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International Symposium on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks

作者： V. Singh R.J. La M.A. Shayman Computer Vision Laboratory IC Faculty École Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Institute for Computer Graphics and Vision Graz University of Technology Graz Austria

ISBN: (纸本)9781509013128

Multiple transmission point (TP) coordination is an effective tool for managing interference in heterogeneous networks. Using network-level MIMO coordination among TPs, multiple TPs can transmit independent data streams to a single user. We formulate our scheduling problem as a utility optimization problem over the set of user-TP pairs in each subframe, in which each user can be served by multiple TPs. We first prove that this optimization problem is NP-hard. Then, we propose a new scheme based on the difference-of-submodular-function optimization approach. We evaluate our scheme using detailed simulation and demonstrate that it performs on par with a more computationally demanding successive convex approximation optimization scheme. Moreover, the proposed scheme performs within a reasonable percentage of the optimal solution (Table IV). We also study its performance with varying network topology and parameters.

关键词： Coordinated Multipoint scheduling difference of submodular function (DSF) optimization successive convex approximation

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An interactive augmented reality coloring book

An interactive augmented reality coloring book

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International Symposium on Mixed and Augmented Reality (ISMAR)

作者： Adrian Clark Andreas Dünser Raphaël Grasset The HIT Laboratory NZ University of Canterbury Christchurch New Zealand Institute for Computer Graphics and Vision Graz University of Technology Austria

Creating entertaining and educational books not only requires providing visually stimulating content but also means for students to interact, create, and express themselves. In this paper we present a new type of mixed-reality book experience, which augments an educational coloring book with user-generated three dimensional content. We explore a “pop-up book” metaphor and describe a process by which children's drawing and coloring is used as input to generate and change the appearance of the book content. Our system is based on natural feature tracking and image processing techniques that can be easily exploited for other AR publishing applications.

关键词： Image color analysis Books Augmented reality Solid modeling Three dimensional displays Education Real time systems

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An Online Platform for Automatic Skull Defect Restoration and Cranial Implant Design

arXiv

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arXiv 2020年

作者： Li, Jianning Pepe, Antonio Gsaxner, Christina Egger, Jan Institute of Computer Graphics and Vision Graz University of Technology Computer Algorithms for Medicine Laboratory Graz Austria Department of Oral and Maxillofacial Surgery Medical University of Graz

We introduce a fully automatic system for cranial implant design, a common task in cranioplasty operations. The system is currently integrated in Studierfenster (http://***/), an online, cloud-based medical image processing platform for medical imaging applications. Enhanced by deep learning algorithms, the system automatically restores the missing part of a skull (i.e., skull shape completion) and generates the desired implant by subtracting the defective skull from the completed skull. The generated implant can be downloaded in the STereoLithography (.stl) format directly via the browser interface of the system. The implant model can then be sent to a 3D printer for in loco implant manufacturing. Furthermore, thanks to the standard format, the user can thereafter load the model into another application for post-processing whenever necessary. Such an automatic cranial implant design system can be integrated into the clinical practice to improve the current routine for surgeries related to skull defect repair (e.g., cranioplasty). Our system, although currently intended for educational and research use only, can be seen as an application of additive manufacturing for fast, patient-specific implant design. Copyright © 2020, The Authors. All rights reserved.

关键词： 3D printers

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Robust registration of virtual objects for industrial applications

Robust registration of virtual objects for industrial applic...

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IEEE International Conference on Industrial Technology (ICIT)

作者： B. Fergani M.C. Batouche B. Boufama Computer Science Department Faculty of Engineering LIRE laboratory Vision and Computer Graphics Group Mentouri University Constantine Algeria School of Computer Science University of Windsor Windsor Canada

