Ramani Duraiswami

I am an associate professor in the department of computer science and of the University of Maryland Institute of Advanced Computer Studies (UMIACS). I direct research at the Perceptual Interfaces and Reality Laboratory (PIRL), and have broad research interests in computer audition, computer vision and scientific computing.

Research Interests

Audio and Computational Acoustics:

Acoustics for perceptual reality:  Head Related Transfer Functions, Room Impulse Responses, Auditory Telepresence, Reproduction of audio using headphones, Reproduction using speakers

Microphone Arrays: Beamforming, Source Localization, Source Modeling, Spherical Microphone Arrays, Cameras and Arrays, The Audio Camera

Auditory User Interfaces: Sonification of Data, Systems for presentation, auditory prosthesis for the visually impaired

Underwater acoustics (older stuff): Bubble counting, sound propagation in bubbly media and fog

Scientific Computing:

Fast Multipole Methods: Data Structures; Adaptive Algorithms; FMM for the Laplace, Helmholtz, Biharmonic, Maxwell and Stokes kernels; General kernels; Scattering problems

High Performance Computing: GPU Computing, Parallel Computing

Computational Statistics and Learning Methods: Improved Fast Gauss Transform in high dimensions; Mean-Shift mode seeking; Particle Filters; "Fast N-Body Learning"; Classification, Ranking, Gaussian Processes, Data Assimilation.

Data Fitting and Modeling: RBF interpolation; Data Structures for higher dimensional data; Non Uniform Fast Fourier Transforms, Assimilation

Boundary Element Methods: Speedup via the FMM; Computation of singular and near singular integrals; Meshless Methods; Software.

Other (older stuff): Electrical Impedance Tomography; Bubble Dynamics; Free surface flow; Spectral Methods; Effective Media; Inverse problems.

Computer Vision:

Vision aware audio; Tracking; Pose; Kernel methods, Vision based prosthetics for the visually impaired, application of fast algorithms to computer vision and image processing, The Audio Camera.

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Software

Open Source:

FIGTREE (Improved fast gauss transform plus tree based nearest neighbor search)

FLAGON (Using GPUs via CUDA from Fortran 9X)

Canny Edge Detection on NVIDIA CUDA

Commercial:

Several Fast Multipole Method based products are sold by Fantalgo

.

Teaching

Fall 2008, Spring 2007, Fall 2005: CMSC 460/AMSC/MAPL 460: Computational Methods.

Fall 2002, 2003, 2004, 2006, Spring 2008:  CMSC 878R: Fast Multipole Methods: Fundamentals and Applications, with Nail A. Gumerov (also listed as AMSC 698R and MAIT 627)

Spring 2006: CMSC828D : Algorithms and systems for capture and playback of spatial audio

Spring 2005: CMSC 426: Computer Vision

Spring 2001 - now, Group Seminar: Weekly CFAR seminar to promote intra-lab discussion and dissemination of results.

Fall 2000: CMSC 828D: Fundamentals of Computer Vision (with Larry Davis, Daniel DeMenthon)

Spring 2000: Reading Course on Statistical Pattern Recognition (with Daniel DeMenthon)

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Other Affiliations

I am a member of the following programs and centers, all at the University of Maryland, College Park.

	Center for Automation Research
	Applied Mathematics and Scientific Computing Program,
	The Norbert Wiener Center for Harmonic Analysis and Applications
	Burgers Program for Fluid Mechanics

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Professional Service

Associate editor of the ACM Transactions on Applied Perception.

I organize (with David Jacobs) the weekly CFAR local seminar.

Member, Audio and Electroacoustics Technical Committee, IEEE Signal Processing Society.

I am an ad hoc reviewer for several journals and conferences.

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Book

Our book: Fast Multipole Methods for the Helmholtz Equation in Three Dimensions (The Elsevier Electromagnetism Series) was published by Elsevier

.) For table of contents see here.

Meetings

I was local arrangements chair of IEEE Vis2006 and InfoVis 2006 held at Baltimore in October 2006.

I was a co-organizer and finance chair of The Second International Symposium on 3D Data Processing, Visualization, and Transmission  held between September 7 to 10, 2004 in the city of Thessaloniki, Greece.

I was program chair of the 3rd International Conference on Mobile and Ubiquitous Multimedia (MUM2004) College Park, Maryland, U.S.A. October 27 - 29, 2004

I was an organizer and finance chair of CVPR 2004, Washington, DC, 27^th June - 2^nd July, 2004.

I was lead organizer of the workshop Fast Multipole Method, Tree-Code and Related Approximate Algorithms held at the Center for Scientific Computing and Applied Mathematical Modeling at the University of Maryland. (April 19 - April 30, 2004)

I was lead organizer of the workshop on Audio Assistive Technologies for the visually impaired, held in conjunction with the International Conference on Auditory Displays (ICAD) in Boston in July 2003.

I was submissions chair for the Fifth International Conference on  Automatic Face and Gesture Recognition held in May 2002 in Washington D.C.

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Students/Student Collaborators

Currently Enrolled Students

Adam O'Donovan (Computational Perception) (NVIDIA Fellowship)

Balaji Vasan (Statistical Machine Learning for Climate)

Gordon Rubin (Audio and Music Perception) (AT&T Fellowship)

Huimin Guo (Speaker Recognition at a Distance)

Hu Qi (GPU based Scientific Computing)

Shravya Reddy Konda (LIDAR Data Processing)

Yuancheng Luo (Scientific Computing on GPUs)

Graduated

Vikas Raykar (HRTF synthesis, microphone arrays, computational machine learning) (now at Siemens Corporate Research, Malvern PA)

Zhiyun Li (Auditory scene capture and recreation) (now at Leica)

Changjiang Yang (improved computational vision algorithms, fast Gauss transform, regularization) (now at Sarnoff)

Dmitry Zotkin (computational audio, microphone arrays, video-conferencing, active human tracking) (now at University of Maryland)

Zhenyu Zhang (Computational Nanoscience) (now at GE)

Yang Wang (visualization of versions of the Fast Multipole Method) (now at the University of Michigan Law School)

Vasanth Philomin (Intelligent Vehicles, robust condensation) (now at Phillips, Aachen, Germany)

Ross Cutler (Keck Laboratory) (now at Microsoft, Redmond, WA)

Ahmed Elgammal (fast summation algorithms for computer vision) (now at Rutgers University)

Ankur Mohan (vision algorithms for creating auditory space) (now at Hughes)

Zhihui Tang (fast translation operators for the FMM, acoustical BEM) (now at a private firm on Wall Street)

Kexue Liu (MS, Elastic matching methods) (now at a private R&D firm)

Ali Zandifar (shape from differential geometry, prosthetic devices for the visually impaired) (now at a Bay area start-up)

Hazem El-Alfy (MS, stochastic pdes) (now a Ph.D. student with Larry Davis at University of Maryland)

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Collaborators/Group Members

Nail A. Gumerov (Research Associate Professor)

Dmitry N. Zotkin (Assistant Research Scientist)

Former Members

Elena Grassi (now a researcher at Army Audiology and Speech Center, Walter Reed Army Medical Center, Washington, DC)

Visitors

Prof. B. Yegnanarayana

Prof. Fadoulourahmane Seydou

Prof. Pascal Fua

Contact Information

E-mail address: ramani AT umiacs.umd.edu

Web address: http://www.umiacs.umd.edu/~ramani

Phone: (301) 405 6710 Fax: (301) 314 9658

Mail address:

UMIACS, Univ. of Maryland, Room 3365 A.V. Williams Building, Building 115, College Park, MD 20742

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