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Convergence of map seeking circuits

Convergence of map seeking circuits

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19th brazilian symposium on computer graphics and image processing (SIBGRAPI 2006)

作者： Gedeon, Tomas Arathorn, David Montana State Univ Dept Math Sci Bozeman MT 59715 USA Montana State Univ Gen Intelligence Corp Ctr Computat Biol Bozeman MT 59715 USA

the map-seeking circuit (MSC) is an explicit biologically-motivated computational mechanism which provides practical solution of problems in object recognition, image registration and stabilization, limb inverse-kinematics and other inverse problems which involve transformation discovery. We formulate this algorithm as discrete dynamical system on a set Delta = Pi(L)(l=1)Delta((l)), where each Delta((l)) is a compact subset of a nonnegative orthant of R-n, and show that for an open and dense set of initial conditions in Delta the corresponding solutions converge to either a vector with unique nonzero element in each Delta((l)) or to a zero vector. the first result implies that the circuit finds a unique best mapping which relates reference pattern to a target pattern;the second result is interpreted as "no match found". these results verify numerically observed behavior in numerous practical applications.

关键词： map seeking circuits computer vision dynamical systems Lyapunov function

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Portable Digital In-line Holography Platform for Sperm Cell Visualization and Quantification 27

Portable Digital In-line Holography Platform for Sperm Cell ...

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27th SIBGRAPI Conference on graphics, Patterns and images (SIBGRAPI)

作者： Sobieranski, Antonio Carlos Inci, Fatih Tekin, H. Cumhur Comunello, Eros von Wangenheim, Aldo Demirci, Utkan Univ Fed Parana Dept Informat BR-80060000 Curitiba Parana Brazil Harvard Univ Brigham & Womens Hosp Bioacoust MEMS Med BAMM Lab Ctr Biomed EngnDept MedMed Sch Boston MA 02115 USA Univ Fed Santa Catarina LAPIX Image Proc & Comp Graph Lab INCoD Natl Brazilian Inst Digital Convergence BR-88040900 Florianopolis SC Brazil MIT Harvard MIT Hlth Sci & Technol Div Cambridge MA 02139 USA

ISBN: (纸本)9781479942602

In this paper a new portable Digital In-line Holography Platform for biological micro-scale imaging of sperm samples is presented. this platform is based on the shadow imaging principle, where biological samples are illuminated by a nearly coherent light source, and shadows are recorded into a CMOS imaging sensor with no lens requirement. the projected shadows present holographic signatures, storing more than bi-dimensional information of the analyzed sample. To improve resolution and suppress noise of the acquired holograms, a multi-frame technique based on high-dynamic range imaging combined with summation of consecutive frames over time was used. Finally, decoding of holograms is performed by an efficient and fast phase-recovery method, where morphological details of the sample can be obtained similarly a conventional bright-field microscopy image. From an image formation point of view, the proposed portable approach is able to visualize biological samples in high synthetic numerical aperture values with a spatial resolution of 1-2 mu m on a field-of-view of approximate to 30 mm(2). this field-of-view is consistently bigger than a conventional microscope imaged area with no mosaic reconstruction, and the achieved resolution is obtained using a single illumination source with no moving parts, array of LEDs or sift of the light source. Validation of the proposed portable approach was performed using various human samples, where conventional microscopy was used for confirmation purposes.

关键词： Biological On-Chip Imaging Digital In-line Holography Platform Lens-less Shadow Imaging Sperm Morphology Visualization

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A load-balancing strategy for sort-first distributed rendering

A load-balancing strategy for sort-first distributed renderi...

引用

brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： F. Abraham W. Celes R. Cerqueira J.L. Campos Tecgraf-Computer Science Department PUC-Rio Rio de Janeiro Rio de Janeiro Brazil

In this paper we present a multi-threaded sort-first distributed rendering system. In order to achieve load balance among the rendering nodes, we propose a new partitioning scheme based on the rendering time of the previous frame. the proposed load-balancing algorithm is very simple to be implemented and works well for both geometry and rasterization-bound models. We also propose a strategy to assign tiles to rendering nodes that effectively uses the available graphics resources, thus improving rendering performance.

关键词： Rendering (computer graphics) graphics Layout Tiles Partitioning algorithms Workstations Delay Clustering algorithms Personal communication networks Displays

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Parabolic Polygons and Discrete Affine Geometry

Parabolic Polygons and Discrete Affine Geometry

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brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： Marcos Craizer thomas Lewiner Jean-marie Morvan Department of Mathematics PUC-Rio Brazil Université Claude Bernard Lyon France

Geometry processing applications estimate the local geometry of objects using information localized at points. they usually consider information about the normal as a side product of the points coordinates. this work proposes parabolic polygons as a model for discrete curves, which intrinsically combines points and normals. this model is naturally affine invariant, which makes it particularly adapted to computer vision applications. this work introduces estimators for affine length and curvature on this discrete model and presents, as a proof-of-concept, an affine invariant curve reconstruction

关键词： Application software image reconstruction Information geometry computer vision Mathematics computer applications Numerical stability Surface reconstruction Robustness Solid modeling

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Old movie restoration using opening by surface

Old movie restoration using opening by surface

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brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： S.J.F. Guimaraes A. De Albuquerque Araujo G. Cerqueira Departamento de Ciência da Computacao NPDI/DCC/UFMG Belo Horizonte Minas Gerais Brazil

