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Displaying 1-50 out of 60 total
Structure-based ASCII art
Found in: ACM Transactions on Graphics (TOG)
By Linling Zhang, Tien-Tsin Wong, Xuemiao Xu, Linling Zhang, Tien-Tsin Wong, Xuemiao Xu, Linling Zhang, Tien-Tsin Wong, Xuemiao Xu, Linling Zhang, Tien-Tsin Wong, Xuemiao Xu
Issue Date:July 2010
pp. 1-10
The wide availability and popularity of text-based communication channels encourage the usage of ASCII art in representing images. Existing tone-based ASCII art generation methods lead to halftone-like results and require high text resolution for display, ...
     
Camouflage images
Found in: ACM Transactions on Graphics (TOG)
By Daniel Cohen-Or, Hung-Kuo Chu, Niloy J. Mitra, Tien-Tsin Wong, Tong-Yee Lee, Wei-Hsin Hsu, Daniel Cohen-Or, Hung-Kuo Chu, Niloy J. Mitra, Tien-Tsin Wong, Tong-Yee Lee, Wei-Hsin Hsu, Daniel Cohen-Or, Hung-Kuo Chu, Niloy J. Mitra, Tien-Tsin Wong, Tong-Yee Lee, Wei-Hsin Hsu, Daniel Cohen-Or, Hung-Kuo Chu, Niloy J. Mitra, Tien-Tsin Wong, Tong-Yee Lee, Wei-Hsin Hsu
Issue Date:July 2010
pp. 1-10
Camouflage images contain one or more hidden figures that remain imperceptible or unnoticed for a while. In one possible explanation, the ability to delay the perception of the hidden figures is attributed to the theory that human perception works in two m...
     
Estimating Light Vectors in Real Time
Found in: IEEE Computer Graphics and Applications
By Wai-Man Pang, Tien-Tsin Wong, Pheng-Ann Heng
Issue Date:May 2004
pp. 36-43
The determination of the light vector is important for capturing the surface appearance under different illumination conditions. This is necessary for bi-directional reflectance distribution function measurement, texture acquisition, and image-based data a...
 
Statistical Invariance for Texture Synthesis
Found in: IEEE Transactions on Visualization and Computer Graphics
By Xiaopei Liu, Lei Jiang, Tien-Tsin Wong, Chi-Wing Fu
Issue Date:November 2012
pp. 1836-1848
Estimating illumination and deformation fields on textures is essential for both analysis and application purposes. Traditional methods for such estimation usually require complicated and sometimes labor-intensive processing. In this paper, we propose a ne...
 
Evolutionary Computing on Consumer Graphics Hardware
Found in: IEEE Intelligent Systems
By Ka-Ling Fok, Tien-Tsin Wong, Man-Leung Wong
Issue Date:March 2007
pp. 69-78
Evolutionary algorithms are effective, robust methods for solving many practical problems such as feature selection, electrical-circuit synthesis, and data mining. However, they can take a long time on some difficult problems because they need to perform s...
 
Spatiotemporal Sampling of Dynamic Environment Sequences
Found in: IEEE Transactions on Visualization and Computer Graphics
By Liang Wan,Shue-Kwan Mak,Tien-Tsin Wong,Chi-Sing Leung
Issue Date:October 2011
pp. 1499-1509
Environment sampling is a popular technique for rendering scenes with distant environment illumination. However, the temporal consistency of animations synthesized under dynamic environment sequences has not been fully studied. This paper addresses this pr...
 
Motion Imitation with a Handheld Camera
Found in: IEEE Transactions on Visualization and Computer Graphics
By Guofeng Zhang,Hanqing Jiang,Jin Huang,Jiaya Jia,Tien-Tsin Wong,Kun Zhou,Hujun Bao
Issue Date:October 2011
pp. 1475-1486
In this paper, we present a novel method to extract motion of a dynamic object from a video that is captured by a handheld camera, and apply it to a 3D character. Unlike the motion capture techniques, neither special sensors/trackers nor a controllable env...
 
