2026-09-19T09:08:16Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/1270152026-06-16T18:54:25Zcom_1721.1_7582com_1721.1_7581col_1721.1_131022
Jeffrey H. Shapiro.
Dove, Justin(Justin Michael)
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science.
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
2020-09-03T17:41:58Z
2020-09-03T17:41:58Z
2020
2020
https://hdl.handle.net/1721.1/127015
1191624426
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, May, 2020
Cataloged from the official PDF of thesis.
Includes bibliographical references (pages 141-143).
Phasor-field (P-field) imaging is a promising recent solution to the task of non-line-of-sight (NLoS) imaging, colloquially referred to as "seeing around corners". It consists of treating the oscillating envelope of amplitude-modulated, spatially-incoherent light as if it were itself an optical wave, akin to the oscillations of the underlying electro- magnetic field. We present a formal analysis of P-field propagation using paraxial wave optics and demonstrate how it can be used to form images of hidden diffuse targets both computationally and with physical lenses. In both cases, we find that hidden target planes can be imaged at the modulation-wavelength diffraction limit, despite the presence of intervening diffusers. To model propagation through more general scenarios, we introduce the two-frequency spatial Wigner distribution and derive primitives that characterize its behavior. These primitives are used to analyze occlusion-aided imaging scenarios as well as to verify intuitive results in the geometric-optics limit. Consistent with prior work, we find that intervening occluders offer the potential to form convolutional images of hidden target planes, even in the absence of time-of-flight information. Additionally, we demonstrate how to extend our frame-work beyond the paraxial regime and include a thorough exploration of the effects of speckle, which we find are likely manageable in realistic scenarios.
by Justin Dove.
Ph.D.
Ph.D. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science
143 pages
eng
Massachusetts Institute of Technology
MIT theses may be protected by copyright. Please reuse MIT thesis content according to the MIT Libraries Permissions Policy, which is available through the URL provided.
http://dspace.mit.edu/handle/1721.1/7582
Electrical Engineering and Computer Science.
Theory of phasor-field imaging
Thesis
application/pdf
2020-09-03T17:41:58Z
Publication
Doctoral
EECS
unknown
unknown
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<Abstract>Phasor-field (P-field) imaging is a promising recent solution to the task of non-line-of-sight (NLoS) imaging, colloquially referred to as "seeing around corners". It consists of treating the oscillating envelope of amplitude-modulated, spatially-incoherent light as if it were itself an optical wave, akin to the oscillations of the underlying electro- magnetic field. We present a formal analysis of P-field propagation using paraxial wave optics and demonstrate how it can be used to form images of hidden diffuse targets both computationally and with physical lenses. In both cases, we find that hidden target planes can be imaged at the modulation-wavelength diffraction limit, despite the presence of intervening diffusers. To model propagation through more general scenarios, we introduce the two-frequency spatial Wigner distribution and derive primitives that characterize its behavior. These primitives are used to analyze occlusion-aided imaging scenarios as well as to verify intuitive results in the geometric-optics limit. Consistent with prior work, we find that intervening occluders offer the potential to form convolutional images of hidden target planes, even in the absence of time-of-flight information. Additionally, we demonstrate how to extend our frame-work beyond the paraxial regime and include a thorough exploration of the effects of speckle, which we find are likely manageable in realistic scenarios.</Abstract>
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