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检索条件"任意字段=International Conference on Computer Graphics, Imaging and Visualization"

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Hierarchical Location-Based Services for Wireless Sensor Networks

Hierarchical Location-Based Services for Wireless Sensor Net...

引用

international conference on computer graphics, imaging and visualization, CGIV

作者： Rania Khadim Mohammed Erritali Abdelhakim Maaden Laboratory of Mathematics and Applications Faculty of Sciences and Techniques Sultan Moulay Slimane University Beni Mellal Morocco Departement of Computer Sciences TIAD laboratory

Nowadays Wireless Sensor Networks have attracted worldwide research and industrial interest, because they can be applied in various areas. Geographic routing protocols are very suitable to wireless sensor networks because they use location information when they need to route packets. Obviously, location information is maintained by Location-Based Services provided by network nodes in a distributed way. The location based services can be classified into two classes: Flooding-Based and Rendezvous-based location *** this paper we choose to compare two hierarchical rendezvous location based-services, GLS (Grid Location Service) and HLS (Hierarchical Location Service) coupled to the GPSR routing protocol (Greedy Perimeter Stateless Routing).The simulations were performed using NS2 simulator for wireless sensor networks to evaluate the performance and power of the two services in term of location overhead, the request travel time (RTT) and the query Success ratio (QSR).This work presents also the scalability performance study of both GLS and HLS, specifically, what happens if the number of nodes N increases. The study will focus on three qualitative metrics: The location maintenance cost,the location query cost and the storage cost.

关键词： Servers Routing protocols Mobile radio mobility management Wireless sensor networks Scalability Measurement Maintenance engineering

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3rd international computer Science conference, ICSC 1995

引用

3rd international computer Science conference, ICSC 1995

ISBN: (纸本)9783540606970

The proceedings contain 79 papers. The special focus in this conference is on Robot Navigation, Tracking and Scientific visualization. The topics include: computer vision meets computer graphics;autonomous mobile robot navigation using fish-eye lenses;high-performance tracking system;a 3D predictive visual tracker for tracking multiple moving objects with a stereo vision system;vision guided circumnavigating autonomous robots;force-driven optimization for correspondence establishmen;a visualization technique for 3D velocity vector field;interactive particle tracing algorithm for unstructured grids;fast resampling using vector quasltization;a B-spline surface interpolation technique for reconstructing 3D objects from serial arbitrary shaped planar contours;two methods for a reliable comer detection in 2D images;on the deletability of points in 3D thinning;real-time textured object recognition on distributed systems;off-line signature verification without requiring random forgeries for training;noisy subsequence recognition using constrained swing editing involving substitutions, insertions, deletions and generalized transpositions;a geometrical editor for fold formation;simplification of polygonal surface with attributes;reducing polygonal data by structural grouping algorithm;an object-oriented architecture for chinese character composition;recognizing the courtesy amount;an automatic extraction approach of road information on the basis of recognition of character regions;a logic-based, object-oriented approach;on-line chinese character recognition with attributed relational graph matching;on-line handwritten alphanmneric character recognition using feature sequences;an adaptive supersampling method;dynamic memory mapping for window based display system and convert non-convex meshes to convex meshes for depth sorting in volume rendering.

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Human-centered Evaluation of 3D Radial Layouts for Centrality visualization 30

Human-centered Evaluation of 3D Radial Layouts for Centralit...

引用

30th international conference in Central Europe on computer graphics, visualization and computer Vision, WSCG 2022

作者： Kobina, Piriziwè Duval, Thierry Brisson, Laurent David, Anthony IMT Atlantique Lab-STICC UMR CNRS 6285 BrestF-29238 France

ISBN: (纸本)9788086943336

In this paper we propose improvements to the 3D radial layouts that make it possible to visualize centrality measures of the nodes in a graph. Our improvements mainly relate edge drawing and the evaluation of the 3D radial layouts. First, we projected not only the nodes but also the edges onto the visualization surfaces in order to reduce the node overlap that could be observed in previous 3D radial layouts. Secondly, we proposed a human-centered evaluation in order to compare the efficiency score and the time to complete tasks of the 3D radial layouts to those of the 2D radial layouts. The evaluation tasks proposed are related to the central nodes, the peripheral nodes and the dense areas of a graph. The results showed that 3D layouts can perform significantly better than 2D layouts in terms of efficiency when tasks are related to the central and peripheral nodes, while the difference in time is not statistically significant between these various layouts. Additionally, we found that the participants preferred interacting with 3D layouts over 2D layouts. © 2022 University of West Bohemia. All rights reserved.

