Assistant Computer Scientist, Computational Science Initiative
Email: xuw AT bnl DOT gov
Research Assistant Professor (visiting), Computer Science Department
Email: wxu AT stonybrook DOT edu
My research interests are Big Data, Information Visualization, Visual Analytics, Streaming Visualization, Machine Learning, Virtual Reality, Augmented Reality, X-ray Imaging and High Performance Computing.
Brookhaven National Laboratory
Research into novel streaming visualization and visual analytics paradigms to facilitate data analysis for NSLS-II: (i) interactive high dimensional information exploration, (ii) structures, trends, anomalies discovery, and (iii) streaming data visualization.
Adopt deep learning techniques to discover hierarchical and physically-meaningful insights from scientific image datasetsby analyzing data at multiple levels.
Selected Research Projects
Brookhaven National Laboratory
Implemented and compared the computation performance and code porting effort for two iterative tomography reconstruction algorithms on both NVIDIA Tesla GPU and Intel Xeon Phi coprocessor.
Designed and implemented a web-based prototype graphical user interface for online data analysis of experiments conducted on NSLSII. This platform included: (i) web-based front-end interface including composable workflow design, multiple job submission, 2D/3D data visualization, provenance control and related user interaction; (ii) back-end support including multi-core cluster based high performance computing and data management.
Refined and proposed new solutions for existing X-ray imaging algorithms including differential phase contrast, 2D/3D spectroscopy, tomography, ptychography and fluorescence based on different imaging modalities.
(i) Proposed a non-local means based de-noising method employing artifact-free and artifact-matched reference image pairs as priors to overcome the noise and streak artifacts in low-dose CT scans; (ii) devised and implemented image database query framework including SIFT-flow registration, dense SIFT feature generation, kd-tree, k-means clustering, vector quantization and histogram intersection.
(i) Proposed and compared four low-level de-noising filters - bilateral, trilateral, non-local means and adaptive non-local means in the use of reconstruction process in CT. They were applied as non-iterative regularization step replacing traditional total variation minimization; (ii) proposed two parameter learning strategies: exhaustive benchmark test and multi-objective optimization using genetic algorithms. A new perceptual image quality metric was also presented.
(i) Generalized two algebraic CT reconstruction algorithms into an ordered subset scheme and mapped it to the architecture and programming model of GPUs; (ii) proposed and compared two subset grouping strategies and two relaxation factor selection schemes; (iii) devised a specific framework for Electron Tomography with long object compensation and some performance speedup techniques.
(i) Devised and implemented several texture mapping algorithms for a 3D image based modeling system based on the geometric relationships between the viewing angle and the surface normal; (ii) implemented two background subtraction algorithms for a marker-free 3D image based modeling system using multiple synchronized cameras.
Selected Publications (full list)
W. Xu and D. Feng, 4th International Conference on Image Formation in X-Ray Computed Tomography, Bamberg, Germany, July 2016 (to appear)
Li Li, Hanfei Yan, Wei Xu, Dantong Yu, Eric Dill, Annie Heroux, Wah-Keat Lee and Yong S. Chu (submitted)
W. Xu, Z. Zheng, E. Papenhausen, S. Ha and K. Mueller, Graphic Processing Unit-based High Performance Computing in Radiation Therapy (Chapter 4), CRC Press, 2015
S. Yao, C. Chang, W. Xu, N. Zhou, Y. K. Chen-Wiegart, J. Wang, J. Wang and D. Yu, International Symposium on Biomedical Imaging, Brooklyn, NY, 2015
C. Q. Wu, X. Lin, D. Yu, Wei Xu, and L. Li, Transactions on Cloud Computing 2014
Cheng Chang, Wei Xu, Karen Yuchen Chen-Wiegart, Jun Wang, and Dantong Yu, SPIE Electronic Imaging, San Francisco, CA, Feb. 2014
Cheng Chang, Wei Xu, Hanfei Yan, Li Li, Yong S. Chu, and Dantong Yu, 10th International Conf. and Expo on Emerging Tech. for a Smarter World, Stony Brook, NY Oct 2013
Wei Xu, Sungsoo Ha, Ziyi Zheng and Klaus Mueller, 12th Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, Lake Tahoe, CA, June 2013
Wei Xu, Sungsoo Ha and Klaus Mueller, Medical Physics, 40(3), 031109, pp. 1-7, 2013
Wei Xu and Klaus Mueller, Medical Physics, vol. 39 (8), pp. 4748-4760, 2012
Wei Xu, Sungsoo Ha and Klaus Mueller, The Second International Conference on Image Formation in X-Ray Computed Tomography, Salt Lake City, Utah, June, 2012 (Oral)
Wei Xu and Klaus Mueller, 11th Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, Potsdam, Germany, pp.116-119, July 2011 (Oral)
Wei Xu and Klaus Mueller, GPU Computing Gems Emerald Edition, Chapter 43, January 26th 2011
Wei Xu, Fang Xu, Mel Jones, Bettina Keszthelyi, John Sedat, David Agard and Klaus Mueller, Journal of Structural Biology 171(2):142-153, 2010
Fang Xu, Wei Xu, Mel Jones, Bettina Keszthelyi, John Sedat, David Agard and Klaus Mueller, Computer Methods and Programs in Biomedicine 98(3):261-270, 2010
Wei Xu and Klaus Mueller, IEEE Medical Imaging Conference, Knoxville, Tennessee, October 2010
Wei Xu and Klaus Mueller, 10th Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, pp.251-254, Beijing, China, September 2009 (Oral)
Last Updated: 03/08/2016