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Toward urban model acquisition from geo-located images

Toward urban model acquisition from geo-located images

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pacific conference on computer graphics and applications

作者： S. Teller Computer Graphics Group MIT Laboratory for Computer Science Cambridge MA USA

High fidelity textured geometric models are a fundamental starting point for computer graphics, simulation, visualization, design, and analysis. Existing tools for acquiring 3D models of large scale (e.g., urban) geometry, from imagery, require significant manual input and suffer other algorithmic scaling limitations. We are pursuing a research and engineering effort to develop a novel sensor and associated geometric algorithms, to achieve fully automated reconstruction from close range color images of textured geometric models representing built urban structures. The sensor is a geo-located camera, which annotates each acquired digital image with metadata recording the date and time of image acquisition, and estimating the position and orientation of the acquiring camera in a global (geodetic) coordinate system. This metadata enables the formulation of reconstruction algorithms which scale well both with the number and spatial density of input images, and the complexity of the reconstructed model. We describe our initial dataset of about four thousand geo-located images acquired through a prototype sensor, manual surveying, and semi automated refinement of navigation information. We demonstrate, for a small of office park on the MIT campus, the operation of fully automated algorithms for generating hemispherical image mosaics, for reconstructing vertical building facades, and for estimating high resolution texture information for each facade. Finally, we describe the status of our efforts, and discuss several significant research and engineering challenges facing the project.

关键词： Urban planning Solid modeling Image sensors Image reconstruction Digital cameras computer graphics Computational modeling Analytical models computer simulation Visualization

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Direct reconstruction of displaced subdivision surface from unorganized points

Direct reconstruction of displaced subdivision surface from ...

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pacific conference on computer graphics and applications

作者： Won Ki Jeong Chang Hun Kim Max Planck Institut für Informatik Saarbruecken Germany Department of Computer Science and Engineering Korea University Seoul South Korea

ISBN: (纸本)0769512275

We propose a new mesh reconstruction algorithm that produces a displaced subdivision mesh directly from unorganized points. The displaced subdivision surface is a new mesh representation that defines a detailed mesh with a displacement map over a smooth domain surface. This mesh representation has several benefits-compact mesh size, piecewise regular connectivity-to overcome limitations of an irregular mesh produced by an ordinary mesh reconstruction scheme, but the original displaced subdivision surface generation algorithm needs an explicit polygonal mesh to be converted. Our approach is producing displaced subdivision surface directly from input points during the mesh reconstruction process. The main ideas of our algorithm are building initial coarse control mesh by the shrink-wrapping like projection and sampling fine surface detail from unorganized points along the each limit vertex normal without any connectivity information of given points. We employ an existing subdivision surface fitting scheme to generate a parametric domain surface, and suggest a surface detail sampling scheme that determines a valid sampling triangle which can be made with combinations of input points. We show several reconstruction examples and applications to show the validity of suggested sampling technique and benefits of the result like multiresolution modeling.

关键词： Surface reconstruction Sampling methods Reconstruction algorithms Surface fitting Clouds computer science Mesh generation Laser modes Probes computer graphics

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Variance invariant adaptive temporal supersampling for motion blurring

Variance invariant adaptive temporal supersampling for motio...

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pacific conference on computer graphics and applications

作者： D. Neilson Yee-Hong Yang Computer Graphics Research Group Department of Computing Science University of Alberta Canada

Adaptive temporal sampling, used to create motion blur in distributed ray tracing, generates more sample points in regions with motion blur than in regions without motion blur. When the number of sample points used on stationary objects in regions with motion blur exceeds the number of sample points used in other regions of the image, the variance in the color of the object can differ between the two regions. This paper identifies the cause of this variance discrepancy, and proposes a modification to existing adaptive temporal sampling algorithms which eliminated it. Our results demonstrate that the variance of stationary objects remains approximately the same throughout the entire image and that the proposed modification is capable of improving the running time of existing adaptive temporal sampling algorithms.

