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11th pacific conference on computer graphics and applications

作者： Theobalt, C Carranza, J Magnor, MA Seidel, HP Max Planck Inst Informat Saarbrucken Germany

ISBN: (纸本)0769520286

High-quality non-intrusive human motion capture is necessary for acquistion of model-based free-viewpoint video of human actors. Silhouette-based approaches have demonstrated that they are able to accurately recover a large range of human motion from multi-view video. However, they fail to make use of all available information, specifically that of texture information. This paper presents an algorithm that uses motion fields constructed from optical flow in multi-view video sequences. The use of motion fields augments the silhoutte-based method by incorporating texture-information into the tracking process. The algorithm is a key-component in a larger free-viewpoint video system of human actors. Our results demonstrate that our method accurately estimates pose parameters and allows for realistic texture generation in 3D video sequences.

关键词： computer graphics computer vision Humans Image generation Image motion analysis Motion estimation Parameter estimation Rendering (computer graphics) Tracking Video sequences

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Patch-type Segmentation of Voxel Shapes using Simplified Surface Skeletons

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computer graphics FORUM 2008年第7期27卷 1837-1844页

作者： Reniers, Dennie Telea, Alexandru Eindhoven Univ Technol Dept Math & Comp Sci NL-5600 MB Eindhoven Netherlands Univ Groningen Inst Math & Comp Sci NL-9700 AB Groningen Netherlands

We present a new method for decomposing a 3D voxel shape into disjoint segments using the shape's simplified surface-skeleton. The surface skeleton of a shape consists of 2D manifolds inside its volume. Each skeleton point has a maximally inscribed ball that touches the boundary in at least two contact points. A key observation is that the boundaries of the simplified fore- and background skeletons map one-to-one to increasingly fuzzy, soft convex, respectively concave, edges of the shape. Using this property, we build a method for segmentation of 3D shapes which has several desirable properties. Our method segments both noisy shapes and shapes with soft edges which vanish over low-curvature regions. Multiscale segmentations can be obtained by varying the simplification level of the skeleton. We present a voxel-based implementation of our approach and illustrate it on several realistic examples.

关键词： THREE-dimensional imaging computer-aided design computer art ART ART & technology DIGITAL technology

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View-dependent layered projective texture maps 11

View-dependent layered projective texture maps

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11th pacific conference on computer graphics and applications

作者： Reche-Martinez, A Drettakis, G INRIA REVES Sophia Antipolis France

ISBN: (纸本)0769520286

Capturing and rendering of real scenes in an immersive virtual environment is still a challenging task. We present a novel workflow, using high-quality, view-dependent projective texturing at low texture memory cost, while reinforcing artist's control over image quality. Photographs of a real scene are first used to create a 3D model with standard tools. Our method automatically orders geometry into optimized visibility layers for each photograph. These layers are subsequently used to create standard 2D image-editing layers, enabling artists to fill in missing texture using standard techniques such as clone brushing. The result of this preprocess is used by our novel layered projective texture rendering algorithm, which has low texture memory consumption, high interactive image quality and avoids the need for subdividing geometry for visibility. We show results of our implementation on a real-world project.

关键词： Application software Automatic control computer displays computer graphics Geometry Image quality Image reconstruction Layout Rendering (computer graphics) Virtual environment

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Density measure for line-drawing simplification.

Density measure for line-drawing simplification.

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12th pacific conference on computer graphics and applications (PG 2004)

作者： Grabli, S Durand, F Sillion, FX ARTIS GRAVIR-IMAG INRIA MIT CSAIL United States GRAVIR IMAG Laboratory France

ISBN: (纸本)0769522343

We present an approach for clutter control in NPR line drawing where measures of view and drawing complexity drive the simplification or omission of lines. We define two types of density, information: the a-priori density and the causal density, and use them to control which parts of a drawing need simplification. The a-priori density is a measure of the visual complexity of the potential drawing and is computed on the complete arrangement of lines from the view. This measure affords a systematic approach for characterizing the structure of cluttered regions in terms of geometry, scale, and directionality. The causal density measures the spatial complexity of the current state of the drawing as strokes are added, allowing for clutter control through line omission or stylization. We show how these density measures permit a variety of pictorial simplification styles where complexity is reduced either uniformly, or in a spatially-varying manner through indication.

关键词： computer graphics

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Variance invariant adaptive temporal supersampling for motion blurring 11

Variance invariant adaptive temporal supersampling for motio...

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11th pacific conference on computer graphics and applications

作者： Neilson, D Yang, YH Univ Alberta Comp Graph Res Grp Edmonton AB T6G 2M7 Canada

ISBN: (纸本)0769520286

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

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On-line graphics recognition 10

On-line graphics recognition

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10th pacific conference on computer graphics and applications

作者： Jin, XY Liu, WY Sun, JY Sun, ZX Nanjing Univ State Key Lab Novel Software Technol Nanjing 210093 Peoples R China

ISBN: (纸本)0769517846;0769517854

A novel and fast shape classification and regularization algorithm for on-line sketchy graphics recognition is proposed. We divided the on-line graphics recognition process into four stages: preprocessing, shape classification, shape fitting, and regularization. The Attraction Force Model is proposed to progressively combine the vertices on the input sketchy stroke and reduce the total number of vertices before the type of shape can be determined. After that, the shape is fitted and gradually rectified to a regular one, thus the regularized shape fits the user-intended one precisely. Experimental results show that this algorithm can yield good recognition precision (averagely above 90%) and fine regularization effect with a fast speed. Consequently, it is especially suitable for weak computation environment such as PDAs, which solely depends on a pen-based user interface.

