Nec Corporation

Osamu Hoshuyama

Taichi Tanaka

Daisuke Ikefuji

Akihiko Sugiyama

Yuzo Senda

Shohei Ikeda

Kentarou Kudou

Toshiyuki Nomura

Osamu Shimada

Masayuki Ariyoshi

Shingo Yamanouchi

Manabu Arikawa

Kazumine Ogura

Ryoji Miyahara

Kiyokazu Miki

Yumi Arai

Yumi Ono

The image analyzing device calculates a phase difference image of a pair of images, calculates a phase difference between close pixels in the phase difference image, generates an evaluation function including a shooting time difference of the pair of images and taking a variable that is a displacement velocity difference of close pixels or an evaluation function including a baseline distance and taking a variable that is an elevation of close pixels, and optimizing the evaluation function for each pair of close pixels. The image analyzing device sets a threshold based on a result of evaluation of the random number using the evaluation function, and obtains merged data of an entire image by merging values of variables when performing optimization except for variables for which evaluation value using the evaluation function is below the threshold.

Image analyzing device and image analyzing method

A radar signal imaging deviceincludes: a transmission unitwhich transmits a radar signal toward an object to be imaged that is a non-rigid body; a position estimation unitwhich estimates the position of the object; an oscillation degree estimation unitwhich 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 unitwhich 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.

Radar signal imaging device, radar signal imaging method, and radar signal imaging program

A synthetic aperture radar image analysis systemincludes: a phase correlation determination meanswhich 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 meanswhich 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 meanswhich 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.

Synthetic aperture radar image analysis system, synthetic aperture radar image analysis method, and synthetic aperture radar image analysis program

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.

Synthetic aperture radar signal processing device and signal processing method

A synthetic aperture radar signal analysis deviceincludes: an extraction unitthat 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 unitthat 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 unitthat 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 unitthat performs vector-synthesis of displacement rates for a plurality of the clusters each corresponding to the observing direction associated with the structure.

Synthetic aperture radar signal analysis device, synthetic aperture radar signal analysis method, and synthetic aperture radar signal analysis program

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.

Synthetic-aperture-radar image processing device and image processing method

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.

SAR image analysis system, image processing apparatus, image processing method, and image processing program

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.

Synthetic-aperture-radar-signal processing device, method, and program

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.

Image analysis device, image analysis method, and computer-readable recording medium

A synthetic aperture radar signal processing deviceincludes a persistent scatterer extraction unitwhich 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 unitwhich groups the plurality of persistent scatterers in each of the observation directions; a group selection unitwhich 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 unitwhich synthesize displacement speeds of the selected persistent scatterer groups.

Synthetic aperture radar signal processing device and method

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.

Signal processing device, signal processing method, and signal processing program

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.

Image processing apparatus, image processing method, image processing program, and image processing system

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.

Method for removing inter-radar interference using deconvolution of cross correlated reference signals, signal processing device, signal processing method, and signal processing program

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.

Signal processing device and signal processing method

There is provided a signal processing apparatus that obtains a speech signal with sufficiently reduced wind noise. The signal processing apparatus includes a main microphone that is provided so as to be readily influenced by movement of air outside the signal processing apparatus, a sub microphone that is provided so as to be hardly influenced by movement of air outside the signal processing apparatus, a determiner that determines, based on a strength of a main speech signal output from the main microphone, whether the main speech signal includes a predetermined amount of wind noise, and a selector that receives the main speech signal and a sub speech signal output from the sub microphone, executes, if it is determined that the main speech signal includes the predetermined amount of wind noise, selection processing for outputting the sub speech signal, and executes, if it is determined that the main speech signal includes no predetermined amount of wind noise, selection processing for outputting the main speech signal.

Growing community of inventors

Tokyo, Japan

Osamu Hoshuyama