PG2014short

Permanent URI for this collection

https://diglib.eg.org/handle/10.2312/7750
Seoul, Korea, October 8th – 10th, 2014

BibTeX (PG2014short)
@inproceedings{
:10.2312/pgs.20141243,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Incorporating Fiber Controls into FEM Model for Transversely Isotropic Materials}},

author = {
Jianping, Cai
 and 
Feng, Lin
 and 
Tsui, Lee Yong
 and 
Kemao, Qian
 and 
Soon, Seah Hock
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141243}

}
@inproceedings{
:10.2312/pgs.20141244,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Scene Segmentation and Understanding for Context-Free Point Clouds}},

author = {
Spina, Sandro
 and 
Debattista, Kurt
 and 
Bugeja, Keith
 and 
Chalmers, Alan
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141244}

}
@inproceedings{
:10.2312/pgs.20141245,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Visibility Filtering for Producing Indirect Illumination}},

author = {
Chen, Yu-Jung
 and 
Yen, Chen-Yu
 and 
Chen, Yen-Yu
 and 
Chen, Wei-Chao
 and 
Chien, Shao-Yi
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141245}

}
@inproceedings{
:10.2312/pgs.20141246,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Integrating Occlusion Culling into LOD on GPU}},

author = {
Peng, Chao
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141246}

}
@inproceedings{
:10.2312/pgs.20141247,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Surface Mesh Segmentation and Reconstruction with Smooth Boundary Curves}},

author = {
Tsuchie, Shoichi
 and 
Higashi, Masatake
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141247}

}
@inproceedings{
:10.2312/pgs.20141248,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Projecting Points onto Planar Parametric Curves by Local Biarc Approximation}},

author = {
Song, Hai-Chuan
 and 
Shi, Kan-Le
 and 
Yong, Jun-Hai
 and 
Zhang, Sen
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141248}

}
@inproceedings{
:10.2312/pgs.20141249,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Real-time Collision Detection with Two-level Spatial Hashing on GPU}},

author = {
Hong, Yang
 and 
Wu, Wen
 and 
Chen, Hui
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141249}

}
@inproceedings{
:10.2312/pgs.20141250,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Automatic Garment Modeling From Front And Back Images}},

author = {
Huang, Lifeng
 and 
Gao, Chengying
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141250}

}
@inproceedings{
:10.2312/pgs.20141252,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Image Palette: Brushstroke Synthesis-based Style Transfer}},

author = {
Miao, Zheng
 and 
Zhang, Yan
 and 
Zheng, Zhibin
 and 
Sun, Zhengxing
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141252}

}
@inproceedings{
:10.2312/pgs.20141251,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Random Sparse Coded Aperture for Lensless Imaging}},

author = {
Wang, Zhenglin
 and 
Lee, Ivan
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141251}

}
@inproceedings{
:10.2312/pgs.20141256,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Automatic Aesthetics-based Lighting Design with Global Illumination}},

author = {
Léon, Vincent
 and 
Gruson, Adrien
 and 
Cozot, Rémi
 and 
Bouatouch, Kadi
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141256}

}
@inproceedings{
:10.2312/pgs.20141255,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Finding Feature Similarities Between Geometric Trees}},

author = {
Mukherjee, Uddipan
 and 
Gopi, Meenakshisundaram
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141255}

}
@inproceedings{
:10.2312/pgs.20141253,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Album Quickview in Comic-like Layout via Quartet Analysis}},

author = {
Zheng, Zhibin
 and 
Zhang, Yan
 and 
Miao, Zheng
 and 
Sun, Zhengxing
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141253}

}
@inproceedings{
:10.2312/pgs.20141254,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Data-Driven Fire Synthesis and Design}},

author = {
Wong, Sai-Keung
 and 
Chang, Tse-Ching
 and 
Ho, Tan-Chi
 and 
Chuang, Jung-Hong
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141254}

}
@inproceedings{
:10.2312/pgs.20141257,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Quantitative Analysis of Voxel Raytracing Acceleration Structures}},

author = {
Chajdas, Matthäus G.
 and 
Westermann, Rüdiger
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141257}

