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检索条件"机构=Institute of Engineering and Computer Graphics"

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Exploring 3D Reconstruction with Drone Images: Advances and Challenges in Urban Environments 50

Exploring 3D Reconstruction with Drone Images: Advances and ...

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50th Annual Conference of the IEEE Industrial Electronics Society, IECON 2024

作者： Miranda Baldivieso, Thiago João da Silva Batista, Taise Grazielle Chagas, Fabio Suim Rodrigues Velho, Luiz Carlos Pacheco Ferreira Rosa, Paulo Fernando Defense Engineering Graduate Program Military Institute of Engineering Rio de Janeiro Brazil State Institute of the Environment Inea RJ Rio de Janeiro Brazil Department of Science and Industry systems University of South-Eastern Norway Kongsberg Norway Department of Computer Graphics Institute for Pure and Applied Mathematics Rio de Janeiro Brazil Electrical Engineering Graduate Program Military Institute of Engineering Rio de Janeiro Brazil

ISBN: (纸本)9781665464543

This working-in-progress paper aims to present a three-dimensional reconstruction using aerial images in different environments. The experiments were conducted with aircraft in both external and internal settings, starting with image acquisition, followed by the application of specific photogrammetry software-both commercial and open-source-and concluding with a qualitative evaluation of the results. © 2024 IEEE.

关键词： Aerial photography

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An effective load balancing scheme for 3D texture-based sort-last parallel volume rendering on GPU clusters

An effective load balancing scheme for 3D texture-based sort...

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作者： Lee, Won-Jong Srini, Vason P. Park, Woo-Chan Muraki, Shigeru Han, Tack-Don Department of Computer Science Yonsei University Seoul Korea Republic of Department of Computer Science and Engineering Information and Communications University Deajeon Korea Republic of Department of Internet Engineering Sejong University Seoul Korea Republic of Collaborative Research Team of Volume Graphics National Institute of Advanced Industrial Science and Technology Tokyo 135-0064 Japan

We present an adaptive dynamic load balancing scheme for 3D texture based sort-last parallel volume rendering on a PC cluster equipped with GPUs. Our scheme exploits not only task parallelism but also data parallelism during rendering by combining the hierarchical data structures (octree and parallel BSP tree) in order to skip empty regions and distribute proper workloads to rendering nodes. Our scheme can also conduct a valid parallel rendering and image compositing in visibility order by employing a 3D clustering algorithm. To alleviate the imbalance when the transfer function is changed, a load rebalancing is inexpensively supported by exchanging only needed data. A detailed performance analysis is provided and scaling characteristics of our scheme are discussed. These show that our scheme can achieve significant performance gains by increasing parallelism and decreasing synchronizing costs compared to the traditional static distribution schemes. Copyright © 2008 The institute of Electronics, Information and Communication Engineers.

关键词： Volume rendering

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Solving planning and scheduling problems for web supported plant chains using hierarchical concepts in Ant Colony Optimization

Solving planning and scheduling problems for web supported p...

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12th ISPE International Conference on Concurrent engineering: Research and Applications - Next Generation Concurrent engineering: Smart and Concurrent Integration of Product Data, Services, and Control Strategies, CE 2005

作者： Karunakaran, K.P. Dashora, Yogesh Tiwari, M.K. Dwivedi, S.N. Department of Mechanical Engineering Computer Graphics Laboratory Indian Institute of Technology Powai Bombay-400076 India Department of Manufacturing Engineering National Institute of Foundry and Forge Technology Ranchi-834003 India Department of Forge Technology National Institute of Foundry and Forge Technology Ranchi-834003 India Department of Mechanical Engineering University of Louisiana at Lafayette Lafayette LA 70504 United States

The past decade has witnessed remarkable changes in management and linkage issues, especially pertaining to plant chains. And although Concurrent engineering (CE) principles have been utilized widely in the formulation of web-supported plant chains (WSPCs), they are challenged by the intricacies involved in implementation issues. This paper attempts to resolve the concurrent planning and scheduling (CPAS) aspects of WSPCs. A new Algorithm of Hierarchical Ants (AHA) is being proposed here, in order to solve the CPAS problem optimally. This algorithm takes its governing traits from the Ant Colony Optimization (ACO). The algorithm is marked by cooperation among colonies that work in a hierarchical manner, so as to make it compatible to any problems characterized by successive decisions. Robustness of the proposed algorithm is authenticated by solving problems of varying dimension and then is simulated to map the industrial data, after which results are compared with an established GA-based strategy. © 2005 ISPE, Inc.