Unicube for Dynamic Environment Mapping
Found in: IEEE Transactions on Visualization and Computer Graphics
By Tze-Yiu Ho, Liang Wan, Chi-Sing Leung, Ping-Man Lam, Tien-Tsin Wong
Issue Date:January 2011
pp. 51-63
Cube mapping is widely used in many graphics applications due to the availability of hardware support. However, it does not sample the spherical surface evenly. Recently, a uniform spherical mapping, isocube mapping, was proposed. It exploits the six-face ...
 
Evolving Mazes from Images
Found in: IEEE Transactions on Visualization and Computer Graphics
By Liang Wan, Xiaopei Liu, Tien-Tsin Wong, Chi-Sing Leung
Publication Date: July 2009
pp. 287-297
We propose a novel reaction diffusion (RD) simulator to evolve image-resembling mazes. The evolved mazes faithfully preserve the salient interior structures in the source images. Since it is difficult to control the generation of desired patterns with trad...
 
All-Frequency Lighting with Multiscale Spherical Radial Basis Functions
Found in: IEEE Transactions on Visualization and Computer Graphics
By Ping-Man Lam, Tze-Yiu Ho, Chi-Sing Leung, Tien-Tsin Wong
Issue Date:January 2010
pp. 43-56
This paper proposes a novel multiscale spherical radial basis function (MSRBF) representation for all-frequency lighting. It supports the illumination of distant environment as well as the local illumination commonly used in practical applications, such as...
 
Refilming with Depth-Inferred Videos
Found in: IEEE Transactions on Visualization and Computer Graphics
By Guofeng Zhang, Zilong Dong, Jiaya Jia, Liang Wan, Tien-Tsin Wong, Hujun Bao
Issue Date:September 2009
pp. 828-840
Compared to still image editing, content-based video editing faces the additional challenges of maintaining the spatiotemporal consistency with respect to geometry. This brings up difficulties of seamlessly modifying video content, for instance, inserting ...
 
Consistent Depth Maps Recovery from a Video Sequence
Found in: IEEE Transactions on Pattern Analysis and Machine Intelligence
By Guofeng Zhang, Jiaya Jia, Tien-Tsin Wong, Hujun Bao
Issue Date:June 2009
pp. 974-988
This paper presents a novel method for recovering consistent depth maps from a video sequence. We propose a bundle optimization framework to address the major difficulties in stereo reconstruction, such as dealing with image noise, occlusions, and outliers...
 
Recovering consistent video depth maps via bundle optimization
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Jiaya Jia, Tien-Tsin Wong
Issue Date:June 2008
pp. 1-8
This paper presents a novel method for reconstructing high-quality video depth maps. A bundle optimization model is proposed to address the key issues, including image noise and occlusions, in stereo reconstruction. Our method not only uses the color const...
 
Interactive Reaction-Diffusion on Surface Tiles
Found in: Computer Graphics and Applications, Pacific Conference on
By Kui-Yip Lo, Hongwei Li, Chi-Wing Fu, Tien-Tsin Wong
Issue Date:November 2007
pp. 65-74
This paper proposes to perform reaction-diffusion on surface tiles. The square tiles fit nicely and cost-effectively in GPU memory, whereas we also apply distortion minimization on tiles so as to precisely reduce the unbalanced scale and resolution problem...
 
Moving Object Extraction with a Hand-held Camera
Found in: Computer Vision, IEEE International Conference on
By Guofeng Zhang, Jiaya Jia, Wei Xiong, Tien-Tsin Wong, Pheng-Ann Heng, Hujun Bao
Issue Date:October 2007
pp. 1-8
This paper presents a new method to detect and accurately extract the moving object from a video sequence taken by a hand-held camera. In order to extract the high quality moving foreground, previous approaches usually assume that the background is static ...
 
Isocube: Exploiting the Cubemap Hardware
Found in: IEEE Transactions on Visualization and Computer Graphics
By Liang Wan, Tien-Tsin Wong, Chi-Sing Leung
Issue Date:July 2007
pp. 720-731
<p><b>Abstract</b>—This paper proposes a novel six-face spherical map, <it>isocube</it>, that fully utilizes the cubemap hardware built in most GPUs. Unlike the cubemap, the proposed isocube uniformly samples the unit sphere (...
 
