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Displaying 1-22 out of 22 total
Pairwise Harmonics for Shape Analysis
Found in: IEEE Transactions on Visualization and Computer Graphics
By Youyi Zheng, Chiew-Lan Tai,E. Zhang, Pengfei Xu
Issue Date:July 2013
pp. 1172-1184
This paper introduces a simple yet effective shape analysis mechanism for geometry processing. Unlike traditional shape analysis techniques which compute descriptors per surface point up to certain neighborhoods, we introduce a shape analysis framework in ...
 
Nested-SIFT for Efficient Image Matching and Retrieval
Found in: IEEE MultiMedia
By Pengfei Xu,Lei Zhang,Kuiyuan Yang,Hongxun Yao
Issue Date:July 2013
pp. 34-46
To improve the effectiveness of feature representation and the efficiency of feature matching, we propose a new feature representation, named Nested-SIFT, which utilizes the nesting relationship between SIFT features to group local features. A Nested-SIFT ...
 
Image Fusion Based on NSCT and Bandelet Transform
Found in: 2012 Eighth International Conference on Computational Intelligence and Security (CIS)
By Qiguang Miao,Jingjing Lou,Pengfei Xu
Issue Date:November 2012
pp. 314-317
A novel image fusion algorithm based on non-sub sampled contour let transform(NSCT) and Bandelet transform is proposed in this paper. As two different MGA tools, NSCT can give an asymptotic optimal representation of edges and contours in image by virtue of...
 
A General Edge Detection Method Based on the Shear Transform
Found in: Computational Intelligence and Security, International Conference on
By Qiguang Miao,Pengfei Xu,Weisheng Li,Hai Zhu
Issue Date:December 2011
pp. 1400-1404
In this paper, we propose an edge detection method for detecting edges by combining a traditional edge detection operator with shear transform utilizing the fact that the shearing operation provides a more favorable treatment of directions. The shearing op...
 
Highly Parallel Surface Crack Simulation
Found in: Computer Graphics, Imaging and Visualization, International Conference on
By Shuji Hao,Mingqu Zhou,Zhongke Wu,Pengfei Xu,Hongming Zhang
Issue Date:August 2011
pp. 82-86
We show a parallel surface crack generation algorithm based on physical method that runs mostly on the GPU. According to existing physically correct surface crack generation, our algorithm firstly proposes a new data structure from the given set of points ...
 
Mesh Segmentation with Concavity-Aware Fields
Found in: IEEE Transactions on Visualization and Computer Graphics
By Oscar Kin-Chung Au,Youyi Zheng,Menglin Chen,Pengfei Xu,Chiew-Lan Tai
Issue Date:July 2012
pp. 1125-1134
This paper presents a simple and efficient automatic mesh segmentation algorithm that solely exploits the shape concavity information. The method locates concave creases and seams using a set of concavity-sensitive scalar fields. These fields are computed ...
 
Robust Stereo Matching Combining SIFT Descriptor with NCC under MRF Framework
Found in: Pervasive Computing, Signal Porcessing and Applications, International Conference on
By Wenkai Li, Hongxun Yao, Rongrong Ji, Pengfei Xu, Xianming Liu, Debin Zhao
Issue Date:September 2010
pp. 1018-1021
There have been several stereo matching methods that perform well under the circumstance of color consistency. However, various factors including radiometric and device variations between images will drop color consistency and then seriously degrade the pe...
 
Individual Home-Video Collecting Using a Co-clustering Method
Found in: Pervasive Computing, Signal Porcessing and Applications, International Conference on
By Baqun Sun, Hongxun Yao, Rongrong Ji, Pengfei Xu, Xiaoshuai Sun, Kun Yuan
Issue Date:September 2010
pp. 1132-1135
This paper presents a framework to extract subset which only contains one person’s video segments from a superfluous home video set. This is a semantic level multimedia application. We proposed a co-clustering method based on facial and body feature, and d...
 
Order Schedule on Multi-mixed-model Assembly Lines in Assemble-to-Order Environments
Found in: Information Science and Management Engineering, International Conference of
By Guicong Wang, Huanyong Cui, Pengfei Xu
Issue Date:August 2010
pp. 563-566
An order schedule problem in a short planning period on multi-mixed-model assembly lines under assemble-to-order environments is discussed. Each line is characterized by different start time, cycle time and operation cost. We seek to minimize the total ass...
 
Global Face Recognition Framework Based on Symmetrical 2DPLS by Two Sides Plus LDA
Found in: Education Technology and Computer Science, International Workshop on
By Jiadong Song, Xiaojuan Li, Pengfei Xu, Mingquan Zhou
Issue Date:March 2010
pp. 60-64
A novel face recognition method is proposed in this paper to alleviate the
 
Semi-Supervised Top-k Query in Wireless Sensor Networks
Found in: Young Computer Scientists, International Conference for
By Hailan Shen, Deng Li, Pengfei Xu, Zailiang Chen
Issue Date:November 2008
pp. 487-492
This paper focuses on top-k query in wireless sensor networks and proposes a semi-supervised top-k query approach called CAV. Based on a spanning tree model, CAV adopts histogram technique and an aggregate-verify mechanism to guide query and filter the use...
 
