Aayush Sharma, Gang Hua, Zicheng Liu, Zhengyou Zhang
The ever-increasing gigantic amount of images over the web necessitates automatic schemes for meta-tagging content descriptions such as object categories. These meta-tags are essential to text-based...
Zhengyou Zhang, Qin Cai, Jack W. Stokes
This paper proposes a novel scheme for acoustic echo cancellation (AEC) in multi-party, spatialized audio conferencing by exploring the constraints among the adaptive filters for each synthesized...
A flexible new technique for camera calibration (2009)
Zhengyou Zhang, Zhengyou Zhang
(updated on Aug. 10, 2002; a typo in Appendix B) (last updated on Aug. 13, 2008; a typo in Section 3.3)
OFFICE PRESENCE DETECTION USING MULTIMODAL CONTEXT INFORMATION (2009)
Xiao Huang, Juyang Weng, Zhengyou Zhang
An office presence detection system is presented in this paper. Context information from multi-sensory inputs is integrated to infer a user’s activities in an office. We design a layered...
LEARNING-BASED PERCEPTUAL IMAGE QUALITY IMPROVEMENT FOR VIDEO CONFERENCING (2009)
Zicheng Liu, Cha Zhang, Zhengyou Zhang
It is well known that in professional TV show filming, stage lighting has to be carefully designed in order to make the host and the scene look visually appealing. The lighting affects not only the...
Zhengyou Zhang, Rachid Deriche, Olivier Faugeras, Quang-tuan Luong, Zhengyou Zhang, Rachid Deriche, ...
Robotique, image et vision apport de recherche
Michel Buffa, Olivier D. Faugeras, Zhengyou Zhang
Our robot is equipped with a trinocular vision system that has been put into hardware and delivers 3D maps of the environment at a rate between 1 and 5Hz. Those 3D maps contain line segments...
Semantic Saliency Driven Camera Control for Personal Remote Collaboration (2009)
Cha Zhang, Zicheng Liu, Zhengyou Zhang, Qi Zhao
Abstract—This paper presents a camera combo system for personal remote collaboration applications. The system consists of two different cameras. One camera has a wide field of view, and the other...
Real time correlation-based stereo: (2009)
Olivier Faugeras, Bernard Hotz, Herv Mathieu, Zhengyou Zhang, Pascal Fua, Laurent Moll, ...
algorithm, implementations and applications
Virtual View Generation with a Hybrid Camera Array (2009)
Tola, Engin, Zhang, Cha, Cai, Qin, Zhang, Zhengyou
Virtual view synthesis from an array of cameras has been an essential element of three-dimensional video broadcasting/conferencing. In this paper, we propose a scheme based on a hybrid camera array...
Face Re-Lighting from a Single Image under Harsh Lighting Conditions (2008)
Yang Wang, Zicheng Liu, Gang Hua, Zhen Wen, Zhengyou Zhang, Dimitris Samaras
In this paper, we present a new method to change the illumination condition of a face image, with unknown face geometry and albedo information. This problem is particularly difficult when there is...
Amarnag Subramanya, Zhengyou Zhang, Arun C. Surendran, Patrick Nguyen, Mukund Narasimhan, Alex Acero
Speaker Verification can be treated as a statistical hypothesis testing problem. The most commonly used approach is the likelihood ratio test (LRT), which can be shown to be optimal using the...
Amarnag Subramanya, Zhengyou Zhang, Zicheng Liu, Alex Acero
A good speech model is essential for speech enhancement, but it is very difficult to build because of huge intra- and extra-speaker variation. We present a new speech model for speech enhancement,...
A whiteboard provides a large shared space for the participants to focus their attention and express their ideas, and is therefore a great collaboration tool for information workers. However, it has...
Face Re-Lighting from a Single Image under Harsh Lighting Conditions (2008)
Yang Wang, Zicheng Liu, Zhengyou Zhang, Dimitris Samaras
In this paper, we present a new method to change the illumination condition of a face image, with unknown face geometry and albedo information. This problem is particularly difficult when there is...
Abstract VISUAL PANEL: Toward A Vision-Based Mobile Input Interface For Anywhere (2008)
Ying Wu, Ying Shan, Zhengyou Zhang, Steven Shafer
In many intelligent environments, people are looking for an intuitive, immersive and cost-efficient interaction device, instead of using conventional mice and keyboards. This paper presents a...
Singular value decomposition Pseudoinverse (2008)
Slides Richard Szeliski, Steve Seitz, Zhengyou Zhang, Marc Pollefyes, Factorization Methods
– Projective with missing data
Cloning your own face with a desktop camera (2008)
Zhengyou Zhang, Zicheng Liu, Denis Adler, Michael Cohen, Erik Hanson, Ying Shan
Abstract: We have developed an easy and cost-effective system that constructs textured 3D animated face models from videos with minimal user interaction. Our system first takes, with an ordinary...