Stereoscopic Video Synthesis from a Monocular Video
Found in: IEEE Transactions on Visualization and Computer Graphics
By Guofeng Zhang, Wei Hua, Xueying Qin, Tien-Tsin Wong, Hujun Bao
Issue Date:July 2007
pp. 686-696
<p><b>Abstract</b>—This paper presents an automatic and robust approach to synthesize stereoscopic videos from ordinary monocular videos acquired by commodity video cameras. Instead of recovering the depth map, the proposed method synthes...
 
Tileable BTF
Found in: IEEE Transactions on Visualization and Computer Graphics
By Man-Kang Leung, Wai-Man Pang, Chi-Wing Fu, Tien-Tsin Wong, Pheng-Ann Heng
Issue Date:September 2007
pp. 953-965
This paper presents a modular framework to efficiently apply the bidirectional texture functions (BTF) onto object surfaces. The basic building blocks are the BTF tiles. By constructing one set of BTF tiles, a wide variety of objects can be textured seamle...
 
Robust Metric Reconstruction from Challenging Video Sequences
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Guofeng Zhang, Xueying Qin, Wei Hua, Tien-Tsin Wong, Pheng-Ann Heng, Hujun Bao
Issue Date:June 2007
pp. 1-8
Although camera self-calibration and metric reconstruction have been extensively studied during the past decades, automatic metric reconstruction from long video sequences with varying focal length is still very challenging. Several critical issues in prac...
 
Noise-Resistant Fitting for Spherical Harmonics
Found in: IEEE Transactions on Visualization and Computer Graphics
By Ping-Man Lam, Chi-Sing Leung, Tien-Tsin Wong
Issue Date:March 2006
pp. 254-265
<p><b>Abstract</b>—Spherical harmonic (SH) basis functions have been widely used for representing spherical functions in modeling various illumination properties. They can compactly represent low-frequency spherical functions. However, wh...
 
Dense Photometric Stereo Using Tensorial Belief Propagation
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Kam-Lun Tang, Chi-Keung Tang, Tien-Tsin Wong
Issue Date:June 2005
pp. 132-139
We address the normal reconstruction problem by photometric stereo using a uniform and dense set of photometric images captured at fixed viewpoint. Our method is robust to spurious noises caused by highlight and shadows and non-Lambertian reflections. To s...
 
A Markov Random Field Approach for Dense Photometric Stereo
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Kam-Lun Tang, Chi-Keung Tang, Tien-Tsin Wong
Issue Date:June 2005
pp. 1197
We present a surprisingly simple system that allows for robust normal reconstruction by photometric stereo using a uniform and dense set of photometric images captured at fixed viewpoint, in the presense of spurious noises caused by highlight, shadows and ...
   
Binary-Space-Partitioned Images for Resolving Image-Based Visibility
Found in: IEEE Transactions on Visualization and Computer Graphics
By Chi-Wing Fu, Tien-Tsin Wong, Wai-Shun Tong, Chi-Keung Tang, Andrew J. Hanson
Issue Date:January 2004
pp. 58-71
<p><b>Abstract</b>-We propose a novel 2D representation for 3D visibility sorting, the <it>Binary-Space-Partitioned Image (BSPI)</it>, to accelerate real-time image-based rendering. BSPI is an efficient 2D realization of a 3D ...
 
Data Compression for a Massive Image Data Set in IBMR
Found in: Computer Graphics International Conference
By Chi Sing Leung, Ping ManLam, Tien-Tsin Wong
Issue Date:July 2003
pp. 68
In the area of image-based modeling and rendering (IBMR), a new scene under a novel illumination condition is synthesized by interpolating reference images. However, for good quality rendering tremendous reference images under various illumination conditio...
 
Practical Super-Resolution from Dynamic Video Sequences
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Zhongding Jiang, Tien-Tsin Wong, Hujun Bao
Issue Date:June 2003
pp. 549
This paper introduces a practical approach for super-resolution, the process of reconstructing a high-resolution image from the low-resolution input ones. The emphasis of our work is to super-resolve frames from dynamic video sequences which may contain si...
 
