30-Issue 6

Permanent URI for this collection

https://diglib.eg.org/handle/10.2312/166

Adaptive Records for Irradiance Caching

[meta data] [files: ]
Ribardière, Mickaël
; 
Carré, Samuel
; 
Bouatouch, Kadi

Implicit Hierarchical Quad‐Dominant Meshes

[meta data] [files: ]
Panozzo, Daniele
; 
Puppo, Enrico

Scale Space Meshing of Raw Data Point Sets

[meta data] [files: ]
Digne, Julie
; 
Morel, Jean‐Michel
; 
Souzani, Charyar‐Mehdi
; 
Lartigue, Claire

General Spectral Camera Lens Simulation

[meta data] [files: ]
Steinert, B.
; 
Dammertz, H.
; 
Hanika, J.
; 
Lensch, H. P. A.

Exploring Non‐Linear Relationship of Blendshape Facial Animation

[meta data] [files: ]
Liu, Xuecheng
; 
Xia, Shihong
; 
Fan, Yiwen
; 
Wang, Zhaoqi

Efficient Depth‐of‐Field Rendering with Adaptive Sampling and Multiscale Reconstruction

[meta data] [files: ]
Chen, Jiating
; 
Wang, Bin
; 
Wang, Yuxiang
; 
Overbeck, Ryan S.
; 
Yong, Jun‐Hai
; 
Wang, Wenping

Improved Model‐ and View‐Dependent Pruning of Large Botanical Scenes

[meta data] [files: ]
Neubert, B.
; 
Pirk, S.
; 
Deussen, O.
; 
Dachsbacher, C.

Visual Analysis of Large Graphs: State-of-the-Art and Future Research Challenges

[meta data] [files: ]
Landesberger, T. von
; 
Kuijper, A.
; 
Schreck, T.
; 
Kohlhammer, J.
; 
Wijk, J.J. van
; 
Fekete, J.‐D.
; 
Fellner, Dieter W.

A Survey on Shape Correspondence

[meta data] [files: ]
Kaick, Oliver van
; 
Zhang, Hao
; 
Hamarneh, Ghassan
; 
Cohen‐Or, Daniel

Fast Mean‐Curvature Flow via Finite‐Elements Tracking

[meta data] [files: ]
Chuang, Ming
; 
Kazhdan, Michael

A Survey of Image Statistics Relevant to Computer Graphics

[meta data] [files: ]
Pouli, Tania
; 
Cunningham, Douglas W.
; 
Reinhard, Erik

The State of the Art in Topology‐Based Visualization of Unsteady Flow

[meta data] [files: ]
Pobitzer, Armin
; 
Peikert, Ronald
; 
Fuchs, Raphael
; 
Schindler, Benjamin
; 
Kuhn, Alexander
; 
Theisel, Holger
; 
Matković, Krešimir
; 
Hauser, Helwig

Flexible and Accurate Transparent - Object Matting and Compositing Using Refractive Vector Field

[meta data] [files: ]
Duan, Qi
; 
Zheng, Jianmin
; 
Cai, Jianfei

Extending Backward Polygon Beam Tracing to Glossy Scattering Surfaces

[meta data] [files: ]
Duvenhage, B.
; 
Bouatouch, K.
; 
Kourie, D. G.

Diffusion‐Based Snow Cover Generation

[meta data] [files: ]
Festenberg, Niels v.
; 
Gumhold, Stefan

New EUROGRAPHICS Fellows

[meta data] [files: ]

Event report: Eurographics 2011 Workshop on 3D Object Retrieval (EG 3DOR'2011)

[meta data] [files: ]

Report of The Statutory Auditors to the General Meeting of The Members Of Eurographics Association Geneva

[meta data] [files: ]

A Linear Variational System for Modelling From Curves

[meta data] [files: ]
Andrews, James
; 
Joshi, Pushkar
; 
Carr, Nathan

Event report: Symposium on Computer Animation 2010

[meta data] [files: ]

BibTeX (30-Issue 6)
                
@article{
10.1111:j.1467-8659.2010.01846.x,

journal = {Computer Graphics Forum},
title = {{
Adaptive Records for Irradiance Caching}},

author = {
Ribardière, Mickaël
 and 
Carré, Samuel
 and 
Bouatouch, Kadi
},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2010.01846.x}

}
                
@article{
10.1111:j.1467-8659.2011.01847.x,

journal = {Computer Graphics Forum},
title = {{
Implicit Hierarchical Quad‐Dominant Meshes}},

author = {
Panozzo, Daniele
 and 
Puppo, Enrico
},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.01847.x}

