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Displaying 1-39 out of 39 total
GL4D: A GPU-based Architecture for Interactive 4D Visualization
Found in: IEEE Transactions on Visualization and Computer Graphics
By Alan Chu, Chi-Wing Fu, Andrew Hanson, Pheng-Ann Heng
Issue Date:November 2009
pp. 1587-1594
This paper describes GL4D, an interactive system for visualizing 2-manifolds and 3-manifolds embedded in four Euclidean dimensions and illuminated by 4D light sources. It is a tetrahedron-based rendering pipeline that projects geometry into volume images, ...
 
A virtual surgical simulator for mandibular angle reduction based on patient specific data
Found in: Virtual Reality Conference, IEEE
By Qiong Wang,Hui Chen,Wen Wu,Hai Yang Jin,Pheng Ann Heng
Issue Date:March 2012
pp. 85-86
In our work, a virtual reality-based surgical simulator for the mandibular angle reduction was designed and implemented on CUDA-based platform. High-fidelity visual and haptic feedbacks between the surgical instruments and the bone material are provided to...
 
Learning Blood Management in Orthopedic Surgery through Gameplay
Found in: IEEE Computer Graphics and Applications
By Jing Qin, Yim-Pan Chui, Wai-Man Pang, Kup-Sze Choi, Pheng-Ann Heng
Issue Date:March 2010
pp. 45-57
Orthopedic surgery treats the musculoskeletal system, in which bleeding is common and can be fatal. To help train future surgeons in this complex practice, researchers designed and implemented a serious game for learning orthopedic surgery. The game focuse...
 
Video Facial Feature Tracking with Enhanced ASM and Predicted Meanshift
Found in: Computer Modeling and Simulation, International Conference on
By Bo Pu,Shuang Liang,Yongming Xie,Zhang Yi,Pheng-Ann Heng
Issue Date:January 2010
pp. 151-155
The Active Shape Model (ASM) has been widely used to recognize and track a face from a video sequence. However, it is usually limited to frontal view or the cases of small-scale head movement, as its accuracy may greatly degrade in conditions of quick move...
 
A Physically-Based Modeling and Simulation Framework for Facial Animation
Found in: Image and Graphics, International Conference on
By Weiming Wang, Xiaoqi Yan, Yongming Xie, Jing Qin, Wai-Man Pang, Pheng-Ann Heng
Issue Date:September 2009
pp. 521-526
Realistic facial animation is important in many graphics applications, like animated feature films and computer games, to enrich human computer interaction. In this paper, we propose a physically-based facial animation approach employing knowledge from the...
 
Accelerating Algebraic Reconstruction Using CUDA-Enabled GPU
Found in: Computer Graphics, Imaging and Visualization, International Conference on
By Yuqiang Lu, Weiming Wang, Shifu Chen, Yongming Xie, Jing Qin, Wai-Man Pang, Pheng-Ann Heng
Issue Date:August 2009
pp. 480-485
In this paper, we apply the Compute Unified Device Architecture (CUDA) to the 3D cone-beam CT reconstruction using Simultaneous Algebraic Reconstruction Technique (SART). With the hardware acceleration, the computationally complex SART can run at speed com...
 
Perception-aware Depth Cueing for Illustrative Vascular Visualization
Found in: BioMedical Engineering and Informatics, International Conference on
By Alan Chu, Wing-Yin Chan, Jixiang Guo, Wai-Man Pang, Pheng-Ann Heng
Issue Date:May 2008
pp. 341-346
Illustrative visualization of complex vasculature hasbeen one of the indispensable components in medical educationand training. In this paper, we propose a rendering pipeline which incorporates various perception-aware techniques for informative vascular i...
 
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...
 
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 ...
 
Principal stream surfaces
Found in: Visualization Conference, IEEE
By Wenli Cai, Pheng-Ann Heng
Issue Date:October 1997
pp. 75
The use of stream surfaces and streamlines is well established in vector visualization. However, the proper placement of starting points is critical for these constructs to clearly illustrate the flow topology. In this paper, we present the principal strea...
 
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 ...
 
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...
 
Impulse-Based Rendering Methods for Haptic Simulation of Bone-Burring
Found in: IEEE Transactions on Haptics
By Qiong Wang,Hui Chen,Wen Wu,Jing Qin,Pheng Ann Heng
Issue Date:September 2012
pp. 344-355
Bone-burring is a common procedure in orthopedic, dental, and otologic surgeries. Virtual reality (VR)-based surgical simulations with both visual and haptic feedbacks provide novice surgeons with a feasible and safe way to practice their burring skill. Ho...
 
