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公开(公告)号：US20250064346A1
公开(公告)日：2025-02-27
申请号：US18722677
申请日：2021-12-24
Applicant: NEC Corporation
Inventor： Shigeru NAKAMURA
IPC: A61B5/1172 , A61B5/00 , G06T7/30
Abstract: An optical coherence tomography analysis apparatus includes: an acquisition unit that performs optical coherence tomography by applying a light beam, and that acquires three-dimensional luminance data about the skin; a position extraction unit that extracts an epidermis position, for each tomography image obtained by scanning in a fast axis direction of the light beam, in the three-dimensional luminance data about the skin; a connection unit that generates connected three-dimensional data, by adjusting relative positions between tomography images and connecting the tomography images, on the basis of an extraction result of the epidermis position; a flattening unit that generates flattened three-dimensional data, by performing transformation processing of flattening epidermis on the connected three-dimensional data, on the basis of an extraction result of the epidermis position; and a pattern extraction unit that extracts a pattern of the skin corresponding to a predetermined extraction depth, from the flattened three-dimensional data.
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公开(公告)号：US20250054208A1
公开(公告)日：2025-02-13
申请号：US18926835
申请日：2024-10-25
Applicant: NEC Corporation
Inventor： Yoshimasa ONO , Shigeru NAKAMURA , Atsufumi SHIBAYAMA , Junichi ABE
Abstract: Provided is a processing apparatus capable of obtaining a 2D image from 3D tomographic images, extracting an image for accurate authentication, and extracting an image at a high speed. A processing apparatus includes: means for calculating, from three-dimensional luminance data indicating an authentication target, depth dependence of striped pattern sharpness in a plurality of regions on a plane perpendicular to a depth direction of the target; means for calculating a depth at which the striped pattern sharpness is the greatest in the depth dependence of striped pattern sharpness; rough adjustment means for correcting the calculated depth on the basis of depths of other regions positioned respectively around the plurality of regions; fine adjustment means for selecting a depth closest to the corrected depth and at which the striped pattern sharpness is at an extreme; and means for extracting an image with a luminance on the basis of the selected depth.
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3.发明公开公开(公告)号：US20240288263A1
公开(公告)日：2024-08-29
申请号：US18571402
申请日：2021-06-28
Applicant: NEC Corporation
Inventor： Shigeru NAKAMURA
IPC: G01B9/02091
CPC classification number: G01B9/02091
Abstract: An optical coherence tomography imaging apparatus includes: a wavelength-swept laser light source; a branching unit that divides a light emitted from the wavelength-swept laser light source into a plurality of lights; and a plurality of units that obtain tomographic information on a different measurement target by using each of the plurality of lights outputted from the branching unit. Each of the plurality of units includes: a branching/generation unit that generates an object light and a reference light; a light beam scanning unit that applies the object light to the measurement target; a signal generation unit that generates an electric signal in accordance with intensity of an interference light obtained by allowing interference of the object light scattered by the measurement target and the reference light; and an information generation unit that generates the tomographic information on the measurement target on the basis of the electric signal.
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公开(公告)号：US20230358527A1
公开(公告)日：2023-11-09
申请号：US18022015
申请日：2020-08-27
Applicant: NEC Corporation
Inventor： Shigeru NAKAMURA
IPC: G01B9/02091 , G01B9/02004 , G01B9/02055
CPC classification number: G01B9/02091 , G01B9/02004 , G01B9/02072
Abstract: This optical interference tomographic imaging device comprising: a wavelength swept laser light source; a splitting means for splitting light emitted from the light source into object light and reference light; an irradiation means for directing the object light outputted to an object, and scanning a predetermined range; a light spectral data generation means for generating information regarding the wavelength dependency of the intensity ratio of interfering light of the reference light and the object light that has been directed to the object to be measured and has been scattered; a wavelength dispersion compensation processing means for performing compensation for the information regarding the wavelength dependency generated, the compensation carried out based on the wavelength dispersion difference of the path of the object light path and the path of the reference light; and a cross section structure information generation means for generating cross section structure information of the object.
