Research
I work broadly in computer graphics and computer vision, but I focus on computational imaging: this is the joint design of optics, electronics, and computation to create imaging systems with unprecedented capabilities. Some examples include: imaging systems that can see around corners or through skin; passive 3D sensing systems with extreme resolution; ultrafast programmable lenses; imaging systems that adapt to their environments. Technical keywords that often show up in my research include: non-line-of-sight imaging, single-photon imaging, LiDAR, SONAR, interferometry, speckle, acousto-optics, physics-based rendering, differentiable rendering, Monte Carlo simulation, probabilistic modeling.
Publications
3D reconstruction with fast dipole sums
Hanyu Chen, Bailey Miller, Ioannis Gkioulekas
ACM Transactions on Graphics (SIGGRAPH Asia), 2024
Differential walk on spheres
Bailey Miller, Rohan Sawhney, Keenan Crane, Ioannis Gkioulekas
ACM Transactions on Graphics (SIGGRAPH Asia), 2024
Walkin' Robin: Walk on stars with Robin boundary conditions
Bailey Miller*, Rohan Sawhney*, Keenan Crane†, Ioannis Gkioulekas†
ACM Transactions on Graphics (SIGGRAPH), 2024(best paper award)
Aperture-aware lens design
Arjun Teh, Ioannis Gkioulekas, Matthew O'Toole
SIGGRAPH, 2024
Path sampling methods for differentiable rendering
Tanli Su, Ioannis Gkioulekas
Eurographics Symposium on Rendering (EGSR), 2024
Objects as volumes: A stochastic geometry view of opaque solids
Bailey Miller, Hanyu Chen, Alice Lai, Ioannis Gkioulekas
IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024(best student paper award)
Trilateration using unlabeled path or loop lengths
Ioannis Gkioulekas, Steven J. Gortler, Louis Theran, Todd Zickler
Discrete & Computational Geometry, 2023
Doppler time-of-flight rendering
Juhyeon Kim, Wojciech Jarosz, Ioannis Gkioulekas, Adithya Pediredla
ACM Transactions on Graphics (SIGGRAPH Asia), 2023
Optimized virtual optical waveguides enhance light throughput in scattering media
Adithya Pediredla*, Matteo Giuseppe Scopelliti*, Srinivasa G. Narasimhan, Maysamreza Chamanzar, Ioannis Gkioulekas
Nature Communications, 2023
Efficient Monte Carlo simulation of spatiotemporal speckles and their correlations
Chen Bar, Ioannis Gkioulekas, Anat Levin
Optica, 2023
Walk on stars: A grid-free Monte Carlo method for PDEs with Neumann boundary conditions
Rohan Sawhney*, Bailey Miller*, Ioannis Gkioulekas†, Keenan Crane†
ACM Transactions on Graphics (SIGGRAPH), 2023
Boundary value caching for walk on spheres
Bailey Miller*, Rohan Sawhney*, Keenan Crane†, Ioannis Gkioulekas†
ACM Transactions on Graphics (SIGGRAPH), 2023
Megahertz light steering without moving parts
Adithya Pediredla, Srinivasa G. Narasimhan, Maysamreza Chamanzar, Ioannis Gkioulekas
IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2023
Passive micron-scale time-of-flight with sunlight interferometry
Alankar Kotwal, Anat Levin, Ioannis Gkioulekas
IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2023(highlight)
Swept-angle synthetic wavelength interferometry
Alankar Kotwal, Anat Levin, Ioannis Gkioulekas
IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2023(highlight)
Neural kaleidoscopic space sculpting
Byeongjoo Ahn, Michael De Zeeuw, Ioannis Gkioulekas, Aswin C. Sankaranarayanan
IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2023
Neural implicit surface reconstruction using imaging sonar
Mohamad Qadri, Michael Kaess, Ioannis Gkioulekas
IEEE International Conference on Robotics and Automation (ICRA), 2023
Adjoint nonlinear ray tracing
Arjun Teh, Matthew O'Toole, Ioannis Gkioulekas
ACM Transactions on Graphics (SIGGRAPH), 2022
Fluorescent wavefront shaping using incoherent iterative phase conjugation
Dror Aizik, Ioannis Gkioulekas, Anat Levin
Optica, 2022
