1. Digital Image Processing, including Image Restoration,
Quaternion-based color image processing, SuperResolution Image Reconstruction
2. Intelligent Video Surveillance, including Multi-View Object Tracking,
ROI Detection and Recognition, Event Detection
3. Quaternion Wavelet Transform and its Applications in video analysis

Sept.1999 – Mar. 2005, Doctor of Philosophy, Digital Image Processing
and Communication, School of Electronic Information and Electrical Engineering,
Shanghai JiaoTong University.
Sep.1996 -- Apr.1999, Master of Physical Electronics and Optoelectronics, Low-Level Image Processing, School of Electronic and Optical Engineering, Nanjing University of Science and Technology.
Sep.1992 – Jul. 1996, Bachelor of Photoelectric Imaging, School of Electronic and
Optical Engineering, Nanjing University of Science and Technology.

1. Institute of Image Communication and Information Processing, SJTU, Position Held: Associate Professor, Sep. 2007 - now
2. School of Electronic Information and Electrical Engineering, SJTU, Position Held: Postdoc Researcher, Mar.2005 - Nov.2007

1. Theory of Hypercomplex Wavelet Transform and Its Application to Image Processing, National Science Foundation of China (NSFC) , Grant No. 60902073, PI
2. Signal Representation based on Hypercomplex Wavelet Transform, Research Fund for the Doctoral Program of Higher Education of China, Grant No. 200802481006, PI
3. Study on Uncalibrated Stereo Matching in Multi-Viewpoint Video Communication, The Shanghai Postdoctoral Sustentation Fund, Grant No.06R214138, PI