关键词： visualization

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visualization of Individual's Knowledge by Analyzing the Citation Networks

Visualization of Individual's Knowledge by Analyzing the Cit...

引用

international conference on computer graphics, imaging and visualization, CGIV

作者： Tze-Haw Huang Mao Lin Huang Faculty of Information Technology University of Technology Sydney Australia

Visual analysis of knowledge domain is an emerging field of study as science is highly dynamic and constantly evolving. Behind the scene, a knowledge domain is formed and contributed by enormous researchers' publications that describe the common subject of the domain. There is large number of significant activities have been carried out to visualize and identify the knowledge domains of research projects, groups and communities. However, the research on visualizing the knowledge structure at individual level is relative inactive. It is difficult to track down the individual's contribution to the subject and the degree of the knowledge they possess. In this paper, we are attempting to visualize the individual's knowledge structure by analyzing the citation and co-authorship relational structures. We try to analyze and map author's documents to the knowledge domains. By mapping the documents to knowledge domain, we obtain the skeleton of knowledge structure of an individual. Then, we apply the visualization technique to present the result.

关键词： Citation analysis Information analysis Data visualization Skeleton Information technology Australia Layout Internet Search engines Knowledge acquisition

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Three-dimensional microwave imaging for breast cancer detection based on forward-backward time-stepping and Tikhonov's regularization methods

Three-dimensional microwave imaging for breast cancer detect...

引用

2010 IEEE 12th international conference on Communication Technology, ICCT'2010

作者： Liu, Guangdong Zhang, Yerong College of Electronic Science and Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China

ISBN: (纸本)9781424468690

We develop a three-dimensional (3-D) microwave imaging technique, which is extended from the forward-backward time-stepping (FBTS) algorithm and the Tikhonov's regularization approach, to determine the sizes and positions of tumors within breast. The effectiveness of reconstructing quantitatively of breast composition using the presented technique is demonstrated by a numerical example based on a 3-D simplified breast model. The finite-difference time-domain (FDTD) method is applied to simulate the measured, the forward and backward calculated electromagnetic fields. © 2010 IEEE.

关键词： Three dimensional computer graphics

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A Statistical Image Retrieval Method Using Color Invariant

A Statistical Image Retrieval Method Using Color Invariant

引用

international conference on computer graphics, imaging and visualization, CGIV

作者： Cheng Jin Department of Computer Science and Engineering Shanghai Jiaotong University China

Content based image retrieval is an essential task in many image processing applications, among which, color based methods have been receiving constant attentions in past years, because color information is a discriminative descriptor for image retrieval, especially in case of large database. A limitation of previous color based methods is their unsuitability for retrieving similar scenes under varying lighting conditions as color is sensitive to illuminations. Besides image descriptors of some existing methods are with large dimensionality and thus computational expensive. As betterment, an adaptive method is proposed in this paper, which integrates the color invariant with some spatial information of images. Different from previous work, the number of states during the quantization of the color space is not manually determined. Instead, it depends on the context of the image itself, using an adaptive clustering technique: Firstly, feature map consisting of color invariants is established for images. Secondly, the Markov chain model is employed to capture the image both color and spatial information. Thirdly, an image descriptor is computed for each image, not under the frame of the entire fixed color space. To practice our method, similar images are retrieved with a similarity measure based on a two-stage weighted distance. Experiments show that, this method has improved simplicity and compactness without the lost of efficiency and robustness.

关键词： Image retrieval Information retrieval Content based retrieval Color Image processing Image databases Layout Lighting Quantization Robustness

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Analysis of Driving Session Videos by Reverse Temporal Order Processing

Analysis of Driving Session Videos by Reverse Temporal Order...