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公开(公告)号：US20210359485A1
公开(公告)日：2021-11-18
申请号：US16479631
申请日：2018-01-19
Applicant: NEC Corporation
Abstract: There is the problem that, in a multicore optical fiber amplifier based on a clad excitation method, it is difficult to suppress the occurrence of an optical surge due to input of signal light into a core with no signal light, without the occurrence of fluctuation in the gain of a core into which signal light is inputted; therefore, a multicore optical fiber amplifier according to an exemplary aspect of the present invention includes a multicore optical fiber amplification medium including, in a clad, a plurality of cores doped with a rare earth element; signal light introduction means for introducing, into each of the plurality of cores, signal light with a wavelength included in a gain band of the multicore optical fiber amplification medium; excitation light introduction means for introducing, into the clad, excitation light for exciting the multicore optical fiber amplification medium; and control light introduction means for introducing control light into each of the plurality of cores, wherein the control light introduction means introduces the control light into a non-signal core into which the signal light is not being introduced, among the plurality of cores, only when the excitation light is being introduced.
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Patent Agency Ranking
公开(公告)号：US20170227712A1
公开(公告)日：2017-08-10
申请号：US15514563
申请日：2015-09-15
Applicant: NEC Corporation
Inventor： Tomoaki KATO , Shigeru NAKAMURA
CPC classification number: G02B6/122 , G02B6/1228 , G02B6/125 , G02B6/2813 , G02B6/29344 , G02B6/2938 , G02B2006/12097
Abstract: Provided are a practical rib type optical waveguide in which polarization dependence and wavelength dependence and the like are small and an optical multiplexer/demultiplexer using the same. An optical waveguide type optical multiplexer/demultiplexer of the present invention includes a substrate, M input optical waveguides and N output optical waveguides including a single mode rib type optical waveguide, multi-mode optical interference regions including a rib type optical waveguide, and reversible tapered regions that smoothly connect the input/output optical waveguides to the multi-mode optical interference regions and include M×N rib type optical waveguides, and both side surfaces of the multi-mode optical interference region are respectively formed in a stepped shape.
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公开(公告)号：US20250029419A1
公开(公告)日：2025-01-23
申请号：US18711910
申请日：2022-03-25
Applicant: NEC Corporation
Inventor： John Kenji David CLARK , Shigeru NAKAMURA
Abstract: An optical coherence tomography image generation apparatus includes: an acquisition unit that acquires a stereoscopic 3D image of a target; a determination unit that determines a plurality of scan areas on the target, on the basis of the stereoscopic 3D image; and a control unit that relatively moves an irradiation position of light for capturing an optical coherence tomography image of the target with respect to the target, and that controls scanning by the light of each of the plurality of scan areas.
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8.发明申请公开(公告)号：US20250014392A1
公开(公告)日：2025-01-09
申请号：US18712289
申请日：2022-03-31
Applicant: NEC Corporation
Inventor： Shigeru NAKAMURA , John Kenji David CLARK
Abstract: An information processing apparatus includes: a detection unit that detects a target-to-target distance between an imaging target and a light irradiation unit that irradiates light for scanning the imaging target; and a scan control unit that starts irradiation with the light by the light irradiation unit in a case where the target-to-target distance is a desired distance.
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公开(公告)号：US20220139105A1
公开(公告)日：2022-05-05
申请号：US17431784
申请日：2019-02-22
Applicant: NEC Corporation
Inventor： Yoshimasa ONO , Shigeru NAKAMURA , Atsufumi SHIBAYAMA , Junichi ABA
Abstract: A technique for accurately extracting a fingerprint image for accurate authentication from 3D tomographic luminance data of a finger at a high speed. A processing apparatus (11) according to the present disclosure includes means for, after performing edge detection processing on a tomographic image (101, 102, . . . 10 k, . . . , 10n) at each depth, calculating the total number of edge pixels in the tomographic image from 3D (three-dimensional) tomographic luminance data, and acquiring depth dependence of the number of edges (111, 112), and means for extracting a tomographic image having a striped pattern from the depth dependence of the number of edges and the 3D tomographic luminance data.
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公开(公告)号：US20210389116A1
公开(公告)日：2021-12-16
申请号：US17291071
申请日：2019-10-31
Applicant: NEC Corporation
Inventor： Shigeru NAKAMURA
Abstract: An optical coherence tomography apparatus includes a branching and merging device that branches a light beam emitted from a wavelength sweeping laser light source into an object light beam and a reference light beam, a balanced photodetector that generates information about a change in an intensity ratio of interference light beams, which are generated by the interference between the object light beam and the reference light beam, wherein the object light beam is scattered from the measurement object after being transmitted through the transparent substrate including a structure that changes a thickness, and a control unit that acquires structural data of the measurement object in a depth direction based on the information about the change in the intensity ratio of the interference light beams and connects the structural data while moving an irradiation position of the object light beam with a position of the above structure as a reference.
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