}
@inproceedings{
:10.2312/pgs.20141258,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Saliency-driven Depth Compression for 3D Image Warping}},

author = {
Gu, Minjie
 and 
Hu, Shanfeng
 and 
Wang, Xiaochuan
 and 
Liang, Xiaohui
 and 
Shen, Xukun
 and 
Qin, Aihong
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141258}

}
@inproceedings{
:10.2312/pgs.20141259,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Geometry-Aware Image Completion via Multiple Examples}},

author = {
Wang, Guihang
 and 
Chen, Xuejin
 and 
Hu, Siyu
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141259}

}
@inproceedings{
:10.2312/pgs.20141260,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Example-based Haze Removal with two-layer Gaussian Process Regressions}},

author = {
Fan, Xin
 and 
Gao, Renjie
 and 
Wang, Yi
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141260}

}
@inproceedings{
:10.2312/pgs.20141262,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Extraction and Transfer of Facial Expression Wrinkles for Facial Performance Enhancement}},

author = {
Shin, Il-Kyu
 and 
Öztireli, A. Cengiz
 and 
Kim, Hyeon-Joong
 and 
Beeler, Thabo
 and 
Gross, Markus
 and 
Choi, Soo-Mi
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141262}

}
@inproceedings{
:10.2312/pgs.20141261,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
PatchMove: Patch-based Fast Image Interpolation with Greedy Bidirectional Correspondence}},

author = {
Saito, Shunsuke
 and 
Sakamoto, Ryuuki
 and 
Morishima, Shigeo
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141261}

}
@inproceedings{
:10.2312/pgs.20141263,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Visual Analysis of FPS Gameplay Data: From Game Design to Player Behavior}},

author = {
Li, Quan
 and 
Qu, Huamin
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141263}

}
@inproceedings{
:10.2312/pgs.20141264,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Automatic 3D Posing from 2D Hand-Drawn Sketches}},

author = {
Gouvatsos, Alexandros
 and 
Xiao, Zhidong
 and 
Marsden, Neil
 and 
Zhang, Jian J.
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141264}

}
@inproceedings{
:10.2312/pgs.20141265,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Parallel BTF Compression with Multi-Level Vector Quantization in OpenCL}},

author = {
Egert, Petr
 and 
Vlastimil, Havran
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141265}

}
@inproceedings{
:10.2312/pgs.20141268,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Perceptually Optimised Illumination for Seamless Composites}},

author = {
Chalmers, Andrew
 and 
Choi, Jong Jin
 and 
Rhee, Taehyun
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141268}

}
@inproceedings{
:10.2312/pgs.20141267,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
A Simple Artistic Rendering Method for Stereoscopic Images}},

author = {
Li, Dajin
 and 
Bai, Chengjie
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141267}

}
@inproceedings{
:10.2312/pgs.20141266,

booktitle = {
Pacific Graphics Short Papers},

editor = {
John Keyser and Young J. Kim and Peter Wonka
},
title = {{
Sky Browser: Search for HDR Sky Maps}},

author = {
Chalmers, Andrew
 and 
Lewis, John
 and 
Hillman, Peter
 and 
Tait, Charlie
 and 
Rhee, Taehyun
},
year = {
2014},