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...
ENERGY-BASED POSITION ESTIMATION OF MICROPHONES AND SPEAKERS FOR AD HOC MICROPHONE ARRAYS (2008)
Minghua Chen, Zicheng Liu, Li-wei He, Phil Chou, Zhengyou Zhang
We present a novel energy-based algorithm to estimate the positions of microphones and speakers in an ad hoc microphone array setting. Compared to traditional time-of-flight based approaches,...
EXPLORING DISCRIMINATIVE LEARNING FOR TEXT-INDEPENDENT SPEAKER RECOGNITION (2008)
Ming Liu, Zhengyou Zhang, Mark Hasegawa-johnson, Thomas S. Huang
Speaker verification is a technology of verifying the claimed identity of a speaker based on the speech signal from the speaker (voice print). To learn the score of similarity between each pair of...
Iterative Point Matching for Registration of Free-Form Curves (2008)
Unite De Recherche, Inria-sophia Antipolis, Et En Automatique, Sophia Antipolis, Zhengyou Zhang, Zhengyou Zhang
Une methode iterative basee sur la mise en correspondance de points pour recaler des courbes de forme generale
Zicheng Liu, Senior Member, Michael Cohen, Senior Member, Deepti Bhatnagar, Ross Cutler, ...
Abstract — In a video conferencing setting, people often use an elongated meeting table with the major axis along the camera direction. A standard wide angle perspective image of this setting...
AUTOMATIC BUSINESS CARD SCANNING WITH A CAMERA (2008)
Gang Hua, Zicheng Liu, Zhengyou Zhang, Ying Wu
In this paper, we present a system to automatically extract, rectify and enhance business card images. First the business card image patch is automatically segmented by minimizing a novel...
Head-Size Equalization for Improved Visual Perception in Video Conferencing (2008)
Zicheng Liu, Senior Member, Michael Cohen, Senior Member, Deepti Bhatnagar, Ross Cutler, ...
Abstract—In a video conferencing setting, people often use an elongated meeting table with the major axis along the camera direction. A standard wide-angle perspective image of this setting creates...
Face Re-Lighting from a Single Image under Harsh Lighting Conditions (2008)
Yang Wang, Zicheng Liu, Zhengyou Zhang, Dimitris Samaras
In this paper, we present a new method to change the illumination condition of a face image, with unknown face geometry and albedo information. This problem is particularly difficult when there is...
A COMPACT MULTI-SENSOR HEADSET FOR HANDS-FREE COMMUNICATION (2008)
Zicheng Liu, Michael L. Seltzer, Alex Acero, Ivan Tashev, Zhengyou Zhang, Mike Sinclair
The need for hands-free communication has led to an increased popularity in the use of headsets with mobile phones. Comfort and portability concerns have led to the desire for headsets with a small...
Iterative Point Matching for Registration of Free-Form Curves (2007)
Unite De Recherche, Inria-sophia Antipolis, Et En Automatique, Sophia Antipolis, Zhengyou Zhang, Zhengyou Zhang
Une methode iterative basee sur la mise en correspondance de points pour recaler des courbes de forme generale
A whiteboard can be an easy tool for collaboration such as brainstorming, and is widely used, but the content on a whiteboard is hard to archive and share. While digital cameras can be used to...
Energy-based sound source localization and gain normalization for ad hoc microphone arrays (2007)
Zicheng Liu, Zhengyou Zhang, Li-wei He, Phil Chou
We present an energy-based technique to estimate both microphone and speaker/talker locations from an ad hoc network of microphones. An example of such ad hoc microphone network is a set of...
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...
Maximum likelihood sound source localization for multiple directional microphones (2007)
Cha Zhang, Dinei Florêncio, Senior Member, Demba E. Ba, Zhengyou Zhang
Abstract—In distributed meeting applications, microphone arrays have been widely used to capture superior speech sound and perform speaker localization through sound source localization (SSL) and...
SUMBMISSION TO TPAMI: OOI EXTRACTION BY LOCAL-GLOBAL ENERGY MINIMIZATION 1 Iterative (2006)
local-global energy minimization for automatic extraction of objects of interest
Automatic head-size equalization in panorama images for video conferencing (2005)
Ya Chang, Ross Cutler, Zicheng Liu, Zhengyou Zhang, Alex Acero, Matthew Turk
In panorama images captured by omni-directional cameras during video conferencing, the image sizes of the people around the conference table are not uniform due to the varying distances to the...
