Research Publications

Books

  1. Computational Imaging [WebLink] [PDF Copy]
    Ayush Bhandari, Achuta Kadambi and Ramesh Raskar
    MIT Press, 2022.

    ISBN: 9780262046473

Journals

  1. Fourier-Domain Inversion for the Modulo Radon Transform
    Matthias Beckmann, Ayush Bhandari and Meira Iske
    IEEE Transactions on Computational Imaging, (Apr. 2024).

  2. Sparse Sampling in Fractional Fourier Domain: Recovery Guarantees and Cramér–Rao Bounds
    Václav Pavlíček and Ayush Bhandari
    IEEE Signal Processing Letters, (May. 2024).

  3. \(\lambda\)-MIMO: Massive MIMO via Modulo Sampling
    Ziang Liu, Ayush Bhandari and Bruno Clerckx
    IEEE Transactions on Communications, (Aug. 2023).

  4. Unlimited Sampling of Bandpass Signals: Computational Demodulation via Undersampling
    Gal Shtendel, Dorian Florescu and Ayush Bhandari
    IEEE Transactions on Signal Processing, (Sep. 2023).

  5. The Modulo Radon Transform: Theory, Algorithms, and Applications
    Matthias Beckmann, Ayush Bhandari and Felix Krahmer
    SIAM Journal on Imaging Sciences, (Apr. 2022).

  6. Back in the US-SR: Unlimited Sampling and Sparse Super-Resolution with its Hardware Validation
    Ayush Bhandari
    IEEE Signal Processing Letters, (Mar. 2022).

  7. The Surprising Benefits of Hysteresis in Unlimited Sampling: Theory, Algorithms and Experiments
    Dorian Florescu, Felix Krahmer and Ayush Bhandari
    IEEE Transactions on Signal Processing, (Jan. 2022).

  8. Unlimited Sampling from Theory to Practice: Fourier-Prony Recovery and Prototype ADC
    Ayush Bhandari, Felix Krahmer and Thomas Poskitt
    IEEE Transactions on Signal Processing, (Sep. 2021).

  9. Computational Array Signal Processing via Modulo Non-Linearities
    Samuel Fernandez-Menduina, Felix Krahmer, Geert Leus and Ayush Bhandari
    IEEE Transactions on Signal Processing, (Jul. 2021).

  10. One-Bit Time-Resolved Imaging
    Ayush Bhandari, Miguel Heredia Conde and Otmar Loffeld
    IEEE Transactions on Pattern Analysis and Machine Intelligence, (Jul. 2020).

    (Best Paper Award at IEEE Intl. Conf. on Computational Photography, 2020)

  11. On Unlimited Sampling and Reconstruction
    Ayush Bhandari, Felix Krahmer and Ramesh Raskar
    IEEE Transactions on Signal Processing, (Dec. 2020).

  12. Computational Array Signal Processing
    Samuel Fernandez-Menduina, Felix Krahmer, Geert Leus and Ayush Bhandari
    (submitted to) IEEE Transactions on Signal Processing, (Aug. 2020).

  13. Sampling and Super Resolution of Sparse Signals Beyond the Fourier Domain
    Ayush Bhandari and Yonina Eldar
    IEEE Transactions on Signal Processing, (Mar. 2019).

  14. Shift-invariant and Sampling Spaces Associated with the Special Affine Fourier Transform
    Ayush Bhandari and Ahmed Zayed
    Applied and Computational Harmonic Analysis, (Jul. 2019).

  15. Signal Processing for Time-of-Flight Imaging Sensors: An introduction to inverse problems in computational 3-D imaging
    Ayush Bhandari and Ramesh Raskar
    IEEE Signal Processing Magazine, (Sep. 2016).

  16. Resolving Multipath Interference in Kinect: An Inverse Problem Approach
    Micha Feigin, Ayush Bhandari, Shahram Izadi, Christoph Rhemann, Mirko Schmidt and Ramesh Raskar
    IEEE Sensors Journal, (May. 2016).

  17. Blind and Reference-free Fluorescence Lifetime Estimation Via Consumer Time-of-flight Sensors
    Ayush Bhandari, Christopher Barsi and Ramesh Raskar
    Optica, (Nov. 2015).

  18. Modeling ‘‘wiggling’’ As a Multi-path Interference Problem in AMCW ToF Imaging
    Micha Feigin, Refael Whyte, Ayush Bhandari, Adrian Dorington and Ramesh Raskar
    Optics Express, (Jul. 2015).

