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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301-310 订阅

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Power-efficient sensor placement and transmission structure for data gathering under distortion constraints

Power-efficient sensor placement and transmission structure ...

引用

3rd international symposium on Information processing in Sensor Networks

作者： Ganesan, d Cristescu, R Beferull-Lozano, B Univ Calif Los Angeles Dept Comp Sci Los Angeles CA 90095 USA

ISBN: (纸本)1581138466

We consider the joint optimization of sensor placement and transmission structure for data gathering, where a given number of nodes need to be placed in a field such that the sensed data can be reconstructed at a sink within specified distortion bounds while minimizing the energy consumed for communication. We assume that the nodes use joint entropy coding based on explicit communication between sensor nodes, and consider both maximum and average distortion bounds. The optimization is complex since it involves an interplay between the spaces of possible transmission structures given radio reachability limitations, and feasible placements satisfying distortion bounds. We address this problem by first looking at the simplified problem of optimal placement in the one-dimensional case. An analytical solution is derived for the case when there is a simple aggregation scheme, and numerical results are provided for the cases when joint entropy encoding is used. We use the insight from our 1-d analysis to extend our results to the 2-d case, and show that our algorithm for two-dimensional placement and transmission structure provides significant power benefit over a commonly used combination of uniformly random placement and shortest path trees.

关键词： sensor networks data gathering information theory sensor node placement energy efficiency sensing distortion

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PAM-4 data transmission Quality Evaluation Using Two- and Three-dimensional Mapping of Received Symbols 53

PAM-4 Data Transmission Quality Evaluation Using Two- and Th...

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53rd IEEE international symposium on Multiple-Valued Logic, ISMVL 2023

作者： Yuminaka, Yasushi Nakajima, Kazuharu Iijima, Yosuke Gunma University Graduate School of Science and Technology Kiryu Japan Oyama Japan

ISBN: (纸本)9781665464161

Based on four-level pulse-amplitude modulation (PAM-4) symbol transition, this study investigated a two-dimensional (2d) symbol mapping technique that evaluates the quality of transmission data to set equalizer parameters adaptively. The 2d symbol transition mapping enables visualization of the degree of intersymbol interference (ISI). The simulation results demonstrate that the 2d symbol mapping can evaluate the PAM-4 data transmission quality degraded by ISI and can visualize the effect of equalization. The applications of 2d mapping and the extension of 2d mapping to 3d mapping are also discussed. © 2023 IEEE.

关键词： Intersymbol interference

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Smart 3d visualizations in clinical applications

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3rd international symposium on Smart Graphics, SG 2003

作者： Preim, Bernhard Peitgen, Heinz-Otto Institute for Simulation and Graphics Department for Computer Science Otto-von-Guericke-University of Magdeburg Universitaetsplatz 2 Magdeburg39106 Germany Center for Medical Diagnosic Systems and Visualization Universitaetsallee 29 Bremen28359 Germany

ISBN: (纸本)3540405577

We discuss techniques for the visualization of medical volume data dedicated for their clinical use. We describe the need for rapid dynamic interaction facilities with such visualizations and discuss emphasis techniques in more detail. Another crucial aspect of medical visualization is the integration of 2d and 3d visualizations. In order to organize this discussion, we introduce 6 „Golden"rules for medical visualizations. © Springer-Verlag Berlin Heidelberg 2003.

关键词： visualization

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EU-TeleInViVo: An integrated portable telemedicine workstation featuring acquisition, processing and transmission over low-bandwidth lines of 3d ultrasound volume images

EU-TeleInViVo: An integrated portable telemedicine workstati...

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Joint Meeting of the 3rd IEEE EMBS international Conference on Information Technology Applications in Biomedicine/3rd Workshop of the Int-Telemedical-Information-Society

作者： Kontaxakis, G Walter, S Sakas, G Tech Univ Madrid Dept Elect Engn E-28040 Madrid Spain

ISBN: (纸本)078036449X

A transportable telemedicine workstation has been designed, developed and evaluated for use in isolated areas such as islands, rural areas and crisis situation areas. The EU-TelelnViVo is a custom-made device integrating in one solid case: a portable PC with telecommunication capabilities and a light, portable 3d ultrasound station. The device is now being tested in different socioeconomic conditions and adjusted accordingly to meet needs of developing countries and countries in transition. It currently comes in two versions, one fully portable, self-containing device, and a workstation version (PC attached to an ultrasound scanner for internal hospital use). A dedicated software package has been developed for the needs of this project, based on the In-VIVo ScanNT software package developed at Fraunhofer IGd. during a teleconsultation both partners, connected over a telecommunications network, are able to share the same interface and perform tasks visible in real-time, even on low bandwidth channels, to both ends on the same data set. The system supports various ways communication, such as Internet, ISdN, common phone lines, GSM, etc.