}
                
@article{
10.1111:j.1467-8659.2011.01848.x,

journal = {Computer Graphics Forum},
title = {{
Scale Space Meshing of Raw Data Point Sets}},

author = {
Digne, Julie
 and 
Morel, Jean‐Michel
 and 
Souzani, Charyar‐Mehdi
 and 
Lartigue, Claire
},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.01848.x}

}
                
@article{
10.1111:j.1467-8659.2011.01851.x,

journal = {Computer Graphics Forum},
title = {{
General Spectral Camera Lens Simulation}},

author = {
Steinert, B.
 and 
Dammertz, H.
 and 
Hanika, J.
 and 
Lensch, H. P. A.
},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.01851.x}

}
                
@article{
10.1111:j.1467-8659.2011.01852.x,

journal = {Computer Graphics Forum},
title = {{
Exploring Non‐Linear Relationship of Blendshape Facial Animation}},

author = {
Liu, Xuecheng
 and 
Xia, Shihong
 and 
Fan, Yiwen
 and 
Wang, Zhaoqi
},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.01852.x}

}
                
@article{
10.1111:j.1467-8659.2011.01854.x,

journal = {Computer Graphics Forum},
title = {{
Efficient Depth‐of‐Field Rendering with Adaptive Sampling and Multiscale Reconstruction}},

author = {
Chen, Jiating
 and 
Wang, Bin
 and 
Wang, Yuxiang
 and 
Overbeck, Ryan S.
 and 
Yong, Jun‐Hai
 and 
Wang, Wenping
},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.01854.x}

}
                
@article{
10.1111:j.1467-8659.2011.01897.x,

journal = {Computer Graphics Forum},
title = {{
Improved Model‐ and View‐Dependent Pruning of Large Botanical Scenes}},

author = {
Neubert, B.
 and 
Pirk, S.
 and 
Deussen, O.
 and 
Dachsbacher, C.
},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.01897.x}

}
                
@article{
10.1111:j.1467-8659.2011.01898.x,

journal = {Computer Graphics Forum},
title = {{
Visual Analysis of Large Graphs: State-of-the-Art and Future Research Challenges}},

author = {
Landesberger, T. von
 and 
Kuijper, A.
 and 
Schreck, T.
 and 
Kohlhammer, J.
 and 
Wijk, J.J. van
 and 
Fekete, J.‐D.
 and 
Fellner, Dieter W.
},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.01898.x}

}
                
@article{
10.1111:j.1467-8659.2011.01884.x,

journal = {Computer Graphics Forum},
title = {{
A Survey on Shape Correspondence}},

author = {
Kaick, Oliver van
 and 
Zhang, Hao
 and 
Hamarneh, Ghassan
 and 
Cohen‐Or, Daniel
},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.01884.x}

}
                
@article{
10.1111:j.1467-8659.2011.01899.x,

journal = {Computer Graphics Forum},
title = {{
Fast Mean‐Curvature Flow via Finite‐Elements Tracking}},

author = {
Chuang, Ming
 and 
Kazhdan, Michael
},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.01899.x}

}
                
@article{
10.1111:j.1467-8659.2011.01900.x,

journal = {Computer Graphics Forum},
title = {{
A Survey of Image Statistics Relevant to Computer Graphics}},

author = {
Pouli, Tania
 and 
Cunningham, Douglas W.
 and 
Reinhard, Erik
},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.01900.x}

}
                
@article{
10.1111:j.1467-8659.2011.01901.x,

journal = {Computer Graphics Forum},
title = {{
The State of the Art in Topology‐Based Visualization of Unsteady Flow}},

author = {
Pobitzer, Armin
 and 
Peikert, Ronald
 and 
Fuchs, Raphael
 and 
Schindler, Benjamin
 and 
Kuhn, Alexander
 and 
Theisel, Holger
 and 
Matković, Krešimir
 and 
Hauser, Helwig
},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.01901.x}

}
                
@article{
10.1111:j.1467-8659.2011.01902.x,

journal = {Computer Graphics Forum},
title = {{
Flexible and Accurate Transparent - Object Matting and Compositing Using Refractive Vector Field}},

author = {
Duan, Qi
 and 
Zheng, Jianmin
 and 
Cai, Jianfei
},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.01902.x}