publisher = {
The Eurographics Association},


ISBN = {978-3-905674-73-6},

DOI = {
/10.2312/pgs.20141266}

}

Browse

Recent Submissions

Now showing 1 - 26 of 26
  • Thumbnail Image
    Item
    Incorporating Fiber Controls into FEM Model for Transversely Isotropic Materials
    (The Eurographics Association, 2014) Jianping, Cai; Feng, Lin; Tsui, Lee Yong; Kemao, Qian; Soon, Seah Hock; John Keyser and Young J. Kim and Peter Wonka
    Physically plausible deformable models based on continuum mechanics have been a hot topic in computer graphics for decades, and many models have been proposed to improve performance speed and stability. However, most of the existing models focus on isotropic materials, while elastic objects with complex anisotropic properties are less studied. Based on the observation that a large group of objects have specific internal structures (fibers) that determine their anisotropic behavior, we propose a fiber incorporated corotational FEM model that can approximate longitudinally anisotropic deformation. First, a fiber orientation field is used to establish local frames for each element; then, the orientation information is combined into the FEM model by adding local transformations on element stiffness matrices. This proposed model can provide a control for directable deformations, and yields realistic anisotropic deformations. Large deformations can be accommodated; meanwhile, with pre-computation it adds no computational cost to the existing corotational FEM model during simulation. Convincing experimental results and analytical comparisons are presented, together with an accompanying video demonstration.
  • Thumbnail Image
    Item
    Scene Segmentation and Understanding for Context-Free Point Clouds
    (The Eurographics Association, 2014) Spina, Sandro; Debattista, Kurt; Bugeja, Keith; Chalmers, Alan; John Keyser and Young J. Kim and Peter Wonka
    The continuous development of new commodity hardware intended to capture the surface structure of objects is quickly making point cloud data ubiquitous. Scene understanding methods address the problem of determining the objects present in a point cloud which, dependant on sensor capabilities and object occlusions, is normally noisy and incomplete. In this paper, we propose a novel technique which enables automatic identification of semantically meaningful structures within point clouds acquired using different sensors on a variety of scenes. The representation model, namely the structure graph, with nodes representing planar surface segments, is computed over these point clouds to help with the identification task. In order to accommodate for more complex objects (e.g. chair, couch, cabinet, table), a training process is used to determine and concisely describe, within each object's structure graph, its important shape characteristics. Results on a variety of point clouds show how our method can quickly discern certain object types.
  • Thumbnail Image
    Item
    Visibility Filtering for Producing Indirect Illumination
    (The Eurographics Association, 2014) Chen, Yu-Jung; Yen, Chen-Yu; Chen, Yen-Yu; Chen, Wei-Chao; Chien, Shao-Yi; John Keyser and Young J. Kim and Peter Wonka
    Indirect illumination is one of the most visually significant effects for a synthesized image. In order to render such effects at interactive rates, it is important to resolve the visibility between surfaces efficiently. In this work, we propose to approximate visibility by representing the scene through point proxies and hash them into voxels. The indirect illumination is then rendered in two stages. First, we cast sparse shadow rays to march and collect visible voxels for each low-resolution deferred pixel. The list of visible voxels are then processed using the proposed Visibility Filter (VF) to collect voxels missed from the first stage. Afterward, we properly weight the visible voxels as light sources to produce the full resolution image. Our method runs at interactive rates at 1.3 fps to 2.3 fps on GPUs with pleasing visual quality, in particular for glossy reflections.
  • Thumbnail Image
    Item
    Integrating Occlusion Culling into LOD on GPU
    (The Eurographics Association, 2014) Peng, Chao; John Keyser and Young J. Kim and Peter Wonka
    Real-time rendering of complex 3D models is still a very challenging task. Recently, GPU-based level-of-detail (LOD) approaches have been proposed to fast decrease the complexity of a 3D model, but applying only LOD approaches is usually not sufficient to achieve highly interactive rendering rate for the complex model that contains hundreds of millions of triangles. Visibility culling, especially occlusion culling, needs to be introduced to further reduce the amount of triangles being rendered at each frame. In this paper, we present a novel rendering approach that seamlessly integrates occlusion culling with the LOD approach in a unified scheme towards the GPU architecture. The result shows that the integration significantly reduces the complexity of the 3D model and satisfies the demands of both memory efficiency and performance.