  19. Resolving Multipath Interference in Time-of-flight Imaging Via Modulation Frequency Diversity and Sparse Regularization
    Ayush Bhandari, Achuta Kadambi, Refael Whyte, Christopher Barsi, Micha Feigin, Adrian Dorrington and Ramesh Raskar
    Optics Letters, (Mar. 2014).

  20. Coded Time of Flight Cameras: Sparse Deconvolution to Address Multipath Interference and Recover Time Profiles
    Achuta Kadambi, Refael Whyte, Ayush Bhandari, Lee Streeter, Christopher Barsi, Adrian Dorrington and Ramesh Raskar
    ACM Transactions on Graphics, (Nov. 2013).

  21. Shift-Invariant and Sampling Spaces Associated With the Fractional Fourier Transform Domain
    Ayush Bhandari and Ahmed Zayed
    IEEE Transactions on Signal Processing, (Apr. 2012).

  22. Sampling and Reconstruction of Sparse Signals in Fractional Fourier Domain
    Ayush Bhandari and Pina Marziliano
    IEEE Signal Processing Letters, (Mar. 2010).

  23. Fractional Delay Filters Based on Generalized Cardinal Exponential Splines
    Ayush Bhandari and Pina Marziliano
    IEEE Signal Processing Letters, (Mar. 2010).

Conferences

  1. Dual-Channel Unlimited Sampling for Bandpass Signals
    Gal Shtendel and Ayush Bhandari
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Apr. 2024).

  2. Frequency Estimation via Sub-Nyquist Unlimited Sampling
    Yuliang Zhu, Ruiming Guo, Peiyu Zhang and Ayush Bhandari
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Apr. 2024).

  3. Unlimited Sampling Radar: Life Below the Quantization Noise
    Thomas Feuillen, Bhavani Shankar and Ayush Bhandari
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Jun. 2023).

  4. ITER-SIS: Robust Unlimited Sampling Via Iterative Signal Sieving
    Ruiming Guo and Ayush Bhandari
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Jun. 2023).

  5. Unlimited Sampling of FRI Signals Independent of Sampling Rate
    Ruiming Guo and Ayush Bhandari
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Jun. 2023).

  6. Unlimited Sampling in Phase Space
    Peiyu Zhang and Ayush Bhandari
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Jun. 2023).

  7. Unlimited Sampling with Sparse Outliers: Experiments with Impulsive and Jump or Reset Noise
    Ayush Bhandari
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (May. 2022).

  8. Unlimited Sampling for FMCW Radars: A Proof of Concept
    Thomas Feuillen, Mohammad Alaee-Kerahroodi, Ayush Bhandari, Bhavani Shankar M. R and Bjorn Ottersten
    IEEE Radar Conference (RadarConf22), (Mar. 2022).

  9. Unlimited Sampling with Local Averages
    Dorian Florescu and Ayush Bhandari
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (May. 2022).

  10. Modulo Event-driven Sampling: System Identification and Hardware Experiments
    Dorian Florescu and Ayush Bhandari
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (May. 2022).

  11. Unlimited Sampling with Hysteresis
    Dorian Florescu, Felix Krahmer and Ayush Bhandari
    55th Asilomar Conf. on Signals, Systems, and Computers, (Oct. 2021).

  12. Event-Driven Modulo Sampling
    Dorian Florescu, Felix Krahmer and Ayush Bhandari
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Jun. 2021).

  13. HDR Tomography via Modulo Radon Transform
    Matthias Beckmann, Felix Krahmer and Ayush Bhandari
    IEEE Intl. Conf. on Image Processing (ICIP), (Oct. 2020).

  14. The Modulo Radon Transform and Its Inversion
    Ayush Bhandari, Matthias Beckmann and Felix Krahmer
    European Signal Processing Conference (EUSIPCO), (Oct. 2020).

  15. One-Bit Sampling in Fractional Fourier Domain
    Ayush Bhandari, Olga Graf, Felix Krahmer and Ahmed Zayed
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (May. 2020).

  16. HDR Imaging From Quantization Noise
    Ayush Bhandari and Felix Krahmer
    IEEE Intl. Conf. on Image Processing (ICIP), (Oct. 2020).

  17. Multidimensional Unlimited Sampling: A Geometrical Perspective
    Vincent Bouis, Felix Krahmer and Ayush Bhandari
    European Signal Processing Conference (EUSIPCO), (Oct. 2020).

