WO2023103860A1

WO2023103860A1 - Drug-taking detection method, apparatus and device, and storage medium

Info

Publication number: WO2023103860A1
Application number: PCT/CN2022/135743
Authority: WO
Inventors: 彭程; 郭秀花; 周军
Original assignee: 深圳爱酷智能科技有限公司; 北京眼神智能科技有限公司; 北京眼神科技有限公司
Priority date: 2021-12-10
Filing date: 2022-12-01
Publication date: 2023-06-15
Also published as: CN114187647A

Abstract

A drug-taking detection method, apparatus and device, and a storage medium, which relate to drug-taking detection technology. The method comprises: acquiring a primarily screened iris image of a person subjected to detection, determining an iris-pupil diameter ratio in the primarily screened iris image, and determining, on the basis of the iris-pupil diameter ratio, whether said person is a drug-taking suspect, wherein the iris-pupil diameter ratio is the ratio of the iris diameter to the pupil diameter of said person (S11); when said person is a drug-taking suspect, acquiring a plurality of finely screened iris images of said person within a flicker time period of a fill-in light, and determining the change rate of the iris-pupil diameter ratio of said person on the basis of the plurality of finely screened iris images (S12); and on the basis of the change rate of the iris-pupil diameter ratio, determining whether said person is a drug addict (S13).

Description

Drug abuse detection method, device, equipment and storage medium

related application

This application claims priority to a Chinese patent application with application number 202111510567X and titled "Method, Device, Equipment, and Storage Medium for Drug Abuse Detection" filed with the China Patent Office on December 10, 2021, the entire contents of which are incorporated herein by reference. Applying.

technical field

The present application relates to the technical field of drug abuse detection, in particular, to a drug abuse detection method, device, equipment and storage medium.

Background technique

At present, the screening of drug addicts is mainly based on the results of biochemical analysis of the testee's urine or blood. Suspicious drug addicts are judged by the naked eye based on the experience of inspectors in crowded places such as stations, docks, airports, customs or shopping malls. It takes a lot of manpower and time, and there is a problem of low detection accuracy when detecting suspected drug users.

Contents of the invention

In the first aspect, the embodiment of the present application provides a drug abuse detection method, the method comprising:

Collecting the primary screening iris image of the detected person, determining the iris-pupil diameter ratio in the primary screening iris image, determining whether the detected person is a drug suspect based on the iris-pupil diameter ratio, and the iris-pupil diameter ratio is The ratio of the detected person's iris diameter to pupil diameter;

When the detected person is a suspected drug addict, acquire a plurality of fine-screened iris images of the detected person within the flashing time period of the supplementary light, and determine the detected person based on a plurality of the fine-screened iris images The rate of change of iris-to-pupil diameter ratio; and

It is determined whether the detected person is a drug addict based on the change rate of the iris-to-pupil diameter ratio.

Before the primary screening iris image of the described acquisition subject, the method also includes:

Detect ambient light intensity;

The collecting the primary screening iris image of the subject, determining the iris-pupil diameter ratio in the primary screening iris image, and determining whether the subject is a drug suspect based on the iris-pupil diameter ratio include:

Based on the ambient light intensity, the supplementary light is controlled to perform supplementary light, so as to obtain the primary screening iris image;

determining the iris-to-pupil diameter ratio of the subject based on the primary screening iris image; and

When the iris-to-pupil diameter ratio is outside the standard iris-to-pupil diameter ratio range under the same light intensity, it is determined that the detected person is a suspected drug addict.

In one embodiment, the detection of ambient light intensity includes:

Detect the distance between the detected person and the portrait camera;

When the distance is less than a preset distance, based on the portrait camera, the face area of the detected person is photographed to obtain a face image;

Light intensity analysis is performed on the face image to obtain the ambient light intensity.

In one embodiment, the flickering light intensity of the second supplementary light is higher than the ambient light intensity.

Said collecting the primary screening iris image of the detected person, and determining the iris-pupil diameter ratio in the primary screening iris image comprises:

Obtain the face image of the detected person based on the face camera, locate the position of the human eye, determine the first difference between the position of the human eye and the position of the standard human eye, and control the iris camera to rotate the first difference according to the first difference. an angle;

Locate the iris position based on the iris image collected by the iris camera, determine a second difference between the iris position and a standard iris position, and control the iris camera to rotate a second angle according to the second difference; and

The primary screening iris image is collected based on the rotated iris camera, and the iris-to-pupil diameter ratio in the primary screening iris image is determined.