Leakage Model and Teeth Clack removal for Air-and-Bone conductive microphones (2005)
Zicheng Liu, Amar Subramanya, Zhengyou Zhang, Alex Acero
Continuing our previous work [1, 2] on using air- and bone-conductive integrated microphones, and in particular on using the direct filtering approach [3] for speech enhancement in noisy...
Automatic head-size equalization in panorama images for video conferencing (2005)
Ya Chang, Ya Chang, Ross Cutler, Ross Cutler, Zicheng Liu, Zicheng Liu, ...
In panorama images captured by omni-directional cameras during video conferencing, the image sizes of the people around the conference table are not uniform due to the varying distances to the...
Multi-sensory microphones for robust speech detection, enhancement and recognition (2004)
Zhengyou Zhang, Zicheng Liu, Mike Sinclair, Alex Acero, Li Deng, Xuedong Huang, ...
In this paper, we present new hardware prototypes that integrate several heterogeneous sensors into a single headset and describe the underlying DSP techniques for robust speech detection,...
This paper describes our recently developed system which captures pen strokes on whiteboards in real time using an off-the-shelf video camera. Unlike many existing tools, our system does not...
Direct filtering for air- and bone-conductive microphones (2004)
Zicheng Liu, Zhengyou Zhang, Alex Acero, Xuedong Huang
Abstract—Air- and bone-conductive integrated microphones have been introduced by the authors [5,4] for speech enhancement in noisy environments. In this paper, we present a novel technique, called...
Li Deng, Zicheng Liu, Zhengyou Zhang, Alex Acero
One well-known difficulty in creating effective human-machine interface via the speech input is the adverse effects of concurrent acoustic noise. To overcome this challenge, we have developed a joint...
Air- and bone-conductive integrated microphones for robust speech detection and enhancement (2003)
Yanli Zheng, Zicheng Liu, Zhengyou Zhang, Mike Sinclair, Li Deng, Alex Acero, ...
We present a novel hardware device that combines a regular microphone with a bone-conductive microphone. The device looks like a regular headset and it can be plugged into any machine with a USB...
Air- and bone-conductive integrated microphones for robust speech detection and enhancement (2003)
Yanli Zheng, Zicheng Liu, Zhengyou Zhang, Mike Sinclair, Li Deng, Alex Acero, ...
We present a novel hardware device that combines a regular microphone with a bone-conductive microphone. The device looks like a regular headset and it can be plugged into any machine with a USB...
Vision-based Interaction with Fingers and Papers (2003)
This paper presents two vision-based interface systems. The first, Visual Screen, uses an inexpensive technique to transform an ordinary screen into a touch screen using an ordinary camera. The setup...
Notetaking with a Camera: Whiteboard Scanning and Image Enhancement, Microsoft Research (2003)
This paper describes a system for scanning the content on a whiteboard into the computer by a digital camera and also for enhancing the visual quality of whiteboard images. Because digital cameras...
Whiteboard Scanning and Image Enhancement (2003)
A whiteboard can be an easy tool for collaboration such as brainstorming, and is widely used, but the content on a whiteboard is hard to archive and share. While digital cameras can be used to...
Distributed meetings: A meeting capture and broadcasting system (2002)
Ross Cutler, Yong Rui, Anoop Gupta, Jj Cadiz, Ivan Tashev, Li-wei He, ...
The common meeting is an integral part of everyday life for most workgroups. However, due to travel, time, or other constraints, people are often not able to attend all the meetings they need to....
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...
Ryo Kurazume, Ko Nishino, Zhengyou Zhang, Katsushi Ikeuchi
Texture mapping on scanned objects, that is, the method to map current color images on a 3D geometric model measured by a range sensor, is a key technique of photometric modeling for virtual reality....
Camera Calibration with One-Dimensional Objects (2002)
This paper yet proposes a new calibration technique using 1D objects (points aligned on a line), thus lling the missing dimension in calibration. In particular, we show that camera calibration is not...
Why take notes? use the whiteboard capture system (2002)
Li-wei He, Zicheng Liu, Zhengyou Zhang
This paper describes our recently developed system which captures both whiteboard content and audio signals of a meeting using a digital still camera and a microphone. Our system can be retrofit to...
Distributed meetings: A meeting capture and broadcasting system (2002)
Ross Cutler, Yong Rui, Anoop Gupta, Jj Cadiz, Ivan Tashev, Li-wei He, ...
The common meeting is an integral part of everyday life for most workgroups. However, due to travel, time, or other constraints, people are often not able to attend all the meetings they need to....
Why take notes? use the whiteboard capture system (2002)
Li-wei He, Zicheng Liu, Zhengyou Zhang
This paper describes our recently developed system which captures both whiteboard content and audio signals of a meeting using a digital still camera and a microphone. Our system can be retrofit to...
