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公开(公告)号：US11460573B2
公开(公告)日：2022-10-04
申请号：US16771450
申请日：2018-10-10
Applicant: NEC Corporation
Inventor： Daisuke Ikefuji , Taichi Tanaka , Osamu Hoshuyama
Abstract: A synthetic aperture radar signal processing device 10 includes a persistent scatterer extraction unit 11 which extracts, from time-series observation data related to an observation target observed from a plurality of observation directions by a radar, a plurality of persistent scatterers in respective observation directions; a persistent scatterer grouping unit 12 which groups the plurality of persistent scatterers in each of the observation directions; a group selection unit 13 which selects, in each of the observation directions, a persistent scatterer group that includes the persistent scatterers included in an analysis target from among groups generated by grouping; and a displacement speed processing unit 14 which synthesize displacement speeds of the selected persistent scatterer groups.
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2.发明授权公开(公告)号：US11933885B2
公开(公告)日：2024-03-19
申请号：US16972155
申请日：2018-06-06
Applicant: NEC Corporation
Inventor： Kazumine Ogura , Masayuki Ariyoshi , Yuzo Senda , Osamu Hoshuyama , Taichi Tanaka , Daisuke Ikefuji , Shingo Yamanouchi
CPC classification number: G01S13/9064 , G01S7/04 , G01S13/32 , G01S13/867
Abstract: A radar signal imaging device 30 includes: a transmission unit 31 which transmits a radar signal toward an object to be imaged that is a non-rigid body; a position estimation unit 32 which estimates the position of the object; an oscillation degree estimation unit 33 which estimates an oscillation degree which is a degree of change within a predetermined period in the relative positions of feature points constituting the object; and a synthetic aperture processing unit 34 which performs synthetic aperture processing on the radar signal reflected by the object on the basis of the estimated position of the object and the estimated oscillation degree.
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公开(公告)号：US20230045129A1
公开(公告)日：2023-02-09
申请号：US17784230
申请日：2019-12-25
Applicant: NEC Corporation
Inventor： Nagma Samreen KHAN , Kyota Higa , Kazumine Ogura , Taichi Tanaka , Masayuki Ariyoshi , Tatsuya Sumiya
Abstract: A receiver receives a radio wave transmitted to a target and scattered by the target to acquire a signal. An imaging unit generates a 3D complex image of the target based on the signal. A value extraction unit extracts intensity information and phase in including an intensity matrix and a phase matrix, the extracted intensity information constituting the intensity matrix and the extracted phases information constituting the phase matrix. A subset selection unit selects a subset from the value set. A transformation unit changes a representation of the subset to generate a 2D real image. A detection unit detects whether there is an undesired object on the target based on the 2D real image.
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公开(公告)号：US20240193856A1
公开(公告)日：2024-06-13
申请号：US18238739
申请日：2023-08-28
Applicant: NEC Corporation
Inventor： Yuki Yamaguchi , Taichi Tanaka , Masato Toda
CPC classification number: G06T17/00 , G01S13/9021 , G06V10/761
Abstract: The signal processing device 10 includes a three-dimensional information with reliability reconstruction unit which generates three-dimensional information with reliability including three-dimensional information involving intensity and an estimated value of a phase at a three-dimensional position reconstructed using observed SAR images and imaging conditions, and information indicating reliability of the three-dimensional information, and a phase signal estimation unit 12 which calculates phase signals for all pixels in an analyzed area for all imaging conditions of SAR images to be analyzed, and calculates the information indicating reliability of the phase signals based on the information indicating reliability of the three-dimensional information.
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公开(公告)号：US11835619B2
公开(公告)日：2023-12-05
申请号：US17055400
申请日：2018-05-16
Applicant: NEC Corporation
Inventor： Daisuke Ikefuji , Taichi Tanaka , Osamu Hoshuyama
IPC: G01S13/90
CPC classification number: G01S13/9058 , G01S13/9023
Abstract: A synthetic aperture radar signal analysis device 20 includes: an extraction unit 21 that extracts a stable reflection point from time-series data acquired through observation, by a synthetic aperture radar, of a region to be observed from a predetermined observing direction; a generation unit 22 that generates a cluster which is a collection of stable reflection points on the basis of the extracted stable reflection point corresponding to the predetermined observing direction; an association unit 23 that associates the generated cluster corresponding to the predetermined observing direction with a structure indicated by map data corresponding to the region to be observed; and a synthesis unit 24 that performs vector-synthesis of displacement rates for a plurality of the clusters each corresponding to the observing direction associated with the structure.
