公开(公告)号：US20230333250A1

公开(公告)日：2023-10-19

申请号：US18025808

申请日：2020-09-16

Applicant: NEC Corporation

Inventor： Yoshimasa ONO ,  Junichi ABE ,  Hidemi NOGUCHI ,  Akira TSUJI ,  Jiro ABE

IPC: G01S17/66

CPC classification number: G01S17/66

Abstract: A monitoring system according to the present disclosure includes: a straight line calculation unit configured to calculate a straight line connecting three-dimensional coordinates of a light source and three-dimensional coordinates of a three-dimensional measuring device configured to measure a target to be measured; an invalid region determination unit configured to define a three-dimension invalid region in which point cloud data acquired by the three-dimensional measuring device is invalid based on the straight line; and a point cloud data processing unit configured to monitor the target to be measured based on the acquired point cloud data and the three-dimension invalid region.

公开(公告)号：US20230111392A1

公开(公告)日：2023-04-13

申请号：US17802998

申请日：2020-03-05

Applicant: NEC Corporation

Inventor： Hidemi NOGUCHI

IPC: G01S17/58 ,  G01S13/58 ,  G01S17/894

Abstract: An optical measurement device (10) according to the present disclosure includes a light-transmitting unit (11) that transmits ranging light for Time of Flight (ToF) ranging, a light-receiving unit (12) that receives reflection light reflected from a measurement object by the ranging light transmitted by the light-transmitting unit (11), a Doppler shift amount calculation unit (13) that calculates a Doppler shift amount of a frequency of the reflection light, based on a phase change amount of the reflection light received by the light-receiving unit (12), and a relative speed calculation unit (14) that calculates a relative speed of the measurement object, based on the Doppler shift amount calculated by the Doppler shift amount calculation unit (13).

公开(公告)号：US20220156914A1

公开(公告)日：2022-05-19

申请号：US17599757

申请日：2020-03-17

Applicant: NEC Corporation

Inventor： Yoshimasa ONO ,  Akira TSUJI ,  Hidemi NOGUCHI ,  Junichi ABE

IPC: G06T7/00 ,  G06V10/764 ,  G06T7/70 ,  G01B11/30 ,  G01S17/89

Abstract: There is provided a surface abnormality detection device, and a system, capable of detecting an abnormal portion having a displacement below the distance measurement accuracy when detecting the abnormal portion on the surface of a structure. A surface abnormality detection device includes a classification means for classifying an object under measurement into one or more clusters having the same structure, based on position information at a plurality of points on a surface of the object under measurement; a determination means for determining a reflection brightness normal value of the cluster based on a distribution of reflection brightness values at a plurality of points on a surface of the cluster; and an identification means for identifying an abnormal portion on the surface of the cluster based on a difference between the reflection brightness normal value and the reflection brightness value at each of the plurality of points.

公开(公告)号：US20190326987A1

公开(公告)日：2019-10-24

申请号：US16470652

申请日：2017-12-19

Applicant: NEC Corporation

Inventor： Hidemi NOGUCHI

IPC: H04B10/079 ,  H04J14/02 ,  H04B10/69

Abstract: A reception device 20 is configured to include a separation means 21 and a plurality of optical reception means 22. Each optical reception means 22 is configured to further include an optical/electrical conversion means 23 and a band restoration means 24. The separation means 21 separates a multiplexed signal into which signals of respective channels to which spectral shaping that narrows bandwidth to less than or equal to a baud rate is applied are multiplexed at spacings less than or equal to the baud rate on the transmission side into optical signals for the respective channels. Each optical/electrical conversion means 23 converts an optical signal to an electrical signal as a reception signal. Each band restoration means 24 applies processing having inverse characteristics to those of the band narrowing filter processing to the reception signal and restores the band of the reception signal.

公开(公告)号：US20190140740A1

公开(公告)日：2019-05-09

申请号：US16099931

申请日：2017-05-08

Applicant: NEC Corporation

Inventor： Hidemi NOGUCHI

IPC: H04B10/2507 ,  H04B10/61 ,  H04B10/40

Abstract: In order to enable flexible and efficient operations according to various electric power circumstances, a digital optical communication system 1 is provided with multiple optical transfer apparatuses 2, 3 and a communication control unit 4. The optical transfer apparatuses 2, 3 respectively house optical transmission/reception devices 10, 20 each including a reception-side waveform equalization processing unit 12 and a transmission-side waveform equalization processing unit 11 that perform, respectively on the reception side and on the transmission side, equalization processing for compensating waveform distortion that occurs on transfer paths 5, 6. The communication control unit 4 controls, on the basis of information about the amounts of power that can be supplied to the optical transfer apparatuses 2, 3, the reception-side waveform equalization processing unit 12 and the transmission-side waveform equalization processing unit 11 such that, between the optical transfer apparatuses 2, 3 communicating with each other via the transfer paths 5, 6, either the transmission-side waveform equalization processing unit 11 in the optical transmission/reception device of one of the optical transfer apparatuses or the reception-side waveform equalization processing unit 12 in the optical transmission/reception device of the other optical transfer apparatus performs the equalization processing.

公开(公告)号：US20160036532A1

公开(公告)日：2016-02-04

申请号：US14775831

申请日：2013-11-25

Applicant: NEC CORPORATION

Inventor： Hidemi NOGUCHI

IPC: H04B10/556 ,  H04B10/564 ,  H04B10/079

CPC classification number: H04B10/5561 ,  G02F2001/212 ,  G02F2203/50 ,  H04B10/07955 ,  H04B10/50572 ,  H04B10/564

Abstract: To correct and uniform phase shift at each phase modulation area in an optical modulator in operation. An optical modulation unit outputs a four-level modulated optical signal. A signal distribution circuit outputs signals based on an input digital signal. A drive circuit outputs drive signals from drivers and a calibration driver connected to phase modulation areas and calibration phase modulation areas. A control circuit calibrates amplitudes of the drive signals output from the drivers to coincide with phase shifts by the calibration phase modulation areas according to light intensity of the optical signal.

Abstract translation: 在操作中的光调制器中的每个相位调制区域校正和均匀的相移。 光调制单元输出四电平调制光信号。 信号分配电路根据输入的数字信号输出信号。 驱动电路输出来自驱动器的驱动信号和连接到相位调制区域和校准相位调制区域的校准驱动器。 控制电路根据光信号的光强度校准从驱动器输出的驱动信号的幅度与由校准相位调制区域相移的相移。