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Low-cost automatic inpainting for artifact suppression in facial images

Low-cost automatic inpainting for artifact suppression in fa...

引用

8th International Conference on computer Vision Theory and Applications, VISAPP 2013

作者： Sobiecki, André Telea, Alexandru Giraldi, Gilson Neves, Luiz Antonio Pereira Thomaz, Carlos Eduardo Scientific Visualization and Computer Graphics University of Groningen Nijenborgh 9 Groningen Netherlands Department of Computing National Laboratory of Scientific Computation Petŕopolis Brazil Department of Computing Parańa Federal University Curitiba Brazil Department of Artificial Intelligence Applied on Automation University Center of FEI Sao Bernardo do Campo Brazil

ISBN: (纸本)9789898565471

Facial images are often used in applications that need to recognize or identify persons. Many existing facial recognition tools have limitations with respect to facial image quality attributes such as resolution, face position, and artifacts present in the image. In this paper we describe a new low-cost framework for preprocessing low-quality facial images in order to render them suitable for automatic recognition. For this, we first detect artifacts based on the statistical difference between the target image and a set of pre-processed images in the database. Next, we eliminate artifacts by an inpainting method which combines information from the target image and similar images in our database. Our method has low computational cost and is simple to implement, which makes it attractive for usage in low-budget environments. We illustrate our method on several images taken from public surveillance databases, and compare our results with existing inpainting techniques.

关键词： Database systems

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Anisotropic range image integration

Anisotropic range image integration

引用

Joint 34th Symposium of the German Association for Pattern Recognition, DAGM 2012 and 36th Symposium of the Austrian Association for Pattern Recognition, OAGM 2012

作者： Schroers, Christopher Zimmer, Henning Valgaerts, Levi Bruhn, Andrés Demetz, Oliver Weickert, Joachim Mathematical Image Analysis Group Faculty of Mathematics and Computer Science Saarland University Saarbrücken 66041 Germany Computer Graphics Laboratory Department of Computer Science ETH Zurich Zurich 8092 Switzerland Max-Planck-Institut für Informatik Campus E1.4 Saarbrücken 66123 Germany Institute for Visualization and Interactive Systems University of Stuttgart Universitätsstraße 38 70569 Stuttgart Germany

ISBN: (纸本)9783642327162

Obtaining high-quality 3D models of real world objects is an important task in computer vision. A very promising approach to achieve this is given by variational range image integration methods: They are able to deal with a substantial amount of noise and outliers, while regularising and thus creating smooth surfaces at the same time. Our paper extends the state-of-the-art approach of Zach et al.(2007) in several ways: (i) We replace the isotropic space-variant smoothing behaviour by an anisotropic (direction-dependent) one. Due to the directional adaptation, a better control of the smoothing with respect to the local structure of the signed distance field can be achieved. (ii) In order to keep data and smoothness term in balance, a normalisation factor is introduced. As a result, oversmoothing of locations that are seen seldom is prevented. This allows high quality reconstructions in uncontrolled capture setups, where the camera positions are unevenly distributed around an object. (iii) Finally, we use the more accurate closest signed distances instead of directional signed distances when converting range images into 3D signed distance fields. Experiments demonstrate that each of our three contributions leads to clearly visible improvements in the reconstruction quality. © 2012 Springer-Verlag.

关键词： computer vision

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Automated 3D heart segmentation by search rays for building individual conductor models

Automated 3D heart segmentation by search rays for building ...

引用

Medical Imaging 2009: visualization, Image-Guided Procedures, and Modeling

作者： Kim, Jaeil Kim, Seokyeol Kim, Kiwoong Park, Jinah Computer Graphics and Visualization Laboratory Information and Communications University 119 Munji-ro Yusung-gu Daejeon Korea Republic of Center for Brain and Cognitive Science Research Korea Research Institute of Standards and Science 209 Gajung-ro Yusung-gu Daejeon Korea Republic of

