A method and system for in-vehicle living body detection

Abstract

The application provides a kind of in-vehicle living body detection method, the method comprises the following steps: (1) in the case where vehicle is off, and the vehicle door and sunroof are in the closed state, activate the living body detection function of vehicle;(2) control the transmitting end to continuously emit electromagnetic wave, and the receiving end detects whether there is living body in the vehicle based on the parameter of received electromagnetic wave.The application mainly realizes the living body monitoring in the vehicle through the change of electromagnetic wave signal, and the monitoring method is not only sensitive, but also relatively low in cost, and is beneficial to the privacy protection of user, and can also realize the in-vehicle living body detection in the case where there is an obstruction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile design, and provides an in-vehicle living body detection method and system. BACKGROUND

[0002] In recent years, many car owners leave children or pets in the car after parking and turning off the engine, especially in high-temperature environments, which can easily cause loss of life and property.

[0003] There is currently a living body detection method based on millimeter wave radar in the industry, application number 201910721347.8, patent name: a method for preventing and monitoring the danger of leaving children in the car, the millimeter wave radar sensor in the in-vehicle vital sign monitoring system scans the environment in the car, if no life activity is found, it means that there is no person in the car at this time, and the in-vehicle vital sign monitoring system does not need to monitor the life. At this time, the in-vehicle system is controlled to enter sleep mode, which can reduce unnecessary energy consumption, but the cost of millimeter wave radar is too high, and the coverage area is limited.

[0004] There is also a living body detection method using vision in the industry, such as using a camera to identify the living body in the car, but there is a risk of privacy leakage and the problem of recognition failure caused by obstruction. SUMMARY

[0005] In view of this, the present application provides an in-vehicle living body detection method to improve the above problems.

[0006] Specifically, the technical scheme includes the following:

[0007] On the one hand, the present application provides an in-vehicle living body detection method, which includes the following steps:

[0008] (1) activating the living body detection function of the vehicle when the vehicle is turned off and the doors and sunroof are closed;

[0009] (2) controlling the transmitting end to continuously emit electromagnetic waves, and the receiving end detecting whether there is a living body in the car based on the parameters of the received electromagnetic waves.

[0010] In some embodiments, the parameters of the electromagnetic wave signal include phase, amplitude and frequency.

[0011] In some embodiments, the living body detection method based on the received electromagnetic waves is as follows:

[0012] (21) selecting the electromagnetic wave I of the main path from the received electromagnetic wave;

[0013] (22) If the parameters of the electromagnetic wave I are not located in the parameter interval of each main path within the set time length, and the parameters of the electromagnetic wave signal I fluctuate, it is determined that there is a living body in the vehicle.

[0014] In some embodiments, the parameter interval marking method of the main path Li is as follows:

[0015] The vehicle door and window are controlled to be closed, and in the case that there is no other object in the vehicle, the transmitting end transmits the electromagnetic wave, and the parameters of the main path Li collected by the receiving end are taken as the standard parameter value, and the allowable deviation of the standard parameter value forms the parameter interval of the main path Li.

[0016] In some embodiments, the standard parameter collection method of the main path Li is as follows:

[0017] The area outside the main path Li is magnetically shielded, at this time, the receiving end detects only the electromagnetic wave signal transmitted through the main path Li, detects the parameter value of the received electromagnetic wave signal, and takes the mean value of the parameters of the received electromagnetic wave signal collected as the standard parameter value of the main path Li.

[0018] In some embodiments, the main path is set as the path passing through the child seat.

[0019] In some embodiments, the electromagnetic wave signal I screening method of the main path is as follows:

[0020] The current received electromagnetic wave signal is input into the trained filtering model, and the filtering model outputs the parameters of the electromagnetic wave of the main path;

[0021] The filtering model is composed of a sparse matrix and a Gaussian filtering model, and the filtering model is trained based on samples, and the construction process of the sample is as follows:

[0022] A living body is placed on each main path, and the receiving end collects the electromagnetic wave passing through the main path with the living body, and extracts the parameters of the electromagnetic wave as samples.

[0023] On the other hand, the embodiments of the present application provide a vehicle living body detection system, the system comprises:

[0024] The transmitting end, the receiving end, and the processing unit in communication connection with the receiving end, the processing unit can be independently set, or can be integrated in the receiving end, and the processing unit performs living body detection in the vehicle based on the above vehicle living body detection method.

[0025] In some embodiments, the transmitting end is a car WiFi module.

[0026] In some embodiments, the transmitting end is arranged at the front end of the vehicle, and the receiving end is arranged at any one of the rear air conditioning port, the rear reading lamp, the open trunk or the door panel.