}
                
@article{
10.1111:j.1467-8659.2011.01903.x,

journal = {Computer Graphics Forum},
title = {{
Extending Backward Polygon Beam Tracing to Glossy Scattering Surfaces}},

author = {
Duvenhage, B.
 and 
Bouatouch, K.
 and 
Kourie, D. G.
},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.01903.x}

}
                
@article{
10.1111:j.1467-8659.2011.01904.x,

journal = {Computer Graphics Forum},
title = {{
Diffusion‐Based Snow Cover Generation}},

author = {
Festenberg, Niels v.
 and 
Gumhold, Stefan
},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.01904.x}

}
                
@article{
10.1111:j.1467-8659.2011.01970.x,

journal = {Computer Graphics Forum},
title = {{
New EUROGRAPHICS Fellows}},

author = {},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.01970.x}

}
                
@article{
10.1111:j.1467-8659.2011.01973.x,

journal = {Computer Graphics Forum},
title = {{
Event report: Eurographics 2011 Workshop on 3D Object Retrieval (EG 3DOR'2011)}},

author = {},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.01973.x}

}
                
@article{
10.1111:j.1467-8659.2011.02069.x,

journal = {Computer Graphics Forum},
title = {{
Report of The Statutory Auditors to the General Meeting of The Members Of Eurographics Association Geneva}},

author = {},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.02069.x}

}
                
@article{
10.1111:j.1467-8659.2011.01966.x,

journal = {Computer Graphics Forum},
title = {{
A Linear Variational System for Modelling From Curves}},

author = {
Andrews, James
 and 
Joshi, Pushkar
 and 
Carr, Nathan
},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.01966.x}

}
                
@article{
10.1111:j.1467-8659.2011.01997.x,

journal = {Computer Graphics Forum},
title = {{
Event report: Symposium on Computer Animation 2010}},

