阅读说明：本技术 物品检测方法和装置 (Article detection method and apparatus ) 是由 底欣 张兆宇 田军 李磊 于 2018-06-04 设计创作，主要内容包括：本发明实施例提供一种物品检测方法和装置,其中,该方法包括：收发单元向待检测物品发送发射信号,并且接收该待检测物品反射后的反射信号；其中,该待检测物品相对预定轴摆动,该待检测物品在该轴的两侧产生沿径向方向相反的运动速度；对该发射信号和该反射信号进行处理,以获得特征信号；其中,该特征信号包含与预定距离对应的第一预定数量组速度值对应的信号强度值；该预定距离根据该待检测物品和该收发单元的距离确定；根据从该特征信号中提取的特征确定该待检测物品中所包含的物品。由此,能够利用非接触式的检测方法和装置,准确地实现藏匿于人身上的物品的检测,检测成本较低。(The embodiment of the invention provides an article detection method and device, wherein the method comprises the following steps: the transmitting and receiving unit transmits a transmitting signal to an article to be detected and receives a reflected signal reflected by the article to be detected; the article to be detected swings relative to a preset shaft, and the article to be detected generates opposite movement speeds along the radial direction on two sides of the shaft; processing the transmitted signal and the reflected signal to obtain a characteristic signal; wherein the characteristic signal comprises a signal intensity value corresponding to a first predetermined number of sets of velocity values corresponding to a predetermined distance; the preset distance is determined according to the distance between the article to be detected and the transceiving unit; and determining the articles contained in the articles to be detected according to the features extracted from the feature signals. Therefore, the non-contact detection method and the non-contact detection device can be used for accurately detecting the articles hidden on the human body, and the detection cost is low.)

1. An article detection apparatus, wherein the apparatus comprises: the device comprises a transceiving unit, a processing unit and a determining unit;

the transmitting and receiving unit transmits a transmitting signal to an article to be detected and receives a reflected signal reflected by the article to be detected; the article to be detected swings relative to a preset shaft, and the article to be detected generates opposite movement speeds along the radial direction on two sides of the shaft;

a processing unit for processing the transmission signal and the reflection signal to obtain a characteristic signal; wherein the characteristic signal comprises a signal strength value corresponding to a first predetermined number of sets of velocity values corresponding to a predetermined distance; each set of speed values comprises a second preset number of speed values, the speed values are equal to integral multiples of the radial speed resolution of the transceiving unit, and the preset distance is determined according to the distance between the article to be detected and the transceiving unit;

a determination unit for determining the items contained in the items to be detected according to the features extracted from the feature signals.

2. The apparatus of claim 1, wherein the processing unit comprises:

a preprocessing module, configured to perform frequency mixing sampling on the transmit signal and the reflected signal to obtain a first predetermined number of baseband signal matrices, where the transmit signal is a periodic signal; wherein the number of rows of a baseband signal matrix is equal to the second predetermined number, each row representing a baseband signal value of a sampling point of one period; the column number of the baseband signal matrix is equal to a third preset number, and the third preset number is the number of sampling points of the baseband signal in one period;

the transformation module is used for performing Fourier transformation on each baseband signal matrix line by line to obtain a first signal matrix containing the signal intensity values of the second preset number corresponding to the distances of the third preset number respectively; performing Fourier transform on each first signal matrix column by column to obtain a second signal matrix containing signal intensity values corresponding to the second predetermined number of velocity values respectively corresponding to the third predetermined number of distances;

a selection module for selecting, for each second signal matrix, a signal strength value corresponding to a set of speed values corresponding to the predetermined distance from the third predetermined number of distances to obtain the characteristic signal.

3. The apparatus according to claim 2, wherein the selection module combines signal strength values corresponding to the second predetermined number of velocity values corresponding to the predetermined distance selected from a first predetermined number of second signal matrices to form a feature matrix as the feature signal, the feature matrix having a number of columns equal to the first predetermined number, a number of rows equal to the second predetermined number, each of the columns corresponding to a signal strength value corresponding to the second predetermined number of velocity values selected from one of the second signal matrices.

