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共 492 条记录，以下是131-140 订阅

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A color morphology based on pareto-dominance relation and hypervolume measure

A color morphology based on pareto-dominance relation and hy...

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4th European conference on Colour in graphics, Imaging, and Vision and 10th International Symposium on Multispectral Colour Science, CGIV 2008/MCS'08

作者： Koppen, Mario Franke, Katrin Dept. of Artficial Intelligence Kyushu Institute of Technology Lizuka Fukuoka Japan Dept. of Computer Science and Media Technology Gjøvik University College Gjøvik Norway

ISBN: (纸本)9781605607023

Challenges in designing non-linear color and multi-spectral image filters can be addressed by known approaches from the field of multi-objective optimization. In particular Pareto-set theory is considered to be feasible. In this paper we explore the impact of so-called indicator functions, which are used to represent all points on a Pareto front. thereby, we focus on the most common indicator function that is the Hypervolume. It is used to derive an alternative approach to color morphology. We present the conceptional base for the morphological operators, a study of their properties and show their impact in real-world applications, i.e. secure document analysis. © 2008 Society for Imoging Science and Technology.

关键词： Set theory

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Real-time detection and recognition of machine-readable zones with mobile devices 10

Real-time detection and recognition of machine-readable zone...

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10th International conference on computer Vision theory and applications, VISAPP 2015

作者： Hartl, Andreas Arth, Clemens Schmalstieg, Dieter Institute for Computer Graphics and Vision Graz University of Technology Inffeldgasse 16 Graz8010 Austria

ISBN: (纸本)9789897580918

Many security documents contain machine readable zones (MRZ) for automatic inspection. An MRZ is intended to be read by dedicated machinery, which often requires a stationary setup. Although MRZ information can also be read using camera phones, current solutions require the user to align the document, which is rather tedious. We propose a real-time algorithm for MRZ detection and recognition on off-the-shelf mobile devices. In contrast to state-of-the-art solutions, we do not impose position restrictions on the document. Our system can instantly produce robust reading results from a large range of viewpoints, making it suitable for document verification or classification. We evaluate the proposed algorithm using a large synthetic database on a set of off-the-shelf smartphones. the obtained results prove that our solution is capable of achieving good reading accuracy despite using largely unconstrained viewpoints and mobile devices.

关键词： Machinery

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Geometry compression method for terrain rendering with GPU-based error metric

Geometry compression method for terrain rendering with GPU-b...

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10th International conference on Virtual Reality Continuum and Its applications in Industry, VRCAI'11

作者： Ge, Zihou Li, Wenhui College of Computer Science and Technology JiLin University Changchun Jilin China Aeronautical Engineering Department Aeronautical University of Air Force Changchun Jilin China

ISBN: (纸本)9781450310604

We present a geometry compression method for large-scale terrain rendering, which is based on restricted quadtree meshes. Terrain data of our method are organized by special structure, and then dynamically transmitted to graphic hardware and compute dynamic error metric by GPU, for the purpose of reducing bandwidth requirements and saving the running time of CPU. © 2011 ACM.

关键词： graphics processing unit

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Multi-metric and multi-entity characterization of applications for early system design exploration 05

Multi-metric and multi-entity characterization of applicatio...

引用

10th Asia and South pacific Design Automation conference

作者： Cai, Lukai Gerstlauer, Andreas Gajski, Daniel Univ Calif Irvine Ctr Embedded Comp Syst Irvine CA USA

ISBN: (纸本)0780387368

At system level, intensively analyzing the system application will produce a variety of useful characteristics and provide designers valuable exploration indications. In this paper, we present such an analysis approach based on the instrumentation-based profiling. the proposed approach analyzes complex system application and generates multi-metric and multi-entity characteristics. Experimental results show the applicability of the approach for efficient early design space exploration.

关键词： Space exploration Instruments Computational modeling Application software Character generation Embedded computing Analytical models System analysis and design computer architecture Memory architecture

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Point cloud structural parts extraction based on segmentation energy minimization 10

Point cloud structural parts extraction based on segmentatio...

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10th International conference on computer graphics theory and applications, GRAPP 2015

作者： Cafaro, Bruno Azimi, Iman Ntouskos, Valsamis Pirri, Fiora Ruiz, Manuel Department of Computer Science Sapienza University of Rome Via L. Ariosto 25 Rome Italy

ISBN: (纸本)9789897580871

In this work we consider 3D point sets, which in a typical setting represent unorganized point clouds. Segmentation of these point sets requires first to single out structural components of the unknown surface discretely approximated by the point cloud. Structural components, in turn, are surface patches approximating unknown parts of elementary geometric structures, such as planes, ellipsoids, spheres and so on. the approach used is based on level set methods computing the moving front of the surface and tracing the interfaces between different parts of it. Level set methods are widely recognized to be one of the most efficient methods to segment both 2D images and 3D medical images. Level set methods for 3D segmentation have recently received an increasing interest. We contribute by proposing a novel approach for raw point sets. Based on the motion and distance functions of the level set we introduce four energy minimization models, which are used for segmentation, by considering an equal number of distance functions specified by geometric features. Finally we evaluate the proposed algorithm on point sets simulating unorganized point clouds. Copyright © 2015 SCITEPRESS - Science and Technology Publications. All rights reserved.

关键词： Numerical methods

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Reconstruction of relatively straight medium to long hair models using kinect sensors 10

Reconstruction of relatively straight medium to long hair mo...

