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公开(公告)号：US20210132214A1
公开(公告)日：2021-05-06
申请号：US17053211
申请日：2018-05-08
Applicant: NEC Corporation
Inventor： Taichi TANAKA , Daisuke IKEFUJI , Osamu HOSHUYAMA
Abstract: A synthetic aperture radar image analysis system 20 includes: a phase correlation determination means 21 which determines a strength of the phase correlation between a plurality of pixels in an image selected from among a plurality of images on the basis of the plurality of images that have been photographed by a synthetic aperture radar and show the same point; a shape determination means 22 which determines a degree of similarity between the shape of the distribution of the plurality of pixels and an object shape indicated by geospatial information; and an association means 23 which associates the plurality of pixels with the object on the basis of the determined strength of the phase correlation and the determined degree of similarity.
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公开(公告)号：US20200096628A1
公开(公告)日：2020-03-26
申请号：US16470301
申请日：2017-12-20
Applicant: NEC Corporation
Inventor： Taichi TANAKA , Osamu HOSHUYAMA
Abstract: An image analysis device that ease association between an SAR image and an object is provided. The image analysis device includes: a stable reflection point identification unit that identifies, based on a plurality of synthetic aperture radar (SAR) images, stable reflection points at which reflection is stable in the plurality of SAR images; a phase identification unit that identifies a phase at each of the stable reflection points, based on the plurality of SAR images and a location of the stable reflection point in the plurality of SAR images; and a clustering means that clusters the stable reflection points, based on a Euclidian distance between each of the stable reflection points and a correlation of the phases at each of the stable reflection points.
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公开(公告)号：US20200081111A1
公开(公告)日：2020-03-12
申请号：US16466335
申请日：2017-10-04
Applicant: NEC Corporation
Inventor： Osamu HOSHUYAMA , Kentarou KUDOU , Shohei IKEDA
IPC: G01S13/56 , G01S13/536
Abstract: The present invention relates to a signal processing device for accurately detecting a moving object without being influenced by the speed of the moving object. This signal processing device is provided with: at least two cross-correlation calculation units for calculating cross-correlation functions for the waveform of a reflection signal obtained through the reflection, by an object, of a transmission signal having a varying frequency and different correlation waveforms generated from the waveform of the transmission signal; a combination unit for combining the at least two cross-correlation functions from the at least two cross-correlation calculation units so as not to be separated in the frequency shift direction; and a detection unit for detecting the object on the basis of the cross-correlation function resulting from the combination.
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公开(公告)号：US20200081109A1
公开(公告)日：2020-03-12
申请号：US16494811
申请日：2018-03-23
Applicant: NEC Corporation
Inventor： Osamu HOSHUYAMA , Kentarou KUDOU , Shohei IKEDA
IPC: G01S13/536 , G01S7/35
Abstract: In order to achieve object detection that does not detect an object moving at a speed within a prescribed speed range, the present invention comprises at least two cross-correlation calculation units which each calculate a cross correlation function between a waveform of a reflection signal obtained when a transmission signal having changing frequencies is reflected by a target object, and a different correlation waveform generated from the waveform of the transmission signal, and a synthesis unit that synthesizes at least two cross-correlation functions from at least the two cross-correlation calculation units so as to make detection of a target object moving at a speed within the prescribed speed range less likely, and that outputs the synthesis results to a post-processing unit.
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公开(公告)号：US20230351567A1
公开(公告)日：2023-11-02
申请号：US17909637
申请日：2020-03-17
Applicant: NEC Corporation
Inventor： Taichi TANAKA , Osamu HOSHUYAMA
CPC classification number: G06T5/50 , G06T7/97 , G01S13/9021 , G06T5/002 , G06T2207/20221
Abstract: The data processing device 1 includes a coherence matrix calculation unit 2 which calculates a coherence matrix representing correlation of pixels at the same position in multiple complex images, a spatial correlation generator 3 which generates data representing prior information regarding spatial correlation being correlation of pixels in each of the multiple complex images, and a phase difference estimation unit 4 which merges the correlation of pixels regarding the coherence matrix and the spatial correlation, and calculates a statistically likely and consistent phase difference based on merged correlation as a denoised phase difference.