  • Thumbnail Image
    Item
    Surface Mesh Segmentation and Reconstruction with Smooth Boundary Curves
    (The Eurographics Association, 2014) Tsuchie, Shoichi; Higashi, Masatake; John Keyser and Young J. Kim and Peter Wonka
    In mesh segmentation for industrial design objects, each segment defined by a region with closed boundary should correspond to its underlying surface constructed according to the designer's intention. In order to generate those segments from the scanned data, we propose a method in which (i) more suitable regions are extracted by the region splitting/merging processing with a new splitting scheme from the obtained clusters, (ii) smooth and consistent boundaries are generated as intersection or contacting curves between the adjacent underlying surfaces, and (iii) the region is reconstructed with high-quality triangle facets. We demonstrate the effectiveness of our method by applying it to the scanned data of the real-world industrial design objects.
  • Thumbnail Image
    Item
    Projecting Points onto Planar Parametric Curves by Local Biarc Approximation
    (The Eurographics Association, 2014) Song, Hai-Chuan; Shi, Kan-Le; Yong, Jun-Hai; Zhang, Sen; John Keyser and Young J. Kim and Peter Wonka
    This paper proposes a geometric iteration algorithm for computing point projection and inversion on surfaces based on local biarc approximation. The iteration begins with initial estimation of the projection of the prescribed test point. For each iteration, we construct a 3D biarc on the original surface to locally approximate the original surface starting from the current projection point. Then we compute the projection point for the next iteration, as well as the parameter corresponding to it, by projecting the test point onto this biarc. The iterative process terminates when the projection point satisfies the required precision. Examples demonstrate that our algorithm converges faster and is less dependent on the choice of the initial value compared to the traditional geometric iteration algorithms based on single-point approximation.
  • Thumbnail Image
    Item
    Real-time Collision Detection with Two-level Spatial Hashing on GPU
    (The Eurographics Association, 2014) Hong, Yang; Wu, Wen; Chen, Hui; John Keyser and Young J. Kim and Peter Wonka
    In this paper, a two-level parallel spatial hashing method is presented for real-time collision detection of deformable objects based on modern GPU architecture. The second-level of spatial hashing is used to improve the culling efficiency. Moreover, a novel encoding method on GPU is proposed to compensate the inflexibility of the GPU memory system. It can efficiently determine the colliding pairs of primitives between deformable objects. The experimental results show that our method can perform high culling efficiency with low memory cost.
  • Thumbnail Image
    Item
    Automatic Garment Modeling From Front And Back Images
    (The Eurographics Association, 2014) Huang, Lifeng; Gao, Chengying; John Keyser and Young J. Kim and Peter Wonka
    We present a system which can automatically generate a realistic garment model from two images of an existing garment. Without the requirement of tailoring expertise and tedious operation, our method takes the front and back images of a real garment as input, and the system will make reasonable geometric modeling as well as physical simulation of the garment. Combining with mannequin's skeleton information, we propose a panel positioning method to place garment panels in appropriate positions. A key feature of our system is to automatically interpret sewn information, which effectively simplifies user interaction. In addition, panel deformation method based on mannequin's pose allows easy data capture. It extends the flexibility and utility of our method. The experiments demonstrate the effectiveness on generating models of various garment styles.
  • Thumbnail Image
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    Image Palette: Brushstroke Synthesis-based Style Transfer
    (The Eurographics Association, 2014) Miao, Zheng; Zhang, Yan; Zheng, Zhibin; Sun, Zhengxing; John Keyser and Young J. Kim and Peter Wonka
    Painting style transfer is one kind technology where given the sample images with some specific art style, we can render the target images in the same style as the samples after some computation. In this paper we present a new approach of painting style transfer in which such a style transfer work is done by analogy with simulating the process of creation. We take the sample as palette where users can select arbitrary outlines or textures as the current input mode brush strokes. We then analyze brush strokes' style feature information and use such information for the style transfer and synthesis along the stroke curves learned from the specified area in target images to get the same painting style as the samples. The results show that the users can get a style-transferred personalized target image just by the given sample images and least interactions.