author = {},
year = {
2011},

publisher = {
The Eurographics Association and Blackwell Publishing Ltd.},


ISSN = {1467-8659},

DOI = {
10.1111/j.1467-8659.2011.01997.x}

}

Browse

Recent Submissions

Now showing 1 - 20 of 20
  • No Thumbnail Available
    Item
    Adaptive Records for Irradiance Caching
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Ribardière, Mickaël; Carré, Samuel; Bouatouch, Kadi; Eduard Groeller and Holly Rushmeier
    Irradiance Caching is one of the most widely used algorithms to speed up global illumination. In this paper, we propose an algorithm based on the Irradiance Caching scheme that allows us (1) to adjust the density of cached records according to illumination changes and (2) to efficiently render the high‐frequency illumination changes. To achieve this, a new record footprint is presented. Although the original method uses records having circular footprints depending only on geometrical features, our record footprints have a more complex shape which accounts for both geometry and irradiance variations. Irradiance values are computed using a classical Monte Carlo ray tracing method that simplifies the determination of nearby objects and the pre‐computation of the shape of the influence zone of the current record. By gathering irradiance due to all the incident rays, illumination changes are evaluated to adjust the footprint’s records. As a consequence, the record footprints are smaller where illumination gradients are high. With this technique, the record density depends on the irradiance variations. Strong variations of irradiance (due to direct contributions for example) can be handled and evaluated accurately. Caching direct illumination is of high importance, especially in the case of scenes having many light sources with complex geometry as well as surfaces exposed to daylight. Recomputing direct illumination for the whole image can be very time‐consuming, especially for walkthrough animation rendering or for high‐resolution pictures. Storing such contributions in the irradiance cache seems to be an appropriate solution to accelerate the final rendering pass.
  • No Thumbnail Available
    Item
    Implicit Hierarchical Quad‐Dominant Meshes
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Panozzo, Daniele; Puppo, Enrico; Eduard Groeller and Holly Rushmeier
    We present a method for producing quad‐dominant subdivided meshes, which supports both adaptive refinement and adaptive coarsening. A hierarchical structure is stored implicitly in a standard half‐edge data structure, while allowing us to efficiently navigate through the different level of subdivision. Subdivided meshes contain a majority of quad elements and a moderate amount of triangles and pentagons in the regions of transition across different levels of detail. Topological LOD editing is controlled with local conforming operators, which support both mesh refinement and mesh coarsening. We show two possible applications of this method: we define an adaptive subdivision surface scheme that is topologically and geometrically consistent with the Catmull–Clark subdivision; and we present a remeshing method that produces semi‐regular adaptive meshes.
  • No Thumbnail Available
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    Scale Space Meshing of Raw Data Point Sets
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Digne, Julie; Morel, Jean‐Michel; Souzani, Charyar‐Mehdi; Lartigue, Claire; Eduard Groeller and Holly Rushmeier
    This paper develops a scale space strategy for orienting and meshing exactly and completely a raw point set. The scale space is based on the intrinsic heat equation, also called mean curvature motion (MCM). A simple iterative scheme implementing MCM directly on the raw point set is described, and a mathematical proof of its consistency with MCM is given. Points evolved by this MCM implementation can be trivially backtracked to their initial raw position. Therefore, both the orientation and mesh of the data point set obtained at a smooth scale can be transported back on the original. The gain in visual accuracy is demonstrated on archaeological objects by comparison with several state of the art meshing methods.
  • No Thumbnail Available
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    General Spectral Camera Lens Simulation
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Steinert, B.; Dammertz, H.; Hanika, J.; Lensch, H. P. A.; Eduard Groeller and Holly Rushmeier
    We present a camera lens simulation model capable of producing advanced photographic phenomena in a general spectral Monte Carlo image rendering system. Our approach incorporates insights from geometrical diffraction theory, from optical engineering and from glass science. We show how to efficiently simulate all five monochromatic aberrations, spherical and coma aberration, astigmatism, field curvature and distortion. We also consider chromatic aberration, lateral colour and aperture diffraction. The inclusion of Fresnel reflection generates correct lens flares and we present an optimized sampling method for path generation.
  • No Thumbnail Available
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    Exploring Non‐Linear Relationship of Blendshape Facial Animation
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Liu, Xuecheng; Xia, Shihong; Fan, Yiwen; Wang, Zhaoqi; Eduard Groeller and Holly Rushmeier
    Human face is a complex biomechanical system and non‐linearity is a remarkable feature of facial expressions. However, in blendshape animation, facial expression space is linearized by regarding linear relationship between blending weights and deformed face geometry. This results in the loss of reality in facial animation. To synthesize more realistic facial animation, aforementioned relationship should be non‐linear to allow the greatest generality and fidelity of facial expressions. Unfortunately, few existing works pay attention to the topic about how to measure the non‐linear relationship. In this paper, we propose an optimization scheme that automatically explores the non‐linear relationship of blendshape facial animation from captured facial expressions. Experiments show that the explored non‐linear relationship is consistent with the non‐linearity of facial expressions soundly and is able to synthesize more realistic facial animation than the linear one.
  • No Thumbnail Available
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    Efficient Depth‐of‐Field Rendering with Adaptive Sampling and Multiscale Reconstruction
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Chen, Jiating; Wang, Bin; Wang, Yuxiang; Overbeck, Ryan S.; Yong, Jun‐Hai; Wang, Wenping; Eduard Groeller and Holly Rushmeier