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Patent Agency Ranking
公开(公告)号：US20220283294A1
公开(公告)日：2022-09-08
申请号：US17632343
申请日：2019-08-05
Applicant: NEC Corporation
Inventor： Taichi TANAKA , Osamu HOSHUYAMA
IPC: G01S13/90 , G01B9/02055 , G06T1/00
Abstract: The phase unwrapping device 10 includes coordinate transformation means 11 for transforming coordinates of a map including height information into SAR image coordinates, weight calculation means 12 for determining a place, from the map whose coordinates are transformed into the SAR image coordinate, where phase discontinuity may occur in a phase different image generated from two SAR images and attaching a weight to the place where it is determined that phase discontinuity may occur, and phase unwrapping means 13 for performing phase unwrapping for the phase difference image using the weight.
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公开(公告)号：US20220179065A1
公开(公告)日：2022-06-09
申请号：US17441866
申请日：2019-03-29
Applicant: NEC Corporation
Inventor： Daisuke IKEFUJI , Taichi TANAKA , Osamu HOSHUYAMA
IPC: G01S13/90
Abstract: The synthetic aperture radar image processing device includes time-series analysis unit which extracts persistent scatterers from time-series observation data for the observation direction for an observation area observed from multiple observation directions by a radar, and calculating displacement speeds of the extracted persistent scatterers, clustering unit which generates reflection point clusters by clustering extracted persistent scatterers based on their phase and position, distance calculation unit which calculates a distance between each of the persistent scatterers included in the reflection point clusters and each structure included in the observation area, representative value calculation unit which calculates each representative value for the distance between each persistent scatterer and each structure, for each reflection point cluster, and corresponding structure determination unit which associates the structure corresponding to the smallest representative value with the persistent scatterer, for each reflection point cluster.
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公开(公告)号：US20210333389A1
公开(公告)日：2021-10-28
申请号：US16625154
申请日：2017-06-23
Applicant: NEC Corporation
Inventor： Daisuke IKEFUJI , Osamu HOSHUYAMA
IPC: G01S13/90
Abstract: A synthetic-aperture-radar-signal processing device includes a range bin selection unit which selects, from an observed image, range bins including a signal from an isolated reflection point, a phase evaluation unit which evaluates phases in an azimuth direction in the range bins, a window function multiplication unit which designs a window function on the basis of results of the evaluation by the phase evaluation unit and multiply the range bins by the window function, and a phase error correction unit which corrects the observed image by estimating a phase error from the range bins multiplied by the window function.
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公开(公告)号：US20210223389A1
公开(公告)日：2021-07-22
申请号：US17055400
申请日：2018-05-16
Applicant: NEC Corporation
Inventor： Daisuke IKEFUJI , Taichi TANAKA , Osamu HOSHUYAMA
IPC: G01S13/90
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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20.发明申请公开(公告)号：US20160171965A1
公开(公告)日：2016-06-16
申请号：US14967724
申请日：2015-12-14
Applicant: NEC Corporation
Inventor： Yumi ARAI , Yuzo SENDA , Osamu HOSHUYAMA
IPC: G10K11/178 , H04R29/00
CPC classification number: H04R29/00 , G01S5/22 , H04R2430/23
Abstract: A vibration source estimation device, method and computer-readable medium are provided. The vibration source estimation device comprises a processor configured to execute instructions to receive data samples of a plurality of vibration signals generated at a vibration position, the data samples being associated with a plurality of frames. The processor is also configured to execute instructions to calculate a cross correlation function for each frame based on the data samples, calculate a weight for each frame based on a signal-to-noise ratio calculated from the cross correlation function, multiply the cross correlation function for each frame by the weight, calculate a sum of weighted cross correlation functions for respective frames as a weighted-cross-correlation function, and estimate the vibration position based on the weighted-cross-correlation function.
Abstract translation: 提供振动源估计装置，方法和计算机可读介质。 振动源估计装置包括处理器，其被配置为执行指令以接收在振动位置产生的多个振动信号的数据样本，所述数据样本与多个帧相关联。 处理器还被配置为执行指令以基于数据样本计算每个帧的互相关函数，基于从互相关函数计算的信噪比来计算每个帧的权重，将互相关函数 对于每个帧，通过权重，计算各个帧的加权互相关函数的和作为加权互相关函数，并且基于加权互相关函数估计振动位置。
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