2.2 Setups With Free-Moving 1D Calibration Objects...................... 3 (2002)
Camera calibration has been studied extensively in computer vision and photogrammetry, and the proposed techniques in the literature include those using 3D apparatus (two or three planes orthogonal...
A Developing Sensory Mapping for Robots (2002)
Nan Zhang And, Nan Zhang, John Weng, Zhengyou Zhang
A sensory mapping method, called "Staggered Hierarchical Mapping (SHM)," and its developmental algorithm are described in this paper. SHM is a model motivated by human early visual pathways...
Whiteboard It! Convert Whiteboard Content into an Electronic Document (2002)
This ongoing project aims at converting the content on a physical whiteboard, captured by a digital camera, into an electronic document which can be easily manipulated as drawings in a MS Office...
Why Take Notes? Use the Whiteboard Capture System (2002)
Li-wei He, Zicheng Liu, Zhengyou Zhang
This paper describes our recently developed system which captures both whiteboard content and audio signals of a meeting using a digital still camera and a microphone. Our system can be retrofit to...
Visual Panel: Virtual Mouse Keyboard and 3D Controller with an Ordinary Piece of Paper (2001)
This paper presents a vision-based interface system, VISUAL PANEL, which employs an arbitrary quadrangle-shaped panel (e.g., an ordinary piece of paper) and a tip pointer (e.g., fingertip) as an...
A progressive scheme for stereo matching (2001)
Brute-force dense matching is usually not satisfactory because the same search range is used for the entire image, yielding potentially many false matches. In this paper, we propose a progressive...
Visual Panel: Virtual Mouse Keyboard and 3D Controller with an Ordinary Piece of Paper (2001)
This paper presents a vision-based interface system, VISUAL PANEL, which employs an arbitrary quadrangle-shaped panel (e.g., an ordinary piece of paper) and a tip pointer (e.g., fingertip) as an...
Ko Nishino, Zhengyou Zhang, Katsushi Ikeuchi
A framework for photo-realistic view-dependent image synthesis of a shiny object from a sparse set of images and a geometric model is proposed. Each image is aligned with the 3D model and decomposed...
Estimating the fundamental matrix by transforming image points in projective space (2001)
This paper proposes a novel technique for estimating the fundamental matrix by transforming the image points in projective space. We therefore only need to perform nonlinear optimization with one...
Model-based bundle adjustment with application to face modeling (2001)
Ying Shan, Zicheng Liu, Zhengyou Zhang
We present a new model-based bundle adjustment algorithm to recover the 3D model of a scene/object from a sequence of images with unknown motions. Instead of representing scene/object by a collection...
Image-based Modeling of Objects and Human Faces (2001)
In this paper, I will provide an overview of our project on 3D object and face modeling from images taken by a free-moving camera. We strive to advance the state of the art in 3D computer vision, and...
Image-Based Surface Detail Transfer (2001)
Ying Shan Zicheng, Ying Shan, Zicheng Liu, Zhengyou Zhang
We present a novel technique, called Image-Based Surface Detail Transfer, to transfer geometric details from one surface to another with simple 2D image operations. The basic observation is that,...
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...
Ko Nishino, Zhengyou Zhang, Katsushi Ikeuchi
A framework for photo-realistic view-dependent image synthesis of a shiny object from a sparse set of images and a geometric model is proposed. Each image is aligned with the 3D model and decomposed...
Robust Head Motion Computation by Taking Advantage of Physical Properties (2000)
We present a new algorithm to compute the head motion between two views from the correspondences of five feature points (eye corners, mouth corners, and nose top), and zero or more other image point...
Robust Head Motion Computation by Taking Advantage of Physical Properties (2000)
Head motion determination is an important problem for many applications including face modeling and tracking. We present a new algorithm to compute the head motion between two views from the...
Rapid Modeling of Animated Faces From Video (2000)
Zhengyou Zhang, Zicheng Liu, Zhengyou Zhang, Zhengyou Zhang, Chuck Jacobs, Chuck Jacobs, ...
Generating realistic 3D human face models and facial animations has been a persistent challenge in computer graphics. We have developed a system that constructs textured 3D face models from videos...
Visual Screen: Transforming an ordinary screen into a touch screen (2000)
Touch screens are very convenient because one can directly point to where it is interesting. This paper presents an inexpensive technique to transform an ordinary screen into a touch screen using an...
Computing Rectifying Homographies for Stereo Vision (1999)
Charles Loop Zhengyou, Charles Loop, Zhengyou Zhang
Image rectification is the process of applying a pair of 2 dimensional projective transforms, or homographies, to a pair of images whose epipolar geometry is known so that epipolar lines in the...
