EDoF-ToF: extended depth of field time-of-flight imaging

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dc.citation.firstpage38540en_US
dc.citation.issueNumber23en_US
dc.citation.journalTitleOptics Expressen_US
dc.citation.lastpage38556en_US
dc.citation.volumeNumber29en_US
dc.contributor.authorTan, Jasperen_US
dc.contributor.authorBoominathan, Viveken_US
dc.contributor.authorBaraniuk, Richarden_US
dc.contributor.authorVeeraraghavan, Ashoken_US
dc.date.accessioned2021-12-02T15:09:26Zen_US
dc.date.available2021-12-02T15:09:26Zen_US
dc.date.issued2021en_US
dc.description.abstractConventional continuous-wave amplitude-modulated time-of-flight (CWAM ToF) cameras suffer from a fundamental trade-off between light throughput and depth of field (DoF): a larger lens aperture allows more light collection but suffers from significantly lower DoF. However, both high light throughput, which increases signal-to-noise ratio, and a wide DoF, which enlarges the system’s applicable depth range, are valuable for CWAM ToF applications. In this work, we propose EDoF-ToF, an algorithmic method to extend the DoF of large-aperture CWAM ToF cameras by using a neural network to deblur objects outside of the lens’s narrow focal region and thus produce an all-in-focus measurement. A key component of our work is the proposed large-aperture ToF training data simulator, which models the depth-dependent blurs and partial occlusions caused by such apertures. Contrary to conventional image deblurring where the blur model is typically linear, ToF depth maps are nonlinear functions of scene intensities, resulting in a nonlinear blur model that we also derive for our simulator. Unlike extended DoF for conventional photography where depth information needs to be encoded (or made depth-invariant) using additional hardware (phase masks, focal sweeping, etc.), ToF sensor measurements naturally encode depth information, allowing a completely software solution to extended DoF. We experimentally demonstrate EDoF-ToF increasing the DoF of a conventional ToF system by 3.6 ×, effectively achieving the DoF of a smaller lens aperture that allows 22.1 × less light. Ultimately, EDoF-ToF enables CWAM ToF cameras to enjoy the benefits of both high light throughput and a wide DoF.en_US
dc.identifier.citationTan, Jasper, Boominathan, Vivek, Baraniuk, Richard, et al.. "EDoF-ToF: extended depth of field time-of-flight imaging." <i>Optics Express,</i> 29, no. 23 (2021) Optical Society of America: 38540-38556. https://doi.org/10.1364/OE.441515.en_US
dc.identifier.digitaloe-29-23-38540en_US
dc.identifier.doihttps://doi.org/10.1364/OE.441515en_US
dc.identifier.urihttps://hdl.handle.net/1911/111728en_US
dc.language.isoengen_US
dc.publisherOptical Society of Americaen_US
dc.rightsPublished under the terms of the under the terms of the OSA Open Access Publishing Agreementen_US
dc.rights.urihttps://www.osapublishing.org/library/license_v1.cfm#VOR-OAen_US
dc.titleEDoF-ToF: extended depth of field time-of-flight imagingen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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