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Three-Dimensional Non-Line-of-Sight Imaging with High Resolution using Superheterodyne Remote Digital Holography |
F. Willomitzer1, F. Li1, M. Madabhushi-Balaji2, P. Rangarajan2, O. Cossairt1
1Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208, USA
2Department of Electrical Engineering, Southern Methodist University, Dallas, TX 75205, USA
florian.willomitzer@northwestern.edu |
Non-Line-of-Sight (NLoS) imaging has recently emerged as a new and exciting challenge in the computational imaging community. The goal is to produce an image of objects hidden from direct view solely by observing light reflected by scattering surfaces that are visible to the camera. Robust solutions could enable unprecedented possibilities, e.g., in autonomous driving, medical imaging, or machine vision applications.
Active NLoS techniques must accommodate for scattering on at least three rough surfaces, resulting in a scrambling of optical phase information and extremely dim acquired signals. State-of-the-art approaches exploit time-of-flight information from ultrashort light pulses, measured with fast point-detectors. This requires raster-scanning and produces resolutions which leave much room for improvement.
We present a novel continuous-wave approach to NLoS imaging that borrows ideas from Remote Digital Holography and Multi-Wavelength Interferometry and avoids raster scanning by utilizing the latest focal plane array technology. Our 3D reconstructions of the hidden volume reach a precision of a few mm, which by far surpasses the resolution of conventional methods.
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Keywords:
Kohärenz, Speckle, Holografie |
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