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检索条件"任意字段=14th Brazilian Symposium on Computer Graphics and Image Processing"

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Plausible image Based Soft Shadows Using Occlusion Textures

Plausible Image Based Soft Shadows Using Occlusion Textures

引用

brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： Elmar Eisemann Xavier Decoret ARTIS-GRAVIR IMAG-INRIA France

this paper presents a novel image-based approach to render plausible soft shadows for complex dynamic scenes with rectangular light sources. the algorithm's performance is mostly independent of the scene complexity and the source's size. Occluders and receivers do not need to be separated and no knowledge about the scene representation is required, making the method easy to use. the main idea is to approximate the occlusion in the scene with pre-filtered occlusion textures. the visibility of the light source at a point in space is estimated by accumulating the occlusion caused by each texture, using a novel formula based on probabilities

关键词： Layout Light sources Rendering (computer graphics) computer graphics Runtime Hardware image coding Shadow mapping Filtering Statistics

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Automatic sliding window operation optimization for FPGA-based computing boards

Automatic sliding window operation optimization for FPGA-bas...

引用

14th Annual IEEE symposium on Field-Programmable Custom Computing Machines, FCCM 2006

作者： Haiqian, Yu Leeser, Miriam Department of Electrical and Computer Engineering Northeastern University Boston MA United States

ISBN: (纸本)0769526616

FPGA-based computing boards are frequently used as hardware accelerators for image processing algorithms based on sliding window operations (SWOs). SWOs are both computationally intensive and data intensive and benefit from hardware acceleration with FPGAs, especially for delay sensitive applications. the current design process requires that, for each specific application using SWOs with different size of window, image, etc.;a detail design must be completed before a realistic estimate of the achievable speedup can be obtained. We present an automated tool, Sliding Window Operation Optimization (SWOOP), that generates the estimate of speedup for a high performance design before detailed implementation is complete. the achievable speedup is determined by the area of the FPGA, or, more often, the memory bandwidth to the processing elements. the memory bandwidth to each processing element is a combination of bandwidth to the FPGA and the efficient use of on-chip RAM as a data cache. SWOOP uses analytic techniques to automatically determine the number of parallel processing elements to implement on the FPGA, the assignment of input and output data to on-board memory, and the organization of data in on-chip memory to most effectively keep the processing elements busy. the result is a block layout of the final design, its memory architecture, and a measure of the achievable speedup. the results, compared to manual designs, show that the estimates obtained using SWOOP are very accurate. © 2006 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Hardware-assisted Rendering of CSG Models

Hardware-assisted Rendering of CSG Models

引用

brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： Fabiano Romeiro Luiz Velho Luiz Henrique De Figueiredo Harvard University USA IMPA Brazil

Current methods that interactively render reasonably complex CSG objects are image based and are severely bandwidth limited. this paper presents a new approach to ray-tracing CSG objects composed of convex primitives that combines spatial subdivision and ray-tracing methods. By performing spatial subdivision on the CSG object until locally it is simple enough to be rendered effectively and efficiently on a GPU, we are able to share the load more evenly between the CPU and the GPU and depend less on bandwidth and more on GPU instruction throughput than current methods, hence obtaining better scalability with newer hardware

关键词： Rendering (computer graphics) Hardware Bandwidth throughput computer graphics Ray tracing Scalability Solid modeling Process design image converters

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Parabolic Polygons and Discrete Affine Geometry

Parabolic Polygons and Discrete Affine Geometry

引用

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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A computer-Assisted Colorization Algorithm based on Topological Difference

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

引用

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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GPU-Based Cell Projection for Interactive Volume Rendering

GPU-Based Cell Projection for Interactive Volume Rendering

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brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： Ricardo Marroquim Andre Maximo Ricardo Farias Claudio Esperanca Universidade Federal do Rio de Janeiro Brazil

