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公开(公告)号：US20250012953A1
公开(公告)日：2025-01-09
申请号：US18674190
申请日：2024-05-24
Applicant: Northern Digital Inc.
Inventor： Shaulaine White , Derek Peter Zwambag , Larry Chen , Athanasios Tommy Balkos
IPC: G02B5/124
Abstract: An apparatus including a retro-reflective section. The retro-reflective section includes an outer surface, an inner surface, and a plurality of retro-reflective microelement. One or more of the plurality of retro-reflective microelements include a plurality of reflective surfaces. Each of the plurality of retro-reflective microelements extends from the inner surface at a location different from locations of the other retro-reflective microelements, and each of the plurality of retro-reflective microelements comprises a central axis extending along a direction that corresponds to a surface normal of the outer surface.
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公开(公告)号：US20220096168A1
公开(公告)日：2022-03-31
申请号：US17485081
申请日：2021-09-24
Applicant: Northern Digital Inc.
Inventor： Shaulaine White , Elsabe Coetzer , Larry Chen , Athanasios Tommy Balkos
Abstract: A marker for an optical tracking system includes an object having a curved surface and a plurality of beads adhered to the curved surface with an adhesive. The beads of the plurality of beads are configured for being retroreflectors. A bead of the plurality of beads can include a first portion having a reflective surface and a second portion that is substantially transparent. The first portion of the bead is oriented toward the curved surface of the object. The second portion of the bead is oriented away from the curved surface of the object. The beads are applied to the marker. A bead of the plurality of beads can be transparent and embedded in a reflective medium on the marker surface.
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公开(公告)号：US12078825B1
公开(公告)日：2024-09-03
申请号：US18395113
申请日：2023-12-22
Applicant: Northern Digital Inc.
Inventor： Larry Chen , Derek Peter Zwambag , Shaulaine White , Athanasios Tommy Balkos
IPC: G02B5/128
CPC classification number: G02B5/128
Abstract: A marker comprising: a retro-reflective layer having a first retro-reflectance capability and a border defining a retro-reflective area of the retro-reflective layer. The retro-reflective layer includes a textured surface, a portion of the textured surface having a surface topology such that surface normal vectors positioned across the portion extend from the portion of the textured surface in different directions. A plurality of retro-reflective micro elements are distributed across the textured surface. A portion of the border provides a second retro-reflectance capability lower than the first retro-reflectance capability.
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Patent Agency Ranking
公开(公告)号：US20220413196A1
公开(公告)日：2022-12-29
申请号：US17848440
申请日：2022-06-24
Applicant: Northern Digital Inc.
Inventor： Larry Chen , David Willms , Athanasios Tommy Balkos , Shaulaine White
Abstract: A retro-reflective marker comprising a bare retro-reflective layer; a protective layer with a near-infrared (NIR) wavelength specific anti-reflective coating; and a border with an NIR absorbent coating.
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公开(公告)号：US20240411065A1
公开(公告)日：2024-12-12
申请号：US18796878
申请日：2024-08-07
Applicant: Northern Digital Inc.
Inventor： Larry Chen , Derek Peter Zwambag , Shaulaine White , Athanasios Tommy Balkos
IPC: G02B5/128
Abstract: A marker comprising: a retro-reflective layer having a first retro-reflectance capability and a border defining a retro-reflective area of the retro-reflective layer. The retro-reflective layer includes a textured surface, a portion of the textured surface having a surface topology such that surface normal vectors positioned across the portion extend from the portion of the textured surface in different directions. A plurality of retro-reflective micro elements are distributed across the textured surface. A portion of the border provides a second retro-reflectance capability lower than the first retro-reflectance capability.
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公开(公告)号：US20220156966A1
公开(公告)日：2022-05-19
申请号：US17529881
申请日：2021-11-18
Applicant: Northern Digital Inc.
Inventor： Larry Chen , Drexel Lee Hallaway , Shaulaine White , Athanasios Tommy Balkos
IPC: G06T7/73
Abstract: Tracking system for tracking one or more reflective markers includes at least two optical sensors configured to obtain image data of an environment that includes at least one marker. The tracking system obtains the image data from the at least two optical sensors. The tracking system is configured for extracting, from the image data, optical signatures representing reflections of the optical signal from at least one marker, determining optical centroids of the optical signatures of the at least one marker, estimating an initial pose for at least one marker, determining offset error vectors from the optical centroids of the at least one marker based on the initial pose, determining corrected optical centroids based on the offset error vectors and the optical centroids, and determining a corrected three dimensional position of the marker in the environment based on the corrected optical centroids of the marker.
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公开(公告)号：US20240273734A1
公开(公告)日：2024-08-15
申请号：US18438018
申请日：2024-02-09
Applicant: Northern Digital Inc.
Inventor： Larry Chen , Uditha Jayarathne , Steven van Hengstum
CPC classification number: G06T7/246 , G06T17/00 , G06V10/761 , H04N5/74 , G06V2201/07
Abstract: A system includes a projector to project a pattern of dots within a tracking volume, a medical instrument having markers and positioned within the tracking volume, an image capture unit to capture images of the medical instrument and the markers. The image capture unit captures images of the pattern of dots within the tracking volume, and a computing device performs operations that include initiating capture of at least two images of the medical instrument and the markers, determining a three-dimensional position of the markers from the captured images of the markers, initiating projection of the pattern of dots within the tracking volume, initiating capture, of at least two images of a portion of the pattern of dots, and determining three-dimensional positions of dots in the portion of dots from the captured images.
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公开(公告)号：US12039751B2
公开(公告)日：2024-07-16
申请号：US17529881
申请日：2021-11-18
Applicant: Northern Digital Inc.
Inventor： Larry Chen , Drexel Lee Hallaway , Shaulaine White , Athanasios Tommy Balkos
CPC classification number: G06T7/73 , G06T2207/10048 , G06T2207/30204
Abstract: Tracking system for tracking one or more reflective markers includes at least two optical sensors configured to obtain image data of an environment that includes at least one marker. The tracking system obtains the image data from the at least two optical sensors. The tracking system is configured for extracting, from the image data, optical signatures representing reflections of the optical signal from at least one marker, determining optical centroids of the optical signatures of the at least one marker, estimating an initial pose for at least one marker, determining offset error vectors from the optical centroids of the at least one marker based on the initial pose, determining corrected optical centroids based on the offset error vectors and the optical centroids, and determining a corrected three dimensional position of the marker in the environment based on the corrected optical centroids of the marker.
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