High-Resolution Time-of-Flight imaging

High-Resolution Time-of-Flight imaging

A novel approach to Time-of-Flight imaging based on Multi-Wavelength Interferometry

State of the art Time-of-Flight cameras suffer low depth resolution caused by the technical limitations in electronics manufacturing. High precision Time-of-Flight principles like single-wavelength interferometry are limited to smooth surfaces. We close the gap and solve this problem by applying teachings known from signal processing and multiwavelength interferometry. Paired with focal plane array sensors, our Super-Heterodyne Interferometry principle acquires sub-mm resolution full field 3D data of any surface type within milliseconds. The technique is of interest for a multitude of applications, because it combines the benefits of ToF imaging (compact, no occlusions) with the high resolution of triangulation (‘structured light’) methods.




F. Li*, F. Willomitzer*, M. Balaji, P. Rangarajan, O. Cossairt (* joint first authors)
Exploiting Wavelength Diversity for High Resolution Time-of-Flight 3D Imaging
IEEE International Conference on Computational Photography (ICCP), 2021
[Full Video]
Y. Wu*, F. Li*, F. Willomitzer, A. Veeraraghavan, O. Cossairt (* joint first authors)
WISHED: Wavefront Imaging Sensor with High resolution and Depth ranging
IEEE International Conference on Computational Photography (ICCP), 2020
[Full Video]
F. Willomitzer
Synthetic Wavelength Holography – Imaging around Corners and through Scattering Media at the Physical Space-Bandwidth Limit
Physics Colloquium Talk Series, University Erlangen-Nuremberg, Germany, 2021
[Full Video]

Publications

Exploiting Wavelength Diversity for High Resolution Time-of-Flight 3D Imaging
F. Li*, F. Willomitzer*, M. Balaji, P. Rangarajan, O. Cossairt (* joint first authors).
IEEE Transactions on Pattern Analysis and Machine Intelligence (TPAMI)
[Video (YouTube)]

WISHED: Wavefront Imaging Sensor with High resolution and Depth ranging
Y. Wu*, F. Li*, F. Willomitzer, A. Veeraraghavan, O. Cossairt (* joint first authors).
IEEE International Conference on Computational Photography (ICCP)
[Video (YouTube)]

Wavefront sensing based depth sensor for macroscopic objects
Y. Wu*, F. Li*, F. Willomitzer, A. Veeraraghavan, O. Cossairt (* joint first authors).
OSA Computational Optical Sensing and Imaging

Mega-pixel time-of-flight imager with GHz modulation frequencies
F. Li, F. Willomitzer, P. Rangarajan, O. Cossairt.
OSA Computational Optical Sensing and Imaging, CTh2A. 2

Micro Resolution Time-of-Flight Imaging
F. Li, F. Willomitzer, P. Rangarajan, A. Velten, M. Gupta, O. Cossairt.
OSA Computational Optical Sensing and Imaging, CM2E. 4

SH-ToF: Micro Resolution Time-of-Flight Imaging with Superheterodyne Interferometry
F. Li, F. Willomitzer, P. Rangarajan, A. Velten, M. Gupta, O. Cossairt.
IEEE International Conference on Computational Photography (ICCP)

Synthetic Wavelength Holography: Snapshot Non-Line-of-Sight Imaging with High-Resolution and Wide Field of View
F. Willomitzer, P. Rangarajan, F. Li, M. Balaji, M. Christensen, O. Cossairt.
Accepted in Nature Communications (Preprint on Research Square)

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Florian Willomitzer
Research Assistant Professor