  • Thumbnail Image
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    Random Sparse Coded Aperture for Lensless Imaging
    (The Eurographics Association, 2014) Wang, Zhenglin; Lee, Ivan; John Keyser and Young J. Kim and Peter Wonka
    This paper develops a computational lensless imaging system based on a random sparse coded aperture. The camera consists of a thin mask with a coded pattern and a standard sensor array. The proposed coded aperture contains multiple square pinholes, and forms a superposition of multiple pinhole images. In order to reduce the artefact due to diffraction or interference and simultaneously to facilitate the fabrication, the pinholes are designed bigger than some other proposed ones, and sparsely spread on the mask. Only the diffraction pattern for one pinhole imaging model needs be taken into account to improve the angular resolution. An arising issue is that the resulting optical transfer function (OTF) involves many zero-value spectrums, which adversely affects the reconstruction quality with conventional image decoding techniques. We introduce a reselection scheme, which selects partial Fourier samples to reduce the impact of zero entries in OTF. Then, the total variation minimization with quadratic constraints algorithm is applied to attain a good quality reconstruction
  • Thumbnail Image
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    Automatic Aesthetics-based Lighting Design with Global Illumination
    (The Eurographics Association, 2014) Léon, Vincent; Gruson, Adrien; Cozot, Rémi; Bouatouch, Kadi; John Keyser and Young J. Kim and Peter Wonka
    In computer graphics, lighting plays an important role in the appearance of a scene. A change in the configuration of light sources can lead to different aesthetics in the final rendered image. Lighting design becomes increasingly complex when using sophisticated global illumination techniques. In this paper, we present a new approach to automatically design the lighting configuration according to the aesthetic goal specified by the user as a set of target parameters. Target parameters are used to set up an objective function which is minimized using an optimization method. The results show that our method can be used to automatically design a lighting configuration that will give to the final image a classic photographic look.
  • Thumbnail Image
    Item
    Finding Feature Similarities Between Geometric Trees
    (The Eurographics Association, 2014) Mukherjee, Uddipan; Gopi, Meenakshisundaram; John Keyser and Young J. Kim and Peter Wonka
    Geometric trees are graphs with no cycles in which the nodes have spatial co-ordinates and the edges are geometric curves. Many physical systems can be represented effectively using geometric trees, e.g. river beds, animal neurons, respiratory tracks of mammals etc. As these systems undergo structural metamorphosis, temporally or under the effect of some external stimulus, the underlying tree structures also change. Given two snapshots of structurally morphed trees, an algorithm for comparing them based on geometric and topological tree features is presented. Such comparison provides a wealth of information for interpreting the metamorphosis.
  • Thumbnail Image
    Item
    Album Quickview in Comic-like Layout via Quartet Analysis
    (The Eurographics Association, 2014) Zheng, Zhibin; Zhang, Yan; Miao, Zheng; Sun, Zhengxing; John Keyser and Young J. Kim and Peter Wonka
    For clear summary and efficient search of images for album, which carries a story of life record, we propose a new approach for quickview of album in comic-like layout via quartet analysis. How to organize the images in album and in what way to display images in collage are two key problems for album quickview. For the first problem, we take the idea of model organization method based on quartet analysis to construct categorization tree to organize the images; while for the second problem, we utilize the topological structure of categorization tree to decompose it into multiple groups of images and extract representative image from each group for subsequent collage. For the collage part, we choose comic-like layout to present collage because comic provides a concise way for storytelling and it has variablitiy in layout styles, which is suitable for album summary. Experiments demonstrate that our method could organize the images effectively and present images in collage with diverse styles as well.
  • Thumbnail Image
    Item
    Data-Driven Fire Synthesis and Design
    (The Eurographics Association, 2014) Wong, Sai-Keung; Chang, Tse-Ching; Ho, Tan-Chi; Chuang, Jung-Hong; John Keyser and Young J. Kim and Peter Wonka
    We present a data-driven synthesis approach to design and animate fires in desired shapes and motions. At the preprocessing stage, our system simulates a set of basis fires under specific simulation configurations and stores these basis fires as pathlines in a database. At the design stage, a user sketches a sequence of curves to design the desired shapes of target fires. Then, we compute a subset of basis fires to fit the curves. After that the target fires are synthesized by combining the basis fires. As our method generates target fires along the user sketched curves, our approach enables users to design the fire shapes in an intuitive manner. Experimental results show that our approach can synthesize fires in desired shapes and motions.