Because of their storage conditions, old movies may present different defect types of different shapes and sizes. We propose a method for old movie restoration using opening by surface which eliminates image informati... 详细信息

关键词： Motion pictures Surface morphology Shape Surface reconstruction image restoration image reconstruction History image sequences Pixel Motion detection

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Graphic simulation for virtual prototyping with Java3D

Graphic simulation for virtual prototyping with Java3D

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brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： F.R. Miranda C.S.D. Santos J.E. Kogler Faculade SENAC-Rua Tito Sao Paulo Brazil Escola Politecnica da Universidade de Sao Paulo Sao Paulo Brazil

We report some issues involved in the construction of an interactive, interoperable application, whose primary purpose is to be used as a virtual mockup. this graphic tool was tailored for machine vision application prototyping, to cope with metrological settings of large part assemblies. Some relevant aspects of designing interactive 3D applications will be discussed, including an account of some modern graphics libraries, particularly Java 3D. the achieved results, including some interesting byproducts of this work, to be publicly distributed soon, are also presented.

关键词： Virtual prototyping Java computer graphics Computational modeling computer simulation image processing

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A computer-Assisted Colorization Algorithm based on Topological Difference

A Computer-Assisted Colorization Algorithm based on Topologi...

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brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： Hedlena Bezerra Bruno Feijo Luiz Velho Pontifícia Universidade Católica do Rio de Janeiro France ARTIS/GRAVIR/IMAG-INRIA France IMPA-Instituto de Matemática Pura e Aplicada Brazil ARTIS/GRAVIR/IMAG-INRIA Brazil

Region-based approaches to cel painting typically use shape similarity and topology relations between regions of consecutive animation frames. this paper presents a new colorization algorithm based on topological differences defined over a hierarchical graph of adjacent regions, which allows an almost full automatic colorization process. Also this paper discusses other attributes that improve the solution of the image association problem

关键词： Shape Painting Topology Pipelines Facial animation Inverse problems Interpolation image analysis Performance analysis computer graphics

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PROCEEDINGS - 14th INTERNATIONAL symposium ON INDUSTRIAL ROBOTS, 7th INTERNATIONAL CONFERENCE ON INDUSTRIAL ROBOT TECHNOLOGY.

PROCEEDINGS - 14TH INTERNATIONAL SYMPOSIUM ON INDUSTRIAL ROB...

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Proceedings - 14th International symposium on Industrial Robots, 7th International Conference on Industrial Robot Technology.

ISBN: (纸本)0903608561

the volume contains 74 papers presented at the meeting. the papers are grouped under general topics that include robotic diffusion, human-robot interaction, economic evaluation, safety, systems, performance testing, assembly, mechanical design, control methods, arc welding, accessories, image processing, new robot concepts, sensors and analysis, computer-aided robotics, and robot trends. Specific subjects covered include computer-aided synthesis of least cost assembly systems, systematic robot-related accidents and standardization of safety measures for robots, robotics in spray-up processes, automated engine assembly, data driven automation, integrated vision-based work stations, study of special configurations of manipulators, and others.

关键词： ROBOTICS

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Runtime support for adaptive spatial partitioning and inter-kernel communication on GPUs 26

Runtime support for adaptive spatial partitioning and inter-...

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26th International symposium on computer Architecture and High Performance Computing, SBAC-PAD 2014

作者： Ukidave, Yash Kalra, Charu Kaeli, David Mistry, Perhaad Schaa, Dana Department of Electrical and Computer Engineering Northeastern University BostonMA United States Advanced Micro Devices United States

ISBN: (纸本)9781479969043

GPUs have gained tremendous popularity in a broad range of application domains. these applications possess varying grains of parallelism and place high demands on compute resources - many times imposing real-time constraints, requiring flexible work schedules, and relying on concurrent execution of multiple kernels on the device. these requirements present a number of challenges when targeting current GPUs. To support this class of applications, and to take full advantage of the large number of compute cores present on the GPU, we need a new mechanism to support concurrent execution and provide flexible mapping of compute kernels to the GPU. In this paper, we describe a new scheduling mechanism for dynamic spatial partitioning of the GPU, which adapts to the current execution state of compute workloads on the device. To enable this functionality, we extend the OpenCL runtime environment to map multiple command queues to a single device, and effectively partitioning the device. the result is that kernels that can benefit from concurrent execution on a partitioned device can effectively utilize the full compute resources on the GPU. To accelerate next-generation workloads, we also support an inter-kernel communication mechanism that enables concurrent kernels to interact in a producer-consumer relationship. the proposed partitioning mechanism is evaluated using real world applications taken from signal and image processing, linear algebra, and data mining domains. For these performance-hungry applications we achieve a 3.1X performance speedup using a combination of the proposed scheduling scheme and inter-kernel communication, versus relying on the conventional GPU runtime. © 2014 IEEE.

关键词： graphics processing unit

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On estimating local geometric properties of intersection curves

On estimating local geometric properties of intersection cur...

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brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： Wu Shin-Ting O. Alessio S.I.R. Costa Electrical and Computer Engineering Faculty State University of Campinas Sao Paulo Brazil Institute of Mathematics State University of Campinas Sao Paulo Brazil

the paper presents a simple and robust algorithm for estimating the local geometric properties of intersection curves, namely the tangent, normal, binormal, curvature and torsion vectors at any point. In addition, two... 详细信息

关键词： Sorting Mathematics Robustness Taylor series Differential equations Computational geometry Testing

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