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 ...
 
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...
 
Enhancing View Consistency in Collaborative Medical Visualization Systems Using Predictive-Based Attitude Estimation
Found in: Medical Imaging and Augmented Reality, International Workshop on
By Yim-Pan Chui, Pheng-Ann Heng
Issue Date:June 2001
pp. 0292
Abstract: Nowadays, medical diagnosis in critical diseases are seldom executed by only one person. Often, in difficult cases, two or more physicians are involved to reach a diagnosis. The growth of World Wide Web and the modern trend of cooperative work in...
 
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, ...
 
Clustering Categorical Data
Found in: Data Engineering, International Conference on
By Yi Zhang, Ada Wai-chee Fu, Chun Hing Cai, Pheng Ann Heng
Issue Date:March 2000
pp. 305
In this paper we propose two methods to study the problem of clustering categorical data. The first method is based on dynamical system approach. The second method is based on the graph partitioning approach.
   
Resizing by symmetry-summarization
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 (...
 
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...
     
A Catheterization-Training Simulator Based on a Fast Multigrid Solver
Found in: IEEE Computer Graphics and Applications
By Shun Li, Jixiang Guo, Qiong Wang, Qiang Meng, Yim-Pan Chui, Jing Qin, Pheng-Ann Heng
Issue Date:November 2012
pp. 56-70
A VR-based simulator helps trainees develop skills for catheterization, a fundamental but difficult procedure in vascular interventional radiology. A deformable model simulates the complicated behavior of guide wires and catheters, using the principle of m...
 
Fast Rendering of Diffusion Curves with Triangles
Found in: IEEE Computer Graphics and Applications
By Wai-Man Pang,Jing Qin,Michael Cohen,Pheng-Ann Heng,Kup-Sze Choi
Issue Date:July 2012
pp. 68-78
Diffusion curves are a new kind of primitive in vector graphics, capable of representing smooth color transitions among boundaries. Their rendering requires solving Poisson's equation; much previous research relied on traditional solvers, which commonly re...
 
Using Time-Varying Texels to Simulate Withering Grassland
Found in: IEEE Computer Graphics and Applications
By shaohui Jiao, Wen Wu, Pheng-Ann Heng, Enhua Wu
Issue Date:January 2012
pp. 78-86
Time-varying texels (TVTs) simulate the withering dynamics of grassland. TVTs employ a hybrid texel-and-points scheme, allowing the volume models to handle time-varying simulations. The modeling of grass carries out physically based calculations on the poi...
 
A Virtual Reality Simulator for Ultrasound-Guided Biopsy Training
Found in: IEEE Computer Graphics and Applications
By Dong Ni, Wing Yin Chan, Jing Qin, Yim-Pan Chui, Ingrid Qu,S S M Ho, Pheng-Ann Heng
Issue Date:March 2011
pp. 36-48
A VR-based training system for practicing biopsies simulates ultrasound imagery by stitching multiple ultrasound volumes on the basis of a 3D scale-invariant feature transform algorithm. In addition, a six-degree-of-freedom force model delivers a realistic...
 
Adaptive Attitude Dead-Reckoning by Cumulative Polynomial Extrapolation of Quaternions
Found in: Distributed Simulation and Real Time Applications, IEEE/ACM International Symposium on
By Yim-Pan Chui, Pheng-Ann Heng
Issue Date:August 2001
pp. 0045
Abstract: In this paper, we propose a new attitude dead reckoning paradigm in collaborative virtual environment (CVE). We derive a general polynomial construction scheme of attitude trajectory that uses a number of previous packets in order to extrapolate ...
 
Interactive Visualization for Rapid Noninvasive Cardiac Assessment
Found in: Computer
By Meiyappan Solaiyappan, Tim Poston, Pheng Ann Heng, Elliot R. McVeigh, Michael A. Guttman, Elias A. Zerhouni
Issue Date:January 1996
pp. 55-62
<p>New developments in computerized visualization may let doctors use one noninvasive exam to thoroughly evaluate patients with heart problems, saving both time and money. The authors describe how improved visualization techniques, combined with the ...
 
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...
     
