Search For:

Displaying 1-39 out of 39 total
Forging a Close Relationship with Multimedia Communities
Found in: IEEE MultiMedia
By Wenjun Zeng,Zicheng Liu,Eckehard Steinbach
Issue Date:October 2014
pp. 14-15
In May 2014, the authors of the top 26 papers from the IEEE International Conference on Multimedia & Expo (ICME) 2014 were invited to submit extended versions of their papers to this fast track special issue. After a rigorous peer-review process, e...
   
Efficient search of Top-K video subvolumes for multi-instance action detection
Found in: Multimedia and Expo, IEEE International Conference on
By Norberto A. Goussies, Zicheng Liu, Junsong Yuan
Issue Date:July 2010
pp. 328-333
Action detection was formulated as a subvolume mutual information maximization problem in [8], where each subvolume identifies where and when the action occurs in the video. Despite the fact that the proposed branch-and-bound algorithm can find the best su...
 
Learning Actionlet Ensemble for 3D Human Action Recognition
Found in: IEEE Transactions on Pattern Analysis and Machine Intelligence
By Jiang Wang,Zicheng Liu,Ying Wu,Junsong Yuan
Issue Date:May 2014
pp. 1-1
Human action recognition is an important yet challenging task. Human actions usually involve human-object interactions, highly articulated motions, high intra-class variations, and complicated temporal structures. The recently developed commodity depth sen...
 
Mining actionlet ensemble for action recognition with depth cameras
Found in: 2012 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)
By Jiang Wang, Zicheng Liu, Ying Wu, Junsong Yuan
Issue Date:June 2012
pp. 1290-1297
Human action recognition is an important yet challenging task. The recently developed commodity depth sensors open up new possibilities of dealing with this problem but also present some unique challenges. The depth maps captured by the depth cameras are v...
 
Real world activity summary for senior home monitoring
Found in: Multimedia and Expo, IEEE International Conference on
By Hong Cheng, Zicheng Liu, Yang Zhao, Guo Ye
Issue Date:July 2011
pp. 1-4
From a senior person's daily activities, one can tell a lot about the health condition of the senior person. Thus we believe that senior home activity analysis will play an important role in the health care of senior people. Toward this goal, we propose a ...
 
Unsupervised random forest indexing for fast action search
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Gang Yu, Junsong Yuan, Zicheng Liu
Issue Date:June 2011
pp. 865-872
Despite recent successes of searching small object in images, it remains a challenging problem to search and locate actions in crowded videos because of (1) the large variations of human actions and (2) the intensive computational cost of searching the vid...
 
Discriminative Video Pattern Search for Efficient Action Detection
Found in: IEEE Transactions on Pattern Analysis and Machine Intelligence
By Junsong Yuan, Zicheng Liu, Ying Wu
Issue Date:September 2011
pp. 1728-1743
Actions are spatiotemporal patterns. Similar to the sliding window-based object detection, action detection finds the reoccurrences of such spatiotemporal patterns through pattern matching, by handling cluttered and dynamic backgrounds and other types of a...
 
Learning feature transforms for object detection from panoramic images
Found in: Multimedia and Expo, IEEE International Conference on
By Hong Cheng, Zicheng Liu, Jie Yang
Issue Date:July 2010
pp. 643-648
We present a novel technique to detect objects from panoramic images using existing object detectors trained from perspective images. By leveraging existing object detectors, we save the cost of training a new detector which requires tedious and time consu...
 
Action detection using multiple spatial-temporal interest point features
Found in: Multimedia and Expo, IEEE International Conference on
By Liangliang Cao, YingLi Tian, Zicheng Liu, Benjamin Yao, Zhengyou Zhang, Thomas S. Huang
Issue Date:July 2010
pp. 340-345
This paper considers the problem of detecting actions from cluttered videos. Compared with the classical action recognition problem, this paper aims to estimate not only the scene category of a given video sequence, but also the spatial-temporal locations ...
 
