Search Space Reduction for MRF Stereo (2009)
Liang Wang, Hailin Jin, Ruigang Yang
Abstract. We present an algorithm to reduce per-pixel search ranges for Markov Random Fields-based stereo algorithms. Our algorithm is based on the intuitions that reliably matched pixels need less...
Stereoscopic Inpainting: Joint Color and Depth Completion from Stereo Images (2009)
Liang Wang, Hailin Jin, Ruigang Yang, Minglun Gong
We present a novel algorithm for simultaneous color and depth inpainting. The algorithm takes stereo images and estimated disparity maps as input and fills in missing color and depth information...
Abstract Multi-Projector Display with Continuous Self-Calibration (2009)
Jin Zhou, Liang Wang, Amir Akbarzadeh, Ruigang Yang
Most existing calibration techniques for multi-projector display system require that the display configuration remain fixed during the display process. We in this paper present a new approach to...
Fusion of Time-of-Flight Depth and Stereo for High Accuracy Depth Maps (2009)
Jiejie Zhu, Liang Wang, Ruigang Yang, James Davis
Time-of-flight range sensors have error characteristics which are complementary to passive stereo. They provide real time depth estimates in conditions where passive stereo does not work well, such...
3D Medical Collaboration Technology to Enhance Emergency Healthcare (2009)
Gregory F. Welch; The University Of North Carolina At Chapel Hill, Diane H. Sonnenwald; University Of Gothenburg And The University Of Borås, Henry Fuchs; The University Of North Carolina At Chapel Hill, Bruce Cairns; The University Of North Carolina At Chapel Hill, Ketan Mayer-Patel; The University Of North Carolina At Chapel Hill, Hanna M. Söderholm; University Of Gothenburg And The University Of Borås, ...
Two-dimensional (2D) videoconferencing has been explored widely in the past 15–20 years to support collaboration in healthcare. Two issues that arise in most evaluations of 2D videoconferencing in...
Miao Liao, Liang Wang, Ruigang Yang
We present light fall-off stereo–LFS–a new method for computing depth from scenes beyond lambertian reflectance and texture. LFS takes a number of images from a stationary camera as the...
Examplar-based Shape from Shading (2008)
Xinyu Huang, Jizhou Gao, Liang Wang, Ruigang Yang
Traditional Shape-from-Shading (SFS) techniques aim to solve an under-constrained problem: estimating depth map from one single image. The results are usually brittle from real images containing...
Flexible Pixel Compositor for Plug-and-Play Multi-Projector Displays (2008)
Ruigang Yang, Daniel R. Rudolf, Vijai Raghunathan
Multi-projector, visually immersive displays have emerged as an important tool for a number of applications including scientific visualization, augmented reality, advanced teleconferencing, training,...
Ruigang Yang, Greg Welch, Gary Bishop
We present a novel use of commodity graphics hardware that effectively combines a plane-sweeping algorithm with view synthesis for real-time, on-line 3D scene acquisition and view synthesis. Using...
The Visual Computer manuscript No. (will be inserted by the editor) (2008)
Ruigang Yang, David Guinnip, Liang Wang
Abstract We present a novel approach to render low resolution point clouds with multiple high resolution textures— the type of data typical from passive vision systems. The low precision, noisy,...
Calibrating Pan-Tilt Cameras with Telephoto Lenses (2008)
Xinyu Huang, Jizhou Gao, Ruigang Yang
Abstract. Pan-tilt cameras are widely used in surveillance networks. These cameras are often equipped with telephoto lenses to capture objects at a distance. Such a camera makes full-metric...
Robust and Accurate Visual Echo Cancelation in a Full-duplex Projector-camera System (2008)
Miao Liao, Ruigang Yang, Zhengyou Zhang
In this paper we study the problem of “visual echo ” in a full-duplex projector-camera system for tele-collaboration applications. Visual echo is defined as the appearance of projected contents...