关键词： Image sampling Ray tracing computer graphics Rendering (computer graphics) Optical reflection Layout Equations Pixel Distributed computing Sampling methods

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Triangular Bezier clipping

Triangular Bezier clipping

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pacific conference on computer graphics and applications

作者： S.H.M. Roth P. Diezi M.H. Gross Computer Science Department Swiss Federal Institute of Technology Zurich Switzerland

Introduces a new approach to finding ray-patch intersections with triangular Bernstein-Bezier patches of arbitrary degree. Unlike the approach of *** (1998), which was based on a combination of hierarchical subdivision and a Newton-like iteration scheme, this work extends the concept of Bezier clipping to the triangular domain. The problem of reporting wrong intersections, which was inherent to the original Bezier clipping algorithm of T. Nishita et al. (1990), is investigated and opposed to the triangular case. It turns out that reporting wrong hits is very improbable, even close to impossible, in the triangular setup.

关键词： Ray tracing Tensile stress computer science Paper technology Slabs Chebyshev approximation Polynomials Equations Upper bound

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Visualization of multidimensional, multivariate volume data using hardware-accelerated non-photorealistic rendering techniques

Visualization of multidimensional, multivariate volume data ...

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pacific conference on computer graphics and applications

作者： A. Stompel E.B. Lum Kwan-Liu Ma University of California 슠Davis USA

This paper presents a set of feature enhancement techniques. coupled with hardware-accelerated non-photorealistic rendering for generating more perceptually effective visualizations of multidimensional, multivariate volume data, such as those obtained from typical computational fluid dynamics simulations. For time-invariant data, one or more variables are used to either highlight important features in another variable, or add contextural information to the visualization. For time-varying data, rendering of each time step also takes into account the values at neighboring time steps to reinforce the perception of the changing features in the data over time. With hardware-accelerated rendering, interactive visualization becomes possible leading to increased explorability and comprehension of the data.

关键词： Data visualization Multidimensional systems Rendering (computer graphics) Hardware Computational fluid dynamics Acceleration Computational modeling Application software computer graphics Animation

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Health Informatics and Medical Systems and Biomedical Engineering 1

Health Informatics and Medical Systems and Biomedical Engine...

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丛书名： Communications in computer and Information Science

1000年

作者： Abeer Alsadoon Farzan Shenavarmasouleh Soheyla Amirian Farid Ghareh Mohammadi Hamid R. Arabnia Leonidas Deligiannidis

ISBN: (数字)9783031859083

ISBN: (纸本)9783031859076

This book constitutes the proceedings of the 10th International conference on Health Informatics and Medical Systems and the 10th International conference on Biomedical Engineering, BIOENG 2024, held as part of the 2024 World Congress in computer Science, computer Engineering and Applied Computing, in Las Vegas, USA, during July 22 to July 25, 2024. The 31 HIMS 2024 papers included were carefully reviewed and selected from 141 submissions. BIOENG 2024 received 78 submissions and accepted 13 papers for inclusion in the proceedings. The papers have been organized in topical sections as follows: Biomedical engineering; algorithms, applications and methodologies; health informatics and medical systems; and algorithms, applications and methodologies.

关键词： Systems and Data Security Software Engineering/Programming and Operating Systems computer Imaging, Vision, Pattern Recognition and graphics Artificial Intelligence computer Science, general

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Blending multiple views

Blending multiple views

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pacific conference on computer graphics and applications

作者： R. Raskar Kok-Lim Low Mitsubishi Electric Research Laboratories Inc. USA University of North Carolina Chapel Hill USA

Current blending methods in image-based rendering use local information such as "deviations from the closest views" to find blending weights. They include approaches such as the view-dependent texture mapping and blending fields used in unstructured lumigraph rendering. However, in the presence of depth discontinuities, these techniques do not provide smooth transitions in the target image if the intensities of corresponding pixels in the source images are significantly different (e.g. due to specular highlights). In this paper, we present an image blending technique that allows the use of global visibility and occlusion constraints. Each blending weight now has a global component and a local component, which are due to the view-independent and view-dependent contributions of the source images, respectively. Being view-independent, the global components can be computed in a preprocessing stage. Traditional graphics hardware is exploited to accelerate the computation of the global blending weights.