Computing Rectifying Homographies for Stereo Vision (1999)
Image rectification is the process of applying a pair of 2 dimensional projective transforms, or homographies, to a pair of images whose epipolar geometry is known so that epipolar lines in the...
Computing rectifying homographies for stereo vision (1999)
c1999 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale...
Zhengyou Zhang, Zhengyou Zhang
and Gabor-wavelets-based facial expression recognition uaing multi-layer perceptron”,
Flexible camera calibration by viewing a plane from unknown orientations (1999)
We propose a flexible new technique to easily calibrate a camera. It only requires the camera to observe a planar pattern shown at a few (at least two) different orientations. Either the camera or...
Feature-Based Facial Expression Recognition: Experiments With a Multi-Layer Perceptron (1998)
In this paper, we report our experiments on feature-based facial expression recognition within an architecture based on a two-layer perceptron. We investigate the use of two types of features...
Feature-Based Facial Expression Recognition: Experiments With a Multi-Layer Perceptron (1998)
In this paper, we report our experiments on feature-based facial expression recognition within an architecture based on a two-layer perceptron. We investigate the use of two types of features...
Feature-Based Facial Expression Recognition: Experiments With a Multi-Layer Perceptron (1998)
In this paper, we report our experiments on feature-based facial expression recognition within an architecture based on a two-layer perceptron. We investigate the use of two types of features...
Zhengyou Zhang, Michael Lyons, Michael Schuster, Shigeru Akamatsu
In this paper, we investigate the use of two types of features extracted from face images for recognizing facial expressions. The first type is the geometric positions of a set of fiducial points on...
Determining the epipolar geometry and its uncertainty: A review (1998)
Abstract. Two images of a single scene/object are related by the epipolar geometry, which can be described by a 3x3 singular matrix called the essential matrix if images ’ internal parameters are...
Modeling Geometric Structure and Illumination Variation of a Scene from Real Images (1998)
We present in this paper a system which automatically builds, from real images, a scene model containing both 3D geometric information of the scene structure and its photometric information under...
A Flexible New Technique for Camera Calibration (1998)
Zhengyou Zhang, Zhengyou Zhang
We propose a flexible new technique to easily calibrate a camera. It is well suited for use without specialized knowledge of 3D geometry or computer vision. The technique only requires the camera to...
Zhengyou Zhang, Katsunori Isono, Shigeru Akamatsu
Use of uncalibrated images has found many applications such as image synthesis. However, it is not easy to specify the desired position of the new image in projective or affine space. This paper...
Understanding the Relationship Between the Optimization Criteria in Two-View Motion Analysis (1998)
The three best known criteria in two-view motion analysis are based, respectively, on the distances between points and their corresponding epipolar lines, on the gradientweighted epipolar errors, and...
Image-Based Geometrically-Correct Photorealistic Scene/Object Modeling (IBPhM): A Review (1998)
. There are emerging interests from both computer vision and computer graphics communities in obtaining photorealistic modeling of a scene or an object from real images. This paper presents a...
Image-based geometrically-correct photorealistic scene/object modeling (ibphm): A review (1998)
Abstract. There are emerging interests from both computer vision and computer graphics communities in obtaining photorealistic modeling of a scene or an object from real images. This paper presents a...
Modeling geometric structure and illumination variation of a scene from real images (1998)
We present in this paper a system which automatically builds, from real images, a scene model containing both 3D geometric information of the scene structure and its photometric information under...
Zhengyou Zhang, Olivier Faugeras, Rachid Deriche
this article has been developed as part of a perception system for applications of planetary intervention, although the technique itself can be used in other applications. A correlationbased...
Parameter Estimation Techniques: A Tutorial with Application to Conic Fitting (1997)
Zhengyou Zhang, Zhengyou Zhang, Programme Robotique, Projet Robotvis
: Almost all problems in computer vision are related in one form or another to the problem of estimating parameters from noisy data. In this tutorial, we present what is probably the most commonly...
A General Expression of the Fundamental Matrix for Both Perspective and Affine Cameras (1997)
This paper addresses the recovery of structure and motion from two uncalibrated images of a scene under full perspective or under affine projection. Epipolar geometry, projective reconstruction, and...
A Unified Theory of Uncalibrated Stereo for Both Perspective and Affine Cameras (1997)
This paper addresses the recovery of structure and motion from uncalibrated images of a scene under full perspective or under affine projection. Particular emphasis is placed on the configuration of...
Parameter Estimation Techniques: A Tutorial with Application to Conic Fitting (1997)
Zhengyou Zhang, Zhengyou Zhang, Projet Robotvis
Almost all problems in computer vision are related in one form or an other to the problem of estimating parameters from noisy data. In this tutorial, we present what is probably the most commonly...