关键词： Concurrent engineering

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Genetic Programming 1

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丛书名： Lecture Notes in computer Science

1000年

作者： Krzysztof Krawiec Alberto Moraglio Ting Hu A. Şima Etaner-Uyar Bin Hu

ISBN: (数字)9783642372070

ISBN: (纸本)9783642372063

This book constitutes the refereed proceedings of the 16th European Conference on Genetic Programming, EuroGP 2013, held in Vienna, Austria, in April 2013 co-located with the Evo* 2013 events, EvoMUSART, EvoCOP, EvoBIO, and EvoApplications.;The 18 revised full papers presented together with 5 poster papers were carefully reviewed and selected from 47 submissions. The wide range of topics in this volume reflects the current state of research in the field, including different genres of GP (tree-based, linear, grammar-based, Cartesian), theory, novel operators, and applications.

关键词： Algorithm Analysis and Problem Complexity Computation by Abstract Devices Artificial Intelligence computer Applications

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CHANTI: Predictive text entry using Non-verbal Vocal Input 11

CHANTI: Predictive text entry using Non-verbal Vocal Input

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Proceedings of the SIGCHI Conference on Human Factors in Computing Systems

作者： Sporka, Adam J. Felzer, Torsten Kurniawan, Sri H. Poláček, Ondřej Haiduk, Paul MacKenzie, I. Scott Department of Computer Graphics and Interaction Faculty of Electrical Engineering Czech Technical University in Prague Prague Czech Republic Institute for Mechatronic Systems Technische Universität Darmstadt Darmstadt Germany Department of Computer Engineering University of California Santa Cruz Santa Cruz CA United States Department of Psychology Technische Universität Darmstadt Darmstadt Germany Department of Computer Science and Engineering York University Toronto ON Canada

ISBN: (纸本)9781450302289

This paper introduces a text entry application for users with physical disabilities who cannot utilize a manual keyboard. The system allows the user to enter text hands-free, with the help of "Non-verbal Vocal Input" (e.g., humming or whistling). To keep the number of input sounds small, an ambiguous keyboard is used. As the user makes a sequence of sounds, each representing a subset of the alphabet, the program searches for matches in a dictionary. As a model for the system, the scanning-based application QANTI was redesigned and adapted to accept the alternative input signals. The usability of the software was investigated in an international longitudinal study done at locations in the Czech Republic, Germany, and the United States. Eight test users were recruited from the target community. The users differed in the level of speech impairment. Three users did not complete the study due to the severity of their impairment. By the end of the experiment, the users were able to enter text at rates between 10 and 15 characters per minute. Copyright 2011 ACM.

关键词： Human computer interaction

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Authenticating Users Through Fine-Grained Channel Information

Authenticating Users Through Fine-Grained Channel Informatio...

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作者： Liu, Hongbo Wang, Yan Liu, Jian Yang, Jie Chen, Yingying Poor, H. Vincent Department of Computer Information and Graphics Technology Indiana University-Purdue University Indianapolis IndianapolisIN46222 United States Department of Electrical and Computer Engineering Stevens Institute of Technology HobokenNJ07030 United States Department of Computer Science Florida State University TallahasseeFL32306 United States Department of Electrical Engineering Princeton University PrincetonNJ08544 United States

User authentication is the critical first step in detecting identity-based attacks and preventing subsequent malicious attacks. However, the increasingly dynamic mobile environments make it harder to always apply cryptographic-based methods for user authentication due to their infrastructural and key management overhead. Exploiting non-cryptographic based techniques grounded on physical layer properties to perform user authentication appears promising. In this work, the use of channel state information (CSI), which is available from off-the-shelf WiFi devices, to perform fine-grained user authentication is explored. Particularly, a user-authentication framework that can work with both stationary and mobile users is proposed. When the user is stationary, the proposed framework builds a user profile for user authentication that is resilient to the presence of a spoofer. The proposed machine learning based user-authentication techniques can distinguish between two users even when they possess similar signal fingerprints and detect the existence of a spoofer. When the user is mobile, it is proposed to detect the presence of a spoofer by examining the temporal correlation of CSI measurements. Both office building and apartment environments show that the proposed framework can filter out signal outliers and achieve higher authentication accuracy compared with existing approaches using received signal strength (RSS). © 2017 IEEE.

关键词： Channel state information

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Rate-distortion optimized interactive browsing of JPEG2000 images

Rate-distortion optimized interactive browsing of JPEG2000 i...

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IEEE International Conference on Image Processing

作者： D. Taubman R. Rosenbaum School of Electrical Engineering and Telecommunications The University of NSW Sydney Institute of Computer Graphics University of Rostock Germany

This paper is concerned with remote browsing of JPEG2000 compressed imagery. A potentially interactive client identifies a region and maximum resolution of interest. The server responds by sending information from the JPEG2000 code-stream which is relevant to this region and resolution. We propose an algorithm for sequencing data from the original code-stream in such a way as to maximize the received image quality within the region of interest, at each point in the transmission. The proposed R-D optimal sequencing algorithm is demonstrated in the context of two quite different client-server paradigms, one of which is consistent with the evolving JPIP (JPEG2000 Internet protocols) standard. Performance improvements as large as 8 dB are achieved with respect to a layer progressive sequencing strategy.