ISBN: (纸本)9780819475121

Magnetocardiograph (MCG) is one of the most useful diagnosing tools for myocardial ischemic diseases and the conduction abnormality, since the technique directly measures magnetic fields generated by myocardial currents without distortion in a non-invasive way. To localize the current source accurately, building a patient-specific conductor model is indispensable. In this paper, we present the method to automatically construct a patient-specific three-dimensional (3D) mesh model of a human thorax and a heart consisting of pericardium and four chambers. We represent the standard thorax model by simplex meshes, and deform them to fit into the individual CT data to reconstruct accurate surface representations for the MCG conductor model. The deformable simplex mesh model deforms based on the external forces exerted by the edge and gradient components of the source volume data while its internal force acts to maintain the integrity of the shape. However, image driven deformation is often very sensitive to its initial position. Therefore, we suggest our solution to automatic region-of-interest (ROI) detection using search rays, which are casted to 3D volume images to identify the region of a heart based on both the radiodensity values and their continuity along the path of the rays. Upon automatic ROI detection with search rays, the initial position and orientation of the standard mesh model is determined, and each vertex of the model is respectively moved by the weighted sum of the internal and eternal forces to conform to the each patient's own thorax and heart shape while minimizing the user's input. © 2009 SPIE.

关键词： Heart

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Delocalized unsteady vortex region detectors

Delocalized unsteady vortex region detectors

引用

13th International Fall Workshop Vision, Modeling, and visualization 2008, VMV 2008

作者： Fuchs, Raphael Peikert, Ronald Sadlo, Filip Alsallakh, Bilal Gröller, Meister Eduard Institute of Computer Graphics and Algorithms TU Vienna Austria VRVis Research Center for Virtual Reality and Visualization Vienna Austria Computer Graphics Laboratory ETH Zurich Switzerland

ISBN: (纸本)9781586039219

In this paper we discuss generalizations of instantaneous, local vortex criteria. We incorporate information on spatial context and temporal development into the detection process. The presented method is generic in so far that it can extend any given Eulerian criterion to take the Lagrangian approach into account. Furthermore, we present a visual aid to understand and steer the feature extraction process. We show that the delocalized detectors are able to distinguish between connected vortices and help understanding regions of multiple interacting vortex structures. The delocalized detectors extract smoother structures and reduce noise in the vortex detection result.

关键词： Vortex flow

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Spherical layout – Layout for 3d tree visualization

Spherical layout – Layout for 3d tree visualization

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2007 IADIS International Conference on Interfaces and Human computer Interaction, IHCI 2007, part of the 1st IADIS Multi Conference on computer Science and Information Systems, MCCSIS 2007

作者： Larrea, Martín L. Martig, Sergio R. Castro, Silvia M. Visualization and Computer Graphics Research and Development Laboratory Departamento de Ciencias e Ingenería de la Computación Universidad Nacional del Sur Avenida Alem 1253 Argentina

ISBN: (纸本)9789728924393

The 3D tree visualization faces multiples challenges: the election of an appropriate layout, the use of the interactions that make it easier the data exploration and a metaphor that helps the information understanding. A good combination of these three elements (layout, interactions and metaphor) will result in a visualization that effectively convey the key features of a complex structure or system to a wide range of users and permits the analytical reasoning process. The goal of this work was centered in the 3D tree visualization. In spite of their apparent simplicity, the displaying of a tree in 3D can also introduce new problems that can be overcome with the appropriate interactions. So, we have developed a new visualization technique for 3D tree visualization;this includes the design of a new tree layout that we called Spherical layout and the set of interactions that can be applied on this representation. This technique allows representing hierarchical structures to different levels of detail and also can be used as a visualization technique that allows a tree with attribute to be visualized. The Spherical layout has shown good result for large trees without compromising the performance;this is a key issue in tree visualization. © 2007 IADIS

关键词： visualization

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1 Course description

1 Course description

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ACM SIGGRAPH 2007 - International Conference on computer graphics and Interactive Techniques

作者： Kasik, Dave Gobbetti, Enrico Marton, Fabio Manocha, Dinesh Yoon, Sung-Eui Correa, Wagner Bruderlin, Beat Stephens, Abe Slusallek, Philipp Dietrich, Andreas Quilez, Iñigo Boeing Enterprise Visualization China Italy Department of Computer Science University of North Carolina Chapel Hill United States Lawrence Livermore National Laboratory United States Visualization Systems Group United States United States Department of Computer Science Technical University of Ilmenau Germany University of Utah's SCI Institute United States Department of Computer Graphics and Digital Media Saarland University Germany Computer Graphics Group Saarland University Germany

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A Hybrid Approach for a Real-time Haptic and Graphic Simulator in Virtual Environment

A Hybrid Approach for a Real-time Haptic and Graphic Simulat...