Self-Maintaining Camera Calibration Over Time (1997)
The success of an intelligent robotic system depends on the performance of its vision-system which in turn depends to a great extend upon the quality of its calibration. During the execution of a...
The standard approach consists of two stages: (i) using the 8-point algorithm to estimate the 9 essential parameters defined up to a scale factor; (ii) refining the motion estimation based on some...
Determining the Epipolar Geometry and its Uncertainty: A Review (1996)
Two images of a single scene/object are related by the epipolar geometry, which can be described by a 3x3 singular matrix called the essential matrix if images' internal parameters are known, or the...
The classical approach to motion and structure estimation problem from two perspective projections consists of two stages: (i) using the 8-point algorithm to estimate the 9 essential parameters...
Determining the Epipolar Geometry and its Uncertainty: A Review (1996)
Two images of a single scene/object are related by the epipolar geometry, which can be described by a 3x3 singular matrix called the essential matrix if images' internal parameters are known, or the...
The classical approach to motion and structure estimation problem from two perspective projections consists of two stages: (i) using the 8-point algorithm to estimate the 9 essential parameters...
Determining the Epipolar Geometry and its Uncertainty: A Review (1996)
Two images of a single scene/object are related by the epipolar geometry, which can be described by a 3x3 singular matrix called the essential matrix if images' internal parameters are known, or the...
The classical approach to motion and structure estimation problem from two perspective projections consists of two stages: (i) using the 8-point algorithm to estimate the 9 essential parameters...
Zhengyou Zhang, Zhengyou Zhang, Projet Robotvis
apport de recherche
This paper describes a complete stereovision system, which was originally developed for planetary applications, but can be used for other applications such as object modeling. A new effective on-site...
Determining the Epipolar Geometry and its Uncertainty: A Review (1996)
Two images of a single scene/object are related by the epipolar geometry, which can be described by a 3×3 singular matrix called the essential matrix if images' internal parameters are...
Determining the Epipolar Geometry and its Uncertainty: A Review (1996)
Zhengyou Zhang, Zhengyou Zhang, Projet Robotvis
Two images of a single scene/object are related by the epipolar geometry, which can be described by a 3×3 singular matrix called the essential matrix if images' internal parameters are...
Zhengyou Zhang, Zhengyou Zhang, Projet Robotvis
The classical approach to motion and structure estimation problem from two perspective projections consists of two stages: (i) using the 8-point algorithm to estimate the 9 essential parameters...
On the Epipolar Geometry Between Two Images With Lens Distortion (1996)
In order to achieve a 3D, either Euclidean or projective, reconstruction with high precision, one has to consider lens distortion. In almost all work on multiple-views problems in computer vision, a...
Real Time Correlation-Based Stereo: Algorithm, Implementations and Applications (1996)
Olivier Faugeras, Bernard Hotz, Hervé Mathieu, Thierry Viéville, Zhengyou Zhang, Pascal Fua, ...
This paper describes some of the work on stereo that has been going on at INRIA in the last four years. The work has concentrated on obtaining dense, accurate, and reliable range maps of the...
Parameter Estimation Techniques: A Tutorial with Application to Conic Fitting (1995)
Almost all problems in computer vision are related in one form or another to the problem of estimating parameters from noisy data. In this tutorial, we present what is probably the most commonly used...
Characterizing the Uncertainty of the Fundamental Matrix (1995)
Faugeras, Olivier, Zhang, Zhengyou, Zeller, Cyril, Csurka, Gabriella
This paper deals with the analysis of the uncertainty of the fundamental matrix. The basic idea is to compute the fundamental matrix and its uncertainty in the same time. We shall show two different...
Parameter Estimation Techniques: A Tutorial with Application to Conic Fitting (1995)
Almost all problems in computer vision are related in one form or another to the problem of estimating parameters from noisy data. In this tutorial, we present what is probably the most commonly used...
Characterizing the Uncertainty of the Fundamental Matrix (1995)
Faugeras, Olivier, Zhang, Zhengyou, Zeller, Cyril, Csurka, Gabriella
This paper deals with the analysis of the uncertainty of the fundamental matrix. The basic idea is to compute the fundamental matrix and its uncertainty in the same time. We shall show two different...
Parameter Estimation Techniques: A Tutorial with Application to Conic Fitting (1995)
Almost all problems in computer vision are related in one form or another to the problem of estimating parameters from noisy data. In this tutorial, we present what is probably the most commonly used...
Characterizing the Uncertainty of the Fundamental Matrix (1995)
Faugeras, Olivier, Zhang, Zhengyou, Zeller, Cyril, Csurka, Gabriella
This paper deals with the analysis of the uncertainty of the fundamental matrix. The basic idea is to compute the fundamental matrix and its uncertainty in the same time. We shall show two different...