关键词： Rate-distortion Transform coding Image coding Discrete wavelet transforms Spatial resolution Scalability Image resolution Image quality Protocols computer graphics

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Rotational alignment of imu-camera systems with 1-point ransac 2nd

Rotational alignment of imu-camera systems with 1-point rans...

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2nd Chinese Conference on Pattern Recognition and computer Vision, PRCV 2019

作者： Guan, Banglei Su, Ang Li, Zhang Fraundorfer, Friedrich College of Aerospace Science and Engineering National University of Defense Technology Changsha China Hunan Provincial Key Laboratory of Image Measurement and Vision Navigation Changsha China Institute for Computer Graphics and Vision Graz University of Technology Graz Austria

ISBN: (纸本)9783030317256

In this paper we present a minimal solution for the rotational alignment of IMU-camera systems based on a homography formulation. The image correspondences between two views are related by homography when the motion of the camera can be effectively approximated as a pure rotation. By exploiting the rotational angles of the features obtained by e.g. the SIFT detector, we compute the rotational alignment of IMU-camera systems with only 1 feature correspondence. The novel minimal case solution allows us to cope with feature mismatches efficiently and robustly within a random sample consensus RANSAC scheme. Our method is evaluated on both synthetic and real scene data, demonstrating that our method is suited for the rotational alignment of IMU-camera systems. © Springer Nature Switzerland AG 2019.

关键词： Cameras

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A new approach for motion estimation and correction of thermographic images in brain surgery 16

A new approach for motion estimation and correction of therm...

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16th International Workshop on Cellular Nanoscale Networks and Their Applications, CNNA 2018

作者： Moshaei-Nezhad, Yahya Müller, Jens Tetzlaff, Ronald Hoffmann, Nico Institute of Circuits and Systems Faculty of Electronic and Computer Engineering Technische Universität Dresden Dresden01062 Germany Clinical Sensoring and Monitoring Anesthesiology and Intensive Care Medicine Faculty of Medicine Carl Gustav Carus Technische Universität Dresden Dresden01307 Germany Institute of Computer Graphics and Visualization Faculty of Computer Science Technische Universität Dresden Dresden01062 Germany

ISBN: (纸本)9783800747665

Motion estimation and correction implementations are important components of medical image analysis. We present a new approach for motion estimation and correction of thermographic images in brain surgery. In a pre-processing step, the Phase Correlation (PC) method is performed in order to detect large displacements of objects in two successive images. Additionally, due to noise in thermographic images, a Cellular Nonlinear Network (CNN) based image enhancement method is applied. Then, in the following processing step, the Optical Flow (OF) method is employed to compensate local motion artifacts. The proposed algorithm is evaluated during an offline analysis of the recorded dataset of brain surgeries and the performance evaluation between different algorithms is made based on the determination of the Normalized Cross-Correlation (NCC). The results clearly indicate that the proposed algorithm is able to reduce breathing motion artifacts effectively as well as the NCC evaluation show better results in comparison to other mentioned algorithms. © VDE VERLAG GMBH.

关键词： Surgery

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Real-time auralisation system for virtual microphone positioning

Real-time auralisation system for virtual microphone positio...

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15th International Conference on Digital Audio Effects, DAFx 2012

作者： Barker, Tom Campos, Guilherme Dias, Paulo Vieira, José Mendonça, Catarina Santos, Jorge DETI Department of Electronics Telecomunications and Informatics IEETA Institute of Electronics and Telematics Engineering of Aveiro Universidade de Aveiro Aveiro Portugal CCG Centre for Computer Graphics EPsi School of Psychology Universidade Do Minho Guimarães Portugal

A computer application was developed to simulate the process of microphone positioning in sound recording applications. A dense, regular grid of impulse responses pre-recorded on the region of the room under study allowed the sound captured by a virtual microphone to be auralised through real-time convolution with an anechoic stream representing the sound source. Convolution was performed using a block-based variation on the overlap-add method where the summation of many small sub-convolutions produced each block of output data samples. As the applied RIR filter varied on successive audio output blocks, a short cross fade was applied to avoid glitches in the audio. The maximum possible length of impulse response applied was governed by the size of audio processing block (hence latency) employed by the program. Larger blocks allowed a lower processing time per sample. At 23.2ms latency (1024 samples at 44.1kHz), it was possible to apply 9 second impulse responses on a standard laptop computer.

关键词： Impulse response

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