Cross-dataset action detection
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Liangliang Cao, Zicheng Liu, Thomas S. Huang
Issue Date:June 2010
pp. 1998-2005
In recent years, many research works have been carried out to recognize human actions from video clips. To learn an effective action classifier, most of the previous approaches rely on enough training labels. When being required to recognize the action in ...
 
Discriminative subvolume search for efficient action detection
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Junsong Yuan, Zicheng Liu, Ying Wu
Issue Date:June 2009
pp. 2442-2449
Actions are spatio-temporal patterns which can be characterized by collections of spatio-temporal invariant features. Detection of actions is to find the re-occurrences (e.g. through pattern matching) of such spatio-temporal patterns. This paper addresses ...
 
Face Relighting from a Single Image under Arbitrary Unknown Lighting Conditions
Found in: IEEE Transactions on Pattern Analysis and Machine Intelligence
By Yang Wang, Lei Zhang, Zicheng Liu, Gang Hua, Zhen Wen, Zhengyou Zhang, Dimitris Samaras
Issue Date:November 2009
pp. 1968-1984
In this paper, we present a new method to modify the appearance of a face image by manipulating the illumination condition, when the face geometry and albedo information is unknown. This problem is particularly difficult when there is only a single image o...
 
Meta-tag propagation by co-training an ensemble classifier for improving image search relevance
Found in: Computer Vision and Pattern Recognition Workshop
By Aayush Sharma, Gang Hua, Zicheng Liu, Zhengyou Zhang
Issue Date:June 2008
pp. 1-6
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 image search engines to improve their search relevance. T...
 
A deformable local image descriptor
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Zicheng Liu, Jie Yang
Issue Date:June 2008
pp. 1-8
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 interest point. For general image deformations, the amount of...
 
Face Re-Lighting from a Single Image under Harsh Lighting Conditions
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Yang Wang, Zicheng Liu, Gang Hua, Zhen Wen, Zhengyou Zhang, Dimitris Samaras
Issue Date:June 2007
pp. 1-8
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 only one single image of the subject available and it was t...
 
Speech Modelingwith Magnitude-Normalized Complex Spectra and Its Application to Multisensory Speech Enhancement
Found in: Multimedia and Expo, IEEE International Conference on
By Amarnag Subramanya, Zhengyou Zhang, Zicheng Liu, Alex Acero
Issue Date:July 2006
pp. 1157-1160
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, which is based on statistical models of magnitude-normalized...
 
Automatic Head-size Equalization in Panorama Images for Video Conferencing
Found in: Multimedia and Expo, IEEE International Conference on
By Ya Chang, R. Cutler, Zicheng Liu, Zhengyou Zhang, A. Acero, M. Turk
Issue Date:July 2005
pp. 506-509
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 camera. Spatially varying-uniform (SVU) scaling functions have ...
 
Image-Based Surface Detail Transfer
Found in: IEEE Computer Graphics and Applications
By Zicheng Liu, Zhengyou Zhang, Ying Shan
Issue Date:May 2004
pp. 30-35
This article presents a novel technique, called image-based surface detail transfer, that transfers geometric details from one surface to another with simple 2D image operations. The authors? basic finding is that, without knowing its 3D geometry, geometri...
 
Face Relighting with Radiance Environment Maps
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Zhen Wen, Zicheng Liu, Thomas S. Huang
Issue Date:June 2003
pp. 158
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 its limitations is that each radiance environment map can o...
 
Image-Based Surface Detail Transfer
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Ying Shan, Zicheng Liu, Zhengyou Zhang
Issue Date:December 2001
pp. 794
We present a novel technique, called Image-Based Surface Detail Transfer, to transfer geometric details from one sur-face to another with simple 2D image operations. The basic observation is that, without knowing its 3D geometry, geo-metric details (local ...
 
Cloning Your Own Face With A Desktop Camera
Found in: Computer Vision, IEEE International Conference on
By Zhengyou Zhang, Zicheng Liu, Denis Adler, Michael Cohen, Erik Hanson, Ying Shan
Issue Date:July 2001
pp. 745
No summary available.
   