    Depth‐of‐field is one of the most crucial rendering effects for synthesizing photorealistic images. Unfortunately, this effect is also extremely costly. It can take hundreds to thousands of samples to achieve noise‐free results using Monte Carlo integration. This paper introduces an efficient adaptive depth‐of‐field rendering algorithm that achieves noise‐free results using significantly fewer samples. Our algorithm consists of two main phases: adaptive sampling and image reconstruction. In the adaptive sampling phase, the adaptive sample density is determined by a ‘blur‐size’ map and ‘pixel‐variance’ map computed in the initialization. In the image reconstruction phase, based on the blur‐size map, we use a novel multiscale reconstruction filter to dramatically reduce the noise in the defocused areas where the sampled radiance has high variance. Because of the efficiency of this new filter, only a few samples are required. With the combination of the adaptive sampler and the multiscale filter, our algorithm renders near‐reference quality depth‐of‐field images with significantly fewer samples than previous techniques.
  • No Thumbnail Available
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    Improved Model‐ and View‐Dependent Pruning of Large Botanical Scenes
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Neubert, B.; Pirk, S.; Deussen, O.; Dachsbacher, C.; Eduard Groeller and Holly Rushmeier
    We present an optimized pruning algorithm that allows for considerable geometry reduction in large botanical scenes while maintaining high and coherent rendering quality. We improve upon previous techniques by applying model‐specific geometry reduction functions and optimized scaling functions. For this we introduce the use of Precision and Recall (PR) as a measure of quality to rendering and show how PR‐scores can be used to predict better scaling values. We conducted a user‐study letting subjects adjust the scaling value, which shows that the predicted scaling matches the preferred ones. Finally, we extend the originally purely stochastic geometry prioritization for pruning to account for view‐optimized geometry selection, which allows to take global scene information, such as occlusion, into consideration. We demonstrate our method for the rendering of scenes with thousands of complex tree models in real‐time.
  • No Thumbnail Available
    Item
    Visual Analysis of Large Graphs: State-of-the-Art and Future Research Challenges
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Landesberger, T. von; Kuijper, A.; Schreck, T.; Kohlhammer, J.; Wijk, J.J. van; Fekete, J.‐D.; Fellner, Dieter W.; Eduard Groeller and Holly Rushmeier
    The analysis of large graphs plays a prominent role in various fields of research and is relevant in many important application areas. Effective visual analysis of graphs requires appropriate visual presentations in combination with respective user interaction facilities and algorithmic graph analysis methods. How to design appropriate graph analysis systems depends on many factors, including the type of graph describing the data, the analytical task at hand and the applicability of graph analysis methods. The most recent surveys of graph visualization and navigation techniques cover techniques that had been introduced until 2000 or concentrate only on graph layouts published until 2002. Recently, new techniques have been developed covering a broader range of graph types, such as time‐varying graphs. Also, in accordance with ever growing amounts of graph‐structured data becoming available, the inclusion of algorithmic graph analysis and interaction techniques becomes increasingly important. In this State‐of‐the‐Art Report, we survey available techniques for the visual analysis of large graphs. Our review first considers graph visualization techniques according to the type of graphs supported. The visualization techniques form the basis for the presentation of interaction approaches suitable for visual graph exploration. As an important component of visual graph analysis, we discuss various graph algorithmic aspects useful for the different stages of the visual graph analysis process. We also present main open research challenges in this field.
  • No Thumbnail Available
    Item
    A Survey on Shape Correspondence
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Kaick, Oliver van; Zhang, Hao; Hamarneh, Ghassan; Cohen‐Or, Daniel; Eduard Groeller and Holly Rushmeier
    We review methods designed to compute correspondences between geometric shapes represented by triangle meshes, contours or point sets. This survey is motivated in part by recent developments in space–time registration, where one seeks a correspondence between non‐rigid and time‐varying surfaces, and semantic shape analysis, which underlines a recent trend to incorporate shape understanding into the analysis pipeline. Establishing a meaningful correspondence between shapes is often difficult because it generally requires an understanding of the structure of the shapes at both the local and global levels, and sometimes the functionality of the shape parts as well. Despite its inherent complexity, shape correspondence is a recurrent problem and an essential component of numerous geometry processing applications. In this survey, we discuss the different forms of the correspondence problem and review the main solution methods, aided by several classification criteria arising from the problem definition. The main categories of classification are defined in terms of the input and output representation, objective function and solution approach. We conclude the survey by discussing open problems and future perspectives.
  • No Thumbnail Available
    Item
    Fast Mean‐Curvature Flow via Finite‐Elements Tracking
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Chuang, Ming; Kazhdan, Michael; Eduard Groeller and Holly Rushmeier
    In this paper, we present a novel approach for efficiently evolving meshes using mean‐curvature flow. We use a finite‐elements hierarchy that supports an efficient multigrid solver for performing the semi‐implicit time‐stepping. Although expensive to compute, we show that it is possible to track this hierarchy through the process of surface evolution. As a result, we provide a way to efficiently flow the surface through the evolution, without requiring a costly initialization at the beginning of each time‐step. Using our approach, we demonstrate a factor of nearly seven‐fold improvement over the non‐tracking implementation, supporting the evolution of surfaces consisting of 1M triangles at a rate of just a few seconds per update.
  • No Thumbnail Available
    Item
    A Survey of Image Statistics Relevant to Computer Graphics
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Pouli, Tania; Cunningham, Douglas W.; Reinhard, Erik; Eduard Groeller and Holly Rushmeier
