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Computational Visual Media 2019年第2期5卷 161-170页

作者： Martin Ritz Simon Breitfelder Pedro Santos Arjan Kuijper Dieter W. Fellner fraunhofer igd Darmstadt64283Germany TU Darmstadt Darmstadt64289Germany TU Graz Graz8010Austria

We show how to overcome the single weakness of an existing fully automatic system for acquisition of spatially varying optical material behavior of real object surfaces. While the expression of spatially varying material behavior with spherical dependence on incoming light as a 4D texture(an ABTF material model) allows flexible mapping onto arbitrary 3D geometry, with photo-realistic rendering and interaction in real time,this very method of texture-like representation exposes it to common problems of texturing, striking in two disadvantages. Firstly, non-seamless textures create visible artifacts at boundaries. Secondly, even a perfectly seamless texture causes repetition artifacts due to their organised placement in large numbers over a 3D surface. We have solved both problems through our novel texture synthesis method that generates a set of seamless texture variations randomly distributed over the surface at shading time. When compared to regular 2D textures, the inter-dimensional coherence of the 4D ABTF material model poses entirely new challenges to texture synthesis, which includes maintaining the consistency of material behavior throughout the 4D space spanned by the spatial image domain and the angular illumination hemisphere. In addition, we tackle the increased memory consumption caused by the numerous variations through a fitting scheme specifically designed to reconstruct the most prominent effects captured in the material model.

关键词： optical material behavior reflectance modeling 4D texture synthesis texturing

Perceptual hashing algorithms benchmark suite

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仪器仪表学报 2007年第4期28卷 603-608页

作者： Zhang Hui Schmucker Martin Niu Xiamu Harbin Institute of Technology Shenzhen Graduate School Room 304 Building No. 3 HIT Campus Shenzhen 518055 China fraunhofer igd Fraunhoferstr 5 Darmstadt 64283 Germany

Numerous perceptual hashing algorithms have been developed for identification and verification of multimedia objects in recent years. Many application schemes have been adopted for various commercial objects. Developers and users are looking for a benchmark tool to compare and evaluate their current algorithms or technologies. In this paper, a novel benchmark platform is presented. PHABS provides an open framework and lets its users define their own test strategy, perform tests, collect and analyze test data. With PHABS, various performance parameters of algorithms can be tested, and different algorithms or algorithms with different parameters can be evaluated and compared easily.

关键词：感觉散列算法 PHABS 基准点识别技术

CAD-VR geometry and meta data synchronization for design review applications

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第9期7卷 1482-1491页

作者： SCHILLING Arne KIM Seokryul WEISSMANN Daniel TANG Ziying CHOI Sangsu fraunhofer Institute for Computer Graphics （igd） Darmstadt 64283 Germany Institute for Graphic Interfaces （IGI） Seou1120-750 Korea Computer Graphics Center （ZGD V） Rostock 18059 Germany

In this paper we present the MEMPHIS middleware framework for the integration of CAD geometries and assemblies with derived Virtual Reality (VR) models and its specific meta data and attributes. The goal of this work is to connect real time VR applications, especially for the Design Review, with enterprise software storing and managing CAD models (Product Data Man- agement—PDM). The preparation of VR models requires expert knowledge, is time consuming, and includes selection of required CAD data, tessellation, healing of unwanted gaps, applying materials and textures, and special surface and light effects. During the Design Review process, decisions are made concerning the choice of materials and surface forms. While materials can be switched directly on the VR model, the modification of part geometries must be made on the CAD model. Our system synchronizes modi- fications of the original CAD geometries and of attributes that are relevant for the realistic rendering using the PLM Services standard. Thus, repeated work for the VR preparation can be avoided.

关键词： Virtual Reality (VR) CAD Product Data Management (PDM) Geometry conversion

3D face recognition algorithm based on detecting reliable components

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仪器仪表学报 2007年第5期28卷 769-773页

作者： Huang Wenjun Zhou Xuebing Niu Xiamu Harbin Institute of Technology Shenzhen Graduate School Room 304 Building No. 3 HIT Campus Shenzhen 518055 P. R. China fraunhofer igd Fraunhoferstr. 5 Darmstadt 64283 Germany

Fisherfaces algorithm is a popular method for face ***,there exist some unstable com- ponents that degrade recognition *** this paper,we propose a method based on detecting reliable com- ponents to overcome the problem and introduce it to 3D face *** reliable components are detected within the binary feature vector,which is generated from the Fisherfaces feature vector based on statistical properties,and is used for 3D face recognition as the final feature *** results show that the reliable components fea- ture vector is much more effective than the Fisherfaces feature vector for face recognition.