BRDF Invariant Stereo Using Light Transport (2008)
Liang Wang, Ruigang Yang, Ieee Computer Society, James E. Davis
Abstract—Nearly all existing methods for stereo reconstruction assume that scene reflectance is Lambertian and make use of brightness constancy as a matching invariant. We introduce a new invariant...
Improving, Expanding and Extending 3D Telepresence Abstract (2008)
Greg Welch, Henry Fuchs, Bruce Cairns, Ketan Mayer-patel, Diane H. Sonnenwald, Ruigang Yang, ...
For over a decade we have been pursuing a vision of threedimensional (3D) telepresence. Our primary driving problem is 3D medical consultation. Our basic goal is to enhance and expand medical...
Anselmo Lastra, Bruce Cairns, Herman Towles, Henry Fuchs, Immersive Electronic, Ruigang Yang, ...
books (IEBooks) for surgical training will let surgeons explore previous surgical procedures in 3D. The authors describe the techniques and tools for creating a preliminary IEBook embodying some of...
Automatic Natural Video Matting with Depth (2008)
Oliver Wang, Jonathan Finger, Qingxiong Yang, James Davis, Ruigang Yang
Video matting is the process of taking a sequence of frames, isolating the foreground, and replacing the background in each frame. We look at existing single-frame matting techniques and present a...
Abstract PixelFlex: A Reconfigurable Multi-Projector Display System (2007)
Ruigang Yang, David Gotz, Justin Hensley, Herman Towles
This paper presents PixelFlex – a spatially reconfigurable multi-projector display system. The PixelFlex system is composed of ceiling-mounted projectors, each with computer-controlled pan, tilt,...
Minglun Gong, Ruigang Yang, Liang Wang, Mingwei Gong
Abstract. Many vision applications require high-accuracy dense disparity maps in real-time and online. Due to time constraint, most real-time stereo applications rely on local winner-takes-all...
Robust and Accurate Visual Echo Cancelation in a Full-duplex Projector-camera System (2007)
Miao Liao, Ruigang Yang, Zhengyou Zhang
In this paper we study the problem of “visual echo ” in a full-duplex projector-camera system for tele-collaboration applications. Visual echo is defined as the ap-pearance of projected contents...
Stereo Matching with Color-Weighted Correlation, Hierarchical Belief (2006)
Propagation And Occlusion, Qìngxióng Yáng, Liang Wang, Ruigang Yang, Henrik Stewénius, David Nistér
In this paper, we formulate an algorithm for the stereo matching problem with careful handling of disparity, discontinuity and occlusion. The algorithm works with a global matching stereo model based...
How far can we go with local optimization in real-time stereo matching (2006)
Liang Wang, Mingwei Gong, Minglun Gong, Ruigang Yang
Applications such as robot navigation and augmented reality require high-accuracy dense disparity maps in real-time and online. Due to time constraint, most realtime stereo applications rely on local...
Improving, expanding and extending 3D telepresence (2005)
Welch, Greg F., Fuchs, Henry, Mayer-Patel, Ketan, Cairns, Bruce, Sonnenwald, Diane H., Yang, Ruigang, ...
Remote 3D medical consultation (2005)
Welch, Greg F., Sonnenwald, Diane H., Mayer-Patel, Kelly, Yang, Ruigang, State, Andrei, Towles, Herman, ...
Books Iebooks For, Anselmo Lastra, Bruce Cairns, Herman Towles, Henry Fuchs, Immersive Electronic, ...
ursued related work formally and informally with multiple collaborators. In 2002, we presented an intermediate summary of results from a three-year effort incorporating teleimmersion technologies...
Remote 3D Medical Consultation (2005)
Greg Welch Diane, Diane H. Sonnenwald, Ketan Mayer-patel, Ruigang Yang, Andrei State, Herman Towles, ...
Two-dimensional (2D) video-based telemedical consultation has been explored widely in the past 15--20 years. Two issues that seem to arise in most relevant case studies are the difficulty associated...
Remote 3D medical consultation (2005)
Greg Welch, Diane H. Sonnenwald, Ketan Mayer-patel, Ruigang Yang, Andrei State, Herman Towles, ...