  • Thumbnail Image
    Item
    Quantitative Analysis of Voxel Raytracing Acceleration Structures
    (The Eurographics Association, 2014) Chajdas, Matthäus G.; Westermann, Rüdiger; John Keyser and Young J. Kim and Peter Wonka
    In this work, we provide a comprehensive analysis of GPU acceleration structures for voxel raytracing. We compare the commonly used octrees to BVH and KD trees, which are the standard in GPU triangle raytracing. Evaluating and analyzing of the behavior is complicated, as modern GPUs provide wide vector units with complex cache hierarchies. Even with sophisticated SIMD simulators, it is increasingly hard to model the hardware with sufficient detail to explain the observed performance. Therefore, instead of relying on SIMD simulation, we use hardware counters to directly measure key metrics like execution coherency on a modern GPU. We provide an extensive analysis comparing different acceleration structures for different raytracing scenarios like primary, diffuse and ambient occlusion rays. For different scenes we show that data structures commonly known for good performance, like KD-trees, are actually not suited for very wide SIMD units. In our work we show that BVH trees are most suitable for GPU raytracing and explain how the acceleration structure affects the execution coherency and ultimately performance, providing crucial information for the future design of GPU acceleration structures.
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    Saliency-driven Depth Compression for 3D Image Warping
    (The Eurographics Association, 2014) Gu, Minjie; Hu, Shanfeng; Wang, Xiaochuan; Liang, Xiaohui; Shen, Xukun; Qin, Aihong; John Keyser and Young J. Kim and Peter Wonka
    Current compression methods compress depth images by incorporating 2D features, which leads to a loss of the detail of the original 3D object in the recovered depth image. The main idea of this paper is to augment 2D features with 3D geometric information to preserve important regions of the depth image. Mesh saliency is used to represent the important regions of the 3D objects, and discontinuity edges are extracted to indicate the important regions of the depth image. We use mesh saliency to guide the adaptive random sampling to generate a random pixel sample of the depth image and then, combine this sample with the depth discontinuity edge to build the sparse depth representation. During the depth reconstruction, the depth image is recovered by using an up- and down-sampling schema with Gaussian bilateral filtering. The effectiveness of the proposed method is validated through 3D image warping applications. The visual and quantitative results show a significant improvement of the synthetic image quality compared with state-of-the-art depth compression methods.
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    Geometry-Aware Image Completion via Multiple Examples
    (The Eurographics Association, 2014) Wang, Guihang; Chen, Xuejin; Hu, Siyu; John Keyser and Young J. Kim and Peter Wonka
    When browsing through photographs taken during a trip, it can be a distressing discovery to find many other bystanders captured within the frame. A visually compelling snapshot preserves the desired subject in the foreground, and eliminates irrelevant persons or objects. In this paper, we present a new image completion algorithm that retains the geometric consistency of the scene using Internet photo collections. Our key insight allows us to successfully fill the missing regions with content derived from related images with distinct features, or from visible parts of the input image with repetitive textures. The final composition for the missing regions is guided by a confidence map combining the two types of example images. We validate our algorithm on a variety of scenes which are challenging for state-of-the-art completion techniques. The completion results successfully preserve the geometry consistency for complex structures in a wide range of depths.
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    Example-based Haze Removal with two-layer Gaussian Process Regressions
    (The Eurographics Association, 2014) Fan, Xin; Gao, Renjie; Wang, Yi; John Keyser and Young J. Kim and Peter Wonka