Relighting with the Reflected Irradiance Field: Representation, Sampling and Reconstruction
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Zhouchen Lin, Tien-Tsin Wong, Heung-Yeung Shum
Issue Date:December 2001
pp. 561
Image-based relighting (IBL) is a technique to change the illumination of an image-based object/scene. In this paper, we define a representation called the reflected irradiance field which records the reflection from an object surface irradiated by a point...
 
Template-Matching Approach to Edge Detection of Volume Data
Found in: Medical Imaging and Augmented Reality, International Workshop on
By Lisheng Wang, Tien-Tsin Wong, Pheng Ann Heng, Jack Chun, Yiu Cheng
Issue Date:June 2001
pp. 0286
Abstract: This paper proposes a template-matching approach to the edge detection of volume data. Twenty-six templates of ideal step-like edge in the 3 ? 3 ? 3 neighborhood of volume data are given, and step-like edge of volume data is detected by matching ...
 
Interactive Relighting of Panoramas
Found in: IEEE Computer Graphics and Applications
By Tien-Tsin Wong, Pheng-Ann Heng, Chi-Wing Fu
Issue Date:March 2001
pp. 32-41
Due to the simplicity and efficiency of panoramic image representation, it has been successfully applied to Internet applications to provide an immersive illusion within a real or synthetic environment. However, once a scene has been captured as an image, ...
 
Illuminating image-based objects
Found in: Computer Graphics and Applications, Pacific Conference on
By T. Poston, H.T. Nguyen, Pheng-Ann Heng, Tien-Tsin Wong
Issue Date:October 1997
pp. 117
Skeleton climbing is an algorithm that builds triangulated isosurfaces in 3D grid data, more economically than marching cubes, and without the time penalty of current mesh decimation algorithms. Building the surface from its intersections with grid edges (...
 
Illuminating image-based objects
Found in: Computer Graphics and Applications, Pacific Conference on
By Tien-Tsin Wong, Pheng-Ann Heng, Siu-Hang Or, Wai-Yin Ng
Issue Date:October 1997
pp. 69
We present a new scheme of data representation for image-based objects. It allows the illumination to be changed interactively without knowing any geometrical information (e.g. depth or surface normal) of the scene, but the resulting images are physically ...
 
Two New Quorum Based Algorithms for Distributed Mutual Exclusion
Found in: Distributed Computing Systems, International Conference on
By Wai-Shing Luk, Tien-Tsin Wong
Issue Date:May 1997
pp. 100
Two novel suboptimal algorithms for mutual exclusion in distributed systems are presented. One is based on the modification of Maekawa's grid based quorum scheme. The size of quorums is approximately $\sqrt{2}\sqrt{N}$ where $N$ is the number of sites in a...
 
PCA-based compression for image-based relighting
Found in: Multimedia and Expo, IEEE International Conference on
By Pun-Mo Ho, Tien-Tsin Wong, Kwok-Hung Choy, Kwok-Hung Choy
Issue Date:July 2003
pp. 473-476
The ability to change illumination is a crucial factor in image-based modeling and rendering. Image-based relighting offers such capability. However, the trade-off is the enormous increase of storage requirement. In this paper, we propose a compression sch...
 
Resizing by symmetry-summarization
Found in: ACM Transactions on Graphics (TOG)
By Huisi Wu, Kun-Chuan Feng, Pheng-Ann Heng, Tien-Tsin Wong, Tong-Yee Lee, Yu-Shuen Wang, Huisi Wu, Kun-Chuan Feng, Pheng-Ann Heng, Tien-Tsin Wong, Tong-Yee Lee, Yu-Shuen Wang
Issue Date:December 2010
pp. 1-12
Image resizing can be achieved more effectively if we have a better understanding of the image semantics. In this paper, we analyze the translational symmetry, which exists in many real-world images. By detecting the symmetric lattice in an image, we can s...
     