Robust head motion computation by taking advantage of physical properties
Found in: Human Motion, Workshop on
By Zicheng Liu, Zhengyou Zhang
Issue Date:December 2000
pp. 73
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 correspondences of five feature points (eye corners, mouth corner...
 
Probabilistic Graphlet Cut: Exploiting Spatial Structure Cue for Weakly Supervised Image Segmentation
Found in: 2013 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)
By Luming Zhang,Mingli Song,Zicheng Liu,Xiao Liu,Jiajun Bu,Chun Chen
Issue Date:June 2013
pp. 1908-1915
Weakly supervised image segmentation is a challenging problem in computer vision field. In this paper, we present a new weakly supervised image segmentation algorithm by learning the distribution of spatially structured super pixel sets from image-level la...
 
Semi-supervised Node Splitting for Random Forest Construction
Found in: 2013 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)
By Xiao Liu,Mingli Song,Dacheng Tao,Zicheng Liu,Luming Zhang,Chun Chen,Jiajun Bu
Issue Date:June 2013
pp. 492-499
Node splitting is an important issue in Random Forest but robust splitting requires a large number of training samples. Existing solutions fail to properly partition the feature space if there are insufficient training data. In this paper, we present semi-...
 
Animated Pose Templates for Modeling and Detecting Human Actions
Found in: IEEE Transactions on Pattern Analysis and Machine Intelligence
By Benjamin Z. Yao,Bruce X. Nie, Zicheng Liu, Song-Chun Zhu
Issue Date:March 2014
pp. 436-452
This paper presents animated pose templates (APTs) for detecting short-term, long-term, and contextual actions from cluttered scenes in videos. Each pose template consists of two components: 1) a shape template with deformable parts represented in an And-n...
 
Learning Actionlet Ensemble for 3D Human Action Recognition
Found in: IEEE Transactions on Pattern Analysis and Machine Intelligence
By Jiang Wang,Zicheng Liu,Ying Wu,Junsong Yuan
Issue Date:October 2013
pp. 1
Human action recognition is an important yet challenging task. Human actions usually involve human-object interactions, highly articulated motions, high intra-class variations and complicated temporal structures. The recently developed commodity depth sens...
 
HON4D: Histogram of Oriented 4D Normals for Activity Recognition from Depth Sequences
Found in: 2013 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)
By Omar Oreifej,Zicheng Liu
Issue Date:June 2013
pp. 716-723
We present a new descriptor for activity recognition from videos acquired by a depth sensor. Previous descriptors mostly compute shape and motion features independently, thus, they often fail to capture the complex joint shape-motion cues at pixel-level. I...
 
Tensor-Based Human Body Modeling
Found in: 2013 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)
By Yinpeng Chen,Zicheng Liu,Zhengyou Zhang
Issue Date:June 2013
pp. 105-112
In this paper, we present a novel approach to model 3D human body with variations on both human shape and pose, by exploring a tensor decomposition technique. 3D human body modeling is important for 3D reconstruction and animation of realistic human body, ...
 
Measuring the engagement level of TV viewers
Found in: 2013 10th IEEE International Conference on Automatic Face & Gesture Recognition (FG 2013)
By Javier Hernandez, Zicheng Liu,Geoff Hulten,Dave DeBarr,Kyle Krum,Zhengyou Zhang
Issue Date:April 2013
pp. 1-7
This work studies the feasibility of using visual information to automatically measure the engagement level of TV viewers. Previous studies usually utilize expensive and invasive devices (e.g., eye trackers or physiological sensors) in controlled settings....
   
Iterative Local-Global Energy Minimization for Automatic Extraction of Objects of Interest
Found in: IEEE Transactions on Pattern Analysis and Machine Intelligence
By Gang Hua, Zicheng Liu, Zhengyou Zhang, Ying Wu
Issue Date:October 2006
pp. 1701-1706
We propose a novel global-local variational energy to automatically extract objects of interest from images. Previous formulations only incorporate local region potentials, which are sensitive to incorrectly classified pixels during iteration. We introduce...
 