    Hazy images suffer from low visibility and contrast. Researchers have devoted great efforts to haze removal with the prior assumptions on observations in the past decade. However, these priors from observations can provide limited information for the restoration of high quality, and the assumptions are not always true for generic images in practice. On the other hand, visual data are increasing as the popularity of imaging devices. In this paper, we present a learning framework for haze removal based on two-layer Gaussian Process Regressions (GPR). By using training examples, the two-layer GPRs establish direct relationships from the input image to the depth-dependent transmission, and meanwhile learn local image priors to further improve the estimation. We also provide a method to collect training pairs for images of natural scenes. Both qualitative and quantitative comparisons on simulated and real-world hazy images demonstrate the effectiveness of the approach, especially when white or bright objects and heavy haze regions appear and existing dehazing methods may fail.
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    Extraction and Transfer of Facial Expression Wrinkles for Facial Performance Enhancement
    (The Eurographics Association, 2014) Shin, Il-Kyu; Öztireli, A. Cengiz; Kim, Hyeon-Joong; Beeler, Thabo; Gross, Markus; Choi, Soo-Mi; John Keyser and Young J. Kim and Peter Wonka
    Creating realistic models and animations of human faces with adequate level of detail is very challenging due to the high complexity of facial deformations and the sensitivity of the human visual system to human faces. One way to overcome this challenge is using face scans captured from real facial performances. However, capturing the required level of detail is only possible with high-end systems in controlled environments. Hence, a large body of work is devoted to enhancing already captured or modeled low resolution faces with details extracted from high fidelity facial scans. Details due to expression wrinkles are of particular importance for realistic facial animations. In this paper, we propose a new method to extract and transfer expression wrinkles from a high resolution example face model to a target model for enhancing the realism of facial animations. We define multi-scale maps that capture the essential details due to expression wrinkles on given example face models, and use these maps to transfer the details to a target face. The maps are interpolated in time to generate enhanced facial animations. We carefully design the detail maps such that transfer and interpolation can be performed very efficiently using linear methods.
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    PatchMove: Patch-based Fast Image Interpolation with Greedy Bidirectional Correspondence
    (The Eurographics Association, 2014) Saito, Shunsuke; Sakamoto, Ryuuki; Morishima, Shigeo; John Keyser and Young J. Kim and Peter Wonka
    In this paper, we present a method for the plausible interpolation of images. This method has several applications, such as for smooth view interpolation, low frame-rate video upsampling, and animation. The central idea is to quickly form dense correspondences using a patch-based nearest-neighbor search method called PatchMatch. However, the conventional PatchMatch method does not always find an accurate correspondence. This means that some patches do not find appropriate counterparts. Our method employs a greedy algorithm and an occlusion handling technique to correct inaccurate correspondences. Furthermore, our texture reconstruction method successfully reduces blurring effects. We demonstrate that our method significantly reduces the computation time required for interpolation, and show that the quality of reconstructed images is almost identical to that of those generated using state-of-the-art methods.
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    Visual Analysis of FPS Gameplay Data: From Game Design to Player Behavior
    (The Eurographics Association, 2014) Li, Quan; Qu, Huamin; John Keyser and Young J. Kim and Peter Wonka
    Gameplay data analysis has already become an important method for analyzing player behavior in games. Visualization is a promising way to explore and gain insight into the data. In this paper, we work closely with the game designers and user experience engineers to develop a visual analytic system to help them explore the gameplay data for a novel FPS (First-Person Shooter) game specific in the mainland China. We first come up with task specifications for such a system. After that, we propose a set of design goals for our system. VisFPS, is thus developed iteratively through a complete use-centered design process. The system is divided into two parts: Macro-View to deal with the overall gameplay data to discover patterns, and Micro-View to focus on a specific game match to recreate the game scene and use it to study player behavior and verify the game design intent.
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    Automatic 3D Posing from 2D Hand-Drawn Sketches
    (The Eurographics Association, 2014) Gouvatsos, Alexandros; Xiao, Zhidong; Marsden, Neil; Zhang, Jian J.; John Keyser and Young J. Kim and Peter Wonka
