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Daniel G. Aliaga |
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Associate
Professor of Computer Science Purdue
University 305 N.
University St. West
Lafayette, IN 47907-2066 FAX:
(765) 494-0739 Email:
aliaga at cs purdue edu |
Short Biography:
Dr. Daniel G. Aliaga’s research is primarily in the
area of 3D computer graphics but overlaps with computer vision and with
visualization. He focuses on i) 3D urban modeling (creating novel 3D
urban acquisition algorithms, forward and inverse procedural modeling, and
integration with urban design and planning), ii) projector-camera systems
(focusing on algorithms for spatially-augmented reality and for appearance
editing of arbitrarily shaped and colored objects), and iii) 3D digital
fabrication (creating novel methods for digital manufacturing that embed into a
physical object information for genuinity detection, tamper detection, and
multiple appearance generation). Dr. Aliaga has also performed
research in 3D reconstruction, image-based rendering, rendering acceleration,
and camera design and calibration. To date Prof. Aliaga has published over 80
peer reviewed publications and chaired and served on numerous ACM and IEEE
conference and workshop committees, including being a member of more than 40
program committees, conference chair, papers chair, invited speaker, and
invited panelist. In addition, Dr. Aliaga has served on several NSF panels, is
on the editorial board of Graphical Models, and is a member of ACM SIGGRAPH.
His research has been whole or partially funded by NSF, MTC, Microsoft
Research, Google, and Adobe Inc.
Academic Positions
o Associate Professor, Purdue University, 2010-present.
o Visiting Professor in Computer Vision and Geometry Group,
Department of Computer Science, ETH Zurich, 2011.
o Visiting Professor in Chair for Information Architecture,
Department of Architecture, ETH Zurich, 2011.
o Assistant Professor, Purdue University, 2003-2010.
o Research Staff, Princeton University, 2003.
o Member of Technical Staff, Bell Labs, 1999-2002.
o Ph.D., Computer Science, University of North Carolina at Chapel Hill,
1993-1999.
o M.S., Computer Science, University of North Carolina at Chapel Hill,
1991-1993.
o B.S. Computer Science, Magna Cum Laude, Honors, Brown
University, 1987-1991.
o High School, Colegio Santa
Maria, Lima - Peru, 1982-1986.
Research
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Urban
Modeling and Visualization Our objective is to capture, simulate, and modify models of
urban environments. Today, more than half of the world’s population of 7
billion people lives in cities – and that number is
only expected to grow over the next 30 years. Cities, and urban spaces of all
sizes, are however extremely complex and their modeling is
still not solved. We pursue multi-disciplinary research focused on visual
computing tools for improving the complex urban ecosystem and for “what-if”
exploration of sustainable urban designs, including integrating urban 3D
modeling, simulation, visualization, meteorology, and vegetation modeling. To
date, we have developed several algorithms and large-scale software systems
using ground-level imagery, aerial imagery, GIS data, and forward and inverse
procedural modeling to create/modify 3D and 2D urban models. è
See documentary (2010), “Man-made
Disasters” by National Geographic Documentary as part of NatGeo Naked
Science series, appeared together with Prof. Dev Niyogi on topic of urban
sprawl and urban heat islands. |
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Appearance
Editing: Modifying the Appearance of Real-World Objects Appearance
editing offers a unique way to view visually altered objects with various appearances
or visualizations. By carefully controlling how an object is illuminated
using digital projectors, we obtain stereoscopic imagery for any number of
observers with everything visible to the naked eye (i.e., no need for
head-mounts or goggles). Such ability is useful for various applications,
including scientific visualization, virtual restoration of cultural heritage,
and display systems. è
See blog (2011), “Digital
Restoration: Introducing an Undo Function” by Central Science (C&EN). è
See newscast (2009), “Restoring Art in an
Instant” by Discovery Breakthroughs in
Science (DBIS). |
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Embedding
Information into Physical Objects We seek to provide methods to embed into a physical
object information for a variety of purposes, including genuinity detection,
tamper detection, and multiple appearance generation. Genuinity detection
refers to encoding fragile or robust signatures so that a copy, or tampered,
version can be differentiated from the original object. Multiple appearance
