Recovering Consistent Video Depth Maps via Bundle Optimization (2009)
Guofeng Zhang, Jiaya Jia, Tien-tsin Wong, Hujun Bao
input sequence output video depth maps Figure 1. High-quality depth reconstruction from the video sequence “Road ” containing complex occlusions. Left: An input video sequence taken by a moving...
H.: Moving object extraction with a hand-held camera (2009)
Guofeng Zhang, Jiaya Jia, Wei Xiong, Tien-tsin Wong, Pheng-ann Heng, Hujun Bao
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...
Moving Object Extraction with a Hand-held Camera (2009)
Guofeng Zhang, Jiaya Jia, Wei Xiong, Tien-tsin Wong, Pheng-ann Heng, Hujun Bao
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...
Dense Photometric Stereo: A Markov Random Field Approach (2008)
Tai-pang Wu, Student Member, Kam-lun Tang, Chi-keung Tang, Senior Member, Tien-tsin Wong
Abstract—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...
Manga Colorization, Yingge Qu, Tien-tsin Wong, Pheng-ann Heng
This paper proposes a novel colorization technique that propagates color over regions exhibiting pattern-continuity as well as intensitycontinuity. The proposed method works effectively on colorizing...
Intelligent Inferencing and Haptic Simulation for Chinese Acupuncture Learning and Training (2008)
Pheng-ann Heng, Tien-tsin Wong, Rong Yang, Yim-pan Chui, Yongming Xie, Kwong-sak Leung, ...
Abstract — This paper presents an intelligent virtual environment for Chinese acupuncture learning and training using state-of-the-art virtual reality technology. It is the first step towards...
FINAL VERSION 1 Isocube: Exploiting the Cubemap Hardware (2008)
Liang Wan, Tien-tsin Wong, Chi-sing Leung
Abstract — This paper proposes a novel six-face spherical map, isocube, that fully utilizes the cubemap hardware built in most GPUs. Unlike the cubemap, the proposed isocube uniformly samples the...
VIRTUAL BRONCHOSCOPY Pheng-Ann Heng, Ping-Fu Fung, (2008)
Kwong-sak Leung, Han-qiu Sun, Tien-tsin Wong
Patients potentially suffer and are exposed to danger during invasive bronchoscopic diagnosis and surgery. In order to reduce this hazardous risk, we have developed an interactive virtual environment...
Deringing Cartoons by Image Analogies (2008)
Guangyu Wang, Tien-tsin Wong, Pheng-ann Heng
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)...
Pun-mo Ho, Tien-tsin Wong, Chi-sing Leung
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...
Support Vector Clustering for Brain Activation Detection (2008)
Defeng Wang, Lin Shi, Daniels. Yeung, Pheng-ann Heng, Tien-tsin Wong
Abstract. In this paper, we propose a new approach to detect activated time series in functional MRI using support vector clustering (SVC).We extract Fourier coefficients as the features of fMRI time...
Three-Dimensional Image Warping on Programmable Graphics Hardware (2008)
Zhongding Jiang, Tien-tsin Wong, Hujun Bao
Many image-based rendering systems are based on three-dimensional image warping (3D Warping), which transforms pixels in reference image to destination view. However, the original 3D warping...
Depth Image Sequences Compression Using Programmable Graphics Hardware (2008)
Zhongding Jiang, Tien-tsin Wong, Hujun Bao
Depth image-based representation (DIMR) has recently been adopted into MPEG-4 Animation Framework eXtension (AFX). However, how to compress depth image sequences is not addressed. In this paper, we...
Solving Visibility with Epipolar Geometry (2007)
In this paper, we use a graphically explaination on how epipolar geometry can be used to solve the visibility. This is paper is prepared mainly for teaching purpose. 1 Introduction Traditional...
Tim Poston, Tien-tsin Wong, Pheng-ann Heng
An isosurface extraction algorithm which can directly generate multiresolution isosurfaces from volume data is introduced. It generates low resolution isosurfaces, with 4 to 25 times fewer triangles...