In one embodiment, before the acquisition of the primary screening iris image of the subject, the method further includes:

Carry out emotion analysis on the face in the face image, and obtain the emotion analysis result;

When the emotional analysis result shows that the detected person is emotionally excited, sending a prompt message to calm the detected person; and

When the emotional analysis result shows that the detected person's emotion is in a stable state, it is determined to collect the primary screening iris image of the detected person.

In one embodiment, before determining whether the subject is a drug suspect based on the iris-to-pupil diameter ratio, the method further includes:

Performing image detection on the face image and the ID card database to determine the age of the detected person; and

Obtaining an age-standard iris-to-pupil diameter ratio range corresponding to the age of the detected person;

The determining whether the detected person is a drug suspect based on the iris-to-pupil diameter ratio includes: when the iris-to-pupil diameter ratio is outside the age-standard iris-to-pupil diameter ratio range, determining that the detected person is drug suspect.

In the second aspect, the embodiment of the present application provides a drug abuse detection device, the device may include:

The primary screening module is used to collect the primary screening iris image of the detected person, determine the iris-pupil diameter ratio in the primary screening iris image, and determine whether the detected person is a drug suspect based on the iris-pupil diameter ratio. The iris-to-pupil diameter ratio is the ratio of the detected person's iris diameter to the pupil diameter;

The fine screening module is used to acquire a plurality of fine screening iris images of the detected person during the flashing time period of the supplementary light when the detected person is a drug suspect, based on a plurality of the fine screening iris images Determining the change rate of the iris-to-pupil diameter ratio of the detected person; determining whether the detected person is a drug addict based on the change rate of the iris-to-pupil diameter ratio.

In one embodiment, the drug abuse detection device may also include:

The light control module is used to detect the intensity of the ambient light, and control the first supplementary light to supplement the light based on the intensity of the ambient light, so that the iris camera can acquire the iris image of the detected person.

The primary screening module can be used to control the supplementary light to perform supplementary light based on the ambient light intensity, so as to obtain the primary screening iris image; determine the iris-pupil diameter ratio of the subject based on the primary screening iris image; and When the iris-to-pupil diameter ratio is outside the standard iris-to-pupil diameter ratio range under the same light intensity, it is determined that the detected person is a drug suspect.

In one embodiment, the light control module can be used to detect the distance between the detected person and the portrait camera; when the distance is less than a preset distance, the face area of the detected person is photographed based on the portrait camera, Obtaining a face image; performing light intensity analysis on the face image to obtain the ambient light intensity.

In one embodiment, the preliminary screening module can be used to acquire the face image of the subject based on the face camera, locate the position of the human eye, determine the first difference between the position of the human eye and the standard human eye position, and The first difference controls the iris camera to rotate the first angle; locates the iris position based on the iris image collected by the iris camera, determines the second difference between the iris position and the standard iris position, and controls the iris according to the second difference The iris camera rotates by a second angle; and based on the iris camera capturing the primary screening iris image after rotation, determining the iris-to-pupil diameter ratio in the primary screening iris image.

In one embodiment, the drug use detection device may also include an emotion detection module, which is used to perform emotion analysis on the face in the face image to obtain an emotion analysis result; when the emotion analysis result shows that the detected person's emotion is excited state, send a reminder message to calm down the subject; and when the emotional analysis result shows that the subject’s emotion is in a stable state, determine to collect the primary screening iris image of the subject .

In one embodiment, the drug use detection device may also include an age detection module, which is used to perform image detection on the face image and the ID card database to determine the age of the detected person; and obtain the age corresponding to the detected person. Age-standard iris pupil diameter ratio range;

The primary screening module can be used to determine that the subject is a suspected drug addict when the iris-to-pupil diameter ratio is outside the age-standard iris-to-pupil diameter ratio range.

In the third aspect, the embodiment of the present application provides a drug use detection device, including:

Face camera for collecting face images;

Iris camera for collecting iris images;

The supplementary light is set outside the drug detection equipment or around the iris camera;

a memory storing computer program instructions; and

A processor, when the processor executes the computer program instructions, executes the steps in any of the above implementation manners.

In a fourth aspect, the embodiment of the present application further provides a computer-readable storage medium, where computer program instructions are stored in the readable storage medium, and when the computer program instructions are read and executed by a processor, the above-mentioned tasks are executed. A step in an implementation manner.

The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below. Other features, objects and advantages of the invention will be apparent from the description, drawings and claims.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings that need to be used in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, so It should not be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings according to these drawings without creative work.