1. Course on Digital Image Processing, Apr. 2010-
2. Best Run Winner in Event Detection, TRECvid 2008/2009

[1] Yi Xu, XiaoKang Yang, Li Song and Traversoni Leonarodo, “QWT Retrospective and new applications,” Springer Verlag London, pp. 248-272, Jan. 2010.
[2] Yi Xu, XiaoKang Yang, PeiFeng Zhang, Li Song and Traversoni Leonarodo, “Cooperative stereo matching using quaternion wavelets and top-down segmentation,” IEEE International Conference on Multimedia & Expo, pp.1954-1957, Beijing, China, July 2-5, 2007.
[3] Yi Xu, Jun Zhou and Guangtao Zhai, “2D phase-based matching in uncalibrated images,” IEEE Workshop on Signal Processing Systems Design and Implementation, pp.325-330, 2005.
[4] Yi Xu, Jun Zhou, YuanHua Zhou, “Phase-based stereo matching and occlusion detection using dynamic programming,” Acta Electronica Sinica, Vol.32, No.4, pp.591-595, 2004.
[5] Yi Xu, Jun Zhou, YuanHua Zhou, “Phase matching based on wavelet transform and dynamic programming,” Journal of Shanghai JiaoTong University, Vol.37, No.3, pp.388-392，2003.
[6] Yi Xu, Jun Zhou and Yuanhua Zhou, “Disparity estimation and occlusion detection in aerial scenes based on the relationship between phase-based and area-based stereo,” Chinese Optics Letters, Vol.8, pp.494-496, 2003.
[7] Li Song, Yi Xu and Cong Xiong, “Improved intra coding methods for H.264/AVC,” EURASIP Journal on Advances in Signal Processing, Vol.2009, Article ID 328958, 9 pages, 2009.
[8] ZhaoWen Wang, XiaoKang Yang, Yi Xu and SongYu Yu, “CamShift guided particle filter for visual tracking,” Pattern Recognition Letters, pp.407-413, 2009.
[9] Jun Zhou, Yi Xu and XiaoKang Yang, “Quaternion wavelet phase based stereo matching for uncalibrated images,” Pattern Recognition Letters, Vol.28, No.12, pp.1509-1522, 2007.
[10] GuangTao Zhai, WenJun Zhang, XiaoKang Yang, WeiSi Lin and Yi Xu, “Efficient image deblocking based on postfiltering in shifted windows,” IEEE Trans. on Circuits and Systems for Video Technology, Vol.18, No.1, pp.122-126, 2008.
[11] BoWen Liu, SongYu Yu, Yi Xu, XiaoKang Yang, “Correspondence techniques for ROI regions in wide-baseline active vision,” Journal of Image and Graphics, Vol.12, No.10, pp. 1917-1921, 2007.
[12] Jun Zhou, Yi Xu and Yuanhua Zhou, “Caption segmentation based on local energy features,” Journal of Image and Graphics, Vol.7, No.11, pp.1134-1138, 2002.
[13] Qing Yan, Yi Xu and XiaoKang Yang, “Real-time pedestrian detection in video surveillance,” Computer Science, Vol.36, No.5A, pp.170-173, 2009.
[14] JiaJun Lu, Yi Xu, “Counting Pedestrians and Cars with an Improved Virtual Gate Method,” 2010 International Conference on Computer Application and System Modeling, V4:448-452.
[15] Ning Li, Yi Xu, Xiaokang Yang, “Part-based human gait identification under clothing and carrying condition variations,” International Conference on Machine Learning and Cybernetics, pp.268-273, 2010.
[16] Zhou Yu, Yi Xu and XiaoKang Yang, “Fire surveillance method based on quaternionic wavelet features,” Special session MMM2010, Lecture Notes on Computer Science 5916, pp.477-488, Springer, Heidelberg, 2010.
[17] Bo Xiao, Xiaokang Yang, Yi Xu, Hongyuan Zha, “Learning distance metric for regression by semidefinite programming with application to human age estimation,” ACM Multimedia, pp.451-460, 2009.
[18] Hao Wang, Yi Xu, XiaoKang Yang, Li Song and WenJun Zhang, “Spatiotemporal phase congruency based invariant features for human behavior classification,” PCM2009, Lecture Notes on Computer Science 5879, pp.100-109, Springer Verlag Berlin Heidelberg, 2009.
[19] Zhou Yu, Yi Xu, XiaoKang Yang and Li Song, “Structure preserving colorization based on quaternionic phase reconstruction,” PCM2009, Lecture Notes on Computer Science 5879, pp.849-859, Springer Verlag Berlin Heidelberg, 2009.
[20] Wei Lu, Yi Xu, XiaoKang Yang and Li Song, “Local quaternionic Gabor binary patterns for color face recognition,” IEEE International Conference on Acoustics, Speech and Signal Processing, pp.741-744, Las Vegas, Nevada, USA, 2008.
[21] Xiaojun Ma, Yi Xu, Li Song, Xiaokang Yang and Hans Burkhardt, “Color image watermarking using local quaternion Fourier spectral analysis,” IEEE International Conference on Multimedia & Expo, pp.233-236, Hannover, Germany, June 23-26, 2008.
[22] Traversoni Leonardo and Yi Xu, “Velocity and object detection using quaternion wavelets,” Numerical Analysis and Applied Mathematics, AIP Conference Proceedings, Vol.936, pp.775-778, 2007.
[23] Peifeng Zhang, Yi Xu, Xiaokang Yang and Traversoni Leonardo, “Multi-scale Gabor phase-based stereo matching using graph cuts,” IEEE International Conference on Multimedia & Expo, pp.1934-1937, 2007.
[24] Zheng Lu, Yi Xu, Xiaokang Yang, Li Song and Traversoni Leonardo, “2D Quaternion Fourier Transform: The spectrum properties and its application in color image registration,” 2007 IEEE International Conference on Multimedia & Expo, pp.1715-1718, 2007. [25] Wei Zhang, XiangZhong Fang and Yi Xu, “Detection of moving cast shadows using image orthogonal transform,” The 18th International Conference on Pattern Recognition, Vol.1, pp.626-629, 2006.
[26] GuangTao Zhai, WenJun Zhang, XiaoKang Yang and Yi Xu, “Modeling blocking visual sensitivity profile,” 2006 IEEE International Conference on Multimedia and Expo, pp.485-488, 2006.
[27] GuangTao Zhai, WenJun Zhang, XiaoKang Yang and Yi Xu, “Image quality assessment metrics based on multi-scale edge presentation,” 2005 IEEE Workshop on Signal Processing Systems Design and Implementation, pp.331-336, 2005.