  18. DoA Estimation Via Unlimited Sensing
    Samuel Fernandez-Menduina, Felix Krahmer, Geert Leus and Ayush Bhandari
    European Signal Processing Conference (EUSIPCO), (Oct. 2020).

  19. Rethinking Super-resolution: The Bandwidth Selection Problem
    Dmitry Batenkov, Ayush Bhandari and Thierry Blu
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (May. 2019).

  20. On Identifiability in Unlimited Sampling
    Ayush Bhandari and Felix Krahmer
    Intl. Conf. on Sampling Theory and Applications (SampTA), (Jul. 2019).

  21. One-bit Unlimited Sampling
    Olga Graf, Ayush Bhandari and Felix Krahmer
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (May. 2019).

    (Best Student Paper Award)

  22. Unlimited Sampling of Sparse Sinusoidal Mixtures
    Ayush Bhandari, Felix Krahmer and Ramesh Raskar
    IEEE Intl. Sym. on Information Theory (ISIT), (Jun. 2018).

  23. FRI Sampling and Time-varying Pulses: Some Theory and Four Short Stories
    Ayush Bhandari and Thierry Blu
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Mar. 2017).

  24. Sampling without time: Recovering echoes of light via temporal phase retrieval
    Ayush Bhandari, Aurelien Bourquard and Ramesh Raskar
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Mar. 2017).

  25. On Unlimited Sampling
    Ayush Bhandari, Felix Krahmer and Ramesh Raskar
    International Conference on Sampling Theory and Applications (SampTA), (Jul. 2017).

  26. Time-resolved Image Demixing
    Ayush Bhandari, Aurelien Bourquard, Shahram Izadi and Ramesh Raskar
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Mar. 2016).

  27. A Swiss Army Knife for Finite Rate of Innovation Sampling Theory
    Ayush Bhandari and Yonina Eldar
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Mar. 2016).

  28. Super-resolved Time-of-flight Sensing Via FRI Sampling Theory
    Ayush Bhandari, Andrew M. Wallace and Ramesh Raskar
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Mar. 2016).

  29. Super-resolution in Phase Space
    Ayush Bhandari, Yonina Eldar and Ramesh Raskar
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Apr. 2015).

  30. Coded Time-of-Flight Imaging for Calibration Free Fluorescence Lifetime Estimation
    Ayush Bhandari, Christopher Barsi, Refael Whyte, Achuta Kadambi, Anshuman J. Das, Adrian Dorrington and Ramesh Raskar
    Imaging and Applied Optics 2014, ( 2014).

  31. Resolving Multipath Interference in Kinect: An Inverse Problem Approach
    Ayush Bhandari, Micha Feigin, Shahram Izadi, Christoph Rhemann, Mirko Schmidt and Ramesh Raskar
    IEEE Sensors, (Nov. 2014).

  32. Sparse Linear Operator identification without sparse regularization? Applications to mixed pixel problem in Time-of-Flight Range imaging
    Ayush Bhandari, Achuta Kadambi and Ramesh Raskar
    IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (May. 2014).

  33. Demultiplexing Illumination Via Low Cost Sensing and Nanosecond Coding
    Achuta Kadambi, Ayush Bhandari, Refael Whyte, Adrian Dorrington and Ramesh Raskar
    IEEE International Conference on Computational Photography (ICCP), (May. 2014).

  34. Need for speed: Fast Stockwell transform (FST) with \(\mathcal O (N)\) complexity
    Ayush Bhandari, Pina Marziliano and Arrate Munoz Barrutia
    2009 7th International Conference on Information, Communications and Signal Processing (ICICS), (Dec. 2009).

Theses

  1. Sampling Time-resolved Phenomena
    PhD Thesis, Massachusetts Institute of Technology, 2018.
    Ayush Bhandari

    Thesis Committee: Profs. Ramesh Raskar (MIT), Laurent Demanet (MIT), Felix Krahmer (TU Munich) and Laurent Daudet (Institut Langevin, ESPCI Paris)

  2. Inverse Problems in Time-of-flight Imaging: Theory, Algorithms and Applications
    Master's Thesis, Massachusetts Institute of Technology, 2014.
    Ayush Bhandari

Book Chapters

  1. Convolution and Product Theorems for the Special Affine Fourier Transform
    Ayush Bhandari and Ahmed Zayed
    Frontiers in Orthogonal Polynomials and q-Series, (Jan. 2018).

