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A robust image copy detection method based on feature extraction algorithm

Journal of Information Hiding and Multimedia Signal Processing 2016年第5期7卷 1136-1146页

作者： Lu, Jian Feng Xu, Xiao Yan Li, Li Chang, Chin-Chen Wang, Qiang Institute of Graphics and Image Hangzhou Dianzi University HangzhouZhejiang China Institute of Digital Media Hangzhou Dianzi University HangzhouZhejiang China Department of Information Engineering and Computer Science Feng Chia University Taichung Taiwan

Detecting copied versions of a query image is very important for copyright protection. This paper presents a robust copy detection method for images. The main contribution of our algorithm is to combine the image feature extraction and the saliency image segmentation methods, and a novel two steps approach is proposed for the image copy detection. Firstly, several salient regions in a query image are extracted based on salient region detection method and segmented into a series of partial images, with introduction of illumination variation to obtain a better saliency image. Secondly, surf key points in both partial images and images in database are extracted and the number of correctly matched key points is computed. Similarity value is computed to judge if two key points are correctly matched. Finally, if the number of correctly-matched key points is greater than the threshold value, the image from database is judged as a copy of the query image. The experimental results show that the proposed method can detect copyright information of query image even when the image is cropped, rotated, put in picture, water-colored, changed in contrast, blurred or inserted with words. © 2016, Ubiquitous International. All Rights Reserved.

关键词： Image segmentation

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Procedural Modeling of Round Building Geometry

Procedural Modeling of Round Building Geometry

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International Conference on Cyberworlds

作者： Johannes Edelsbrunner Sven Havemann Alexei Sourin Dieter W. Fellner Institute for Computer Graphics and Knowledge Visualization (CGV) Graz University of Technology Graz Austria School of Computer Science and Engineering Nanyang Technological University Singapore Fraunhofer IGD TU Darmstadt Darmstadt Germany

Creation of procedural 3D building models can significantly lessen the costs of modeling, since it allows generating a variety of similar shapes from one procedural description. The common field of application for procedural modeling is modeling of straight building facades, which are very well suited for shape grammars – a special kind of procedural modeling system. In order to generate round building geometry, we present a way to setup different coordinate systems in shape grammars. Besides Cartesian, these are primarily cylindrical and spherical coordinate systems for generation of structures like towers or domes, that can procedurally adapt to different dimensions and parameters. The users can apply common splitting idioms from shape grammars in their familiar way, for creating round instead of straight geometry.

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Vision-based Unmanned Aerial Vehicle detection and tracking for sense and avoid systems

Vision-based Unmanned Aerial Vehicle detection and tracking ...

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IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Krishna Raj Sapkota Steven Roelofsen Artem Rozantsev Vincent Lepetit Denis Gillet Pascal Fua Alcherio Martinoli Computer Vision Laboratory School of Communication and Computer Sciences école Polytechnique Fédérale de Lausanne (EPFL) Switzerland Distributed Intelligent Systems and Algorithms Laboratory School of Architecture Civil and Environmental Engineering EPFL Switzerland Institute for Computer Graphics and Vision TU Graz Austria Coordination and Interaction System Group School of Engineering EPFL Switzerland

ISBN: (纸本)9781509037636

We propose an approach for on-line detection of small Unmanned Aerial Vehicles (UAVs) and estimation of their relative positions and velocities in the 3D environment from a single moving camera in the context of sense and avoid systems. This problem is challenging both from a detection point of view, as there are no markers on the targets available, and from a tracking perspective, due to misdetection and false positives. Furthermore, the methods need to be computationally light, despite the complexity of computer vision algorithms, to be used on UAVs with limited payload. To address these issues we propose a multi-staged framework that incorporates fast object detection using an AdaBoost-based approach, coupled with an on-line visual-based tracking algorithm and a recent sensor fusion and state estimation method. Our framework allows for achieving real-time performance with accurate object detection and tracking without any need of markers and customized, high-performing hardware resources.

关键词： Target tracking Object detection Collision avoidance Cameras Visualization Detectors

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Variable neighborhood search for integrated timetable based design of railway infrastructure

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Electronic Notes in Discrete Mathematics 2015年 47卷 141-148页

作者： Grujičić, Igor Raidl, Günther Schöbel, Andreas Institute of Computer Graphics and Algorithms Vienna University of Technology Vienna Austria Institute of Transportation Research Centre for Railway Engineering Vienna University of Technology Vienna Austria

In this paper we deal with the problem of building new or extending an existing railway infrastructure. The goal is to determine a minimum cost infrastructure fulfilling the requirements defined by an integrated timetable and the operation of the railway system. We first model this planning task as a combinatorial network optimization problem, capturing the essential aspects. We then present a metaheuristic solution method based on general variable neighborhood search that makes use of a dynamic programming procedure for realizing individual connections. Computational experiments indicate that the suggested approach is promising and the analysis of obtained results gives useful hints for future work in this area. © 2014 Elsevier B.V.