We describe an analytical method for recovering 3D motion and structure of four or more points from one motion of a stereo rig. The extrinsic parameters are unknown. The motion of the stereo rig is...
Zhengyou Zhang, Zhengyou Zhang, Programme Robotique, Projet Robotvis
We present in this paper an algorithm for determining 3D motion and structure from correspondences of line segments between two perspective images. To our knowledge, this paper is the first...
Characterizing the Uncertainty of the Fundamental Matrix (1995)
Gabriella Csurka, Gabriella Csurka, Cyril Zeller, Cyril Zeller, Zhengyou Zhang, Zhengyou Zhang, ...
This paper deals with the analysis of the uncertainty of the fundamental matrix. The basic idea is to compute the fundamental matrix and its uncertainty in the same time. We shall show two different...
We present in this paper an algorithm for determining 3D motion and structure from correspondences of line segments between two perspective images. To our knowledge, this paper is the first...
Zhengyou Zhang, Olivier Faugeras, Rachid Deriche
We present a novel technique for calibrating a binocular stereo rig by using the information from both scenes and classical calibration objects. The calibration provided by the calssical methods is...
Characterizing the Uncertainty of the Fundamental Matrix (1995)
Gabriella Csurka, Cyril Zeller, Zhengyou Zhang, Olivier D. Faugeras
This paper deals with the analysis of the uncertainty of the fundamental matrix. The basic idea is to compute the fundamental matrix and its uncertainty at the same time. We give two different...
Zhengyou Zhang, Zhengyou Zhang, Rachid Deriche, Rachid Deriche, Olivier Faugeras, Olivier Faugeras, ...
Robotique, image et vision apport de recherche
We present in this paper an algorithm for determining 3D motion and structure from correspondences of nline segments between two perspective images. To our knowledge, this paper is the first...
We present in this paper an algorithm for determining 3D motion and structure from correspondences of nline segments between two perspective images. To our knowledge, this paper is the first...
Zhang, Zhengyou, Deriche, Rachid, Faugeras, Olivier, Luong, Quang-Tuan
Disponible dans les fichiers attachés à ce document
We present in this paper an algorithm for determining 3D motion and structure from correspondences of nline segments between two perspective images. To our knowledge, this paper is the first...
Zhang, Zhengyou, Deriche, Rachid, Faugeras, Olivier, Luong, Quang-Tuan
Disponible dans les fichiers attachés à ce document
Le Probleme de la mise en correspondance : l'etat de l'art (1993)
Le probleme de la mise en correspondance est l'un des problemes les plus difficiles en vision par ordinateur. Nous identifions trois categories de mise en correspondance : stereovision,...
Real-time correlation-based stereo : algorithm, implementations and applications (1993)
Faugeras, Olivier, Vieville, Thierry, Theron, E., Vuillemin, J., Hotz, B., Zhang, Zhengyou, ...
This paper describes some of the work on stereo that has been going on at INRIA in the last four years. The work has concentrated on obtaining dense, accurate and reliable range maps of the...
A Stereovision-based navigation system for a mobile robot (1993)
Buffa, M., Faugeras, Olivier, Zhang, Zhengyou
This report describes the work at INRIA on obstacle avoidance and trajectory planning for a mobile robot using stereovision. Our mobile robot is equipped with a trinocular vision system that has been...
Le Probleme de la mise en correspondance : l'etat de l'art (1993)
Le probleme de la mise en correspondance est l'un des problemes les plus difficiles en vision par ordinateur. Nous identifions trois categories de mise en correspondance : stereovision,...
Motion of an uncalibrated stereo rig : self-calibration and metric reconstruction (1993)
Zhang, Zhengyou, Luong, Quang-Tuan, Faugeras, Olivier
Disponible dans les fichiers attachés à ce document
Real-time correlation-based stereo : algorithm, implementations and applications (1993)
Faugeras, Olivier, Vieville, Thierry, Theron, Eric, Vuillemin, Jean, Hotz, Bernard, Zhang, Zhengyou, ...
This paper describes some of the work on stereo that has been going on at INRIA in the last four years. The work has concentrated on obtaining dense, accurate and reliable range maps of the...
A Stereovision-based navigation system for a mobile robot (1993)
Buffa, Michel, Faugeras, Olivier, Zhang, Zhengyou
This report describes the work at INRIA on obstacle avoidance and trajectory planning for a mobile robot using stereovision. Our mobile robot is equipped with a trinocular vision system that has been...
Le Probleme de la mise en correspondance : l'etat de l'art (1993)
Le probleme de la mise en correspondance est l'un des problemes les plus difficiles en vision par ordinateur. Nous identifions trois categories de mise en correspondance : stereovision,...