关键词： 3D人脸识别算法检测可靠度统计特性 Fisherfaces

3D Anisotropic Diffusion on GPUs by Closed-Form Local Tensor Computations

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Numerical Mathematics(Theory,Methods and Applications) 2013年第1期6卷 72-94页

作者： Arjan Kuijper Andreas Schwarzkopf Thomas Kalbe Chandrajit Bajaj Stefan Roth Michael Goesele fraunhofer igd 64283 DarmstadtGermany Department of Computer Science TU DarmstadtD-64289 DarmstadtGermany ICES-CVC University of Texas at AustinAustinTexas 78712USA.

We present an efficient implementation of volumetric anisotropic image diffusion filters on modern programmable graphics processing units(GPUs),where the mathematics behind volumetric diffusion is effectively reduced to the diffusion in 2D *** hereby avoid the computational bottleneck of a time consuming eigenvalue decomposition in ***,we use a projection of the Hessian matrix along the surface normal onto the tangent plane of the local isodensity surface and solve for the remaining two tangent space *** derive closed formulas to achieve this and prevent the GPU code from *** show that our most complex volumetric anisotropic diffusion filters gain a speed up of more than 600 compared to a CPU solution.

关键词： Image processing enhancement anisotropic diffusion tensors 3D filtering

A template consensus method for visual tracking

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Optoelectronics Letters 2019年第1期15卷 70-74页

作者： ZHOU Tong-xue ZENG Dong-dong ZHU Ming Arjan Kuijper hangchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China The University of the Chinese Academy of Sciences Beijing 100049China Department of Graphic Interactive System and Mathematical and Applied Visual Computing Fraunhofer Institute for Computer Graphics Research IGDDarmstadt 64283Germany

Visual tracking is a challenging problem in computer vision. Recently, correlation filter-based trackers have shown to provide excellent tracking performance. Inspired by a sample consensus approach proposed for foreground detection, which classifies a given pixel as foreground or background based on its similarity to recently observed samples, we present a template consensus tracker based on the kernelized correlation filter (KCF). Instead of keeping only one target appearance model in the KCF, we make a feature pool to keep several target appearance models in our method and predict the new target position by searching for the location of the maximal value of the response maps. Both quantitative and qualitative evaluations are performed on the CVPR2013 tracking benchmark dataset. The results show that our proposed method improves the original KCF tracker by 8.17% in the success plot and 8.11% in the precision plot.

关键词： method tracking challenging

Big Data Analytics for Earth Sciences:the EarthServer approach

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International Journal of Digital Earth 2016年第1期9卷 3-29页

作者： Peter Baumann Paolo Mazzetti Joachim Ungar Roberto Barbera Damiano Barboni Alan Beccati Lorenzo Bigagli Enrico Boldrini Riccardo Bruno Antonio Calanducci Piero Campalani Oliver Clements Alex Dumitrua,Mike Grant Pasquale Herzig George Kakaletris John Laxton Panagiota Koltsida Kinga Lipskoch Alireza Rezaei Mahdiraji Simone Mantovani Vlad Merticariu Antonio Messina Dimitar Misev Stefano Natali Stefano Nativi Jelmer Oosthoek Marco Pappalardo James Passmore Angelo Pio Rossi Francesco Rundo Marcus Sen Vittorio Sorbera Don Sullivan Mario Torrisi Leonardo Trovato Maria Grazia Veratelli Sebastian Wagner Large-Scale Scientific Information Systems Jacobs UniversityBremenGermany Rasdaman GmbH BremenGermany CNR-IIA National Research Council of ItalyInstitute of Atmospheric Pollution ResearchFlorenceItaly EOX IT Services GmbH ViennaAustria Consorzio COMETA CataniaItaly Division of Catania Italian National Institute for Nuclear PhysicsCataniaItaly Department of Physics and Astronomy University of CataniaCataniaItaly MEEO S.r.l. FerraraItaly Plymouth Marine Laboratory PlymouthUK fraunhofer igd DarmstadtGermany Athena Research and Innovation Center in Information Communication&Knowledge Technologies AthensGreece British Geological Survey EdinburghUK Software Engineering Italia S.r.l. CataniaItaly British Geological Survey KeyworthUK NASA Ames Research Center Moffett FieldCAUSA

Big Data Analytics is an emerging field since massive storage and computing capabilities have been made available by advanced *** and Environmental sciences are likely to benefit from Big Data Analytics techniques supporting the processing of the large number of Earth Observation datasets currently acquired and generated through observations and ***,Earth Science data and applications present specificities in terms of relevance of the geospatial information,wide heterogeneity of data models and formats,and complexity of ***,Big Earth Data Analytics requires specifically tailored techniques and *** EarthServer Big Earth Data Analytics engine offers a solution for coverage-type datasets,built around a high performance array database technology,and the adoption and enhancement of standards for service interaction(OGC WCS and WCPS).The EarthServer solution,led by the collection of requirements from scientific communities and international initiatives,provides a holistic approach that ranges from query languages and scalability up to mobile access and *** result is demonstrated and validated through the development of lighthouse applications in the Marine,Geology,Atmospheric,Planetary and Cryospheric science domains.

关键词： big data Big Data Analytics array databases Earth Sciences interoperability standards