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Patent Agency Ranking
公开(公告)号：US11709254B2
公开(公告)日：2023-07-25
申请号：US16767805
申请日：2017-12-01
Applicant: NEC Corporation
Inventor： Taichi Tanaka , Osamu Hoshuyama
IPC: G01S13/90
CPC classification number: G01S13/90
Abstract: This invention is directed to an image processing apparatus that generates an evaluation index of a persistent scatterer likelihood without any influence of a large phase change with respect to a target whose displacement is nonlinear, a target whose elevation is high, or a target whose displacement is large. The image processing apparatus includes a phase array accumulator that accumulates phase arrays of respective pixels over a plurality of images, a clustering unit that classifies the respective pixels into a plurality of clusters based on the phase arrays, and a phase correlation calculator that calculates a correlation between a phase change in each of the plurality of clusters and the phase array at the respective pixels.
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公开(公告)号：US20250139929A1
公开(公告)日：2025-05-01
申请号：US18835815
申请日：2022-02-21
Applicant: NEC Corporation
Inventor： Taichi Tanaka
Abstract: An image analysis system and an image analysis method are provided that can rapidly extract a cluster of pixels having variations according to the same probability distribution. The image analysis system 10 includes a similarity calculation unit 11 which calculates similarity between a representative distribution representing a cluster and a distribution of pixel values in the cluster, a representative calculation unit 12 which calculates a distribution for a plurality of pixels in each cluster as the representative distribution, and a dividing unit 13 which assigns pixels in an input image to one of a plurality of the clusters with reference to the similarity.
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公开(公告)号：US20240068960A1
公开(公告)日：2024-02-29
申请号：US18230523
申请日：2023-08-04
Applicant: NEC Corporation
Inventor： Taichi Tanaka
CPC classification number: G01N22/00 , G01F23/64 , G01F23/76 , G01N33/1886
Abstract: A measurement apparatus of the present disclosure includes a measuring unit configured to acquire the reflected wave of a radio wave applied to a float and measure the state of a liquid based on the intensity of the acquired reflected wave. Then, the float is configured to float in a liquid in a manner such that a floating height relative to the liquid changes in accordance with the state of the liquid, and is further configured in a manner such that the intensity of the reflected wave of an applied radio wave changes in accordance with a change in the floating height relative to the liquid.
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公开(公告)号：US11846702B2
公开(公告)日：2023-12-19
申请号：US17627211
申请日：2019-07-18
Applicant: NEC Corporation
Inventor： Taichi Tanaka , Osamu Hosyuyama
CPC classification number: G01S13/9021 , G01S7/2813 , G01S13/9005
Abstract: The image processing device 10A includes phase specifying means 11 for specifying a phase of a sample pixel from a plurality of SAR images, clustering means 12 for generating a plurality of clusters by clustering the sample pixels based on correlation of phases of a pair of the sample pixels in the SAR image, and phase statistic data calculation means 13 for calculating phase statistic data capable of grasping a phase statistic regarding the pixel for each of the clusters.
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公开(公告)号：US20230341544A1
公开(公告)日：2023-10-26
申请号：US18026693
申请日：2020-09-29
Applicant: NEC Corporation
Inventor： Taichi Tanaka
CPC classification number: G01S13/9021 , G06T7/97 , G06T2207/10028
Abstract: The image analysis device 100 includes a complex matrix calculation unit 11 which calculates a complex matrix that reflects a phase difference in all pairs of images in multiple images in which a same region is recorded, a parameter candidate selection unit 12 which selects multiple candidates of parameter which explains a phase shift, a candidate evaluation unit 13 which evaluates likelihood of the multiple candidates using the complex matrix and a predetermined weight matrix, and a statistics calculation unit 14 which weights the candidates of parameter by the likelihood and calculates statistics of the candidates of parameter.
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