关键词： Cameras Layout Rendering (computer graphics) Pixel Geometry graphics Solid modeling Hardware Acceleration Interpolation

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Simulation and control of physical phenomena in computer graphics

Simulation and control of physical phenomena in computer gra...

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pacific conference on computer graphics and applications

作者： J. Stam Alias Systems Toronto ONT Canada

In computer graphics applications such as feature animation and games there is a need to produce convincing simulations of phenomena such as smoke, water, cloth and rigid bodies. Computational physics is the natural framework for such simulations. The physical equations describing most of these phenomena are well known and have been extensively studied over the last couple of centuries by the physics community. Which solution technique to use in practice depends on the application. In computer graphics it is desirable to have fast and stable simulations. Ideally, the simulations should run in realtime. This is important of course in games but also in movie production houses where animators have to fine tune the parameters of the simulation. On the other hand it is also desirable that these simulations are easy to implement. This makes the code easier to maintain in a commercial system. Our experience has been that good solutions very often result in simple algorithms which are relatively easy to code. This paper mainly focuses on the simulation of fluids such as smoke, water and fire. Our fluid solver which was first introduced in Stam (1999) relies on a spatial discretization of space into voxels. The physical quantities describing the fluid such as velocity and density are assumed to be constant in each voxel. These values are updated over each time step to create an animation of a fluid flow.

关键词： Computational modeling computer simulation computer graphics Animation Application software Physics computing Equations Motion pictures Production Fires

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Line Drawing as a Dynamic Process

Line Drawing as a Dynamic Process

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pacific conference on computer graphics and applications

作者： Donald H. House Mayank Singh Visualization Laboratory Texas A&M University Texas USA

We introduce a novel mechanism for creating line drawings from three-dimensional models, which captures the dynamic nature of the drawing process. The approach takes into account the interaction between the moving human hand and the drawing instrument. This is demonstrated as applied to the specific problem of making silhouette drawings from polygonal models. A control system drives a pen by tracking the contour of the polygonal model as projected onto the drawing surface, thus mimicking hand motion. The pen is treated as a physically-based object with momentum, giving the generated lines a smooth hand-drawn quality. Lines are rendered using a ribbon metaphor, where thickness is determined by the twist of the ribbon. The twist angle can be dependent upon various attributes such as perspective depth, the curvature of the line, and the lighting of the model. A number of examples are presented, ranging from tightly controlled drawings to expressive gestural drawings.

关键词： Rendering (computer graphics) Instruments Shape Target tracking computer graphics Control system synthesis Surface treatment Application software Visualization Laboratories

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Efficient coding of non-triangular mesh connectivity

Efficient coding of non-triangular mesh connectivity

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pacific conference on computer graphics and applications

作者： B. Kronrod C. Gotsman Computer Science Department Technion-Israel Institute of Technology Haifa Israel

Describes an efficient algorithm for coding the connectivity information of general polygon meshes. In contrast to most existing algorithms, which are suitable only for triangular meshes and pay a penalty for the treatment of non-triangular faces, this algorithm codes the connectivity information in a direct manner. Our treatment of the special case of triangular meshes is shown to be equivalent to the Edgebreaker algorithm. Using our methods, any triangle mesh may be coded in no more than two bits/triangle (approximately four bits/vertex), a quadrilateral mesh in no more than 3.5 bits/quad (approximately 3.5 bits/vertex), and the most common case of a quadrilateral mesh with few triangles in no more than four bits/polygon.

关键词： computer science Algorithm design and analysis Surgery Decoding Upper bound

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