Motion of an uncalibrated stereo rig : self-calibration and metric reconstruction (1993)
Zhang, Zhengyou, Luong, Quang-Tuan, Faugeras, Olivier
Disponible dans les fichiers attachés à ce document
Real-time correlation-based stereo : algorithm, implementations and applications (1993)
Faugeras, Olivier, Vieville, Thierry, Theron, Eric, Vuillemin, Jean, Hotz, Bernard, Zhang, Zhengyou, ...
This paper describes some of the work on stereo that has been going on at INRIA in the last four years. The work has concentrated on obtaining dense, accurate and reliable range maps of the...
A Stereovision-based navigation system for a mobile robot (1993)
Buffa, Michel, Faugeras, Olivier, Zhang, Zhengyou
This report describes the work at INRIA on obstacle avoidance and trajectory planning for a mobile robot using stereovision. Our mobile robot is equipped with a trinocular vision system that has been...
1 - Recalage de deux nuages de points 3D (1993)
A method has been developed for registering two dense 3-D maps obtained by using a correlation-based stereo system . Geometric matching in general is a difficult unsolved problem in computer vision ....
1 - Recalage de deux nuages de points 3D (1993)
A method has been developed for registering two dense 3-D maps obtained by using a correlation-based stereo system . Geometric matching in general is a difficult unsolved problem in computer vision ....
Motion of an Uncalibrated Stereo Rig: Self-Calibration and Metric Reconstruction (1993)
Zhengyou Zhang, Zhengyou Zhang, Quang-tuan Luong, Quang-tuan Luong, Olivier Faugeras, Olivier Faugeras, ...
We address in this paper the problem of self-calibration and metric reconstruction (up to a scale) from one unknown motion of an uncalibrated stereo rig, assuming the coordinates of the principal...
Token Tracking in a Cluttered Scene (1993)
Zhengyou Zhang, Zhengyou Zhang, Programme Robotique, Projet Robotvis
The statistical data association technique is an important approach to analyze long sequences of images in Computer Vision. Although it has extensively been studied in other domains such as in radar...
A Stereovision-Based Navigation System for a Mobile Robot (1993)
E De Recherche, Route Des Lucioles, Olivier Faugeras, Michel Buffa, Michel Buffa, Olivier D. Faugeras, ...
This report describes the work at INRIA on obstacle avoidance and trajectory planning for a mobile robot using stereovision. Our mobile robot is equipped with a trinocular vision system that has been...
Iterative point matching for registration of free-form curves (1992)
Geometric matching in general is a difficult unsolved problem in computer vision. Fortunately, in many pratical applications, some a priori knowledge exists which considerably simplifies the problem....
Iterative point matching for registration of free-form curves (1992)
Geometric matching in general is a difficult unsolved problem in computer vision. Fortunately, in many pratical applications, some a priori knowledge exists which considerably simplifies the problem....
Iterative point matching for registration of free-form curves (1992)
Geometric matching in general is a difficult unsolved problem in computer vision. Fortunately, in many pratical applications, some a priori knowledge exists which considerably simplifies the problem....
Iterative Point Matching for Registration of Free-form Curves (1992)
Une m'ethode it'erative bas'ee sur la mise en correspondance de points pour recaler des courbes de forme g'en'erale
Michel Buffa, Michel Buoea, Olivier D. Faugeras, Zhengyou Zhang
This article describes the work at INRIA on obstacle avoidance and trajectory planning for a mobile robot using stereovision. Our mobile robot is equipped with a trinocular vision system which is...
A 3D world model builder with a mobile robot (1991)
Zhang, Zhengyou, Faugeras, Olivier
Disponible dans les fichiers attachés à ce document
Zhang, Zhengyou, Faugeras, Olivier
Disponible dans les fichiers attachés à ce document
Estimation of displacements from two frames obtained from stereo (1991)
Zhang, Zhengyou, Faugeras, Olivier
Disponible dans les fichiers attachés à ce document
A 3D world model builder with a mobile robot (1991)
Zhang, Zhengyou, Faugeras, Olivier
Disponible dans les fichiers attachés à ce document
Zhang, Zhengyou, Faugeras, Olivier
Disponible dans les fichiers attachés à ce document
Estimation of displacements from two frames obtained from stereo (1991)
Zhang, Zhengyou, Faugeras, Olivier
Disponible dans les fichiers attachés à ce document
. The standard 2-stage algorithm first estimates the 9 essential parameters defined up to a scale factor and then refines the motion estimation based on some statistically optimal criteria. We...
Zhengyou Zhang, Michael Lyons, Michael Schuster, Shigeru Akamatsu
In this paper, we investigate the use of two types of features extracted from face images for recognizing facial expressions. The first type is the geometric positions of a set of fiducial points on...