An ellipsoid-based perspective projection correction for wide-angle images
Found in: SIGGRAPH Asia 2011 Posters (SA '11)
By Pheng-Ann Heng, Tanchao Zhu, Weiming Wang, Yongming Xie
Issue Date:December 2011
pp. 1-1
Wide-angle images have been wisely used in many areas since they can provide much larger field-of-view (FOV) of a scene. But distortions in these images disturb users' perception and many research works have been investigated to tackle this problem. Up to ...
     
WYSIWYF: exploring and annotating volume data with a tangible handheld device
Found in: Proceedings of the 2011 annual conference on Human factors in computing systems (CHI '11)
By Chi-Wing Fu, Peng Song, Pheng-Ann Heng, Qiang Meng, Wooi Boon Goh
Issue Date:May 2011
pp. 1333-1342
Visual exploration of volume data often requires the user to manipulate the orientation and position of a slicing plane in order to observe, annotate or measure its internal structures. Such operations, with its many degrees of freedom in 3D space, map poo...
     
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...
     
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...
     
Structure-aware halftoning
Found in: ACM Transactions on Graphics (TOG)
By Daniel Cohen-Or, Pheng-Ann Heng, Tien-Tsin Wong, Wai-Man Pang, Yingge Qu
Issue Date:August 2008
pp. 1-49
This paper presents an optimization-based halftoning technique that preserves the structure and tone similarities between the original and the halftone images. By optimizing an objective function consisting of both the structure and the tone metrics, the g...
     
Deringing cartoons by image analogies
Found in: ACM Transactions on Graphics (TOG)
By Guangyu Wang, Pheng-Ann Heng, Tien-Tsin Wong
Issue Date:October 2006
pp. 1360-1379
In this article, we propose a novel method to reduce ringing artifacts in BDCT-encoded cartoon images using image analogies. The quantization procedure of BDCT compression (such as JPEG and MPEG) introduces annoying visual artifacts. Our main focus is on t...
     
Manga colorization: Copyright restrictions prevent ACM from providing the full text for this work.
Found in: ACM SIGGRAPH 2006 Papers (SIGGRAPH '06)
By Pheng-Ann Heng, Tien-Tsin Wong, Yingge Qu
Issue Date:July 2006
pp. 85-es
This paper proposes a novel colorization technique that propagates color over regions exhibiting pattern-continuity as well as intensity-continuity. The proposed method works effectively on colorizing black-and-white manga which contains intensive amount o...
     
Manga colorization: Copyright restrictions prevent ACM from providing the full text for this work.
Found in: Material presented at the ACM SIGGRAPH 2006 conference (SIGGRAPH '06)
By Pheng-Ann Heng, Tien-Tsin Wong, Yingge Qu
Issue Date:July 2006
pp. 85-es
This paper proposes a novel colorization technique that propagates color over regions exhibiting pattern-continuity as well as intensity-continuity. The proposed method works effectively on colorizing black-and-white manga which contains intensive amount o...
     
Digital photo similarity analysis in frequency domain and photo album compression
Found in: Proceedings of the 3rd international conference on Mobile and ubiquitous multimedia (MUM '04)
By Pheng-Ann Heng, Tien-Tsin Wong, Yang Lu
Issue Date:October 2004
pp. 237-244
With the increasing popularity of digital camera, organizing and managing the large collection of digital photos effectively are therefore required. In this paper, we study the techniques of photo album sorting, clustering and compression in DCT frequency ...
     
The immersive cockpit
Found in: Proceedings of the tenth ACM international conference on Multimedia (MULTIMEDIA '02)
By Pheng-Ann Heng, Tien-Tsin Wong, Wai-Kwan Tang
Issue Date:December 2002
pp. 658-659
Wide field-of-view (FOV) is necessary for many industrial applications, such as air traffic control, large vehicle driving and navigation. Unfortunately, the supporting structure/frame in most systems usually blocks part of the view, results in "blind spot...
     
Direct haptic rendering of isosurface by intermediate representation
Found in: Proceedings of the ACM symposium on Virtual reality software and technology (VRST '00)
By Hanqiu Sun, Kwong-Wai Chen, Pheng-Ann Heng
Issue Date:October 2000
pp. 188-194
With the development of volume visualization methods, we can easily extract meaningful information from volumetric data using interactive graphics and imaging. Haptic interaction of volumetric data adds a new modality to volume visualization that has an ad...
     
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