Physics-based inverse rendering using combined implicit and explicit geometries
Guangyan Cai, Kai Yan, Zhao Dong, Ioannis Gkioulekas, Shuang Zhao
Computer Graphics Forum (EGSR), 2022
Adaptive gating for single-photon 3D imaging
Po Ryan, Adithya Pediredla, Ioannis Gkioulekas
IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2022(oral)
Reply to: The overwhelming role of ballistic photons in ultrasonically guided light through tissue
Maysamreza Chamanzar, Matteo Giuseppe Scopelliti, Adithya Pediredla, Hengji Huang, Srinivasa G. Narasimhan, Ioannis Gkioulekas, Mohammad-Reza Alam, Michel M. Maharbiz
Nature Communications, 2022
Kaleidoscopic structured light
Byeongjoo Ahn, Ioannis Gkioulekas, Aswin C. Sankaranarayanan
ACM Transactions on Graphics (SIGGRAPH Asia), 2021
Defocus map estimation and deblurring From a single dual-pixel image
Shumian Xin, Neal Wadhwa, Tianfan Xue, Jonathan T. Barron, Pratul Srinivasan, Jiawen Chen, Ioannis Gkioulekas, Rahul Garg
IEEE/CVF International Conference on Computer Vision (ICCV), 2021(oral)
Imaging with local speckle intensity correlations: Theory and practice
Marina Alterman, Chen Bar, Ioannis Gkioulekas, Anat Levin
ACM Transactions on Graphics, 2021
Single scattering modeling of speckle correlation
Chen Bar, Marina Alterman, Ioannis Gkioulekas, Anat Levin
IEEE International Conference on Computational Photography (ICCP), 2021
Overcoming the tradeoff between confinement and focal distance using virtual ultrasonic optical waveguides
Matteo Giuseppe Scopelliti, Hengji Huang, Adithya Pediredla, Srinivasa G. Narasimhan, Ioannis Gkioulekas, Maysamreza Chamanzar
Optics Express, 2020
Path tracing estimators for refractive radiative transfer
Adithya Pediredla, Yasin Karimi Chalmiani, Matteo Giuseppe Scopelliti, Maysamreza Chamanzar, Srinivasa G. Narasimhan, Ioannis Gkioulekas
ACM Transactions on Graphics (SIGGRAPH Asia), 2020
Rendering near-field speckle statistics in scattering media
Chen Bar, Ioannis Gkioulekas, Anat Levin
ACM Transactions on Graphics (SIGGRAPH Asia), 2020
A theory of Fermat paths for 3D imaging sonar reconstruction
Eric Westman, Ioannis Gkioulekas, Michael Kaess
IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), 2020
Langevin Monte Carlo rendering with gradient-based adaptation
Fujun Luan, Shuang Zhao, Kavita Bala, Ioannis Gkioulekas
ACM Transactions on Graphics (SIGGRAPH), 2020
Path-space differentiable rendering
Cheng Zhang, Bailey Miller, Kai Yan, Ioannis Gkioulekas, Shuang Zhao
ACM Transactions on Graphics (SIGGRAPH), 2020
Interferometric transmission probing with coded mutual intensity
Alankar Kotwal, Anat Levin, Ioannis Gkioulekas
ACM Transactions on Graphics (SIGGRAPH), 2020
Effect of geometric sharpness on translucent material perception
Bei Xiao, Shuang Zhao, Ioannis Gkioulekas, Wenyan Bi, Kavita Bala
Journal of Vision (JOV), 2020
A volumetric albedo framework for 3D imaging sonar reconstruction
Eric Westman, Ioannis Gkioulekas, Michael Kaess
IEEE International Conference on Robotics and Automation (ICRA), 2020
Towards reflectometry from interreflections
Kfir Shem-Tov*, Sai Praveen Bangaru*, Anat Levin, Ioannis Gkioulekas
IEEE International Conference on Computational Photography (ICCP), 2020
Towards learning-based inverse subsurface scattering
Chengqian Che, Fujun Luan, Shuang Zhao, Kavita Bala, Ioannis Gkioulekas
IEEE International Conference on Computational Photography (ICCP), 2020
Convolutional approximations to the general non-line-of-sight imaging operator
Byeongjoo Ahn, Akshat Dave, Ashok Veeraraghavan, Ioannis Gkioulekas, Aswin C. Sankaranarayanan
IEEE/CVF International Conference on Computer Vision (ICCV), 2019(oral)
A differential theory of radiative transfer
Cheng Zhang, Lifan Wu, Changxi Zheng, Ioannis Gkioulekas, Ravi Ramamoorthi, Shuang Zhao
ACM Transactions on Graphics (SIGGRAPH Asia), 2019