generation refers to generalizing the encoded information from a signature to
a different appearance of the same physical object. The project also includes
the development of underlying infrastructure for 3D model acquisition and for
appearance/signature creation and extraction using projector-based illumination. |
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A
Photogeometric Framework for Capturing 3D Objects We introduce a photogeometric
framework for acquiring 3D objects with sub-millimeter accuracy. The defining
characteristic of our framework is leveraging the complementary advantages of
photometric and geometric acquisition. The two approaches are tightly
integrated in an iterative acquisition process that achieves
self-calibration, multi-viewpoint sampling, and high level of detail. |
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Conventional 3D reconstruction from digital photographs
requires (pre-calibration) or computes (self-calibration) camera pose for
each photograph. We have developed a mathematical framework where the parameters
defining camera poses are eliminated from the nonlinear system of 3-D
reconstruction equations, which leads to significantly more robust and
accurate 3D models. |
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Modeling
Scenes with Strong Inter-reflections Structured light is a powerful approach for acquiring 3-D
models of real world scenes. The scene is illuminated with a custom pattern
of light and imaged with a digital camera. An important challenge in
structured light acquisition comes from glossy and specular objects which
reflect the patterns of light and create false positives. We have developed
an iterative and adaptive algorithm that reduces the inter-reflection within
the scene, which leads to robust pixel classification and to accurate and
dense 3-D reconstruction. |
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Modeling
Repetitive Motion in Real-World 3D Scenes Most 3-D acquisition systems assume that the scene is
static. We have taken significant steps towards supporting the acquisition of
dynamic scenes by developing algorithms that detect and leverage repetitive motion
in the scene (e.g. person walking, flag waving). Our approach produces
space-time 3D models using as few as two cameras or one camera-projector
pair. |
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Occlusion-Resistant
Camera Designs: Acquiring Active Environments Obtaining image sequences of popular and active
environments is often hindered by unwanted interfering occluders.
In this work, we propose a family of Occlusion-Resistant Camera designs for
acquiring such environments. Our cameras explicitly remove interfering occluders from acquired data in real-time, during live
capture. |
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We present an image-based approach to providing
interactive and photorealistic walkthroughs of complex indoor environments.
Our strategy is to obtain a dense sampling of viewpoints in a large static
environment with omnidirectional images and to replace the 3D reconstruction
challenges with easier problems of motorized-cart control, dense image-based
sampling, and compression. |
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The project investigates several graphical and educational
tools using Tablet PCs. We have developed hardware and software tools for
tabletop mixed-reality and for Tablet PC applications in classrooms. |
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A key component of providing realism is rendering large
and detailed 3D models at high frame rates. We explore various rendering
acceleration methods, including visibility culling, geometry simplification,
and image-based rendering. |
Diversity
Publications
Selected recent publications:
·
Inverse Design
of Urban Procedural Models, C. Vanegas, I. Garcia-Dorado, D. Aliaga, B.
Benes, P. Waddell, ACM Transactions on
Graphics (TOG), also SIGGRAPH Asia,
11 pages, 2012.
·
Visualization-based
Decision Tool for Urban Meteorological Modeling, D. Aliaga, C. Vanegas, M. Lei, D. Niyogi, Environment
and Planning B: Planning and Design (EPB), 12 pages, 2012.
·
Hiding a Second Appearance in a Physical Relief Surface, Y. Chao, D. Aliaga, Proceedings of Information Hiding Conference (IH), 15 pages, 2012.
·
Tailored Displays to Compensate for Visual Aberrations, V. Pamplona, M. Oliveira, D. Aliaga, R. Raskar, ACM Transactions on Graphics (TOG), 12
pages, 2012.
·
Fast High
Resolution Appearance Editing using Superimposed Projections, D. Aliaga, Y.
H. Yeung, A. Law, B. Sajadi, A. Majumder, ACM Transactions on Graphics (TOG), 12
pages, 2012.
·
Procedural
Generation of Parcels in Urban Modeling, C. Vanegas, T. Kelly, B. Weber, J.
Halatsch, D. Aliaga, P. Mueller, Proceedings of EUROGRAPHICS (EG) (also Computer Graphics Forum, 31:2), 15
pages, 2012.