[0027] This invention mainly uses changes in electromagnetic wave signals to achieve liveness detection inside the vehicle. This detection method is not only sensitive and relatively low in cost, but also beneficial to the protection of user privacy, and can achieve liveness detection inside the vehicle even when there is obstruction. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a flowchart of the in-vehicle liveness detection method provided in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the in-vehicle liveness detection system provided in an embodiment of the present invention;

[0031] Figure 3 A schematic diagram showing the arrangement of the receiving end and the transmitting end according to an embodiment of the present invention;

[0032] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by those skilled in the art. To make the technical solutions and advantages of this application clearer, the embodiments of this application will be further described in detail below with reference to the accompanying drawings. The flow of the in-vehicle liveness detection method is as follows: Figure 1 The process includes the following steps:

[0035] (1) Activate the vehicle's liveness detection function when the vehicle is turned off and the doors and sunroof are closed.

[0036] (2) controlling the transmitting end to continuously emit electromagnetic waves, and detecting whether there is a living body in the vehicle based on parameters of the received electromagnetic waves, the electromagnetic wave parameters including phase, amplitude and frequency;

[0037] In the embodiment of the present application, the living body detection method based on the received electromagnetic wave signal is specifically as follows:

[0038] (21) selecting the electromagnetic wave signal I of the main path from the received electromagnetic wave signal;

[0039] (22) if the parameters of the electromagnetic wave signal I are not located in the parameter interval of each main path within the set time length, and the parameters of the electromagnetic wave signal I fluctuate, it is determined that there is a living body in the vehicle.

[0040] Since the parameter interval of the main path is the parameter interval detected in the case that there is no living body in each main path of the vehicle, if there is a living body in the main path, the parameters of the electromagnetic wave received by the receiving end will change greatly compared with the electromagnetic wave passing through the main path without a living body, but only the change of the parameters of the received electromagnetic wave cannot indicate that there is a living body in the main path, but only indicates that there is an object in the main path, if the object is a living body, the object will generally move within the set time length, at this time, the reaction to the received electromagnetic wave is that the parameters of the received electromagnetic wave fluctuate, therefore, if the parameters of the received electromagnetic wave are not located in the parameter interval of each main path within the set time length, and the parameters of the electromagnetic wave fluctuate, it is determined that there is a living body in the vehicle.

[0041] Before use, the parameter interval of each main path needs to be calibrated, and the parameter interval of the main path needs to be calibrated one by one, that is, if four main paths passing through the front two seats and the rear two seats are set in the vehicle, four times of parameter interval calibration of the main path are needed, the parameter interval calibration method of one main path is described below, the parameter interval calibration method of the main path Li is specifically as follows:

[0042] The doors and windows of the vehicle are controlled to be closed, and in the case that there is no other object in the vehicle, the transmitting end is controlled to emit electromagnetic waves, and the parameter value of the main path Li collected by the receiving end is taken as the standard parameter value, and the allowable deviation of the standard parameter value forms the parameter interval of the main path Li, including the phase interval, the amplitude interval and the frequency interval.

[0043] In the embodiment of the present application, the standard parameter collection method of the main path Li is specifically as follows:

[0044] The area outside the main path Li is magnetically shielded, at this time, the receiving end detects only the electromagnetic wave signal propagating through the main path Li, detects the parameter value of the received electromagnetic wave signal, and takes the mean value of the collected multiple groups of parameter values of the received electromagnetic wave signal as the standard parameter value of the main path Li.

[0045] In the embodiment of the present application, the main path can have multiple paths or one path, and the sitting position of the child is arranged at the passing position of the main path. Of course, each sitting position can be arranged at the passing position of multiple main paths, and one main path only passes one sitting position.

[0046] In the embodiment of the present application, the electromagnetic wave signal I screening method of the main path is specifically as follows:

[0047] The current received electromagnetic wave signal is input into the trained filtering model, and the filtering model outputs the phase, amplitude and frequency of the electromagnetic wave of the main path.

[0048] The filtering model is composed of a sparse matrix and a Gaussian filtering model, and the filtering model is trained based on samples. The construction process of the sample is specifically as follows:

[0049] A living body is placed on each main path, and the receiving end collects the electromagnetic wave passing through the main path with the living body, extracts the parameters of the electromagnetic wave as samples, and trains the filtering model. The trained filtering model is used for noise electromagnetic wave identification, and the filtering model only outputs the phase, amplitude and frequency of the electromagnetic wave on the main path.

[0050] It should be noted that if the difference between one of the phase, amplitude and frequency of the electromagnetic wave signal I at the current time and the previous time is greater than the set standard difference value, it is determined that the electromagnetic wave signal I fluctuates.