Solid texture synthesis from 2D Exemplars (2007)
Kopf, Johannes, Fu, Chi-Wing, Cohen-Or, Daniel, Deussen, Oliver, Lischinski, Dani, Wong, Tien-Tsin
We present a novel method for synthesizing solid textures from 2D texture exemplars. First, we extend optimization-based 2D texture synthesis to synthesize 3D texture solids. Next, the non-parametric...
Interactive reaction-diffusion on surface tiles (2007)
Lo, Kui-Yip, Li, Hongwei, Fu, Chi-Wing, Wong, Tien-Tsin
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...
Leung, Man-Kang, Pang, Wai-Man, Fu, Chi-Wing, Wong, Tien-Tsin, Heng, Pheng-Ann
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...
Dense photometric stereo using tensorial belief propagation (2005)
Tang, Kam-Lun, Tang, Chi-Keung, Wong, Tien-Tsin
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...
Practical super-resolution from dynamic video sequenes (2003)
Zhongding Jiang, Tien-tsin Wong, Hujun Bao
This paper introduces a practical approach for superresolution, the process of reconstructing a high-resolution image from the low-resolution input ones. The emphasis of our work is to super-resolve...
The Plenoptic Illumination Function (2002)
Tien-tsin Wong, Chi-wing Fu, Chi-wing Fu, Pheng-ann Heng, Pheng-ann Heng, Chi-sing Leung, ...
Image-based modeling and rendering has been demonstrated as a cost-effective and efficient approach to virtual reality applications. The computational model that most image-based techniques are based...
Computing visibility for triangulated panoramas (1999)
Chi-wing Fu, Tien-tsin Wong, Pheng-ann Heng
Abstract. A visibility algorithm for triangulated panoramas is proposed. The algorithm can correctly resolve the visibility without making use of any depth information. It is especially useful when...
Thesis (Ph. D.)--Chinese University of Hong Kong, 1998.
Triangle-based View Interpolation Without Depth-Buffering (1998)
Chi-wing Fu, Tien-tsin Wong, Pheng-ann Heng
In this paper, we propose a triangle-based view interpolation algorithm which can correctly resolve the visibility problem without depth-buffering. The algorithm is especially useful when depth...
Accurate B-spline freeform deformation of polygonal objects (1998)
Jieqing Feng, Pheng-ann Heng, Tien-tsin Wong
Free-form deformation is an important geometric shape modification method in computer animation and geometric modeling. We explore it by means of functional composition via shifting operators. Our...
Triangle-based View Interpolation Without Depth-Buffering (1998)
Chi-Wing Fu, Tien-tsin Wong, Pheng-ann Heng
In this paper, we propose a triangle-based view interpolation algorithm which can correctly resolve the visibility problem without depth-buffering. The algorithm is especially useful when depth...
Accurate B-spline freeform deformation of polygonal objects (1998)
Jieqing Feng, Pheng-ann Heng, Tien-tsin Wong
Free-form deformation is an important geometric shape modification method in computer animation and geometric modeling. We explore it by means of functional composition via shifting operators. Our...
Two new quorum based algorithms for distributed mutual exclusion (1997)
Two novel suboptimal algorithms for mutual exclusion in distributed systems are presented. One is based on the modi cation of Maekawa's grid based quorum scheme. The size of quorums is...
Two New Quorum Based Algorithms for Distributed Mutual Exclusion (1997)
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...
Image-based Rendering with Controllable Illumination (1997)
Tien-tsin Wong, Pheng-ann Heng, Siu-Hang Or, Wai-yin Ng
: A new image-based rendering method, based on the light field and Lumigraph system, allows illumination to be changed interactively. It does not try to recover or use any geometrical information...
Two New Quorum Based Algorithms for Distributed Mutual Exclusion (1997)
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...