关键词： Classification algorithms computer graphics computer science Decision trees Filters Image segmentation Personal digital assistants Shape Software algorithms Sun

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Automatic Facsimile of Chinese Calligraphic Writings

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computer graphics FORUM 2008年第7期27卷 1879-1886页

作者： Xu, Songhua Jiang, Hao Jin, Tao Lau, Francis C. M. Pan, Yunhe Zhejiang Univ Coll Comp Sci & Technol Hangzhou 310027 Zhejiang Peoples R China Yale Univ Dept Comp Sci New Haven CT 06520 USA Univ Hong Kong Dept Comp Sci Hong Kong Hong Kong Peoples R China

To imitate personal handwritings is non-trivial. In this paper, we attempt to address the challenging problem of automatic handwriting facsimile. We focus on Chinese calligraphic writings due to their rich variation in style, high artistic values and also the fact that they are among the most difficult candidates for the problem. We first analyze the structures and shapes of the constituent components, i.e., strokes and radicals, of characters in sample calligraphic writings by the same writer. To generate calligraphic writing in the style of the writer, we facsimile the individual character elements as well as the layout relationships used to compose the character, both in the writer's personal writing style. To test our algorithm, we compare our facsimileing results of Chinese calligraphic writings with the original writings. Our results are found to be acceptable for most cases, some of which are difficult to differentiate from the real ones. More results and supplementary materials are provided in our project website at http://***/similar to songhua/facsimile/.

关键词： I.2.1 [Artificial Intelligence]: applications and Expert Systems I.3.3 [computer graphics]: Picture/Image Generation J.5.C [Arts and Humanities]: Fine arts

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Lightweight face relighting 11

Lightweight face relighting

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11th pacific conference on computer graphics and applications

作者： Paris, S Sillion, FX Quan, L ARTIS GRAVIR - IMAG France HKUST France

ISBN: (纸本)0769520286

In this paper we present a method to relight human faces in real time, using consumer-grade graphics cards even with limited 3D capabilities. We show how to render faces using a combination of a simple, hardware-accelerated parametric model simulating skin shading and a detail texture map, and provide robust procedures to estimate all the necessary parameters for a given face. Our model strikes a balance between the difficulty of realistic face rendering (given the yen specific reflectance properties of skin) and the goal of real-time rendering with limited hardware capabilities. This is accomplished by automatically generating an optimal set of parameters for a simple rendering model. We offer a discussion of the issues in face rendering to discern the pros and cons of various rendering models and to generalize our approach to most of the current hardware constraints. We provide results demonstrating the usability of our approach and the improvements we introduce both in the performance and in the visual quality of the resulting faces.

关键词： Face graphics Hardware Humans Parametric statistics Reflectivity Rendering (computer graphics) Robustness Skin Usability

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Proxy-guided Image-based Rendering for Mobile Devices

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computer graphics FORUM 2016年第7期35卷 353-362页

作者： Reinert, Bernhard Kopf, Johannes Ritschel, Tobias Cuervo, Eduardo Chu, David Seidel, Hans-Peter MPI Informat Saarbrucken Germany Microsoft Res Redmond WA USA UCL London WC1E 6BT England Facebook Menlo Pk CA USA Google Mountain View CA USA

VR headsets and hand-held devices are not powerful enough to render complex scenes in real-time. A server can take on the rendering task, but network latency prohibits a good user experience. We present a new image-based rendering (IBR) architecture for masking the latency. It runs in real-time even on very weak mobile devices, supports modern game engine graphics, and maintains high visual quality even for large view displacements. We propose a novel server-side dual-view representation that leverages an optimally-placed extra view and depth peeling to provide the client with coverage for filling disocclusion holes. This representation is directly rendered in a novel wide-angle projection with favorable directional parameterization. A new client-side IBR algorithm uses a pre-transmitted level-of-detail proxy with an encaging simplification and depth-carving to maintain highly complex geometric detail. We demonstrate our approach with typical VR/mobile gaming applications running on mobile hardware. Our technique compares favorably to competing approaches according to perceptual and numerical comparisons.

关键词： IMAGING systems IMAGE analysis IMAGE processing VIRTUAL reality computer simulation PARAMETERIZATION

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Albero: A Visual Analytics Approach for Probabilistic Weather Forecasting

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computer graphics FORUM 2017年第7期36卷 135-144页

作者： Diehl, A. Pelorosso, L. Delrieux, C. Matkovic, K. Ruiz, J. Groeller, M. E. Bruckner, S. Univ Konstanz Constance Germany Univ Buenos Aires Buenos Aires DF Argentina South Natl Univ Bahia Blanca Buenos Aires Argentina VRVis Res Ctr Vienna Austria UBA CONICET CIMA DCAOFCEN Buenos Aires DF Argentina Vienna Univ Technol Vienna Austria Univ Bergen Bergen Norway

Probabilistic weather forecasts are amongst the most popular ways to quantify numerical forecast uncertainties. The analog regression method can quantify uncertainties and express them as probabilities. The method comprises the analysis of errors from a large database of past forecasts generated with a specific numerical model and observational data. Current visualization tools based on this method are essentially automated and provide limited analysis capabilities. In this paper, we propose a novel approach that breaks down the automatic process using the experience and knowledge of the users and creates a new interactive visual workflow. Our approach allows forecasters to study probabilistic forecasts, their inner analogs and observations, their associated spatial errors, and additional statistical information by means of coordinated and linked views. We designed the presented solution following a participatory methodology together with domain experts. Several meteorologists with different backgrounds validated the approach. Two case studies illustrate the capabilities of our solution. It successfully facilitates the analysis of uncertainty and systematic model biases for improved decision-making and process-quality measurements.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.3 [computer graphics]: Picture/Image Generation—Viewing algorithms I.3.6 [computer graphics]: Methodology and Techniques—Interaction techniques I.3.8 [computer graphics]: applications—Probabilistic Weather Forecasting

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