关键词： telemedicine teleconsultation 3d freehand ultrasound interface sharing portable workstation

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design and Implementation of Global 3d visualization Client Program on Intelligent Mobile devices

Design and Implementation of Global 3D Visualization Client ...

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3rd international Conference on Multimedia and Ubiquitous Engineering

作者： Sun, X. Hu, Qing W. Wu, Hua Y. Wuhan Univ Coll Remote Sensing & Informat Technol Wuhan 430072 Peoples R China Wuhan Univ Mapping & Remote Sensing State Key Lab Informat Engn Surveying Wuhan Peoples R China

ISBN: (纸本)9780769536583

Because of the limited computational resources and narrow wireless network bandwidth, it's a great challenge to realize the similar effect of smooth roaming operations in 3d environment as Google Earth on the platform of mobile devices. Based on the researches of the characteristics of embedded systems, we used technologies of roaming step length control, motion blur, and triangle strips division to improve the efficiency of 3d rendering. And by means of local storage and minimized updating, we successfully found the balance between limited storage resources and narrow wireless network bandwidth. At last, our adoption of dynamic caching and asynchronous refreshment strategy effectively resolved the conflict between the speed and space limit in embedded systems. Finally, based on the methodologies, we implemented an experimental application program on the client side, and the experiment result proved the high efficiencies of roaming operations and wireless network data transmission.

关键词： Virtual Globe Mobile devic LBS(Location Based Service) Wireless Network

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New particle identification method for 3d PTV

New particle identification method for 3D PTV

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3rd Triennial international symposium on Fluid Control, Measurement, and visualization - FLUCOME '91

作者： Yamamoto, Fujio Tian, Huai Zhang Uemura, Tomomasa Ohmi, Kazuo Iguchi, Manabu Koukawa, Mitsuo Fukui Univ Fukui Japan

ISBN: (纸本)0791806529

The present study deals with a new method of the particle identifications in a three dimensional particle tracking velocimetry (3d PTV) using binary image pictures. The purpose is to show that the method has a high performance of particle identification between two spaces at a short time interval. It is based on both the necessary condition for the particle identification and the 3d cross correlation method for evaluation of the similarity of particle distribution patterns between the two spaces. Computer simulation experiments are carried out using two models of 3d rotating axisymmetric flow and 3d unsteady viscous doublet flow to investigate the effects of sizes of particles, search subregions and identification subregions on the performance of particle identification. The method has the two strong points: One is a quick and high efficiency performance of particle identification and the other is that memory size of computer required for the computation of particle identification might be smaller in comparison with the other method, because the method does not need data about shape, color, and size of particles but coordinates of particle centers.

关键词： Flow of Fluids

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Optical-ultrasound data processing for hybrid 3d vision on air

Optical-ultrasound data processing for hybrid 3D vision on a...

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作者： Llata, Jose R. Torre-Ferrero, Carlos Sarabia, Esther G. Robla, Sandra Electronic Technology and Control Systems Department University of Cantabria Avda. De los Castros s/n. 39005 Santander Cantabria Spain

ISBN: (纸本)9789604741472

This work explores an approach for obtaining three-dimensional scene representation by using optical and ultrasonic information. It combines a set of three-dimensional data obtained by air-transmission ultrasonic sensors, using the echo-pulse method, with a set of three-dimensional data captured by stereo vision or active triangulation techniques. Both data sets are 3d point clouds which are fused in order to get a hybrid depth map with three-dimensional information about the scene of interest. Because hybrid images contain not only visual information but also ultrasonic information they can be useful for scenarios with poor illumination, with special optical properties or even with transparent elements.

关键词： Stereo image processing

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deep Learning based Segmentation for Assessment of Fractional Limb Volume in 3d Fetal Ultrasound Imaging

Deep Learning based Segmentation for Assessment of Fractiona...