关键词： Dynamic programming Integrated timetables Railway infrastructure design Variable neighborhood search

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Obstacle detection and avoidance module for the blind

Obstacle detection and avoidance module for the blind

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Proceedings of the Biannual World Automation Congress

作者： Paulo Costa Hugo Fernandes João Barroso Hugo Paredes Leontios J. Hadjileontiadis Computer Graphics and Sound Research/CCIC Polytechnic Institute of Leiria Leiria Portugal INESC TEC (formerly INESC Porto) University of Trás-os-Montes e Alto Douro Vila Real Portugal Department of Electrical and Computer Engineering Aristotle University of Thessaloniki Thessaloniki Greece

Assistive technology enables people to achieve independence when performing daily tasks and it enhances their overall quality of life. Visual information is the basis for most navigational tasks, so visually impaired individuals are at disadvantage due to the lack of sufficient information about their surrounding environment. With recent advances in inclusive technology it is possible to extend the support given to people with visual disabilities in terms of their mobility. In this context we present and describe a wearable system (Blavigator project), whose global objective is to assist visually impaired people in their navigation on indoor and outdoor environments. This paper is focused mainly on the computer Vision module of the Blavigator prototype. We propose an object collision detection algorithm based on stereo vision. The proposed algorithm uses Peano-Hilbert Ensemble Empirical Mode Decomposition (PH-EEMD) for disparity image processing and a two layer disparity image segmentation to detect nearby objects. Using the adaptive ensemble empirical mode decomposition (EEMD) image analysis real time is not achieved, with PH-EEMD results on a fast implementation suitable for real time applications.

关键词： computer vision Empirical mode decomposition Two dimensional displays Global Positioning System Interpolation Visualization

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Functional modelling and simulation of overall system ship-virtual methods for engineering and commissioning in shipbuilding 29

Functional modelling and simulation of overall system ship-v...

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29th European Conference on Modelling and Simulation, ECMS 2015

作者： Berndt, Olaf Von Lukas, Uwe Freiherr Kuijper, Arjan Fraunhofer Institute for Computer Graphics Research IGD Joachim-Jungius-Straße 11 Rostock18059 Germany University of Rostock Faculty of Computer Science and Electrical Engineering Albert-Einstein-Str. 22 Rostock18059 Germany Fraunhofer Institute for Computer Graphics Research IGD Fraunhoferstr. 5 Darmstadt64283 Germany

ISBN: (纸本)9780993244001

Shipbuilding industry is undergoing a change, in which many European shipyards focus on special purpose vessels. This field of shipbuilding places very high demands on engineering, commissioning and operation of the vessels. To support these fields of activity with virtual methods an innovative approach is introduced which strengthens the shipbuilding process by using a uniform common model of the overall system ship. The model is steadily increasing and gets more detailed through the phases of the shipbuilding. The presented approach fills the gap in the virtual support of the complete shipbuilding process, taking into account the specific structural needs-short time, high cost pressure and high quality demands. © ECMS Valeri M. Mladenov, Petia Georgieva, Grisha Spasov, Galidiya Petrova (Editors).

关键词： Shipbuilding

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Visualisation of physical simulation using JavaScript physics engine with X3DOM 29

Visualisation of physical simulation using JavaScript physic...

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29th Annual European Simulation and Modelling Conference 2015, ESM 2015

作者： Berndt, Olaf Huber, Linda Fraunhofer Institute for Computer Graphics Research IGD Joachim-Jungius-Straße 11 Rostock18059 Germany University of Rostock Faculty of Computer Science and Electrical Engineering Albert-Einstein-Str. 22 Rostock18059 Germany

ISBN: (纸本)9789077381908

In order to visualise the results of a physical simulation and the effect on the related 3D geometry so far only the simulation tools themselves could be applied. A web-based application, though, could provide a powerful alternative for an efficient and realistic visualisation of data enabling users to edit the data and to share their results with customers. In the course of the project physical modelling and simulation with OpenModelica was coupled with a rigid body simulation via the JavaScript physics engine Ammo.j s and an X3DOM-based 3D graphical modelling and visualisation. Now it is possible to start and edit physical simulations as well as to view the effect of changes on the behaviour of the system in the web-based 3D model.