vision-based registration techniques for augmented reality systems have been the subject of intensive research recently due to their potential to accurately align virtual objects with the real world. The registration process can be done in three steps: 1) Positioning: put the virtual object at a desired position. 2) Rendering: get the 2D image of the positioned 3D virtual object 3) The rendering of the virtual object will then be merged with the image of real environment to compose an augmented image. Rendering the virtual object is not trivial work, since it not only depends on its 3D location and orientation, but also depends on the camera's location and orientation. When the camera undergoes a transformation, the parameters for rendering will also be accordingly changed. Therefore, for a realtime augmented reality system, the camera pose must be dynamically tracked at frame rate. In order to simulate the real camera, we have to know its intrinsic and extrinsic parameters. The intrinsic parameters describe camera's optical, geometric and digital characteristics. The extrinsic parameters describe position and orientation of the camera. Both intrinsic and extrinsic parameters can be estimated through a camera calibration process (for example Zonglei and Boufama's method). However, calibrating the camera in real-time, for applications similar to industry, is not necessary (for example Kutulakos & vallino's method). In this paper we present our framework based on Zonglei & Boufama's approach and we describe Kutulakos & vallino's approach (we haven't yet results).

关键词： Robustness Augmented reality Rendering (computer graphics) computer science Virtual reality Laboratories computer graphics Digital cameras Geometrical optics Parameter estimation

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The Effect of a Temporary Bottleneck in Two-Lane of a Road on Traffic Flow Based on the Kerner-Klenov-Wolf Model

The Effect of a Temporary Bottleneck in Two-Lane of a Road o...

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2011 International Conference on Advanced Materials and computer Science(ICAMCS 2011)

作者： Liang Haijun Yang Hongyu Xiao Chao Sheng Peng Zhang Jianwei School of Computer Science Sichuan University Key Laboratory of Fundamental Synthetic Vision Graphics and Image Science for National Defense Sichuan University

Considering a temporary bottleneck made by special accidents,we proposed a new two-lane traffic model based on the KKW(Kerner-Klenov-Wolf) modelAccording to the difference of driver behavior and vehicle type,we present a new asymmetry lane-changing rules and the model of grabbing the entrance of a bottleneckIn our simulation,as demonstrated by various examples,the asymmetry lane-changing and the heterogeneous distribution of vehicles easily result in complex fluctuations of traffic flow and jam

关键词： asymmetry lane-changing rule KKW model and temporary bottleneck

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Rational discrete generalized cylinders and their application to shape recovery in medical images

Rational discrete generalized cylinders and their applicatio...

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Conference on computer vision and Pattern Recognition (CVPR)

作者： J.P. Williams J.K. Johnstone L.B. Wolff Computer Vision Laboratory Department of Computer Science Johns Hopkins University Baltimore MD USA Graphics and A.I. Laboratory Department of Computer and Information Sciences University of Alabama Birmingham Birmingham AL USA

Generalized cylinders (GCs) are a popular representational tool in computer vision. In medical imaging, the curved axis GC is particularly applicable to a number of elongated physical structures such as vasculature, bone and bronchi. In many of these instances, it is necessary to recover curved-axis GCs with arbitrary cross-sections. It is also vital that these structures, once recovered, can be analyzed and visualized with off-the-shelf algorithms and software packages. Such tools are usually designed to operate on the domain of polynomial or rational surfaces. Unfortunately most extant, suitably versatile GC representations do not admit rational parameterizations. We develop an entirely rational B-spline representation for generalized cylinders with curved axes and arbitrary cross-section functions. We demonstrate how our representation can be used as a deformable model by extracting a rational GC from pre-segmented spinal data using a discrete dynamic surface fit.

关键词： Application software computer vision Biomedical imaging Bones Respiratory system Algorithm design and analysis Visualization Software algorithms Software packages Polynomials

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Simulation of the handling of real objects with a complete control of rotation

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Information Technology Journal 2007年第5期6卷 672-680页

作者： Nini, Brahim Batouche, Mohamed Larbi Ben M'hidi University 04000 Oum El-bouaghi Algeria LIRE Laboratory Vision and Computer Graphics Group Mentouri University 25000 Constantine Algeria

This study describes a complete movie-based solution for simulating the manipulation of a real object in three rotational degrees of freedom. The solution uses a linear structure to store the frames corresponding to different viewing directions of the object. Simulating rotations is then equivalent to orbiting a virtual camera around the object and projecting what it is supposed to grab. The method links these rotations with those of the real camera while grabbing in order to extract the corresponding frames. This correspondence is geometry-based and expressed in an analytical way. The solution is entirely parameterised and independent of the number of taken images. Consequently, this study is an assessment of the mathematical background of an image-based manipulation using a specific organization both in the grab and storage of the images. In fact, the research provides a complement matter to some works which detail explicit mathematical concepts related to scene navigation but, in general, they do not emphasize the ones related to object manipulation. © 2007 Asian Network for Scientific Information.