FIG. 1 is a schematic diagram of the steps of a drug detection method provided by an embodiment of the present application;

Fig. 2 is a schematic diagram of the drug use detection steps adapted to different light brightness environments provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of steps for detecting ambient light intensity provided by an embodiment of the present application;

FIG. 4 is a schematic diagram of steps for determining the iris-to-pupil diameter ratio provided by an embodiment of the present application;

FIG. 5 is a schematic diagram of steps for judging whether to perform detection based on the emotion of the person being tested according to an embodiment of the present application;

FIG. 6 is a schematic diagram of the steps of an age-based drug use discrimination method provided by an embodiment of the present application;

Fig. 7 is a schematic diagram of a drug use detection device provided by an embodiment of the present application;

Fig. 8 is a schematic diagram of a drug abuse detection device provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. For example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, program segment, or part of code that includes one or more Executable instructions. It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. It should also be noted that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by a dedicated hardware-based system that performs the specified function or action , or may be implemented by a combination of dedicated hardware and computer instructions. In addition, each functional module in each embodiment of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

During the course of the applicant's research, the applicant found that the pupil will expand or shrink after being stimulated by different light sources, but the changes in the pupil are controlled by the sympathetic and parasympathetic nerves in the oculomotor nerve. The influence of the human body on the cerebral cortex after taking drugs is irreversible. The response of the brain to the control of pupil contraction and relaxation is significantly different from that of people who have not taken drugs. Biochemical analysis of the tester's urine or blood to determine whether the testee is taking drugs.

However, in the current detection tools that use the zoom speed of the pupils to light stimulation to determine whether drug use requires the subject to actively place his eyes in the human eye collection area of the detection tool, it requires a high degree of cooperation from the subject, which is likely to cause detection The rebellious or evasive psychology of the tester reduces the collection pass rate and detection efficiency.

Therefore, the embodiment of the present application provides a method for detecting drug use. First, the drug users are initially screened according to the ratio of the iris diameter to the pupil diameter and the standard ratio. Collect multiple iris images of the detected person, and further judge whether the suspect is taking drugs according to the change rate of the pupil diameter in the multiple iris images, thereby improving the detection efficiency and the experience of the detected person. Please refer to Figure 1, Figure 1 is a schematic diagram of the steps of a drug detection method provided in the embodiment of the present application, the method may include the following steps:

In step S11, the primary screening iris image of the subject is collected, the iris-to-pupil diameter ratio in the primary screening iris image is determined, and based on the iris-to-pupil diameter ratio, it is determined whether the subject is a drug suspect, the The iris-to-pupil diameter ratio is the ratio of the detected person's iris diameter to the pupil diameter.

In step S12, when the subject is a suspected drug addict, obtain a plurality of fine-screened iris images of the subject during the flashing time period of the fill light, and determine based on the plurality of fine-screened iris images The rate of change of the iris-to-pupil diameter ratio of the detected subject.

In step S13, it is determined whether the detected person is a drug addict based on the change rate of the iris-to-pupil diameter ratio.

Wherein, the pupil diameter corresponding to each iris image in the flickering time period is acquired, and the pupil diameter change rate of the pupil diameter in the flickering time period can be obtained with time as a dimension. Under different ambient light intensities, the range of pupil diameter change rate of normal people is certain, that is, the standard pupil diameter change rate range is determined, and the standard pupil diameter change rate range is obtained based on historical experience and human physiological structure. The pupil diameter change curve can be obtained by fitting the time as the horizontal axis and the pupil diameter as the vertical axis, and the pupil diameter change rate can be further obtained. When the pupil diameter change rate exceeds the standard pupil diameter change rate range corresponding to the ambient light intensity, it indicates that the pupil diameter change of the drug suspect is different from that of normal people, and the drug suspect can be determined to be a high-probability drug addict.

Exemplarily, in step S12, the rate of change of the iris-pupil diameter ratio may take time as the abscissa and the pupil diameter as the ordinate, and the curvature of the pupil diameter change curve is obtained by fitting, if the curvature is within the set threshold range, then It is determined that the detected person is a suspected drug addict, otherwise he is not drug addicted.