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international conference on computer graphics, imaging and visualization, CGIV

作者： F. Maire A. Rakotonirainy School of SEDC-Faculty of IT Queensland University of Technology Brisbane Australia NICTA Brisbane QLD Australia Centre of Accident Research and Road Safety Queensland Faculty of Health Queensland University of Technology Australia

Technology based driver training is still in its infancy. There is a strong need for improved and integrated computer-based screening tools in order to facilitate objective and reliable driver training assessments. This paper describes a system that analyses videos of driving sessions collected by on-board Web-cameras. The system detects and tracks lane markings in order to estimate the relative position of the vehicle with respect to its lane. The system is computationally efficient as it exploits fully the off-line nature of the data. The analysis of the video recording is performed in reverse temporal order. The benefits of this approach compared to the forward analysis traditionally used are an improved robustness and a lower computational cost

关键词： Videos Australia Vehicle crash testing computer crashes Road safety Vehicle driving Road vehicles Aging Road accidents Vehicle detection

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Hybrid pyramidal/vector-quantized volume compression

Hybrid pyramidal/vector-quantized volume compression

引用

conference on Three-Dimensional Image Capture

作者： Desai, R Menon, J Univ. of Texas/Austin (United States) IBM Thomas J. Watson Research Ctr. (United States)

ISBN: (纸本)081942434X

Compression and decompression of volume data is gaining increasing importance, especially with wide use of volume visualization techniques in distributed environments, Hitherto researchers have used direct extensions of still-image and video compression techniques to volume data, but these are associated with limitations of scalar quantization, We present an Orientation Band (ORE) technique for volume compression that exploits orientation information, and consequently preserves structure within the data. The ORB scheme uses a hybrid of lossless (pyramidal) and lossy (vector quantized) techniques to compress within user-specified space and error bounds. The resulting compressed volumes are suited for progressive network transmission and for fast volume rendering.

关键词： Image compression computer programming Video compression visualization 3D video compression Quantization 3D image processing Video Volume visualization Signal to noise ratio

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international conference on computer graphics, Artificial Intelligence, and Data Processing, ICCAID 2022

International Conference on Computer Graphics, Artificial In...

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2022 international conference on computer graphics, Artificial Intelligence, and Data Processing, ICCAID 2022

ISBN: (纸本)9781510663350

The proceedings contain 174 papers. The topics discussed include: modeling of stereoscopic images in 3D environmental art design;a path planning method for unmanned surface vehicles based on Riemannian geometry;lateral stability analysis and equivalent circuit simulation of double-axis bogie;fine-grained insulator defect detection method based on vision-transformer;the optimal path of new media city image communication strategy based on data mining technology;research on target grid investment optimization technology of medium- and low-voltage distribution network based on improved genetic algorithm;construction of multi-variety combination trading model for electricity market;prediction of highway pavement performance based on combined model;research on denoising of skinned point cloud based on multi-feature point parameter weight optimization;electricity retail market package decision model based on electricity consumption characteristics;and implementation and visualization of weighted A-star algorithm and bidirectional weighted A-star algorithm under large-scale road network.

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3D visualization of airport ground information

3D visualization of airport ground information

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2003 Summer computer Simulation conference, SCSC 2003

作者： Xiaoyong, Lei Shuling, Dai Xingren, Wang Dept. of Automatic Control Beijing University of Aeronautics and Astronautics Beijing 100083 China

ISBN: (纸本)1565552687

Comparing to traditional text/table ground information representation and graphics workstation, the 3D visualization of Airport Ground Information System (AGI-VR system) is PC-based and exploits the advent of modern PC-based 3D real-time computer image generation (CIG) technology. It converts dynamic and complex airport ground information, including aircraft type, airline, arrival/departure time, flight number, source/destination, berthing bay and all kinds of building such as tower, meteorological observatory, runway, light, etc., into real-time, realistic visual representation. This can give the ground staff intuitive information about airport ground state and these states are updated via real-time database. This method makes the ground information under a real-time supervision, management and scheduling. More than 1 year no-error running in the part of ground information in Beijing Capital international Airport (BCIA) proves that applying VR technology into airport ground information management is a more efficient, more effective and more economic (3E) strategy than traditional text-based database query system and should extend to all around airport system as well as ground information.

关键词： visualization

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