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公开(公告)号：US20230289397A1
公开(公告)日：2023-09-14
申请号：US18118459
申请日：2023-03-07
Applicant: NEC Corporation
Inventor： Atsufumi SHIBAYAMA
CPC classification number: G06F17/142 , G06F7/24 , G06F7/523
Abstract: When performing a fast Fourier transform or an inverse fast Fourier transform in M cycles on input data in units of N consecutive input data, an FFT device, in F fast Fourier transforms or F inverse fast Fourier transforms, sorts (F×N) first input data in a first order to output first output data in a second order, performs a butterfly computation process on the first output data to output second output data in the first order, sorts the second output data to output third output data in a third order, and performs a twiddle multiplication process on the third output data to output fourth output data in the third order, and the third order is an order in which processes of the Cth cycle in the F fast Fourier transforms or the F inverse fast Fourier transforms are performed in a consecutive cycle.
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公开(公告)号：US20230273010A1
公开(公告)日：2023-08-31
申请号：US18019687
申请日：2020-08-18
Applicant: NEC Corporation
Inventor： Atsufumi SHIBAYAMA , Shigeru Nakamura
IPC: G01B9/02091 , G01B9/02
CPC classification number: G01B9/02091 , G01B9/02044
Abstract: This optical interference tomographic imaging device includes: a wavelength-sweeping laser light source; a merged light generation means that branches the laser light into two branched lights, and outputs merged light; a branching means that branches the merged light into object light and reference light; an irradiation means that irradiates a prescribed scanning range of an object being measured with the object light; a light receiver that generates information relating to the change in intensity ratio of interference light between the reference light and the object light scattered from the object being measured; and a control means that, on the basis of the information generated by the light receiver, acquires depth-direction structure data pertaining to the object being measured.
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3.发明公开公开(公告)号：US20240275388A1
公开(公告)日：2024-08-15
申请号：US18419673
申请日：2024-01-23
Applicant: NEC Corporation
Inventor： Atsufumi SHIBAYAMA
Abstract: A clock signal frequency divider according to one aspect of the present disclosure includes: an output signal generation circuit configured to generate, from pulses of a received input clock signal, an output clock signal including a repetition of a periodic pattern signal in which a pulse of a mask pulse number is masked among consecutive pulses of a periodic pulse number, the periodic pattern signal including a marker portion including at least one unmasked pulse at a start portion of the periodic pattern signal; and an output circuit configured to output the output clock signal, wherein the output signal generation circuit generates the periodic pattern signal in such a way that a pattern of a timing of the at least one unmasked pulse of the marker portion does not appear in a portion other than a portion corresponding to the marker portion in the output clock signal.
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公开(公告)号：US20220188014A1
公开(公告)日：2022-06-16
申请号：US17439902
申请日：2020-02-10
Applicant: NEC Corporation
Inventor： Atsufumi SHIBAYAMA
IPC: G06F3/06
Abstract: A digital filter device including a data rearrangement processing unit (200) configured to rearrange a plurality of pieces of data input in a first order into a second order, wherein the data rearrangement processing unit (200) includes at least a storage means, the data rearrangement processing unit (200) performs writing of data into the storage means according to a first or second address order, and the data rearrangement processing unit (200) performs data rearrangement processing by performing reading from the storage means according to the second address order for data for which writing is performed in the storage means according to the first address order, and performing reading from the storage means according to the first address order for data for which writing is performed in the storage means according to the second address order.
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公开(公告)号：US20190129913A1
公开(公告)日：2019-05-02
申请号：US16091159
申请日：2017-04-14
Applicant: NEC Corporation
Inventor： Atsufumi SHIBAYAMA
IPC: G06F17/14
Abstract: In order to reduce a circuit scale and power consumption while maintaining filter performance, a digital filter device includes a first transform circuit for executing a first transform process on data in a predetermined frequency range; a filtering circuit for executing a filtering process by setting an operation bit width of data of a preset first frequency component among the data, on which the first transform process was executed by the first transform circuit, to a different bit width from bit widths of other frequency components; and a second transform circuit for executing a second transform process on the data on which the filtering process was executed by the filtering circuit.
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Patent Agency Ranking
公开(公告)号：US20250045985A1
公开(公告)日：2025-02-06
申请号：US18926634
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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公开(公告)号：US20220277498A1
公开(公告)日：2022-09-01
申请号：US17630228
申请日：2019-08-01
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.-
公开(公告)号：US20220214156A1
公开(公告)日：2022-07-07
申请号：US17609859
申请日：2019-05-16
Applicant: NEC Corporation
Inventor： Atsufumi SHIBAYAMA , Shigeru NAKAMURA
IPC: G01B9/02091
Abstract: An optical coherence tomography apparatus (100) includes a wavelength sweeping laser light source (101), a branching and merging device (103) that branches a light beam emitted from the wavelength sweeping laser light source (101) into an object light beam and a reference light beam, an optical spectrum data generation unit (108) that generates information about wavelength dependence of an intensity difference between a plurality of interference light beams generated by interference between an object light beam scattered from a measurement object (200) and a reference light beam, and a control unit (109) that acquires structural data of the measurement object (200) in a depth direction on the basis of the information about wavelength dependence, and connects a plurality of pieces of structural data in the depth direction acquired at different positions in a scanning direction of the measurement object (200), wherein preliminary measurement is performed by causing the wavelength sweeping laser light source (101) to emit a light beam swept in a wavelength sweep range narrower than a wavelength sweep range in actual measurement, and the actual measurement is performed when it is determined that the measurement object (200) is at a position suitable for performing the actual measurement on the basis of results of the preliminary measurement.
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公开(公告)号：US20200334321A1
公开(公告)日：2020-10-22
申请号：US16955201
申请日：2018-12-26
Applicant: NEC Corporation
Inventor： Atsufumi SHIBAYAMA
Abstract: A signal processing apparatus comprises an operation processing part that performs operation processing on data represented in the two's complement representation and a storage processing part that performs storage processing on data represented in a second representation format as a data representation format, and in the second representation format, a data value is identical to one in the two's complement representation when the value is positive or zero, and all the bits lower than the most significant bit that indicates the sign in the two's complement representation are inverted when a data value is negative.
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10.发明申请FAST FOURIER TRANSFORM DEVICE, FAST FOURIER TRANSFORM METHOD, AND RECORDING MEDIUM STORING FAST FOURIER TRANSFORM PROGRAM 有权快速傅里叶变换装置，快速傅立叶变换方法和记录中速快速傅立叶变换程序公开(公告)号：US20150363360A1
公开(公告)日：2015-12-17
申请号：US14761995
申请日：2014-01-22
Applicant: NEC Corporation
Inventor： Atsufumi SHIBAYAMA , Kohei HOSOKAWA
CPC classification number: G06F17/142 , H03H17/0213
Abstract: [Problem] A fast Fourier transform method is provided that are able to input data to be processed or output processing results in no particular order.[Solution] It is included to perform one of a process for rearranging, based on an output order setting, a plurality of output data generated by one of a fast Fourier transform and an inverse fast Fourier transform, and a process for rearranging, based on an input order setting, a plurality of input data into one of the fast Fourier transform and the inverse fast Fourier transform.
Abstract translation: [问题]提供能够以不特定顺序输入要处理的数据或输出处理结果的快速傅立叶变换方法。 [解决方案]基于输出顺序设置来执行由快速傅里叶变换和快速傅里叶逆变换之一生成的多个输出数据的重新排列处理中的一个，以及基于 输入顺序设置，多个输入数据转换为快速傅里叶变换和快速傅里叶逆变换之一。
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