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IEEE International Workshop on Robot and Human Communication (ROMAN)

作者： Sang-Youn Kim Segil Park Dong-Soo Kwon Jinah Park Interactive Virtual Reality Laboratory Korea University of Technology and Education Cheonan South Korea School of Engineering ICU Computer Graphics and Visualization Laboratory Daejeon South Korea Department of Mechanical Engineering Telerobotics & Control Laboratory KAIST Daejeon South Korea

In interacting with a soft object, both visual and haptic senses play major role in providing the characteristics of the object. While visual feedback comes from the appearance of the overall shape, haptic feedback comes largely from the localized internal composition. However, it has been a common practice to represent the object with one model for both processing shape de formation and computing the feedback force, making it much challenging work to achieve real-time simulation of a soft and especially non-homogeneous object. In this paper, we claim that it may be sufficient to represent the graphical visual model as a surface model whereas it is necessary to represent the haptic model as a volumetric model. We propose, therefore, a hybrid model where volumetric haptic model and surface graphical model coexist. For constructing hybrid model, we employ S-chain model to compute the haptic behavior and mass-spring model to calculate graphic behavior. We conduct experiments with volumetric human liver model at a haptic update rate of 1000 Hz and graphic update rate of 30 Hz. The experimental results show that our proposed model satisfies the real-time performance and provides the realistic sense to be useful for a virtual reality application.

关键词： Haptic interfaces graphics Virtual environment Shape Force feedback Computational modeling Graphical models Humans Liver Virtual reality

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Development and implementation of rear projection algorithm based on high-end graphics accelerator

Development and implementation of rear projection algorithm ...

引用

16th International Conference on computer graphics and Vision, GraphiCon 2006

作者： Kovalkov, Max Rukhlinsky, Alexey V. Tarancev, Igor G. Department of Physics Novosibirsk State University Russia Laboratory of Synthesizing Visualization Systems IAE Russia Laboratory Computer Graphics IAE Russia

The algorithm of rear projection of noisy image is considered. Different types of filtration for suppression of noise are observed. Quantitative assessment of speed of the software implementation of the proposed algor... 详细信息

关键词： Image filtration Rear projection

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Noise cancellation frontends for automatic meeting transcription

Noise cancellation frontends for automatic meeting transcrip...

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6th European Conference on Noise Control: Advanced Solutions for Noise Control, EURONOISE 2006

作者： Képesi, Marián Van Pham, Tuan Kubin, Gernot Weruaga, Luis Juffinger, Andreas Grabner, Michael Signal Processing and Speech Communication Laboratory Graz University of Technology Inffeldgasse 8010 Graz Austria Commission for Scientific Visualization Austrian Academy of Sciences Donau-City Strasse 1 Vienna Austria Institute for Theoretical Computer Science Graz University of Technology Inffeldgasse 8010 Graz Austria Institute for Computer Graphics Graz University of Technology Inffeldgasse 8010 Graz Austria

One research direction to make computers become more active machines is to use audio input with far-field omni-directional microphones, these being required to face the acoustics problem of the meeting scenario. This topic is not only interesting from an artificial listener point-of-view, but also as one of the hottest topics in searchable media. In this paper two noise suppression methods for real meeting audio are evaluated. Because of the usage of hands-free microphones in a meeting environment, the reverberation of meeting rooms and background noise sources such as projector, computer fan have huge impact on speech quality. Two denoising methods, based on statistical Wavelet filtration and short-time Fourier transform are discussed and evaluated. Whilst the quantile technique is suitable for estimating stationary noise (beamer, computer fan), non-stationary sources (closing door, chair movement) can be handled by recursive structure and adaptive temporal gain of the statistical filtration method. Besides, frequency non-linear gain can remove colored noise effectively. The proposed noise reduction methods are evaluated with speaker localizing application applied on the meeting database of the Mistral project. The results show the pros and cons of each method applied on the meeting database.

关键词： Microphones

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Evaluation of areal touch feedback for palpation simulation

Evaluation of areal touch feedback for palpation simulation

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VIS 05: IEEE visualization 2005, Proceedings

作者： Park, Jinah Kim, Sang Youn Kyung, Ki Uk Kwon, Dong Soo Computer Graphics and Visualization Laboratory Information and Communications University Korea Republic of Telerobotics and Control Laboratory Korea Advanced Institute of Science and Technology Korea Republic of Samsung Advanced Institute of Technology Korea Republic of

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