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IEEE international Ultrasonics symposium (IUS)

作者： Pardasani, Rohit Auchar, Hrithik Goel, Mansi GE Healthcare Patient Care Solut Tech Digital Bangalore India GE Healthcare Digital Enterprise Data Management Bangalore India

ISBN: (数字)9781665466578

ISBN: (纸本)9781665466578

Fractional limb volume is a fetal soft tissue parameter that can be estimated from the 3d ultrasonography during 2nd and 3rd trimester of the gestation period. This parameter has a significant value in assessment of fetal weight, growth and nutritional status. The calculation of fractional limb volume from 3d ultrasound scans involves segmenting limb 2d cross-section images. This work explores convolutional neural network based segmentation models for this task and compares their performance. The three models viz. attention Unet, a Unet style model with Xception convolution and feature pyramid network are evaluated based on their performance on dataset consisting of slices from 65 volumes. The results indicate that feature pyramid network marginally outperforms the other two models with average validation dice coefficient as 0.9006. The experiments also show that the performance of all models can be improved through basic post-processing of output mask.

关键词： fractional limb volume deep learning segmentation ultrasound convolutional neural network

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Effective Representation gf Three-dimension Nodules for False-Positive Reduction in Pulmonary Nodule detection 3

Effective Representation gf Three-Dimension Nodules for Fals...

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3rd international symposium on Image Computing and digital Medicine (ISICdM)

作者： Guo, Wei Pratama, AdevianFairuz Gong, Zhaoxuan Zhou, Wei Zhao, dazhe Zhang, Guodong Shenyang Aerosp Univ Daoyi South St 37 Shenyang 110136 Liaoning Peoples R China Minist Educ Key Lab Intelligent Comp Med Image Culture RdHeping Dist 11 Shenyang 110819 Liaoning Peoples R China Northeastern Univ Sch Comp Sci & Engn Shenyang 110014 Liaoning Peoples R China

ISBN: (纸本)9781450372626

The convolutional neural networks (CNNs) can learn features representation from large amounts of training data, and it has achieved remarkable successes in image processing. However, due to expensive expert annotation and privacy issues, the lack of sufficient training data limits the application of CNNs, especially for 3d CNNs, in medical images. In this paper, we decomposed a 3d sample into a set of 2d images based on a series of sequential uniformly-distributed viewpoints and used some "effective" 2d images of them to train a 2d CNN for the false-positive reduction in pulmonary nodule detection with fewer model parameters and less computational burden. The 2d images from different representative viewpoints would provide more complete and independent information than simplifying a 3d nodule into several orthogonal planes. And the non-nodules appear clearly as non-circular linear structures in the "effective" 2d images, which enable us well to distinguish nodules from false positives. Our method was evaluated on 888 CT scans from the database of the LUNA16 challenge. Compared with other methods by using 2d CNNs, our proposed method achieves the highest competition performance metric (CPM) score in the false-positive reduction track. Compared to published work using 3d CNNs which needs significantly larger training data, our method achieves comparable performance by using only about 20% of training data. The "effective" 2d images from representative viewpoints augment the database for training a 2d CNN and provide more crucial information of 3d nodules and would improve the performance of false-positive reduction..

关键词： False-positive reduction Effective representation of a 3d nodule 2d convolutional neural networks

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Mine information system based on 3d geological modeling

Mine information system based on 3D geological modeling

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作者： Hu, Jinhu Wan, Na Institute Resources and Environment North China University of Water Conservancy and Electric Power Zhengzhou China Department of Earthquake Disaster Prevention Earthquake Administrator of Henan Province Zhengzhou China

ISBN: (纸本)9780769543604

The nature geological features of mine, such as ore body, terrane, cracked belt caused by rupture, and tunnel, goaf, etc., are one real 3d dynamic geography and geologic environment. The production and organization activity of mine are all in real 3d environment. It is essential that utilizing the computer-based digitization technology to model all kinds of geologic conditions and paroxysmal accident encountering in the mining and digging course. Building 3d geological model, it is of far reaching importance for the design and construction during the process of mine building, for the dynamic management of numerous and jumbled engineering geology material during excavating production and administrative procedure, for improving the data visualization degree, for advancing work efficiency greatly, and for safety in production of mine. The concept of digital strata is proposed to solve such problems. Based on the aim above, that is to build the mine information system, we design the system frame. From the bottom data management to higher level of analyses and application, the frame is divided into four layers: data management layer, model layer, spatial analysis layer, and application layer. © 2010 IEEE.

关键词： Information management

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