关键词： Visualization

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PictureSensation - a mobile application to help the blind explore the visual world through touch and sound

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Journal of rehabilitation and assistive technologies engineering 2016年 3卷 2055668316674582-2055668316674582页

作者： Michael Banf Ruben Mikalay Baris Watzke Volker Blanz Media Systems Group Institute for Vision and Graphics Department of Computer Science and Electrical Engineering University of Siegen Germany.

We present PictureSensation, a mobile application for the hapto-acoustic exploration of images. It is designed to allow for the visually impaired to gain direct perceptual access to images via an acoustic signal. PictureSensation introduces a swipe-gesture based, speech-guided, barrier free user interface to guarantee autonomous usage by a blind user. It implements a recently proposed exploration and audification principle, which harnesses exploration methods that the visually impaired are used to from everyday life. In brief, a user explores an image actively on a touch screen and receives auditory feedback about its content at his current finger position. PictureSensation provides an extensive tutorial and training mode, to allow for a blind user to become familiar with the use of the application itself as well as the principles of image content to sound transformations, without any assistance from a normal-sighted person. We show our application's potential to help visually impaired individuals explore, interpret and understand entire scenes, even on small smartphone screens. Providing more than just verbal scene descriptions, PictureSensation presents a valuable mobile tool to grant the blind access to the visual world through exploration, anywhere.

关键词： Visually impaired accessibility computer vision human computer interaction mobile computing

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Thermal simulation of heterogeneous GaN/ InP/silicon 3DIC stacks

Thermal simulation of heterogeneous GaN/ InP/silicon 3DIC st...

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International 3D Systems Integration Conference, 3DIC 2015

作者： Harris, T. Robert Wyers, Eric J. Lee, Wang Graham, Samuel Pavlidis, Georges Franzon, Paul D. Davis, W. Rhett Department of Electrical and Computer Engineering North Carolina State University RaleighNC United States Department of Engineering and Computer Science Tarleton State University StephenvilleTX United States Calibre Design Solutions Mentor Graphics Corporation FremontCA United States Department of Mechanical Engineering Georgia Institute of Technology AtlantaGA United States

ISBN: (纸本)9781467393850

Integration of materials such as GaN, InP, SiGe, and Si is a natural extension of the 3D-IC perspective and provides a unique solution for high performance circuits. In this approach, application of a component is no longer dependent on semiconductor material selection. In this paper, preliminary results are presented which examine the thermal performance of the technology. A thermal analysis prototype solution in Mentor graphics™ Calibre® provides surface heat maps based on IC layout, material property, and geometric configuration files. Chiplets are connected by heterogeneous interconnect (HIC). Differences in thermal performance of GaN and InP chiplets are explored by varying the number of HICs. Two methods for building up the model of a test chip are compared. One method uses custom scripts to place discrete blocks in the model to represent HICs, while the other uses thermal material properties extracted from the layout. Measurements presented confirm simulated results. © 2015 IEEE.

关键词： Gallium nitride

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Implementation of real-time duplex synthetic aperture ultrasonography

Implementation of real-time duplex synthetic aperture ultras...

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IEEE Symposium (IUS) Ultrasonics

作者： Martin Christian Hemmsen Lee Lassen Thomas Kjeldsen Jesper Mosegaard Jørgen Arendt Jensen Department of Electrical Engineering Technical University of Denmark Lyngby Denmark Computer Graphics Lab Alexandra Institute Denmark

ISBN: (纸本)9781479981830

This paper presents a real-time duplex synthetic aperture imaging system, implemented on a commercially available tablet. This includes real-time wireless reception of ultrasound signals and GPU processing for B-mode and Color Flow Imaging (CFM). The objective of the work is to investigate the implementation complexity and processing demands. The image processing is performed using the principle of Synthetic Aperture Sequential Beamforming (SASB) and the flow estimator is implemented using the cross-correlation estimator. Results are evaluated using a HTC Nexus 9 tablet and a BK Medical BK3000 ultrasound scanner emulating a wireless probe. The duplex imaging setup consists of interleaved B-mode and CFM frames. The required data throughput for real-time imaging is 36.1 MB/s. The measured data throughput peaked at 39.562 MB/s, covering the requirement for real-time data transfer and overhead in the TCP/IP protocol. Benchmarking of real-time imaging showed a total processing time of 25.7 ms (39 frames/s) which is less than the acquisition time (29.4 ms). In conclusion, the proposed implementation demonstrates that both B-mode and CFM can be executed in-time for real-time ultrasound imaging and that the required bandwidth between the probe and processing unit is within the current Wi-Fi standards.

关键词： Imaging graphics processing units Real-time systems Apertures Wireless communication Ultrasonic imaging Throughput

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