    Inferring the 3D pose of a character from a drawing is a non-trivial and under-constrained problem. Solving it may help automate various parts of an animation production pipeline such as pre-visualisation. In this paper, a novel way of inferring the 3D pose from a monocular 2D sketch is proposed. The proposed method does not make any external assumptions about the model, allowing it to be used on different types of characters. The 3D pose inference is formulated as an optimisation problem and a parallel variation of the Particle Swarm Optimisation algorithm called PARAC-LOAPSO is utilised for searching the minimum. Testing in isolation as well as part of a larger scene, the presented method is evaluated by posing a lamp and a horse character. The results show that this method is robust and is able to be extended to various types of models.
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    Parallel BTF Compression with Multi-Level Vector Quantization in OpenCL
    (The Eurographics Association, 2014) Egert, Petr; Vlastimil, Havran; John Keyser and Young J. Kim and Peter Wonka
    Bidirectional Texture Function (BTF) as an effective visual fidelity representation of surface appearance is becoming more and more widely used. In this paper we report on contributions to BTF data compression for multi-level vector quantization. We describe novel decompositions that improve the compression ratio by 15% in comparison with the original method, without loss of visual quality. Further, we show how for offline storage the compression ratio can be increased by 33% in total by Huffman coding. We also show that efficient parallelization of the vector quantization algorithm in OpenCL can reduce the compression time by factor of 9 on a GPU. The results for the new compression algorithm are shown on six low dynamic range BTFs and four high dynamic range publicly available BTF samples. Our method allows for real time synthesis on a GPU.
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    Perceptually Optimised Illumination for Seamless Composites
    (The Eurographics Association, 2014) Chalmers, Andrew; Choi, Jong Jin; Rhee, Taehyun; John Keyser and Young J. Kim and Peter Wonka
    Realistic illumination in composition is important for a seamless mixture between the virtual and real world objects in visual effects and mixed reality. The seamlessness is the measure of how perceivably apparent the synthetic object in the final composition is, and how indistinguishable it is from the photographed scene. Given that the ultimate receiver of image information is the human eye, the metric is determined by the Human Visual System (HVS). We conducted a series of psychophysical studies to observe and capture the thresholds of the HVS's ability to perceive illumination inconsistencies between the rendered subject and the photographed scene. Based on our observations, we find perceptually optimised thresholds for reducing resources across resolution and dynamic range of the radiance map (RM) for image based lighting (IBL). We evaluated our thresholds to illuminate virtual objects for seamless composition with photographed scenes.
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    A Simple Artistic Rendering Method for Stereoscopic Images
    (The Eurographics Association, 2014) Li, Dajin; Bai, Chengjie; John Keyser and Young J. Kim and Peter Wonka
    General painterly rendering algorithms cannot be used to render stereo image pair separately because they may produce random noise and lead to inconsistency between binocular images. In this paper, a generic rendering framework of artistic stereoscopic images for virtual 3D scenes is presented. Firstly, an artistic image that contains entire visible surfaces of a 3D model from two eyes was rendered. During the projection transformation, the texture coordinates which correspond to vertices of the model were recorded. Then, the artistic image is mapped to object surface so as to obtain the stylized model. Finally, the stylized 3D model is projected to the left and right cameras for artistic stereoscopic images. The proposed rendering framework can guarantee the consistency between binocular images; moreover, it also can be applied to various existing artistic rendering algorithms.
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    Sky Browser: Search for HDR Sky Maps
    (The Eurographics Association, 2014) Chalmers, Andrew; Lewis, John; Hillman, Peter; Tait, Charlie; Rhee, Taehyun; John Keyser and Young J. Kim and Peter Wonka
    In a visual effects studio for movie production, sky maps play an important role for acting as a sky backdrop to a scene. The backdrop to a scene is often represented using a high-resolution sky map. This motivates the need for a large collection of sky maps to match various moods and lighting conditions. A comprehensive collection of images is not useful however, without a method of searching for desired images within that database. In this paper we define a feature space that supports an interactive search function for HDR sky maps, allowing users to find ideal images based on its appearance. The set of features are automatically extracted from the sky maps in an offline pre-processing step, and are queried in real time for progressive browsing. The system uses unsupervised learning techniques, discarding the need for labelling a large set of existing sky maps.