Data-driven image color theme enhancement
Found in: ACM Transactions on Graphics (TOG)
By Baoyuan Wang, Chun Chen, Tien-Tsin Wong, Ying-Qing Xu, Yizhou Yu, Baoyuan Wang, Chun Chen, Tien-Tsin Wong, Ying-Qing Xu, Yizhou Yu
Issue Date:December 2010
pp. 1-12
It is often important for designers and photographers to convey or enhance desired color themes in their work. A color theme is typically defined as a template of colors and an associated verbal description. This paper presents a data-driven method for enh...
     
Change Blindness Images
Found in: IEEE Transactions on Visualization and Computer Graphics
By Li-Qian Ma, Kun Xu, Tien-Tsin Wong, Bi-Ye Jiang, Shi-Min Hu
Issue Date:November 2013
pp. 1808-1819
Change blindness refers to human inability to recognize large visual changes between images. In this paper, we present the first computational model of change blindness to quantify the degree of blindness between an image pair. It comprises a novel context...
 
Dense Photometric Stereo: A Markov Random Field Approach
Found in: IEEE Transactions on Pattern Analysis and Machine Intelligence
By Tai-Pang Wu, Kam-Lun Tang, Chi-Keung Tang, Tien-Tsin Wong
Issue Date:November 2006
pp. 1830-1846
We address the problem of robust normal reconstruction by dense photometric stereo, in the presence of complex geometry, shadows, highlight, transparencies, variable attenuation in light intensities, and inaccurate estimation in light directions. The input...
 
Computational manga and anime
Found in: SIGGRAPH Asia 2013 Courses (SA '13)
By Danqing Shi, Tien-Tsin Wong, Ying-Qing Xu, Takeo Igarashi
Issue Date:November 2013
pp. 1-52
Traditional manga (comic) and anime (cartoon) creation are painstaking processes. Even computers are utilized for the content creation, computers are mainly utilized as a naive digital canvas. With the increasing computing power and decreasing cost of CPU ...
     
Stereoscopizing cel animations
Found in: ACM Transactions on Graphics (TOG)
By Linling Zhang, Xiangyu Mao, Xuan Yang, Xueting Liu, Tien-Tsin Wong
Issue Date:November 2013
pp. 1-10
While hand-drawn cel animation is a world-wide popular form of art and entertainment, introducing stereoscopic effect into it remains difficult and costly, due to the lack of physical clues. In this paper, we propose a method to synthesize convincing stere...
     
Binocular tone mapping
Found in: ACM Transactions on Graphics (TOG)
By Linling Zhang, Pheng-Ann Heng, Tien-Tsin Wong, Xuan Yang
Issue Date:July 2012
pp. 1-10
By extending from monocular displays to binocular displays, one additional image domain is introduced. Existing binocular display systems only utilize this additional image domain for stereopsis. Our human vision is not only able to fuse two displaced imag...
     
Conjoining Gestalt rules for abstraction of architectural drawings
Found in: ACM Transactions on Graphics (TOG)
By Andrei Sharf, Baoquan Chen, Daniel Cohen-Or, Ke Xie, Liangliang Nan, Oliver Deussen, Tien-Tsin Wong
Issue Date:December 2011
pp. 1-15
We present a method for structural summarization and abstraction of complex spatial arrangements found in architectural drawings. The method is based on the well-known Gestalt rules, which summarize how forms, patterns, and semantics are perceived by human...
     
Conjoining Gestalt rules for abstraction of architectural drawings
Found in: Proceedings of the 2011 SIGGRAPH Asia Conference (SA '11)
By Andrei Sharf, Baoquan Chen, Daniel Cohen-Or, Ke Xie, Liangliang Nan, Oliver Deussen, Tien-Tsin Wong
Issue Date:December 2011
pp. 1-137
We present a method for structural summarization and abstraction of complex spatial arrangements found in architectural drawings. The method is based on the well-known Gestalt rules, which summarize how forms, patterns, and semantics are perceived by human...
     
Conjoining Gestalt rules for abstraction of architectural drawings
Found in: Proceedings of the 2011 SIGGRAPH Asia Conference (SA '11)
By Andrei Sharf, Baoquan Chen, Daniel Cohen-Or, Ke Xie, Liangliang Nan, Oliver Deussen, Tien-Tsin Wong
Issue Date:December 2011
pp. 1-10
We present a method for structural summarization and abstraction of complex spatial arrangements found in architectural drawings. The method is based on the well-known Gestalt rules, which summarize how forms, patterns, and semantics are perceived by human...
     