4. The apparatus of claim 1, wherein the determining unit comprises:

a conversion module for converting the characteristic signal into a micro-Doppler map;

an extraction module for extracting the features from the micro-doppler plot;

a determination module for determining the items contained in the items to be detected according to the characteristics.

5. The apparatus of claim 4, wherein the determination module compares the features to features in a pre-obtained training set to determine the items contained in the items to be detected.

6. The apparatus according to claim 4, wherein the extraction module extracts, as the feature, a sample point in the micro-Doppler graph whose velocity value is not 0 and whose signal intensity value is greater than a third threshold value, and multiplies the velocity value by the signal intensity value or the signal intensity value of the sample point.

7. The apparatus of claim 4, wherein the means for determining further comprises:

a denoising module for denoising the micro-Doppler map; the extraction module extracts features from the micro Doppler image processed by the noise reduction module;

a normalization module for performing normalization processing on the extracted features; and the determining module determines the articles contained in the articles to be detected according to the features after the normalization processing.

8. The apparatus of claim 7, wherein the noise reduction module removes sample points in the micro-Doppler map having signal intensity values above a first threshold and/or below a second threshold.

9. An item detection method, wherein the method comprises:

the transmitting and receiving unit transmits a transmitting signal to an article to be detected and receives a reflected signal reflected by the article to be detected; the article to be detected swings relative to a preset shaft, and the article to be detected generates opposite movement speeds along the radial direction on two sides of the shaft;

processing the emission signal and the reflection signal to obtain a characteristic signal; wherein the characteristic signal comprises a signal strength value corresponding to a first predetermined number of sets of velocity values corresponding to a predetermined distance; each set of speed values comprises a second preset number of speed values, the speed values are equal to integral multiples of the radial speed resolution of the transceiving unit, and the preset distance is determined according to the distance between the article to be detected and the transceiving unit;

and determining the articles contained in the articles to be detected according to the features extracted from the feature signals.

10. The method of claim 9, wherein processing the transmitted signal and the reflected signal to obtain a signature signal comprises:

mixing and sampling the transmitting signal and the reflected signal to obtain a first preset number of baseband signal matrixes, wherein the transmitting signal is a periodic signal; wherein the number of rows of a baseband signal matrix is equal to the second predetermined number, each row representing a baseband signal value of a sampling point of one period; the column number of the baseband signal matrix is equal to a third preset number, and the third preset number is the number of sampling points of the baseband signal in one period;

performing Fourier transform on each baseband signal matrix line by line to obtain a first signal matrix containing signal intensity values of the second preset number respectively corresponding to the distances of the third preset number; performing Fourier transform on each first signal matrix column by column to obtain a second signal matrix containing signal intensity values corresponding to the second predetermined number of velocity values respectively corresponding to the third predetermined number of distances;

for each second signal matrix, selecting a signal strength value corresponding to a set of speed values corresponding to the predetermined distance from the third predetermined number of distances to obtain the characteristic signal.

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for detecting an article.

Background

In recent years, the safety problem in public places is more and more emphasized, and how to detect dangerous goods such as control instruments, flammable and explosive goods and the like becomes an important problem. At present, the detection device to the hazardous articles wide application in various intensive occasions of personnel such as airport, railway station, subway station, stadium, the hazardous articles detection device can divide into two types: contact and contactless. Contact detection devices require that a suspicious object (e.g., a bottle containing a liquid) be placed on the detection device for detection, while non-contact detection devices are capable of initiating detection and distinguishing whether the suspicious object is a dangerous object when the suspicious object moves within a certain range of the detection device.

It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the invention.

Disclosure of Invention

At present, aiming at a non-contact detection device, one of common detection methods is an X-ray detection method, but the method is generally high in cost, and long-term use of the method can affect the physical health of workers; in addition, because different articles are made of different materials, the reflection characteristics of the articles are different, and the difference can be used for detecting the articles, namely, a sensor is arranged to transmit signals to the articles to be detected, and the intensity of the reflected signals of the articles to be detected is utilized to realize object detection; however, since dangerous goods are often hidden on human body, the intensity of the reflected signal received by the sensor is interfered by human body, so that the reflection characteristic of the object to be detected cannot be accurately reflected, and the object to be detected is missed and mistakenly detected.