All publications:
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Courses
Current course: Spring 2013 – CS251 and CS434
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Number |
Title |
Year |
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CS590G/CS635 |
Capturing, Modeling, Rendering 3D Structures |
Fall 2003, Fall 2004, Spring 2007, Spring 2009, Spring 2010 |
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CS590M |
Geometric Modeling and Applications |
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CS535 |
Interactive Computer Graphics |
Fall 2005, Fall 2007, Fall 2010, Fall 2012 |
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CS530 |
Introduction to
Scientific Visualization |
Fall 2009 |
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CS490G |
Tablet PC Graphics |
Spring 2004, Spring 2005, Spring
2006 |
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CS434 |
Advanced Computer
Graphics |
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CS397/CS497 |
Honor's Research |
Fall 2004 |
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CS334 |
Fundamentals of Computer Graphics |
Spring 2008, Fall 2008, Spring 2012 |
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CS251 |
Data Structures |
Fall 2006, Spring 2013 |
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CS197 |
Freshman Honor’s
Seminar |
Students
Graduate:
Advisee’s
Ignacio Garcia-Dorado (CS,
PhD student)
Ilke Demir (CS, PhD student)
Feng Meng (CS, PhD student)
Carlos
Vanegas (CS, PhD 2012, went to Postdoc @ UC Berkeley)
Alvin Law (CS, PhD 2011, went to
Google)
Yi Xu (CS, PhD 2010, went to GE
Research)
Daniel
Bekins (CS, MS 2005, went to Electronic Arts)
Scott
Yost (CS, MS 2004, went to Microsoft)
Committee
member:
Paul
Schmid (EAS, PhD student)
Paul
Rosen (CS, PhD 2010, went
to Research Asst Prof @ University of
Utah)
Mihai Mudure
(CS, PhD 2008, went to Google)
Huiying Xu (CS, PhD 2007, went to Cisco)
David
Gotz (CS, PhD 2005, UNC, went to IBM Research)
Undergraduate:
David
Fifer (CS, BS 2013)
Yeong-Ouk Kim (CS, BS 2012)
John
McCoy Crofts (CS, BS 2012)
Andy
Feldkamp (CGT, BS 2011)
Tyler
Smith (CS, BS 2011)
Philip
Jarvis (CS, BS 2011)
Aaron
Link (CS, BS 2009)
Robert
Insley (CS, BS 2008)
Dat Nyugen, Nitin Nalreja, Nimesh Amin (CS, BS 2006)
Paul
Ardis (CS, BS 2005, now at Univ. Rochester)
Jamie
Gennis (CS, BS 2005, now at NVIDIA)
Jonathan
Deutsch (CS, BS 2005, now at Apple Corp)
Darin
Rajan (CS, BS 2005)
Research Funding
o 
NSF CBET, (PI) “STRONG Cities – Simulation
Technologies for the Realization of Next Generation Cities”, 2012-2015.
o 
Metropolitan Transportation Commission,
(Co-PI) “Urban Simulation Visualization”, 2011-2013.
o 
Google Research Award, (PI) “Modeling of
Buildings from Photographs”, 2011-present.
o NSF IIS, (PI) “Integrating Behavioral,
Geometrical and Graphical Modeling to Simulate and Visualize Urban Areas”,
2010-2013.
o NSF CNS, (PI) “A Computational Framework for
Marking Physical Objects against Counterfeiting and Tampering”, 2009-2013.
o NSF OCI, “INTEROP: Developing Community-based
Drought Information Network Protocols and Tools for Multidisciplinary Regional
Scale Applications (DRInet)”, 2008-2013.
o 
Purdue-IUPUI Applied Research Grant, (PI)
“Digital Inspection and Virtual Restoration of 3D Objects”, 2008-2009.
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Adobe Inc., (Co-PI) “Vector Pattern Modeling and Editing“, 2008-present.
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PACE/Hewlett-Packard Hardware Grant, (PI)
2008.
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NSF REU, (PI) “3D Scene Digitization”,
2006-2008.
o NSF MSPA-MCS, (PI) “3D Scene Digitization: A
Novel Invariant Approach for Large-Scale Environment Capture”, 2004-2008.