[0051] In the embodiment of the present application, after step (2), the following steps are further included:

[0052] (3) If a living body is detected in the vehicle, a warning is issued. It should be noted that the warning is upgraded as time goes on, including: initial warning, upgraded warning, intervention, which are specifically as follows:

[0053] Initial warning: When the vehicle door and window are in a closed state, the door is locked to trigger the living body detection. If a living body is detected in the vehicle, the initial warning is triggered within 10 seconds after the vehicle is locked, and the warning mode lasts at least 3 seconds or more. The initial warning can be delayed by the driver pressing the button for a maximum of 10 minutes, and must be triggered;

[0054] Upgraded warning: After the initial warning ends, all doors are still closed, and a living body is detected in the vehicle. The upgraded warning is triggered within 90 seconds after the initial warning ends, and the upgraded warning must be triggered within 15 minutes of locking the door, and lasts at least 15 seconds.

[0055] Intervention: Triggered at 10 minutes after locking the vehicle, or 5 minutes after the first upgraded warning

[0056] Figure 2A structure schematic diagram of the in-vehicle living body detection system provided by the embodiment of the present application is shown, only parts related to the embodiment of the present application are shown for convenience of description, and the system comprises:

[0057] The transmitting end, the receiving end, and a processing unit in communication connection with the receiving end, the processing unit can be independently arranged or integrated in the receiving end, and the processing unit performs in-vehicle living body detection based on the in-vehicle living body detection method.

[0058] In the embodiment of the present application, the transmitting end is a car WiFi module or a WiFi module independently arranged, which can reduce the dependence of the car WiFi module, avoid multiple reuse of the car WiFi, cause unstable signal, and improve the robustness of the WiFi living body detection.

[0059] In the embodiment of the present application, the transmitting end and the receiving end can be integrally designed or separately designed, the transmitting end is arranged at the front end of the vehicle, and the receiving end is arranged at any one position of the rear air conditioning port, the rear reading lamp, the open trunk or the door panel, such as Figure 3 S1, S2 and S3 shown in FIG. 1, the specific installation is set according to the vehicle type, and the power supply demand can be met.

[0060] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The present application is intended to cover any variations, uses or adaptive changes of this application following the general principles thereof and including those expressly stated or implied herein. The specification and examples are to be regarded as exemplary only.

[0061] It should be understood that the present application is not limited to the precise structures described and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method of in-vehicle living body detection, characterized by, The method comprises the following steps: (1) activating the living body detection function of the vehicle when the vehicle is turned off and the doors and sunroof are closed; (2) controlling the transmitting end to continuously emit electromagnetic waves, and the receiving end to detect whether there is a living body in the vehicle based on parameters of the received electromagnetic waves; The parameters of the electromagnetic wave signal include phase, amplitude and frequency; The living body detection method based on the received electromagnetic waves is as follows: (21) selecting electromagnetic wave I of the main path from the received electromagnetic waves; (22) if the parameters of electromagnetic wave I are not located in the parameter interval of each main path within a set time length, and the parameters of electromagnetic wave signal I fluctuate, it is determined that there is a living body in the vehicle; The parameter interval calibration method of the main path Li is as follows: Control the doors and windows of the vehicle to be closed, and control the transmitting end to emit electromagnetic waves under the condition that there is no other object in the vehicle, take the parameters of the main path Li collected by the receiving end as the standard parameter value, and the allowable deviation of the standard parameter value forms the parameter interval of the main path Li; The standard parameter collection method of the main path Li is as follows: Magnetic shielding is performed on the area outside the main path Li, at this time, the receiving end detects only the electromagnetic wave signal propagated through the main path Li, detects the parameter value of the received electromagnetic wave signal, and takes the mean value of the collected multiple groups of parameter values of the received electromagnetic wave signal as the standard parameter value of the main path Li.

2. The in-vehicle liveness detection method as described in claim 1, characterized in that, The main path is set as the path passing through the child seat.

3. The in-vehicle liveness detection method as described in claim 1, characterized in that, The electromagnetic wave signal I selection method of the main path is as follows: Input the currently received electromagnetic wave signal into the trained filtering model, and the filtering model outputs the parameters of the electromagnetic wave of the main path; The filtering model is composed of a sparse matrix and a Gaussian filtering model, and the filtering model is trained based on samples, and the construction process of the samples is as follows: Place a living body on each main path, and the receiving end collects the electromagnetic wave passing through the main path with the living body, and extracts the parameters of the electromagnetic wave as samples.

4. An in-vehicle living body detection system characterized by comprising: The system comprises: The transmitting end, the receiving end, and the processing unit in communication connection with the receiving end, the processing unit can be independently set, or can be integrated in the receiving end, and the processing unit performs living body detection in the vehicle based on the vehicle living body detection method in any one of claims 1 to 3.

5. The in-vehicle vital detection system of claim 4, wherein, The transmitting end is a vehicle WiFi module.

6. The in-vehicle vital detection system of claim 4, wherein, The transmitting end is arranged at the front end of the vehicle, and the receiving end is arranged at any one of the rear air conditioning port, the rear reading lamp, the open trunk or the door panel.

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