Nec Corporation

Other

Shingo Yamanouchi

Masayuki Ariyoshi

Kazumine Ogura

Kazuaki Kunihiro

Tatsuya Sumiya

Toshiyuki Nomura

Kazumi Shiikuma

Daisuke Matsuo

Shinichi Morimoto

Taichi Tanaka

Akihiko Sugiyama

Yuzo Senda

Osamu Hoshuyama

Daisuke Ikefuji

Atsushi Honda

Masanori Sekido

Masaru Eto

Nagma Samreen Khan

For increasing measurement precision while suppressing cost increase when measuring a permittivity of an object using a radio wave, an object detection apparatus includes a transmission unit projecting a radio wave toward a target object by using a transmission antenna, a reception unit receiving the radio wave reflected by the target object by a reception antenna and generating an intermediate frequency signal, and an arithmetic apparatus. The arithmetic apparatus computes a reflection amplitude of the target object from the intermediate frequency signal, computes a reflectance from the reflection amplitude, computes a complex permittivity absolute value of the target object from the computed reflectance, computes a depth position of the target object from the reflection amplitude, computes a thickness of the target object from the depth and the reflection amplitude, and computes a permittivity of the target object from the reflection amplitude, the complex permittivity absolute value, and the thickness.

Object detection apparatus, object detection method, and non-transitory computer readable medium

A target object detection apparatus () includes an acquisition unit (), a likelihood information generation unit (), and a determination unit (). The acquisition unit () acquires an IF signal from an irradiation apparatus () at a plurality of timings. The likelihood information generation unit () executes, by processing the IF signal, processing of generating, with respect to each of a plurality of IF signals, likelihood information for a region (hereinafter, referred to as a target object region) having a possibility in that an accompaniment, i.e., a target object is present. The likelihood information indicates a distribution of presence probabilities of a target object in at least a height direction in a target object region. Then, the determination unit () determines a presence or absence of a target object, by using likelihood information generated for each of a plurality of target object regions.

Target object detection apparatus, target object detection method, and non-transitory computer readable medium

An object detection apparatusincludes: a transmission unit, having a transmission antenna, configured to emit a radio wave toward an object using the transmission antenna; a reception unit, having a reception antenna, configured to receive the radio wave reflected by the object as a reception signal and generate an intermediate frequency signal from the reception signal received; and a processing device. The processing devicecalculates an amplitude distribution of the radio wave reflected by the object on the basis of the placement of the transmission antenna, the placement of the reception antenna, the frequency of the radio wave emitted from the transmission antenna, and the intermediate frequency signal, and furthermore, using a correction operator calculated from a point spread function indicating characteristics of the transmission unitand the reception unit, corrects the amplitude distribution calculated.

Object detection apparatus, object detection method, and computer-readable recording medium

The present invention provides a processing system () including an image capturing unit () that captures an image of a person passing through a first area and generates a person image indicating an appearance of the person, an electromagnetic wave transmission/reception unit () that emits an electromagnetic wave having a wavelength of 30 micrometers or more and 1 meter or less toward the person passing through the first area, and receives a reflected wave, a determination unit () that determines whether the person possesses a pre-designated object, based on a signal of the received reflected wave, and a registration unit () that registers, in a first list, the person image of the person determined to possess the pre-designated object.

Processing apparatus, processing method, and non-transitory storage medium

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

To shorten a waiting time for a belongings inspection, the present invention provides an inspection systemincluding an acquisition unitthat acquires material information including at least either one of a piece of personal unique information unique to each of inspection target persons, and a piece of environment information indicating a state value of an environment that changes at each inspection timing, and a determination unitthat determines a content of an inspection for the each inspection target person and/or at the each inspection timing, based on the material information.

Inspection system for inspecting contents of a target person, and inspection method thereof

An object detection apparatusis provided with: a transmission unitthat emits a radio wave as a transmission signal toward a targetobject; a reception unitthat receives, through receiving antennas, radio waves reflected by the object as reception signals, and that generates, for each reception signal received by the respective receiving antennas, using the reception signals, an intermediate frequency signal; and an arithmetic devicethat decides sampling times so as to suppress generation of a virtual image by a beam pattern obtained by synthesizing the respective intermediate frequency signals, and generates an intermediate frequency signal for target position detection by performing sampling on the intermediate frequency signals at the decided sampling times, and detects the target using the intermediate frequency signals for position detection.

To shorten a waiting time for a belongings inspection, the present invention provides an inspection systemincluding an acquisition unitthat acquires personal unique information unique to each of inspection target persons, and a determination unitthat determines a content of a belongings inspection based on a signal of a reflection wave of an electromagnetic wave having a wavelength of equal to or more than 30 micrometers and equal to or less than one meter for the each inspection target person, based on the personal unique information.

