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Publications

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2020

  1. Adaptive Fovea for Scanning Depth Sensors
    International Journal of Robotics Research, 2020
    Z. Tasneem, C. Adhivarahan, D. Wang, H. Xie, K. Dantu and S. J. Koppal

    PDF Coming Soon
  2. A MEMS-Based Foveating Lidar to Enable Real-Time Adaptive Depth Sensing
    arxiv 2020
    F. Pittaluga, Z. Tasneem, J. Folden, B. Tilmon, A. Chakrabarti and S. J. Koppal

    PDF
  3. FoveaCam: A MEMS Mirror-Enabled Foveating Camera
    ICCP 2020
    B. Tilmon, E. Jain, S. Ferrari, and S. J. Koppal

    PDF Coming Soon
  4. Design and Calibration of a Fast Flying-Dot Projector for Dynamic Light Transport Acquisition
    Transactions on Computational Imaging 2020
    K. Henderson, X. Liu, J. Folden, B. Tilmon, S. Jayasuriya, and S. J. Koppal

    PDF
  5. Proximity-based Sensor Fusion of Depth Cameras and Isotropic Rad-detectors
    Transactions on Nuclear Science 2020
    K. Henderson, X. Liu, K. Stadnikia, A. Martin, A. Enqvist, and S. J. Koppal

    PDF
  6. The Security-Utility Trade-off for Iris Authentication and Eye Animation for Social Virtual Avatars
    IEEE VR 2020
    B. John, S. Joerg, S.J. Koppal and E. Jain

    PDF

2019

  1. A Compact Omnidirectional Laser Scanner Based on an Electrothermal Tripod MEMS Mirror for LiDAR
    Transducers 2019
    D. Wang, C. Watkins, S. J. Koppal, M. Li, Y. Ding and H. Xie

    PDF
  2. A Large Aperture 2-Axis Electrothermal MEMS Mirror for Compact 3-D LiDAR
    2019 International Conference on Optical MEMS and Nanophotonics
    D. Wang, C. Watkins, M. Aradhya, S. J. Koppal and H. Xie

    PDF
  3. Revealing Scenes by Inverting Structure from Motion Reconstructions
    Best Paper Finalist
    CVPR 2019
    F. Pittaluga, S. J. Koppal, S. Kang and S. Sinha

    project page | PDF
  4. EyeVEIL: Degrading Iris Authentication in Eye-Tracking Headsets
    ETRA 2019
    B. John, S. J. Koppal and E. Jain

    project page (Coming Soon) | PDF
  5. Learning Privacy Preserving Encodings through Adversarial Training
    WACV 2019
    F. Pittaluga, S. J. Koppal, A. Chakrabarti

    project page | PDF

2018

  1. Directionally Controlled Time-of-Flight Ranging for Mobile Sensing Platforms
    RSS 2018
    Z. Tasneem, D. Wang, H. Xie and S. J. Koppal

    project page | PDF
  2. An Integrated Forward-View 2-Axis MEMS Scanner for Compact 3D LIDAR
    Winner of Best Student Paper Award
    NEMS 2018
    D.Wang*, S. S. Rojas, Al. Shuping, Z. Tasneem, S. J. Koppal, H. Xie*

    PDF
  3. A Compact 3D LIDAR Based on an Electrothermal Two-Axis MEMS Scanner for Small UAV
    SPIE 2018
    D. Wang, S. Strassle, A. Stainsby, Y. Bai, S. J. Koppal, et al.

     PDF
  4. Designing Light Filters to Detect Skin Using a Low-powered Sensor
    SoutheastCon 2018
    M. U. Tariq, A. K. Ghosh, K. Badillo-Urquiola, A. Jha, S. J. Koppal, and P. J. Wisniewski

     PDF
  5. Data Fusion for a Vision-Aided Radiological Detection System: Calibration Algorithm Performance
    Nuclear Instruments and Methods in Physics A
    K. Stadnikia, K. Henderson, A. Martin, P. Riley, S. J. Koppal, A. Enqvist

    PDF – Coming Soon

2017

  1. Tracking Radioactive Sources through Sensor Fusion of Omnidirectional LIDAR and Isotropic Rad-detectors
    3DV 2017
    K. Henderson, K. Stadnikia, A. Martin, A. Enqvist, and S. J. Koppal

    project page | PDF
  2. Focal Flow: Velocity and Depth from Differential Defocus through Motion
    IJCV 2017
    E. Alexander, Q. Guo, S. J. Koppal, S.J. Gortler, and T. Zickler
    PDF

  3. Situational Information Guidance for Revised Detection Limits
    Nuclear Science Symposium/Medical Imaging Conference 2017
    K. Stadnikia, K. Henderson, S. J. Koppal and A. Enqvist

    project page | PDF – Coming soon
  4. A Compact MEMS-Based Wide-Angle Optical Scanner
    OMN 2017
    B. Yang, L. Zhou, X. Zhang, D. Wang, S. J. Koppal and H. Xie
    PDF

  5. Creating Segments and Effects on Comics by Clustering Gaze Data
    Transactions on Multimedia Computing (TOMM), 2017
    I. Thirunarayan, K. Khetarpal, S.J. Koppal, O. LeMeur, J. Shea, E. Jain

    project page | PDF
  6. Pre-Capture Privacy for Small Vision Sensors
    IEEE Transactions on Pattern Analysis and Machine Intelligence, 2017
    F. Pittaluga and S.J. Koppal

    project page | PDF

2016

  1. Focal Flow: Measuring Distance and Velocity with Defocus and Differential Motion.
    Winner of Best Student Paper Award
    European Conference on Computer Vision, 2016.
    E. Alexander, Q. Guo, S.J. Koppal, S.J. Gortler, and T. Zickler

