaboration. This technology also has the potential to realize new applications within areas such as mechatronics and telemedicine. © 2019, Society for Imaging Science and Technology

关键词： Smartphones

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Exploration and Aspects on Augmented Reality 3

Exploration and Aspects on Augmented Reality

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3rd international Conference on Power, Energy, Control and transmission Systems, ICPECTS 2022

作者： Sarkar, Swagata Adhish, S. Adarsh, V. divakar, K. Sri Sai Ram Engineering College Dept. Artificial Intelligence and Data Science Tamil Nadu Chennai India Sri Sai Ram Engineering College B.Tech Artificial Intelligence and Data Science Tamil Nadu Chennai India

ISBN: (纸本)9781665462754

Augmented Reality (AR) is a collaborative experience of a physical world environment along with 3d virtual objects. Augmented Reality allows the user to interact with the virtual objects created in the real world. A device must be capable of calculating the position and orientation of virtual objects with respect to other physical objects for displaying AR content. This is one of the emerging technologies in today's world. Augmented Reality has become popular in various domains. Various applications of AR include prototyping, Sales and marketing, Gaming, health care, etc. A device that generates AR will combine the real world and virtual objects and provide concluded meanings for the user. The combination of AR with other technologies such as Computer Vision, Artificial Intelligence, IoT, Natural Language processing takes the technology to another level. The evolution of mobile apps helped in the spread of AR among people. The main objective of this paper is to review various aspects of Augmented Reality, its applications along with advantages and challenges faced by it. © 2022 IEEE.

关键词： Augmented reality

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Some unusual ways of visually sensing 3d shapes

Some unusual ways of visually sensing 3d shapes

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international symposium on 3d data processing visualization and transmission

作者： V. Brajovic

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Queueing theoretic optimal scheduling for multiple input multiple output multiple access channel 3

Queueing theoretic optimal scheduling for multiple input mul...

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3rd IEEE international symposium on Signal processing and Information Technology

作者： Boche, H Wiczanowski, M Tech Univ Berlin Fac EECS Heinrich Hertz Chair Mobile Commun Technol D-10587 Berlin Germany

ISBN: (纸本)0780382927

In the framework of new services in wireless networks beyond the third generation, asymmetric and flexible uplink transmission schemes are highly desirable. Hence, especially in "data only" networks, an efficient uplink scheduling must not be neglected in the network design. Although not yet well covered in the literature, this area appears to gain importance especially in the face of high speed uplink packet access (HSUPA) radio link design for future wireless systems. In this work we study an uplink scheduling scheme from the information theoretic and queueing theoretic point of view. The objective of the cross-layer [2] scheduling approach we present is the stability of bit-queues awaiting their transmission at every user node. With this approach is associated an optimization problem of maximizing the weighted sum of rates, where the weights express the intensity of packet-traffics at every user node. An important property characterizing our approach is considering only spatial channelization of users, i.e. allocating user signals within one succesive interference cancellation (SIC) order fixed over a certain time interval T. We show, that despite this neglection of time sharing technique, it is possible to achieve an overall optimal stability achieving scheduling for every set of user rate weights. Furthermore, we show that the choice of the SIC-order allowing for the optimal scheduling is independent of user channels and that the associated optimization problem over transmit covariance matrices is convex.

关键词： Covariance matrix Interference cancellation MIMO Optimal scheduling Queueing analysis Radio link Silicon carbide Stability Time sharing computer systems Wireless networks

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Real Time transmission of Cultural Heritage 3d Survey in Case of Emergency

Real Time Transmission of Cultural Heritage 3D Survey in Cas...

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3rd international Conference on Information and Communication Technologies for disaster Management (ICT-dM)

作者： d'Auria, S. Luglio, M. Roseti, C. Strollo, R. M. Zampognaro, F. Univ Roma Tor Vergata Via Politecn 1 I-00133 Rome Italy

ISBN: (纸本)9781509052349

In case of an emergency event (e.g., earthquake, storm, flood) cultural heritage and archeological monuments must be particularly cared because of their inestimable value and the intrinsic greater fragility. Morphological surveys must be executed immediately for quick identification of damages so that the needed operations can be planned and performed in the shortest timeframe. The survey, to be accurate and useful to the aim, must use the most modern technologies (laser scanner, 4k video, high resolution pictures) but, considering the hostility of the environment, to process all the surveyed data on site in real time is practically impossible. Thus, a very efficient telecommunication system based on multiple segments and QoS assurance must be set up to send the collected data in real time to a remote location, equipped with powerful processing capability and adequate staff to perform evaluations and to provide support to decisions. This paper describes a project idea that analyzes the survey methodology and the technical feasibility of the telecommunication network.

关键词： cultural heritage hybrid networks laser scanning network optimization 3d survey photogrammetry

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Color, fusion, and stereopsis

Color, fusion, and stereopsis

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international symposium on 3d data processing visualization and transmission

作者： A. dobbins

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