  2. Computer Vision and Machine Learning with RGB-D Sensors
    Achuta Kadambi, Ayush Bhandari and Ramesh Raskar
    Computer Vision and Machine Learning with RGB-D Sensors, ( 2014).

Patents

  1. Undisclosed Method for Sensor Array Processing
    Ayush Bhandari, Samuel Fernandez-Menduina, Felix Krahmer and Geert Leus
    Not Assigned, ( 2020).
    Assignee: Imperial College London

  2. Methods and Apparatus for Modulo Sampling and Recovery
    Ayush Bhandari, Felix Krahmer and Ramesh Raskar
    US10651865B2, (May. 2020).
    Assignee: Massachusetts Institute of Technology

  3. Methods and Apparatus for Fluorescence Lifetime Imaging with Periodically Modulated Light
    Ayush Bhandari, Christopher Barsi, Achuta Kadambi and Ramesh Raskar
    US10337993B2, (Jul. 2019).
    Assignee: Massachusetts Institute of Technology

  4. Methods and Apparatus for Fluorescence Lifetime Imaging with Pulsed Light
    Ayush Bhandari, Christopher Barsi, Achuta Kadambi and Ramesh Raskar
    US10190983B2, (Jan. 2019).
    Assignee: Massachusetts Institute of Technology

  5. Methods and Apparatus for Time-of-flight Imaging
    Achuta Kadambi, James Schiel, Ayush Bhandari, Ramesh Raskar and Vage Taamazyan
    US10191154B2, (Jan. 2019).
    Assignee: Massachusetts Institute of Technology

  6. Methods and Apparatus for Virtual Sensor Array
    Achuta Kadambi, Hang Zhao, Boxin Shi, Ayush Bhandari and Ramesh Raskar
    US9897699B2, (Feb. 2018).
    Assignee: Massachusetts Institute of Technology

  7. Methods and Apparatus for Gigahertz Time-of-Flight Imaging
    Achuta Kadambi, Tomohiro Maeda, Ayush Bhandari, Barmak Heshmat Dehkordi and Ramesh Raskar
    US20190101631A1, (Sep. 2017).
    Assignee: Massachusetts Institute of Technology

  8. Methods and Apparatus for Coded Time-of-flight Camera
    Achuta Kadambi, Refael Whyte, Ayush Bhandari, Lee Streeter, Christopher Barsi, Adrian Dorrington and Ramesh Raskar
    US9778363B2, ( 2017).
    Assignee: Massachusetts Institute of Technology

  9. Methods and Apparatus for Demultiplexing Illumination
    Achuta Kadambi, Ayush Bhandari and Ramesh Raskar
    US9451141B2, (Sep. 2016).
    Assignee: Massachusetts Institute of Technology

  10. Methods and Apparatus for Multi-frequency Camera
    Ramesh Raskar, Achuta Kadambi, Ayush Bhandari and Christopher Barsi
    US9405008B2, (Aug. 2016).
    Assignee: Massachusetts Institute of Technology

Technology Demos

  1. Sub-Nyquist Frequency Estimation via Multi-Channel Unlimited Sampling ADCs
    Ayush Bhandari, Yuliang Zhu and Ruiming Guo
    Show & Tell Demo in IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Apr. 2024).

  2. Extreme High Dynamic Range Unlimited Sensing
    Ayush Bhandari and Yuliang Zhu
    Show & Tell Demo in IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Apr. 2024).

  3. Computational Radar via Multi-Channel Unlimited Sampling
    Thomas Feuillen and Ayush Bhandari
    Show & Tell Demo in IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Apr. 2024).

  4. Multi-Channel, Variable-Threshold Unlimited Sensing Hardware and Applications
    Ayush Bhandari and Yuliang Zhu
    Show & Tell Demo in IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Jun. 2023).

  5. Unlimited Sampling Radar: A Real-Time End-to-End Demonstrator
    Thomas Feuillen, Bhavani Shankar Mysore Ramarao and Ayush Bhandari
    Show & Tell Demo in IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Jun. 2023).

  6. FMCW Radar via Unlimited Sampling: From Theory to Practice
    Thomas Feuillen, Ayush Bhandari, Mohammad Alaee-Kerahroodi, Bhavani Shankar MRR and Bjorn Ottersten
    Show & Tell Demo in IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (May. 2022).

  7. Unlimited Sensing: An Invitation to Modulo Sampling and Painless HDR Reconstruction beyond Shannon
    Ayush Bhandari
    Show & Tell Demo in IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP), (Jun. 2021).