Patents by Inventor Osamu Hoshuyama

Osamu Hoshuyama has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11841422
    Abstract: The signal processing device includes an interference processing unit which generates an interferogram from a plurality of SAR images, a coherence calculation unit which calculates coherence of the SAR images, a singular point processing unit which performs an operation for resolving singular points in the interferogram, a phase unwrapping unit which executes a phase unwrapping process using operation result of the singular point processing unit, and an SBAS analysis unit which performs displacement analysis by SBAS, using processing result of the phase unwrapping unit.
    Type: Grant
    Filed: May 29, 2019
    Date of Patent: December 12, 2023
    Assignee: NEC CORPORATION
    Inventors: Daisuke Ikefuji, Taichi Tanaka, Osamu Hoshuyama
  • Patent number: 11841421
    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.
    Type: Grant
    Filed: May 8, 2018
    Date of Patent: December 12, 2023
    Assignee: NEC CORPORATION
    Inventors: Taichi Tanaka, Daisuke Ikefuji, Osamu Hoshuyama
  • Patent number: 11835619
    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.
    Type: Grant
    Filed: May 16, 2018
    Date of Patent: December 5, 2023
    Inventors: Daisuke Ikefuji, Taichi Tanaka, Osamu Hoshuyama
  • Publication number: 20230351567
    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.
    Type: Application
    Filed: March 17, 2020
    Publication date: November 2, 2023
    Applicant: NEC Corporation
    Inventors: Taichi TANAKA, Osamu HOSHUYAMA
  • Patent number: 11754704
    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,
    Type: Grant
    Filed: March 29, 2019
    Date of Patent: September 12, 2023
    Assignee: NEC CORPORATION
    Inventors: Daisuke Ikefuji, Taichi Tanaka, Osamu Hoshuyama
  • Patent number: 11709254
    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.
    Type: Grant
    Filed: December 1, 2017
    Date of Patent: July 25, 2023
    Assignee: NEC CORPORATION
    Inventors: Taichi Tanaka, Osamu Hoshuyama
  • Patent number: 11662459
    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.
    Type: Grant
    Filed: June 23, 2017
    Date of Patent: May 30, 2023
    Assignee: NEC CORPORATION
    Inventors: Daisuke Ikefuji, Osamu Hoshuyama
  • Publication number: 20230133736
    Abstract: The image analyzing device includes an inter-image phase difference calculation unit 12 calculating a phase difference image of a pair of images, an inter-pixel phase difference calculation unit 13 calculating a phase difference between close pixels in the phase difference image, an evaluation function generation unit 14 generating an evaluation function that includes at least the phase difference between pixels, an optimization unit 15 optimizing the evaluation function for each pair of pixels or each pair of close pixels, a random number generation unit 21 generating a random number, a threshold setting unit 22 setting a threshold based on a result of evaluation of the random number using the evaluation function, and a merging unit 17 obtaining merged data of an entire image by merging values of variables when the optimization unit 15 performs optimization except for variables for which evaluation value using the evaluation function is below the threshold.
    Type: Application
    Filed: March 24, 2020
    Publication date: May 4, 2023
    Applicant: NEC Corporation
    Inventors: Taichi TANAKA, Osamu HOSHUYAMA
  • Patent number: 11487001
    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.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: November 1, 2022
    Assignee: NEC CORPORATION
    Inventors: Taichi Tanaka, Osamu Hoshuyama
  • Patent number: 11460573
    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.
    Type: Grant
    Filed: October 10, 2018
    Date of Patent: October 4, 2022
    Assignee: NEC CORPORATION
    Inventors: Daisuke Ikefuji, Taichi Tanaka, Osamu Hoshuyama
  • Publication number: 20220283294
    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.
    Type: Application
    Filed: August 5, 2019
    Publication date: September 8, 2022
    Applicant: NEC Corporation
    Inventors: Taichi TANAKA, Osamu HOSHUYAMA
  • Patent number: 11422248
    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.
    Type: Grant
    Filed: October 4, 2017
    Date of Patent: August 23, 2022
    Assignee: NEC CORPORATION
    Inventors: Osamu Hoshuyama, Kentarou Kudou, Shohei Ikeda
  • Patent number: 11397261
    Abstract: Persistent scatterers on images and a target object are readily associated with each other. There is provided an image processing apparatus including a persistent scatterer specifier, a phase acquirer, and a clustering unit. The persistent scatterer specifier of the image processing apparatus specifies persistent scatterers at which reflection is stable in a plurality of images. The phase acquirer of the image processing apparatus acquires phases of the specified persistent scatterers. The clustering unit of the image processing apparatus clusters the persistent scatterers based on the positions of the persistent scatterers and the phases.
    Type: Grant
    Filed: October 4, 2018
    Date of Patent: July 26, 2022
    Assignee: NEC CORPORATION
    Inventors: Taichi Tanaka, Osamu Hoshuyama
  • Publication number: 20220221577
    Abstract: The signal processing device includes an interference processing unit which generates an interferogram from a plurality of SAR images, a coherence calculation unit which calculates coherence of the SAR images, a singular point processing unit which performs an operation for resolving singular points in the interferogram, a phase unwrapping unit which executes a phase unwrapping process using operation result of the singular point processing unit, and an SBAS analysis unit which performs displacement analysis by SBAS, using processing result of the phase unwrapping unit.
    Type: Application
    Filed: May 29, 2019
    Publication date: July 14, 2022
    Applicant: NEC Corporation
    Inventors: Daisuke IKEFUJI, Taichi TANAKA, Osamu HOSHUYAMA
  • Publication number: 20220179065
    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,
    Type: Application
    Filed: March 29, 2019
    Publication date: June 9, 2022
    Applicant: NEC Corporation
    Inventors: Daisuke IKEFUJI, Taichi TANAKA, Osamu HOSHUYAMA
  • Patent number: 11300671
    Abstract: The present invention is a signal processing device that efficiently removes multiple types of interference waves mixed in with a received signal. This signal processing device is provided with: a first extraction unit that performs deconvolution with respect to a cross-correlation of a reference signal and a received signal and to an autocorrelation of the reference signal, and extracts a channel response to the reference signal; a second extraction unit that extracts a main channel response corresponding to the reference signal from the channel response; and a removal unit that restores a signal by performing convolution with respect to the reference signal and the main channel response, and removes the restored signal from the received signal.
    Type: Grant
    Filed: December 26, 2016
    Date of Patent: April 12, 2022
    Assignee: NEC CORPORATION
    Inventors: Osamu Hoshuyama, Manabu Arikawa
  • Patent number: 11231495
    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.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: January 25, 2022
    Assignee: NEC CORPORATION
    Inventors: Osamu Hoshuyama, Kentarou Kudou, Shohei Ikeda
  • Publication number: 20210333389
    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.
    Type: Application
    Filed: June 23, 2017
    Publication date: October 28, 2021
    Applicant: NEC Corporation
    Inventors: Daisuke IKEFUJI, Osamu HOSHUYAMA
  • Publication number: 20210239829
    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.
    Type: Application
    Filed: June 6, 2018
    Publication date: August 5, 2021
    Applicant: NEC Corporation
    Inventors: Kazumine OGURA, Masayuki ARIYOSHI, Yuzo SENDA, Osamu HOSHUYAMA, Taichi TANAKA, Daisuke IKEFUJI, Shingo YAMANOUCHI
  • Publication number: 20210223389
    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.
    Type: Application
    Filed: May 16, 2018
    Publication date: July 22, 2021
    Applicant: NEC Corporation
    Inventors: Daisuke IKEFUJI, Taichi TANAKA, Osamu HOSHUYAMA