Abstract — Two-dimensional (2D) video-based telemedical consultation has been explored widely in the past 15– 20 years. Two issues that seem to arise in most relevant case studies are the...
Geometric and photometric restoration of distorted documents (2005)
Mingxuan Sun, Ruigang Yang, Lin Yun, George L, Brent Seales, Michael S. Brown
We present a system to restore the 2D content printed on distorted documents. Our system works by acquiring a 3D scan of the document’s surface together with a high-resolution image. Using the 3D...
Improving, expanding and extending 3D telepresence (2005)
Welch, Greg F., Fuchs, Henry, Mayer-Patel, Ketan, Cairns, Bruce, Sonnenwald, Diane H., Yang, Ruigang, ...
Remote 3D medical consultation (2005)
Welch, Greg F., Sonnenwald, Diane H., Mayer-Patel, Kelly, Yang, Ruigang, State, Andrei, Towles, Herman, ...
3D Telepresence for off-line surgical training and on-line remote consultation (2004)
Welch, Greg F., Yang, Ruigang, Cairns, Bruce, Towles, Herman, State, Andrei, Ilie, Adrian, ...
Ruigang Yang, Marc Pollefeys, Hua Yang, Greg Welch
We present a new method for using commodity graphics hardware to achieve real-time, on-line, 2D view synthesis or 3D depth estimation from two or more calibrated cameras. Our method combines a 3D...
A Unified Approach to Real-Time, (2004)
Ruigang Yang, Marc Pollefeys, Hua Yang, Greg Welch
We present a new method for using commodity graphics hardware to achieve real-time, on-line, 2D view synthesis or 3D depth estimation from two or more calibrated cameras. Our method combines a 3D...
3d telepresence for off-line surgical training and on-line remote consultation (2004)
Greg Welch, Ruigang Yang, Bruce Cairns, Herman Towles, Dan Russo, ...
We present an overview of multi-year efforts aimed at developing technology to support natural telepresence over time for off-line surgical training, and over space for on-line or “live ” remote...
3D Telepresence for off-line surgical training and on-line remote consultation (2004)
Welch, Greg F., Yang, Ruigang, Cairns, Bruce, Towles, Herman, State, Andrei, Ilie, Adrian, ...
Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2003.
View-dependent pixel coloring : a physically-based approach for 2D view synthesis / (2003)
Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2003.
Ruigang Yang, G Welch Advisor, Ruigang Yang
iii iv RUIGANG YANG: View-Dependent Pixel Coloring – A Physically-Based Approach for 2D View Synthesis. (Under the direction of Greg Welch.) The basic goal of traditional computer graphics is to...
Ruigang Yang, G Welch Advisor, Ruigang Yang
iii iv RUIGANG YANG: View-Dependent Pixel Coloring – A Physically-Based Approach for 2D View Synthesis. (Under the direction of Greg Welch.) The basic goal of traditional computer graphics is to...
Ruigang Yang, Marc Pollefeys, Greg Welch
We present two extensions to the Space Carving framework. The first is a progressive scheme to better reconstruct surfaces lacking sufficient textures. The second is a novel photo-consistency measure...
Ruigang Yang, Marc Pollefeys, Greg Welch
We present two extensions to the Space Carving framework. The first is a progressive scheme to better reconstruct surfaces lacking sufficient textures. The second is a novel photo-consistency measure...
Celso S. Kurashima, Ruigang Yang, Anselmo Lastra
We present a hybrid system using computer vision and graphics methods that effectively combines fast automatic 3D model extraction with view-dependent texture mapping for the purpose of real-time...
Model-based head pose tracking with stereovision (2002)
We present a robust model-based stereo head tracking algorithm that operates in real time on a commodity PC. The use of an individualized three-dimensional head model, coupled with the epipolar...