Model-Based Bundle Adjustment with Application to Face Modeling
Found in: Computer Vision, IEEE International Conference on
By Ying Shan, Zicheng Liu, Zhengyou Zhang
Issue Date:July 2001
pp. 644
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 of isolated 3D features (usually points), our algorithm ...
 
Towards accurate and robust cross-ratio based gaze trackers through learning from simulation
Found in: Proceedings of the Symposium on Eye Tracking Research and Applications (ETRA '14)
By Jia-Bin Huang, Narendra Ahuja, Qin Cai, Zhengyou Zhang, Zicheng Liu
Issue Date:March 2014
pp. 75-82
Cross-ratio (CR) based methods offer many attractive properties for remote gaze estimation using a single camera in an uncalibrated setup by exploiting invariance of a plane projectivity. Unfortunately, due to several simplification assumptions, the perfor...
     
Real-time human action search using random forest based hough voting
Found in: Proceedings of the 19th ACM international conference on Multimedia (MM '11)
By Gang Yu, Junsong Yuan, Zicheng Liu
Issue Date:November 2011
pp. 1149-1152
Many existing techniques in content based video retrieval treat a video sequence as a whole to match it against a query video or to assign a text label. Such an approach has serious limitations when applied to human action retrieval because an action may o...
     
Speeding up spatio-temporal sliding-window search for efficient event detection in crowded videos
Found in: Proceedings of the 1st ACM international workshop on Events in multimedia (EiMM '09)
By Junsong Yuan, Ying Wu, Zhengyou Zhang, Zicheng Liu
Issue Date:October 2009
pp. 3-8
Despite previous successes of sliding window-based object detection in images, searching desired events in the volumetric video space is still a challenging problem, partially because the pattern search in spatio-temporal video space is much more complicat...
     
Requirements and recommendations for an enhanced meeting viewing experience
Found in: Proceeding of the 16th ACM international conference on Multimedia (MM '08)
By Cha Zhang, Phil A. Chou, Rajesh Hegde, Sasa Junuzovic, Zhengyou Zhang, Zicheng Liu
Issue Date:October 2008
pp. 40-42
We have found that viewing recorded meetings using traditional meeting viewers whose interfaces consist of an automatic speaker and a fixed context view does not provide sufficient information and control to the users. In particular, a survey of users who ...
     
Distributed meetings: a meeting capture and broadcasting system
Found in: Proceedings of the tenth ACM international conference on Multimedia (MULTIMEDIA '02)
By Alex Colburn, Anoop Gupta, Ivan Tashev, JJ Cadiz, Li-wei He, Ross Cutler, Steve Silverberg, Yong Rui, Zhengyou Zhang, Zicheng Liu
Issue Date:December 2002
pp. 503-512
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. Teleconferencing and recording of meetings can address this ...
     
Expressive expression mapping with ratio images
Found in: Proceedings of the 28th annual conference on Computer graphics and interactive techniques (SIGGRAPH '01)
By Ying Shan, Zhengyou Zhang, Zicheng Liu
Issue Date:August 2001
pp. 271-276
Facial expressions exhibit not only facial feature motions, but also subtle changes in illumination and appearance (e.g., facial creases and wrinkles). These details are important visual cues, but they are difficult to synthesize. Traditional expression ma...
     
Rapid modeling of animated faces from video images
Found in: Proceedings of the eighth ACM international conference on Multimedia (MULTIMEDIA '00)
By Chuck Jacobs, Michael Cohen, Zhengyou Zhang, Zicheng Liu
Issue Date:October 2000
pp. 475-476
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 with minimal user interaction. Our system takes images and ...
     
Hierarchical spacetime control
Found in: Proceedings of the 21st annual conference on Computer graphics and interactive techniques (SIGGRAPH '94)
By Michael F. Cohen, Steven J. Gortler, Zicheng Liu
Issue Date:July 1994
pp. 35-42
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 following physical laws such as gravity) has been an elusive goa...
     
 1