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...
We first present our studies on how clock synchronization errors affect the performance of sound source separation with a distributed microphone array. We show that our previouslyproposed...
A Deformable Local Image Descriptor (2009)
Hong Cheng, Zicheng Liu, Nanning Zheng, Jie Yang
This paper presents a novel local image descriptor that is robust to general image deformations. A limitation with traditional image descriptors is that they use a single support region for each...
Geometry-driven photorealistic facial expression synthesis (2009)
Qingshan Zhang, Zicheng Liu, Senior Member, Baining Guo, Senior Member, Demetri Terzopoulos, ...
Abstract—Expression mapping (also called performance driven animation) has been a popular method for generating facial animations. A shortcoming of this method is that it does not generate...
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...
Yong Rui, Zicheng Liu, Yong Rui, Zicheg Liu
Web services designed for human users are being abused by computer programs (bots). The bots steal thousands of free email accounts in a minute; participate in online polls to skew results; and...
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...
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, 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,...
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...
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...
Characters or Faces: A User Study on Ease of Use for HIPs (2008)
Yong Rui, Zicheng Liu, Shannon Kallin, Gavin Janke, Cem Paya
Abstract. Web-based services designed for human users are being abused by computer programs (bots). This real-world issue has recently generated a new research area called Human Interactive Proofs...
Characters or Faces: A User Study on Ease of Use for HIPs (2008)
Yong Rui, Zicheng Liu, Shannon Kallin, Gavin Janke, Cem Paya
Web-based services designed for human users are being abused by computer programs (bots). This real-world issue has recently generated a new research area called Human Interactive Proofs (HIP), whose...
Real-Time Warps for Improved Wide-Angle Viewing”, MSR (2008)
Abstract. Providing wide angle views is often advantageous to provide context, such as in video conferencing, or when viewing panoramic imagery. Unfortunately, wide angle images often appear...
Mingli Song, Zhao Dong, Student Member, Christian Theobalt, Huiqiong Wang, Zicheng Liu, ...
Abstract — Facial expression analogy provides computer animation professionals with a tool to map expressions of an arbitrary source face onto an arbitrary target face. In the recent past, several...
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,...
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...
Qingshan Zhang, Zicheng Liu, Baining Guo, Harry Shum
Expression mapping (also called performance driven animation) has been a popular method to generate facial animations. One shortcoming of this method is that it does not generate expression details...
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. Web services designed for human users are being abused by computer programs (bots). The bots steal thousands of free e-mail accounts in a minute, participate in online polls to skew...
Zicheng Liu, Steven J. Gortler, Michael F. Cohen
Specifying the motion of an animated linked figure such that it achieves given tasks (e.g., throwing a ball into a basket) and performs the tasks in a realistic fashion (e.g., gracefully, and...
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...
The Bounded Membership Problem of the Monoid (2007)
SL 2 (N ) is the set of all 2 \Theta 2 matrices with nonnegative integer entries and determinant 1. The bounded membership problem BMN of SL 2 (N ) is that given a subset S of SL 2 (N ), a matrix A 2...
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...
A General Framework for Efficient 2D and 3D Facial Expression Analogy (2007)
Song, Mingli, Dong, Zhao, Theobalt, Christian, Wang, Huiqiong, Liu, Zicheng, Seidel, Hans-Peter
Facial expression analogy provides computer animation professionals with a tool to map expressions of an arbitrary source face onto an arbitrary target face. In the recent past, several algorithms...
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,...
Low Bit-Rate Video Streaming For Face-To-Face Teleconference (2004)
Zhen Wen, Zicheng Liu, Michael Cohen, Jin Li, Ke Zheng, Tomas Huang
Face-to-face video teleconferencing is very important for real time communication. Current teleconferencing application uses standard video codec, such as MPEG1/2/4, for the compression of face...
Low Bit-Rate Video Streaming For Face-To-Face Teleconference (2004)
Zhen Wen, Zicheng Liu, Michael Cohen, Jin Li, Ke Zheng, Tomas Huang
Face-to-face video teleconferencing is very important for real time communication. Current teleconferencing application uses standard video codec, such as MPEG1/2/4, for the compression of face...
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...
Face relighting with radiance environment maps (2003)
Zhen Wen, Zicheng Liu, Thomas S. Huang
A radiance environment map pre-integrates a constant surface reflectance with the lighting environment. It has been used to generate photo-realistic rendering at interactive speed. However, one of...
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...
Geometry-driven photorealistic facial expression synthesis (2003)
Qingshan Zhang, Zicheng Liu, Baining Guo, Demetri Terzopoulos, Heung-yeung Shum, Senior Member, ...
Abstract—Expression mapping (also called performance driven animation) has been a popular method for generating facial animations. A shortcoming of this method is that it does not generate...
ARTiFACIAL: Automated Reverse Turing Test Using FACIAL Features (2003)
Abstract. Web services designed for human users are being abused by computer programs (bots). The bots steal thousands of free email accounts in a minute; participate in online polls to skew results;...
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...
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...
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...
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 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,...
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...
Efficient Animation Techniques Balancing Both User Control And Physical Realism (1996)
Specifying the motion of an animated linked figure such that it achieves given tasks (e.g., throwing a ball into a basket) and performing the tasks in a realistic fashion (e.g., gracefully, and...
Keyframe motion optimization by relaxing speed and timing (1995)
Zicheng Liu, Zicheng Liu, Michael F. Cohen, Michael F. Cohen
Abstract. While physically based approaches have been shown to be effective for creating graceful and realistic motions, keyframing systems are still the predominant tool for animation. This is due...
An efficient symbolic interface to constraint based animation systems (1995)
Zicheng Liu, Zicheng Liu, Michael F. Cohen, Michael F. Cohen
Abstract. Symbolic methods have been used to provide a general user interface in optimization based animation systems. However, previous methods suffer from the exponential growth in the length of...
F.: Hierarchical spacetime control of linked figures (1994)
Zicheng Liu, Steven J. Gortler, Michael F. Cohen
Specifying the motion of an animated linked figure such that it achieves given tasks (e.g., throwing a ball into a basket) and performs the tasks in a realistic fashion (e.g., gracefully, and...
Efficient Average-Case Algorithms for the Modular Group (1994)
Jin-yi Cai, Wolfgang H. Fuchs, Dexter Kozen, Zicheng Liu
The modular group occupies a central position in many branches of mathematical sciences. In this paper we give average polynomial-time algorithms for the unbounded and bounded membership problems for...
Hierarchical Spacetime Control (1994)
Zicheng Liu, Steven J. Gortler, Michael F. Cohen
Specifying the motion of an animated linked figure such that it achieves given tasks (e.g., throwing a ball into a basket) and performs the tasks in a realistic fashion (e.g., gracefully, and...
Efficient Average-Case Algorithms for the Modular Group (1994)
Jin-yi Cai, Wolfgang H. Fuchs, Dexter Kozen, Zicheng Liu
The modular group occupies a central position in many branches of mathematical sciences. In this paper we give average polynomial-time algorithms for the unbounded and bounded membership problems for...
Decomposition of linked figure motion: Diving (1994)
Abstract We present simplified techniques to simulate and control complex motions. The spacetime constraint paradigm has proven successful for providing animators with control of motion without...
Decomposition of linked figure motion: Diving (1994)
We present simpli ed techniques to simulate and control complex motions. The spacetime constraint paradigm has proven successful for providing animators with control of motion without burdening them...