The embodiment of the invention provides an article detection method and device, which can accurately realize the detection of articles hidden on a human body by using a non-contact detection method and device and have lower detection cost.

According to a first aspect of embodiments of the present invention, there is provided an article detection apparatus, wherein the apparatus comprises: the device comprises a transceiving unit, a processing unit and a determining unit;

the transmitting and receiving unit transmits a transmitting signal to an article to be detected and receives a reflected signal reflected by the article to be detected; the article to be detected swings relative to a preset shaft, and the article to be detected generates opposite movement speeds along the radial direction on two sides of the shaft;

a processing unit for processing the transmission signal and the reflection signal to obtain a characteristic signal; wherein the characteristic signal comprises a signal intensity value corresponding to a first predetermined number of sets of velocity values corresponding to a predetermined distance; each set of speed values comprises a second preset number of speed values, the speed values are equal to integral multiples of the radial speed resolution of the transceiving unit, and the preset distance is determined according to the distance between the article to be detected and the transceiving unit;

a determination unit for determining the items contained in the items to be detected according to the features extracted from the feature signals.

According to a second aspect of embodiments of the present invention, there is provided an article detection method, wherein the method includes:

the transmitting and receiving unit transmits a transmitting signal to an article to be detected and receives a reflected signal reflected by the article to be detected; the article to be detected swings relative to a preset shaft, and the article to be detected generates opposite movement speeds along the radial direction on two sides of the shaft;

processing the transmitted signal and the reflected signal to obtain a characteristic signal; wherein the characteristic signal comprises a signal intensity value corresponding to a first predetermined number of sets of velocity values corresponding to a predetermined distance; each set of speed values comprises a second preset number of speed values, the speed values are equal to integral multiples of the radial speed resolution of the transceiving unit, and the preset distance is determined according to the distance between the article to be detected and the transceiving unit;

and determining the articles contained in the articles to be detected according to the features extracted from the feature signals.

The embodiment of the invention has the advantages that the object hidden on the human body is detected by utilizing the influence of the swing of the object, which is generated along with the walking of the human body, on the reflected signal of the object, so that the object hidden on the human body can be accurately detected by utilizing a non-contact detection method and a non-contact detection device, and the detection cost is lower.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

Many aspects of the invention can be better understood with reference to the following drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. For convenience in illustrating and describing some parts of the present invention, corresponding parts may be enlarged or reduced in the drawings. Elements and features depicted in one drawing or one embodiment of the invention may be combined with elements and features shown in one or more other drawings or embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views, and may be used to designate corresponding parts for use in more than one embodiment.

In the drawings:

FIG. 1 is a schematic view of an article detection apparatus according to the present embodiment 1;

FIG. 2 is a schematic diagram of the microwave sensor transmitting signals;

FIG. 3 is a schematic view illustrating the swing of the object to be detected in the embodiment 1;

FIG. 4 is a schematic view showing the constitution of a processing unit in the present embodiment 1;

FIG. 5 is a schematic view showing the constitution of the determining unit in the present embodiment 1;

FIG. 6A is a micro Doppler diagram in the present example 1;

FIG. 6B is a schematic diagram of the micro-Doppler spectrum denoising processing in this embodiment 1;

FIGS. 6C-6D are schematic diagrams of the feature extraction in this example 1;

fig. 7-8 are corresponding micro-doppler plots for the pistol and the handset of the embodiment 1;

fig. 9 is a schematic diagram of the hardware configuration of the article detection apparatus in embodiment 2;

FIG. 10 is a flowchart of the method for detecting an article according to embodiment 3;

FIG. 11 is a flowchart of a method implemented in step 1102 of this embodiment 3;

fig. 12 is a flowchart of a method implemented in step 1103 in this embodiment 3.

Detailed Description

The foregoing and other features of embodiments of the present invention will become apparent from the following description, taken in conjunction with the accompanying drawings. These embodiments are merely exemplary and are not intended to limit the present invention. In order to enable those skilled in the art to easily understand the principle and the implementation manner of the present invention, the embodiment of the present invention is described by taking the example of transmitting the microwave signal, but it is understood that the embodiment of the present invention is not limited to transmitting the microwave signal.

The following describes a specific embodiment of the present invention with reference to the drawings.