Random Sampling SVM Based Soft Query Expansion for Image Retrieval
Found in: Image and Graphics, International Conference on
By Zhen Zhang, Rongrong Ji, Hongxun Yao, Pengfei Xu, Jicheng Wang
Issue Date:August 2007
pp. 805-809
This paper focuses on the problem that relevance feedback schemes based on support vector machines (RF-SVM) always give a poor performance when the numbers of positive/negative feedback examples are strongly asymmetric. To address this issue, we propose a ...
 
Age classification based on back-propagation network
Found in: Proceedings of the Fifth International Conference on Internet Multimedia Computing and Service (ICIMCS '13)
By Hongxun Yao, Pengfei Xu, Yanhao Zhang, Ying Zheng
Issue Date:August 2013
pp. 319-322
In this paper, a novel approach is proposed for age classification of face images. In consideration of the difference of adolescents and adults in aging mode, we utilize the facial feature ratios to classify face images into two groups: juveniles and adult...
     
Lazy selection: a scribble-based tool for smart shape elements selection
Found in: ACM Transactions on Graphics (TOG)
By Chiew-Lan Tai, Hongbo Fu, Oscar Kin-Chung Au, Pengfei Xu
Issue Date:November 2012
pp. 1-9
This paper presents Lazy Selection, a scribble-based tool for quick selection of one or more desired shape elements by roughly stroking through the elements. Our algorithm automatically refines the selection and reveals the user's intention. To give the us...
     
Context-Aware Semi-Local Feature Detector
Found in: ACM Transactions on Intelligent Systems and Technology (TIST)
By Hongxun Yao, Pengfei Xu, Qi Tian, Rongrong Ji, Xianming Liu, Xiaoshuai Sun
Issue Date:May 2012
pp. 1-27
How can interest point detectors benefit from contextual cues? In this articles, we introduce a context-aware semi-local detector (CASL) framework to give a systematic answer with three contributions: (1) We integrate the context of interest points to recu...
     
Learning heterogeneous data for hierarchical web video classification
Found in: Proceedings of the 19th ACM international conference on Multimedia (MM '11)
By Hongxun Yao, Pengfei Xu, Qi Tian, Rongrong Ji, Xianming Liu, Xiaoshuai Sun
Issue Date:November 2011
pp. 433-442
Web videos such as YouTube are hard to obtain sufficient precisely labeled training data and analyze due to the complex ontology. To deal with these problems, we present a hierarchical web video classification framework by learning heterogeneous web data, ...
     
Video indexing and recommendation based on affective analysis of viewers
Found in: Proceedings of the 19th ACM international conference on Multimedia (MM '11)
By Hongxun Yao, Pengfei Xu, Rongrong Ji, Sicheng Zhao, Xianming Liu, Xiaoshuai Sun
Issue Date:November 2011
pp. 1473-1476
Most previous works on video indexing and recommendation were only based on the content of video itself, without considering the affective analysis of viewers, which is an efficient and important way to reflect viewers' attitudes, feelings and evaluations ...
     
Unsupervised fast anomaly detection in crowds
Found in: Proceedings of the 19th ACM international conference on Multimedia (MM '11)
By Hongxun Yao, Pengfei Xu, Rongrong Ji, Xianming Liu, Xiaoshuai Sun
Issue Date:November 2011
pp. 1469-1472
In this paper, we proposed a fast and robust unsupervised framework for anomaly detection and localization in crowed scenes. Our method avoids modeling the normal state of the crowds which is a very complex task due to the large within class variance of th...
     
What is a complete set of keywords for image description & annotation on the web
Found in: Proceedings of the seventeen ACM international conference on Multimedia (MM '09)
By Hongxun Yao, Pengfei Xu, Rongrong Ji, Xianming Liu, Xiaoshuai Sun
Issue Date:October 2009
pp. 613-616
Does there exist a compact set of keywords that can completely and effectively cover the image annotation problem by expanding from it? In this paper, we answer this question by presenting a complete set framework for image annotation, which is motivated b...
     
Place retrieval with graph-based place-view model
Found in: Proceeding of the 1st ACM international conference on Multimedia information retrieval (MIR '08)
By Hongxun Yao, Pengfei Xu, Rongrong Ji, Tianqiang Liu, Xianming Liu, Xiaoshuai Sun
Issue Date:October 2008
pp. 1-1
Places in movies and sitcoms could indicate higher-level semantic cues about the story scenarios and actor relations. This paper presents a novel unsupervised framework for efficient place retrieval in movies and sitcoms. We leverage face detection to filt...
     
Cross-media manifold learning for image retrieval & annotation
Found in: Proceeding of the 1st ACM international conference on Multimedia information retrieval (MIR '08)
By Hongxun Yao, Pengfei Xu, Rongrong Ji, Tianqiang Liu, Xianming Liu, Xiaoshuai Sun
Issue Date:October 2008
pp. 1-1
Fusion of visual content with textual information is an effective way for both content-based and keyword-based image retrieval. However, the performance of visual & textual fusion is affected greatly by the data noise and redundancy in both text (such ...
     
Attention-driven action retrieval with DTW-based 3d descriptor matching
Found in: Proceeding of the 16th ACM international conference on Multimedia (MM '08)
By Hongxun Yao, Pengfei Xu, Rongrong Ji, Tianqiang Liu, Xianming Liu, Xiaoshui Sun
Issue Date:October 2008
pp. 40-42
From visual perception viewpoint, actions in videos can capture high-level semantics for video content understanding and retrieval. However, action-level video retrieval meets great challenges, due to the interferences from global motions or concurrent act...
     
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