关键词： Image analysis

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Using Image Morphing for Memory-Efficient Impostor Rendering on GPU

Using Image Morphing for Memory-Efficient Impostor Rendering...

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International Conference on Cyberworlds

作者： Kamer Ali Yuksel Aytul Ercil Alp Yucebilgin Selim Balcisoy Computer Vision and Pattern Analysis Laboratory Faculty of Engineering and Natural Sciences Sabanci University Istanbul Turkey Faculty of Engineering and Natural Sciences Computer Graphics Laboratory Sabanci University Istanbul Turkey

Real-time rendering of large animated crowds consisting thousands of virtual humans is important for several applications including simulations, games and interactive walkthroughs, but cannot be performed using complex polygonal models at interactive frame rates. For that reason, several methods using large numbers of pre-computed image-based representations, which are called as impostors, have been proposed. These methods take the advantage of existing programmable graphics hardware to compensate the computational expense while maintaining the visual fidelity. Making the number of different virtual humans, which can be rendered in real-time, not restricted anymore by the required computational power but by the texture memory consumed for the variety and discretization of their animations. In this work, we proposed an alternative method that reduces the memory consumption by generating compelling intermediate textures using image-morphing techniques. In order to demonstrate the preserved perceptual quality of animations, where half of the key-frames were rendered using the proposed methodology, we have implemented the system using the graphical processing unit and obtained promising results at interactive frame rates.

关键词： Rendering (computer graphics) Animation graphics processing unit Memory management Cameras Face Humans

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TAEC: Unsupervised Action Segmentation with Temporal-Aware Embedding and Clustering

arXiv

引用

arXiv 2023年

作者： Lin, Wei Kukleva, Anna Possegger, Horst Kuehne, Hilde Bischof, Horst Institute of Computer Graphics and Vision Graz University of Technology Austria Christian Doppler Laboratory for Semantic 3D Computer Vision Austria Max-Planck-Institute for Informatics Germany Goethe University Frankfurt Germany

Temporal action segmentation in untrimmed videos has gained increased attention recently. However, annotating action classes and frame-wise boundaries is extremely time consuming and cost intensive, especially on large-scale datasets. To address this issue, we propose an unsupervised approach for learning action classes from untrimmed video sequences. In particular, we propose a temporal embedding network that combines relative time prediction, feature reconstruction, and sequence-to-sequence learning, to preserve the spatial layout and sequential nature of the video features. A two-step clustering pipeline on these embedded feature representations then allows us to enforce temporal consistency within, as well as across videos. Based on the identified clusters, we decode the video into coherent temporal segments that correspond to semantically meaningful action classes. Our evaluation on three challenging datasets shows the impact of each component and, furthermore, demonstrates our state-of-the-art unsupervised action segmentation results. Copyright © 2023, The Authors. All rights reserved.

关键词： Large dataset

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Robustness of object detectors in degrading weather conditions

arXiv

引用

arXiv 2021年

作者： Mirza, Muhammad Jehanzeb Buerkle, Cornelius Jarquin, Julio Opitz, Michael Oboril, Fabian Scholl, Kay-Ulrich Bischof, Horst Christian Doppler Laboratory for Embedded Machine Learning Institute for Computer Graphics and Vision Graz University of Technology Austria Intel Labs Karlsruhe Germany

State-of-the-art object detection systems for autonomous driving achieve promising results in clear weather conditions. However, such autonomous safety critical systems also need to work in degrading weather conditions, such as rain, fog and snow. Unfortunately, most approaches evaluate only on the KITTI dataset, which consists only of clear weather scenes. In this paper we address this issue and perform one of the most detailed evaluation on single and dual modality architectures on data captured in real weather conditions. We analyse the performance degradation of these architectures in degrading weather conditions. We demonstrate that an object detection architecture performing good in clear weather might not be able to handle degrading weather conditions. We also perform ablation studies on the dual modality architectures and show their limitations. © 2021, CC BY.

关键词： Object detection

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