    PDF
  2. Leveraging Gaze Data for Segmentation and Effects on Comics.
    ACM Symposium on Applied Perception Poster, 2016.
    I. Thirunarayanan, S. J. Koppal, J. Shea, E. Jain

    project page | PDF
  3. A Survey of Computational Photography in the Small.
    IEEE Signal Processing Magazine, 2016.
    S. J. Koppal

     PDF
  4. A Wide-angle Immersed MEMS Mirror and Its Application in Optical Coherence Tomography.
    International Conference on Optical MEMS and Nanophotonics, 2016.
    X. Zhang, L. Zhou, C. Duan, D. Zheng, S. J. Koppal, and H. Xie

    project page | PDF
  5. Sensor-level Privacy for Thermal Cameras.
    International Conference on Computational Photography, 2016.
    F. Pittaluga, A. Zivkovic and S. J. Koppal

    project page | PDF
  6. Wide-angle Structured Light with a Scanning MEMS Mirror in Liquid.
    Optics Express 2016.
    X. Zhang, S. J. Koppal, R. Zhang, L. Zhou, E. Butler, and H. Xie

    project page | PDF

2015

  1. Low Power Depth and Velocity from a Passive Moving Sensors, 2015.
    Extreme Imaging Workshop 2015.
    E. Alexander, S. J. Koppal and T. Zickler

    pdf
  2. Low-Cost Depth and Radiological Sensor Fusion to Detect Moving Sources
    3DV, 2015.
    P. Riley, A. Enqvist and S. J. Koppal

    project page | pdf
  3. Privacy Preserving Optics for Miniature Vision Sensors
    Conference on Computer Vision and Pattern Recognition, 2015.
    F. Pittaluga and S. J. Koppal

    project page | pdf
  4. Data Fusion for a Vision-Radiological System for Source Tracking and Discovery
    Advancements in Nuclear Instrumentation Measurement Methods and their Applic., 2015.
    A. Enqvist and S. J. Koppal

    project page
  5. Generalized Assorted Camera Arrays: Robust Cross-channel Registration and Applic.
    Transactions on Image Processing, 2015.
    J. Holloway, K. Mitra, S. J. Koppal and A. Veeraraghavan

    project page | pdf
  6. MEMS Mirrors Submerged in Liquid for Wide-angle Scanning
    International Conference on Solid-State Sensors, Actuators and Microsystems, 2015.
    X. Zhang, R. Zhang, S. J. Koppal, L. Butler, X. Cheng and H. Xie

    project page | pdf
  7. Beyond Perspective Dual Photography with Illumination Masks
    Transactions on Image Processing, 2015.
    S. J. Koppal and S. G. Narasimhan

    project page | pdf

2013

  1. Towards wide-angle micro vision sensors
    Transactions on Pattern Analysis and Machine Intelligence, 2013.
    Invited paper for special issue
    S. J. Koppal, I. Gkioulekas, T. Young, H. Park, K. Crozier, G. Barrows and T. Zickler

    project page | pdf

2012

  1. A low-power structured light sensor for outdoor scene reconstruction and dominant material identification
    International Workshop on Projector-Camera Systems, 2012.
    C. Mertz, S. J. Koppal, S. Sia and S. G. Narasimhan

    project page | pdf

2011

  1. Exploiting DLP illumination dithering for reconstruction and photography of high-speed scenes
    International Journal on Computer Vision, 2011.
    S. J. Koppal, S. Yamazaki and S. G. Narasimhan

    project page | pdf
  2. A viewer-centric editor for stereoscopic cinema
    IEEE Computer Graphics and Applications, 2011.
    S. J. Koppal, L. Zitnick, M. Cohen, S. Kang, B. Ressler and A. Colburn

    project page | pdf
  3. Wide-angle micro sensors for vision on a tight budget
    Conference on Computer Vision and Pattern Recognition, 2011.
    Oral Presentation, 4% acceptance rate
    S. J. Koppal, I. Gkioulekas, T. Zickler and G. Barrows

    project page | pdf

2009

  1. Shadow cameras: Reciprocal views from illumination masks
    International Conference on Computer Vision, 2009.
    Poster Presentation, 20% acceptance rate
    S. J. Koppal and S. G. Narasimhan

    project page | pdf

2008

  1. Temporal dithering of illumination for fast active vision
    European Conference on Computer Vision, 2008.
    Oral Presentation, 4% acceptance rate
    S. G. Narasimhan, S. J. Koppal and S. Yamazaki

    project page | pdf
  2. Illustrating motion through DLP photography
    International Workshop on Projector-Camera Systems, 2008.
    S. J. Koppal and S. G. Narasimhan

    project page | pdf
  3. Appearance derivatives for iso-normal clustering of scenes
    Transactions on Pattern Analysis and Machine Intelligence, 2008.
    S. J. Koppal and S. G. Narasimhan

    project page | pdf

2007

  1. Novel depth cues from uncalibrated near-field lighting
    International Conference on Computer Vision, 2007.
    Poster Presentation, 20% acceptance rate
    S. J. Koppal and S. G. Narasimhan

    project page | pdf

2006

  1. Clustering appearance for scene analysis
    Conference on Computer Vision and Pattern Recognition, 2006.
    Oral Presentation, 4% acceptance rate
    S. J. Koppal and S. G. Narasimhan

    project page | pdf
  2. Taylor series of appearance functions
    CMU-Robotics Institute Technical report, 2006.
    S. J. Koppal, A. Datta, S. G. Narasimhan and K. Nishino

2005

  1. Structured light from scattering media
    International Conference on Computer Vision, 2005.
    Oral Presentation, 4% acceptance rate
    S. G. Narasimhan, S. K. Nayar, B. Sun and S. J. Koppal

    project page