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10th International conference on computer graphics theory and applications, GRAPP 2015

作者： Sun, Chao Li, Zhongrui Lee, Won-Sook School of Electrial Engineering and Computer Science University of Ottawa OttawaON Canada

ISBN: (纸本)9789897580871

Most existing hair capturing methods reconstruct 3D hair models from multi-view stereo based on complex capturing systems composed of many digital cameras and light sources. In this paper, we introduce a novel hair capturing system using consumer RGB-D (Kinect sensors). Our capture system, consisting of three Kinect v2 sensors, is much simpler than previous hair capturing systems. We directly use the 3D point clouds captured by Kinect v2 sensors as the hair volume. then we adopt a fast and robust image enhancement algorithm to adaptively improve the clarity of the hair strands geometry based on the estimated local strands orientation and frequency from the hair images captured by the Kinect colour sensors. In addition, we introduced a hair strand grow-and-connect algorithm to generate relatively complete hair strands. Furthermore, by projecting the 2D hair strands onto the 3D point clouds, we can obtain the corresponding 3D hair strands. the experimental results indicate that our method can generate plausible 3D models for long, relatively straight hair. Copyright © 2015 SCITEPRESS - Science and Technology Publications. All rights reserved.

关键词： Light sources

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the influence of gravity-adapted target resizing on direct augmented reality pointing under simulated hypergravity 10

The influence of gravity-adapted target resizing on direct a...

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10th International conference on computer graphics theory and applications, GRAPP 2015

作者： Markov-Vetter, Daniela Zander, Vanja Latsch, Joachim Staadt, Oliver Institute Aerospace Medicine German Aersospace Center Cologne Germany Institute of Cardiology and Sports Medicine German Sport University Cologne Cologne Germany Institute of Computer Science University of Rostock Rostock Germany

ISBN: (纸本)9789897580871

the performance of Augmented Reality direct object selection coded outside of the human egocentric body frame of reference decreases under short-term altered gravity. therefore adequate countermeasures are required. this paper presents the results of a proof-of-concept (POC) study to investigate the impact of simulated hypergravity on the size and distance of a given target. the POC study is divided in a case study and a user study, whereby hypergravity was induced by a long-arm human centrifuge and additional arm weighting. For gravity-dependent resizing and -positioning we used the Hooke's law that resulted in two techniques of target deformation (compression, elongation) and compared both methods with normal sized targets. Besides common metrics to measure the performance, we additionally evaluated the physiological strain by the heart rate variability and the speed-accuracy tradeoff of the resizing techniques according to Fitts' law. the study showed that the online adaption of the present gravity load to targets' size and distance influences the performance of direct AR direct pointing. the results revealed that the pointing performance benefits from elongation target deformation by increased target sizes and distances. Copyright © 2015 SCITEPRESS - Science and Technology Publications. All rights reserved.

关键词： Augmented reality

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Solid geometric object reconstruction from single line drawing image 10

Solid geometric object reconstruction from single line drawi...

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10th International conference on computer graphics theory and applications, GRAPP 2015

作者： Zheng, Jinxin Wang, Yongtao Tang, Zhi Institute of Computer Science and Technology Peking University No.5 Yiheyuan Road Haidian District Beijing100871 China

ISBN: (纸本)9789897580871

We present a robust method to reconstruct solid geometric object from single line drawing image taken from the geometric books. Unlike most of the existing methods which require perfect and complete sketches of the line drawings as the inputs, our method directly takes the line drawing images as the inputs and can well handle the incomplete sketches that are automatically produced by our sketch extraction algorithm. the proposed method consists of three major steps as follows: First, the sketch of the input line drawing (i.e., line segments and their intersections) is automatically extracted and further represented as an undirected graph. Second, candidate 3D models from the pre-built 3D model database are found by graph matching. third, for each candidate 3D model, the model parameters, the rotation and the translation aligning the model with the sketch, are found by optimizing an objective function which is composed of the residuals between the vertices of the sketch and the 2D projections of the candidate model's vertices, and an optimal reconstruction solution is further selected as the final result. Experimental results show that our method can effectively reconstruct the solid geometric object from single line drawing image. Copyright © 2015 SCITEPRESS - Science and Technology Publications. All rights reserved.

关键词： Extraction

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Subdivision surface simplification

Subdivision surface simplification

引用

pacific conference on computer graphics and applications

作者： Won-Ki Jeong K. Kahler H.-P. Seidel Max Planck Institut für Informatik Saarbruecken Germany

A modified quadric error metric (QEM) for simplification of Loop subdivision surfaces is presented the suggested error metric not only measures the geometric difference but also controls the smoothness and well-shapedness of the triangles that result from the decimation process. Minimizing the error with respect to the original limit surface, our method allows for drastic simplification of Loop control meshes with convenient control over the reproduction of sharp features.

关键词： Surface fitting Error correction Surface reconstruction Tensile stress Bridges Control systems Displays Mesh generation computer graphics Application software

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Texture mapping with a Jacobian-based spatially-variant filter

Texture mapping with a Jacobian-based spatially-variant filt...

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pacific conference on computer graphics and applications

作者： Ke Deng Jingdan Zhang Lifeng Wang Baining Guo Microsoft Research Asia Beijing China Tsinghua University Beijing China

ISBN: (纸本)0769517846

In this paper we describe a new method to map a texture on a surface with a spatially-variant filter. Our filter takes into consideration the effects of anisotropy using a Jacobian approximation while computing the sampling rate, and the interpolation weights are computed with a sinc function. We also discuss how to do forward and backward mapping with the filter and extend our algorithms to 3D meshes. Our experimental results verify our analysis.

关键词： Jacobian matrices Kernel Filters Sampling methods Frequency Image sampling Asia Surface texture Filtering computer graphics

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