    The statistics of natural images have attracted the attention of researchers in a variety of fields and have been used as a means to better understand the human visual system and its processes. A number of algorithms in computer graphics, vision and image processing take advantage of such statistical findings to create visually more plausible results. With this report we aim to review the state of the art in image statistics and discuss existing and potential applications within computer graphics and related areas.
  • No Thumbnail Available
    Item
    The State of the Art in Topology‐Based Visualization of Unsteady Flow
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Pobitzer, Armin; Peikert, Ronald; Fuchs, Raphael; Schindler, Benjamin; Kuhn, Alexander; Theisel, Holger; Matković, Krešimir; Hauser, Helwig; Eduard Groeller and Holly Rushmeier
    Vector fields are a common concept for the representation of many different kinds of flow phenomena in science and engineering. Methods based on vector field topology are known for their convenience for visualizing and analysing steady flows, but a counterpart for unsteady flows is still missing. However, a lot of good and relevant work aiming at such a solution is available. We give an overview of previous research leading towards topology‐based and topology‐inspired visualization of unsteady flow, pointing out the different approaches and methodologies involved as well as their relation to each other, taking classical (i.e. steady) vector field topology as our starting point. Particularly, we focus on Lagrangian methods, space–time domain approaches, local methods and stochastic and multifield approaches. Furthermore, we illustrate our review with practical examples for the different approaches.
  • No Thumbnail Available
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    Flexible and Accurate Transparent - Object Matting and Compositing Using Refractive Vector Field
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Duan, Qi; Zheng, Jianmin; Cai, Jianfei; Eduard Groeller and Holly Rushmeier
    In digital image editing, environment matting and compositing are fundamental and interesting operations that can capture and simulate the refraction and reflection effects of light from an environment. The state‐of‐the‐art real‐time environment matting and compositing method is short of flexibility, in the sense that it has to repeat the entire complex matte acquisition process if the distance between the object and the background is different from that in the acquisition stage, and also lacks accuracy, in the sense that it can only remove noises but not errors. In this paper, we introduce the concept of refractive vector and propose to use a refractive vector field as a new representation for environment matte. Such refractive vector field provides great flexibility for transparent‐object environment matting and compositing. Particularly, with only one process of the matte acquisition and the refractive vector field extraction, we are able to composite the transparent object into an arbitrary background at any distance. Furthermore, we introduce a piecewise vector field fitting algorithm to simultaneously remove both noises and errors contained in the extracted matte data. Experimental results show that our method is less sensitive to artefacts and can generate perceptually good composition results for more general scenarios.
  • No Thumbnail Available
    Item
    Extending Backward Polygon Beam Tracing to Glossy Scattering Surfaces
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Duvenhage, B.; Bouatouch, K.; Kourie, D. G.; Eduard Groeller and Holly Rushmeier
    Backward polygon beam tracing methods, that is beam tracing from the light source (L), are well suited to gather path coherency from specular (S) scattering surfaces. These methods are useful for modelling and efficiently simulating caustics on diffuse (D) surfaces; an effect due to LS+D transport paths. This paper generalizes backward polygon beam tracing to include a glossy (G) scattering surface. To this end the details of a beam tracing lumped model and implementation of L(S | G)D transport paths are presented. Although we limit the discussion to short transport paths, we show that backward beam tracing is faster than photon mapping by an order of magnitude for rendering caustics from glossy and specular surfaces.
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    Diffusion‐Based Snow Cover Generation
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Festenberg, Niels v.; Gumhold, Stefan; Eduard Groeller and Holly Rushmeier
    We present a method to generate snow covers on complex scene geometries. Both volumetric snow shapes and photorealistic texturing are computed. We formulate snow accumulation as a diffusive distribution process on a ground scene. Our theoretical framework is motivated by models for granular material deposition. With the framework we can capture the most relevant features of natural snow cover geometries in a concise local computation scheme. Snow bridges and overhangs are also included. Snow surface texture coordinates are computed to create realistic ground–snow interfaces. Several example scenes and a supplementary snow cover growth animation demonstrate the method's efficiency.
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    New EUROGRAPHICS Fellows
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Eduard Groeller and Holly Rushmeier
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    Event report: Eurographics 2011 Workshop on 3D Object Retrieval (EG 3DOR'2011)
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Eduard Groeller and Holly Rushmeier
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    Report of The Statutory Auditors to the General Meeting of The Members Of Eurographics Association Geneva
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Eduard Groeller and Holly Rushmeier
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    A Linear Variational System for Modelling From Curves
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Andrews, James; Joshi, Pushkar; Carr, Nathan; Eduard Groeller and Holly Rushmeier
    We present a linear system for modelling 3D surfaces from curves. Our system offers better performance, stability and precision in control than previous non‐linear systems. By exploring the direct relationship between a standard higher‐order Laplacian editing framework and Hermite spline curves, we introduce a new form of Cauchy constraint that makes our system easy to both implement and control. We introduce novel workflows that simplify the construction of 3D models from sketches. We show how to convert existing 3D meshes into our curve‐based representation for subsequent editing and modelling, allowing our technique to be applied to a wide range of existing 3D content.
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    Event report: Symposium on Computer Animation 2010
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Eduard Groeller and Holly Rushmeier