We present a practical approach for implementing the projected tetrahedra (PT) algorithm for interactive volume rendering of unstructured data using programmable graphics cards. Unlike similar works reported earlier, our method employs two fragment shaders, one for computing the tetrahedra projections and another for rendering the elements. We achieve interactive rates by storing the model in texture memory and avoiding redundant projections of implementations using vertex shaders. Our algorithm is capable of rendering over 2.0 M Tet/s on current graphics hardware, making it competitive with recent ray-casting approaches, while occupying a substantially smaller memory footprint

关键词： Transfer functions Hardware Rendering (computer graphics) Projection algorithms computer graphics Nonlinear optics Optical attenuators Linear approximation Software algorithms Biomedical imaging

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Robust adaptive meshes for implicit surfaces

Robust adaptive meshes for implicit surfaces

引用

brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： Afonso Paiva Helio Lopes thomas Lewiner Luiz Henrique De Figueiredo Department of Mathematics PUC-Rio Brazil IMPA Rio de Janeiro Brazil

this work introduces a robust algorithm for computing good polygonal approximations of implicit surfaces, where robustness entails recovering the exact topology of the implicit surface. Furthermore, the approximate triangle mesh adapts to the geometry and to the topology of the real implicit surface. this method generates an octree subdivided according to the interval evaluation of the implicit function in order to guarantee the robustness, and to the interval automatic differentiation in order to adapt the octree to the geometry of the implicit surface. the triangle mesh is then generated from that octree through an enhanced dual marching

关键词： Robustness Topology Geometry Solid modeling Arithmetic Surface cracks Mathematics Isosurfaces Mesh generation Rendering (computer graphics)

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A scaled morphological toggle operator for image transformations

A scaled morphological toggle operator for image transformat...

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brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： Neucimar Jeronimo Leite Leyza Baldo Dorini Instituto de Computação UNICAMP Universidade Estadual de Campinas Sao Paulo Brazil

Scale dependent signal representations have proved to be useful in several image processing applications. In this paper, we define a toggle operator for binarization/segmentation purposes based on scaled versions of an image transformed by morphological operations. the toggle decision rule, determining the new value of a pixel, considers local spatial information, in contrast to other multiscale approaches that takes into account mainly global information (e.g., the scale signal under study). We show that the proposed operator can identify significant image extrema information in such a way that when it is used in a binarization process yields very good segmentation and filtering results. Our algorithm is validated against known threshold-based segmentation methods using images of different classes and subjected to different lighting conditions

关键词： image segmentation image processing Signal processing Morphology Signal representations Morphological operations Information filtering Information filters Filtering theory Gray-scale

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Motion Segmentation using Mathematical Morphology

Motion Segmentation using Mathematical Morphology

引用

brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： Arnaldo Camara Lara Roberto Jr. Hirata Instituto de Matemática e Estatística University of São Paulo Sao Paulo Brazil

Motion segmentation is one of the first steps in image sequence applications. the problem has been extensively studied and approached in several ways but it remains a difficult task even for sequences acquired by stationary cameras. In this paper we propose a novel algorithm that is based on mathematical morphology. the algorithm is simple to be implemented, less subject to lighting changes and more robust to false positives. It has been tested in security cameras' image sequences showing promising results. Some algorithms from literature have been implemented and compared to the one described here

关键词： Motion segmentation computer vision Morphology image sequences Cameras Robustness Testing Layout Statistics Computational efficiency

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Vector field reconstruction from sparse samples with applications

Vector field reconstruction from sparse samples with applica...

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brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： Marcos Lage Fabiano Petronetto Afonso Paiva Helio Lopes thomas Lewiner Geovan Tavares PUC-Rio-Departamento de Matemática Laboratório Matmídia Rio de Janeiro Brazil

We present a novel algorithm for 2D vector field reconstruction from sparse set of points-vectors pairs. Our approach subdivides the domain adaptively in order to make local piecewise polynomial approximations for the field. It uses partition of unity to blend those local approximations together, generating a global approximation for the field. the flexibility of this scheme allows handling data from very different sources. In particular, this work presents important applications of the proposed method to velocity and acceleration fields' analysis, in particular for fluid dynamics visualization

关键词： Least squares approximation Function approximation image reconstruction Computational modeling Hydrodynamics Acceleration computer graphics computer simulation Partitioning algorithms Deformable models

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