Ellipsoidal path connections for time-gated rendering
Adithya Pediredla, Ashok Veeraraghavan, Ioannis Gkioulekas
ACM Transactions on Graphics (SIGGRAPH), 2019
A Monte Carlo framework for rendering speckle statistics in scattering media
Chen Bar, Marina Alterman, Ioannis Gkioulekas, Anat Levin
ACM Transactions on Graphics (SIGGRAPH), 2019
A theory of Fermat paths for non-line-of-sight shape reconstruction
Shumian Xin, Sotiris Nousias, Kiriakos N. Kutulakos, Aswin C. Sankaranarayanan, Srinivasa G. Narasimhan, Ioannis Gkioulekas
IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2019(best paper award)
Beyond volumetric albedo—A surface optimization framework for non-line-of-sight imaging
Chia-Yin Tsai, Aswin C. Sankaranarayanan, Ioannis Gkioulekas
IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2019
An evaluation of computational imaging techniques for heterogeneous inverse scattering
Ioannis Gkioulekas, Anat Levin, Todd Zickler
European Conference on Computer Vision (ECCV), 2016(highlight)
Micron-scale light transport decomposition using interferometry
Ioannis Gkioulekas, Anat Levin, Frédo Durand, Todd Zickler
ACM Transactions on Graphics (SIGGRAPH), 2015
On the appearance of translucent edges
Ioannis Gkioulekas, Bruce Walter, Edward H. Adelson, Kavita Bala, Todd Zickler
IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 2015
Looking against the light: How perception of translucency depends on lighting direction
Bei Xiao, Bruce Walter, Ioannis Gkioulekas, Todd Zickler, Edward H. Adelson, Kavita Bala
Journal of Vision (JOV), 2014
Inverse volume rendering with material dictionaries
Ioannis Gkioulekas, Shuang Zhao, Kavita Bala, Todd Zickler, Anat Levin
ACM Transactions on Graphics (SIGGRAPH Asia), 2013
Understanding the role of phase function in translucent appearance
Ioannis Gkioulekas, Bei Xiao, Shuang Zhao, Edward H. Adelson, Todd Zickler, Kavita Bala
ACM Transactions on Graphics, 2013
Effects of shape and color on the perception of translucency
Bei Xiao, Ioannis Gkioulekas, Asher Dunn, Shuang Zhao, Todd Zickler, Edward H. Adelson, Kavita Bala
Vision Science Society Annual Meeting (VSS), 2012
Toward wide-angle microvision sensors
Sanjeev J. Koppal, Ioannis Gkioulekas, Travis Young, Hyunsung Park, Kenneth B. Crozier, Geoffrey L. Barrows, Todd Zickler
IEEE Transactions on Pattern Analysis and Machine Intelligence (PAMI), 2013
Dimensionality reduction using the sparse linear model
Ioannis Gkioulekas, Todd Zickler
Advances in Neural Information Processing Systems (NIPS), 2011
Wide-angle micro sensors for vision on a tight budget
Sanjeev J. Koppal, Ioannis Gkioulekas, Todd Zickler, Geoffrey L. Barrows
IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 2011(oral)
Spatial Bayesian surprise for image saliency and quality assessment
Ioannis Gkioulekas, Giorgos Evangelopoulos, Petros Maragos
IEEE International Conference on Image Processing (ICIP), 2010
Teaching
15-463, 15-663, 15-862 Computational photography
Instructor, CMU, 2017 - present
15-468, 15-668, 15-868 Physics-based rendering
Instructor, CMU, 2021 - present
Computational interferometric imaging
Organizer, SIGGRAPH 2023 course
Physics-based rendering and its applications in computational photography and imaging
Organizer, CVPR 2023 tutorial
Physics-based differentiable rendering
Organizer, CVPR 2021 tutorial
16-385 Computer vision
Instructor, CMU, 2018 - 2020
CS283 Computer vision
Teaching fellow, Harvard, 2010, 2012 - 2015
Writing
Take a read through my technical writing suggestions, which draw a lot of inspiration from Wojciech Jarosz's common mistakes in technical writing.
Code
Visit the CMU Computational Imaging GitHub account for code for projects at CMU. You can find code for some older projects at my personal GitHub account. I use these coding and style conventions in all of my projects.