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Microsoft Research, (PI) “PMR: Portable Mixed
Reality”, 2005-present.
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Microsoft Research, (PI) “MRT: A Mixed Reality
Tabletop”, 2004-present.
Recent Professional Activities
o “Appearance Editing: What you see is
not what you have”, Invited Talk, 3rd Annual SIGGRAPH Chapter Conference,
Bogota, Colombia, October, 2012
o Program Committee for IEEE CVPR 2013
o “Cities of Tomorrow: Visual Computing for
Designing Sustainable Urban Ecosystems”, Keynote @ National Socio-Environmental
Synthesis Center (SESYNC) Workshop: Visualization Technologies to Support
Research on Human-Environmental Interactions, July 2012
o “Appearance Editing”, Invited Talk @
UMIACS, University of Maryland at College Park, July 2012
o Program Committee for 3DPVT 2012
o Program Committee for ECCV 2012
o Program Committee for IEEE PROCAMS
2012
o Program Committee for IEEE CVPR 2012
o Conference Committee for Int’l
Conference on Computing for Geospatial Research & Applications 2012
o Program Committee for ACM Symposium in
Interactive 3D Graphics 2012
o “Appearance Editing”, Invited Talk,
ETH Computer Science/Disney Research Lab, Zurich, Switzerland, November 2011
o Invited Panelist for APCOSE 2011
o “Computational Cities: Geometrical
Modeling for Urban Design and Simulation”, Invited Talk, Center for Image
Analysis, Uppsala University, Sweden, September 2011
o “Computational Cities: Geometrical
Modeling for Urban Design and Simulation”, Invited Talk, Department of Urban
Systems Engineering, Technical University of Compiegne, Compiegne, France, June
2011
o Program Committee for IEEE
Visualization 2011
o "Computational Cities:
Geometrical Modeling for Urban Design and Simulation", Invited Talk, Qatar
Energy and Environment Institute and Qatar Computing Research Institute, Qatar
Foundation, Doha, Qatar, April 2011
o Program Committee for IEEE ICCV 2011
o Program Committee for IEEE CVPR 2011
o "Computational Cities:
Geometrical Modeling for Urban Design and Simulation", Spring Colloquium
Talk, Department of Informatics, University of Zurich, Zurich, Switzerland,
March 2011
o Conference Committee for Int’l
Conference on Computing for Geospatial Research & Applications 2011
o Program Committee for ACM Symposium in
Interactive 3D Graphics 2011
o Program Committee for IEEE PROCAMS
2010
o Program Committee ECCV Workshop on
Reconstruction and Modeling of Large-Scale 3D Virtual Environments 2010
o Program Committee for SIBGRAPI 2010
o "Designing Smarter Cities by
Integrating Urban Behavioral and Geometrical Simulation", Featured Note,
1st International Conference on Computing for Geospatial Research and
Applications, Washington, DC, June, 2010
o Conference Committee for Int’l
Conference on Computing for Geospatial Research & Applications 2010
o "Designing and Modeling
Intelligent Cities", Invited Talk, Department of Architecture, Universidad
Central del Ecuador, Quito, Ecuador, June, 2010
o "Designing and Modeling
Intelligent Cities", Invited Talk, Department of Engineering, Universidad Politecnica, Quito, Ecuador, May, 2010
o "Designing and Modeling Intelligent
Cities", Invited Talk, Department of Engineering and Informatics,
Universidad Catolica, Quito, Ecuador, May, 2010
o "Designing and Modeling
Intelligent Cities", Invited Talk, Department of Informatics, Universidad Catolica, Lima, Peru, May, 2010.
o Papers Co-Chair for ACM Symposium on Interactive 3D
Graphics and Games 2010
o "Towards Designing and Modeling
Smarter Cities", Invited Talk, NAVTEQ, Chicago, IL, April, 2010
o Program Committee for ACM Int'l Symposium
on Mixed and Augmented Reality 2010
Personal
o Hobbies:
vintage computers, astronomy, model trains, martial arts, soccer, mountain
biking
o Languages:
English, Spanish, some German
o Family, Wedding, some
videos