Making burr puzzles from 3D models
Found in: ACM SIGGRAPH 2011 papers (SIGGRAPH '11)
By Chi-Fu Lai, Chi-Wing Fu, Daniel Cohen-Or, Shiqing Xin, Tien-Tsin Wong, Ying He
Issue Date:August 2011
pp. 287-294
A 3D burr puzzle is a 3D model that consists of interlocking pieces with a single-key property. That is, when the puzzle is assembled, all the pieces are notched except one single key component which remains mobile. The intriguing property of the assembled...
     
Making burr puzzles from 3D models
Found in: ACM Transactions on Graphics (TOG)
By Chi-Fu Lai, Chi-Wing Fu, Daniel Cohen-Or, Shiqing Xin, Tien-Tsin Wong, Ying He
Issue Date:July 2011
pp. 1-33
A 3D burr puzzle is a 3D model that consists of interlocking pieces with a single-key property. That is, when the puzzle is assembled, all the pieces are notched except one single key component which remains mobile. The intriguing property of the assembled...
     
Resizing by symmetry-summarization
Found in: ACM SIGGRAPH Asia 2010 papers (SIGGRAPH ASIA '10)
By Huisi Wu, Kun-Chuan Feng, Pheng-Ann Heng, Tien-Tsin Wong, Tong-Yee Lee, Yu-Shuen Wang
Issue Date:December 2010
pp. 20-21
Image resizing can be achieved more effectively if we have a better understanding of the image semantics. In this paper, we analyze the translational symmetry, which exists in many real-world images. By detecting the symmetric lattice in an image, we can s...
     
Data-driven image color theme enhancement
Found in: ACM SIGGRAPH Asia 2010 papers (SIGGRAPH ASIA '10)
By Baoyuan Wang, Chun Chen, Tien-Tsin Wong, Ying-Qing Xu, Yizhou Yu
Issue Date:December 2010
pp. 20-21
It is often important for designers and photographers to convey or enhance desired color themes in their work. A color theme is typically defined as a template of colors and an associated verbal description. This paper presents a data-driven method for enh...
     
Structure-based ASCII art
Found in: ACM SIGGRAPH 2010 papers (SIGGRAPH '10)
By Linling Zhang, Tien-Tsin Wong, Xuemiao Xu
Issue Date:July 2010
pp. 10-18
The wide availability and popularity of text-based communication channels encourage the usage of ASCII art in representing images. Existing tone-based ASCII art generation methods lead to halftone-like results and require high text resolution for display, ...
     
Camouflage images
Found in: ACM SIGGRAPH 2010 papers (SIGGRAPH '10)
By Daniel Cohen-Or, Hung-Kuo Chu, Niloy J. Mitra, Tien-Tsin Wong, Tong-Yee Lee, Wei-Hsin Hsu
Issue Date:July 2010
pp. 10-18
Camouflage images contain one or more hidden figures that remain imperceptible or unnoticed for a while. In one possible explanation, the ability to delay the perception of the hidden figures is attributed to the theory that human perception works in two m...
     
Richness-preserving manga screening
Found in: ACM Transactions on Graphics (TOG)
By Pheng-Ann Heng, Tien-Tsin Wong, Wai-Man Pang, Yingge Qu
Issue Date:December 2008
pp. 1-49
Due to the tediousness and labor intensive cost, some manga artists have already employed computer-assisted methods for converting color photographs to manga backgrounds. However, existing bitonal image generation methods usually produce unsatisfactory uni...
     
Intrinsic colorization
Found in: ACM Transactions on Graphics (TOG)
By Chi-Sing Leung, Liang Wan, Pheng-Ann Heng, Stephen Lin, Tien-Tsin Wong, Xiaopei Liu, Yingge Qu
Issue Date:December 2008
pp. 1-49
In this paper, we present an example-based colorization technique robust to illumination differences between grayscale target and color reference images. To achieve this goal, our method performs color transfer in an illumination-independent domain that is...
     
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