Creating Adaptive Views for Group Video Teleconferencing – An Image-Based Approach (2002)
Ruigang Yang, Celso Kurashima, Andrew Nashel, Herman Towles, Anselmo Lastra, Henry Fuchs
We present a system and techniques for synthesizing views for many-to-many video teleconferencing. Instead of replicating oneto-one systems for each pair of users, or performing complex 3D scene...
Eye Gaze Correction with Stereovision for Video-Teleconferencing (2002)
Abstract. The lack of eye contact in desktop video teleconferencing substantially reduces the effectiveness of video contents. While expensive and bulky hardware is available on the market to correct...
H.: 3D Tele-Collaboration over internet 2 (2002)
Herman Towles, Wei-chao Chen, Ruigang Yang, Sang-uok Kum, Henry Fuchs, Carolina Chapel Hill, ...
Figure 1: Our 3D tele-immersion realization with the local user manipulating the visible human data set using a virtual laser pointer. The local user sees the remote collaborator in perspectively...
Celso S. Kurashima, Ruigang Yang, Anselmo Lastra
Abstract. We present a hybrid system using computer vision and graphics methods that effectively combines fast automatic 3D model extraction with view-dependent texture mapping for the purpose of...
Fast image segmentation and smoothing using commodity graphics hardware (2002)
Abstract. We present a novel use of commodity graphics hardware to perform real-time image segmentation and image morphology operations. Our preliminary results show a performance increase of over 30...
Automatic and Continuous Projector Display Surface Calibration Using Every-Day Imagery (2001)
Projector-based display systems have been used in computer graphics for about as long as the field has existed. While projector-based systems have many advantages, a significant disadvantage is the...
Automatic Projector Display Surface Estimation Using Every-Day Imagery (2001)
Projector-based display systems have been used in computer graphics for about as long as the field has existed. While projector-based systems have many advantages, a significant disadvantage is the...
Eye Gaze Correction with Stereovision for Video-Teleconferencing (2001)
This paper presents a novel approach that is based on stereo analysis combined with rich domain knowledge (a personalized face model). This marriage is mutually beneficial. The personalized face...
Model-based Head Pose Tracking with Stereovision (2001)
Contents 1 Introduction 2 2 Related Works 2 3 System Overview 3 4 Stereo 3D Head Pose Tracking 3 4.1 Models ............................................ 4 4.2 Stereo Tracking...
Geometrically correct imagery for teleconferencing (1999)
Ruigang Yang, Michael S. Brownt, W. Brent, Sealest Henry Fuchs
Current camera-monitor teleconferencing applications pro-duce unrealistic imagery and break any sense of presence for the participants. Other capture/display technologies can be used to provide more...
Multi-Projector Displays Using Camera-Based Registration (1999)
Ramesh Raskar, Michael Brown, Ruigang Yang, Wei-chao Chen, Greg Welch, Herman Towles, ...
Conventional projector-based display systems are typically designed around precise and regular configurations of projectors and display surfaces. While this results in rendering simplicity and speed,...
Multi-Projector Displays Using Camera-Based Registration (1999)
Ramesh Raskar, Michael Brown, Ruigang Yang, Wei-chao Chen, Greg Welch, Herman Towles, ...
Conventional projector-based display systems are typically designed around precise and regular configurations of projectors and display surfaces. While this results in rendering simplicity and speed,...
Geometrically correct imagery for teleconferencing (1999)
Ruigang Yang, Michael S. Brown, W. Brent Seales, Henry Fuchs
Current camera-monitor teleconferencing applications produce unrealistic imagery and break any sense of presence for the participants. Other capture/display technologies can be used to provide more...
Registering, integrating, and building cad models from range data (1998)
In this paper, we introduce two methods for the registration of multiple range images when a prior estimate of the transformation between views is not available and the overlap between range images...
Registering, integrating, and building cad models from range data (1998)
We introduce two methods for the registration of range images when a prior estimate of the transformation between views is not available and the overlap between images is relatively small. The...
Registering, integrating, and building cad models from range data (1998)
We introduce two methods for the registration of range images when a prior estimate of the transformation between views is not available and the overlap between images is relatively small. The...