Systems and methods for determining contents of a belongings inspection based on a signal

There is provided an object identification apparatus for identifying a stationary object and a moving object. The object identification apparatus includes a phase difference calculator that calculates phase difference information between a transmission signal and a reception signal obtained by reflecting, by surfaces of the moving object and the stationary object in a space, the transmission signal emitted to the space and receiving the reflected transmission signal, a distance calculator that calculates distance information using the phase difference information, a distance information separator that separates the distance information into moving object distance information as distance information about the moving object and stationary object distance information as distance information about the stationary object, and an identifier that identifies the stationary object and the moving object based on the stationary object distance information and the moving object distance information.

Object identification apparatus, object identification method, and object identification program

A position measurement device which includes: a storage unit that stores area information for setting a first region along a boundary of the specific area; an area setting unit that acquires the area information from the storage unit and sets the first region on the basis of the acquired area information; and a position measurement unit that acquires the first region from the area setting unit, sets the acquired first region as a verification region, measures the position of the object located in the verification region, and updates the area information stored in the storage unit.

Position measurement device, position measurement method, and program recording medium

An object sensing apparatusincludes: an emission unitconfigured to emit an RF transmission signal in each period; a reception unitconfigured to receive a reflected wave of the RF transmission signal as an RF reception signal; an IF signal generation unitconfigured to generate an IF signal by mixing the RF transmission signal and the RF reception signal; a one-dimensional spectrum generation unitconfigured to generate a one-dimensional spectrum with respect to distance obtained using the object sensing apparatus as a reference, based on the IF signal, and use the generated one-dimensional spectrum to generate a one-dimensional spectrum with fixed object reflection removed, from which a signal component caused by a reflected wave from a fixed object present in an emission range has been removed; a position detection unitconfigured to detect a position of an object other than the fixed object based on the amplitude of the one-dimensional spectrum with fixed object reflection removed; and a displacement detection unitconfigured to detect displacement of the object other than the fixed object, based on the phase of the one-dimensional spectrum with fixed object reflection removed, which corresponds to the position of the object other than the fixed object.

Object sensing apparatus, object sensing method, and computer readable recording medium

An object detection apparatusincludes a plurality of transmitting unitsconfigured to emit a transmission signal, a receiving unitconfigured to mix the reception signal with a transmission signal to generate an IF signal, a spectrum calculation unitconfigured to calculate a spectrum that indicates a distribution of positions of the object, a section determination unitconfigured to determine sections for which a reflectance of the object is to be calculated, a reflectance distribution calculation unitconfigured to calculate, for each pair of a transmitting unit and the receiving unit, a reflectance of the object for each section, and calculate a product of the reflectance distributions over the sections, the reflectance distributions being calculated for the respective pairs, and an image generation unitconfigured to generate an image using a product of the reflectance distributions calculated for the respective pairs.

Apparatus, method, and computer-readable medium to generate an object image using correlation matrices

An object sensing apparatusincludes: an emission unitconfigured to emit an RF transmission signal as an electromagnetic wave for object sensing; a reception unitconfigured to receive a reflected wave of the RF transmission signal as an RF reception signal, and use the RF transmission signal to generate a demodulated signal based on the RF reception signal; a distance detection unitconfigured to detect a distance to the object that reflected the RF transmission signal based on the range spectrum calculated based on the demodulated signal; a behavior detection unitconfigured to detect behavior of the object based on the range spectrum; a fixed object specifying unitconfigured to specify a fixed object from among detected objects based on the distance and behavior; and a virtual image specifying unitconfigured to, if there are two or more objects other than the fixed object among the detected objects, calculate a degree of similarity in the change over time in the behavior for each combination of the objects other than the fixed object, and specify a virtual image based on the degree of similarity.

An object detection apparatusincludes: an emitting unitfor emitting an RF transmission signal; a receiving unitfor receiving, if the RF transmission signal is reflected off an object, the reflected RF transmission signal as an RF reception signal; an IF signal generating unitfor generating, in every period, a complex IF signal based on a signal obtained by mixing the RF transmission signal with the RF reception signal; a position detecting unitfor detecting the position of the object based on an evaluation function generated based on the complex IF signal generated in every period; and a displacement detecting unitfor detecting a displacement of the object based on the position of the object and the phase of complex reflectance of the object calculated based on the complex IF signal.

The object sensing device comprises a transmitter and a receiver. The transmitter includes an irradiation unit that irradiates an RF transmission signal having a periodically swept frequency. The receiver includes a reception unit that receives an RF reception signal being a reflected wave of the RF transmission signal reflected by the target, an IF signal generation unit that generates an IF signal by mixing the RF transmission signal with the RF reception signal, a position detection unit that detects a position of the target, based on amplitude of a one-dimensional spectrum calculated from the IF signal for each period in which the frequency is swept, and a displacement detection unit that detects displacement of the target, based on a phase of the one-dimensional spectrum at the detected position of the target.

Growing community of inventors

Tokyo, Japan

Shingo Yamanouchi