It can be seen that in the embodiment of the present application, the drug users can be initially screened according to the ratio of the iris diameter to the pupil diameter and the standard ratio. Based on multiple iris images, it is further judged whether the suspect is taking drugs according to the change rate of the pupil diameter in the multiple iris images. Through the two-step screening method, it is possible to more accurately identify whether the testee is a drug addict, and for the testee who is not taking drugs, there is no need to use the flashing supplementary light to illuminate the testee, which improves the experience of the testee. At the same time, the embodiment of the present application uses the ratio of the iris diameter to the pupil diameter and the standard ratio to judge during the preliminary screening, without contact with the subject, and there is no need to set a lens barrel on the non-inductive drug use detection equipment, and no need for the cooperation of the subject , strong concealment, and is not easy to arouse the resentment of the detected person.

In another embodiment, the obtained iris-to-pupil diameter ratio, ambient light intensity, and pupil diameter change rate can be sent to a dedicated database for further analysis to obtain information such as the type of drugs that high-probability drug addicts may take, the length of time, and the smoking area. .

In an optional embodiment, the embodiment of the present application also provides a drug abuse detection method adapted to different light brightness environments, please refer to Figure 2, which shows the drug abuse detection steps adapted to different light brightness environments provided by the embodiment of the present application Schematic diagram, this embodiment may include the following steps:

In step S21, the ambient light intensity is detected before the acquisition of the primary screening iris image of the subject.

In step S22, a supplementary light is controlled to perform supplementary light based on the ambient light intensity, so as to obtain the primary screening iris image.

In step S23, the iris-to-pupil diameter ratio of the subject is determined based on the primary screening iris image.

In step S24, when the iris-to-pupil diameter ratio is outside the standard iris-to-pupil diameter ratio range under the same light intensity, it is determined that the detected person is a drug suspect.

Specifically, the ambient light sensor can be used to detect the ambient light intensity, and the ambient light intensity can also be judged through the face image collected by the face camera. The grayscale generation expression g=r×l obtains the ambient light intensity of the environment where the target face is located. Among them, r represents the reflectivity of the target face image, l represents the ambient light intensity of the environment where the target face is located, and g represents the grayscale of the target face image. The ambient light intensity can be divided into five levels according to the preset thresholds: dim light, relatively dim light, normal light, relatively bright light and bright light. However, the delineation of the ambient light intensity level is not unique and can be set according to the actual situation.

Exemplarily, the intensity of the flashing light is higher than the intensity of the ambient light, for example, the intensity of the flashing light may be higher than the intensity of the ambient light by one grade. This setting allows the human eye to adapt to collecting each iris image during the flashing time period, avoiding eye closure caused by the flashing brightness, resulting in iris image collection failure.

The corresponding standard ratio value under each light intensity can be stored in a database or a processor in advance. After calculating the ratio of the iris diameter to the pupil diameter of the subject under the current ambient light intensity, the standard ratio is transferred according to the ambient light intensity, and the ratio K of the subject's iris diameter to the pupil diameter is called When the ratio K exceeds the preset ratio range of the standard ratio (for example, the ratio K is greater than or less than 10 than the preset ratio), it is judged that the detected person is a drug suspect.

It can be seen that, in the embodiment of the present application, by collecting the ambient light intensity and controlling the supplementary light to supplement the iris camera based on the ambient light intensity, it is possible to control the luminous intensity of the stimulus lamp by adapting to the intensity of the surrounding ambient light without causing being blocked. The tester closes his eyes due to sudden strong light, so that the accuracy of iris image collection can be improved.

Further, the present application also provides an implementation step based on detecting the intensity of ambient light. Please refer to FIG. 3. FIG. 3 is a schematic diagram of steps for detecting the intensity of ambient light provided by an embodiment of the present application. The step of detecting the intensity of ambient light may include :

In step S31, the distance between the detected person and the portrait camera is detected.

In step S32, when the distance is less than a preset distance, the face area of the detected person is photographed based on the portrait camera to obtain a face image.

In step S33, light intensity analysis is performed on the face image to obtain the ambient light intensity.

Wherein, the distance between the person to be tested and the portrait camera can be obtained by means of infrared distance measurement, or the distance between the person to be tested and the portrait camera can be obtained through a sensor arranged on the bottom surface of the drug abuse detection device.

As an optional embodiment, it is also possible to capture the face of the person to be tested within the preset distance by setting the preset distance, so as to prevent the portrait lens from capturing the blurred portrait of the person outside the preset distance, and avoid the blurring of the portrait lens. Ineffective operation, improve the effectiveness of target face image acquisition through the portrait camera, and save power consumption of the device.

It can be seen that the embodiment of the present application obtains the ambient light intensity by analyzing the light intensity of the face image, can judge whether to supplement the light based on the ambient light intensity, can improve the clarity of the collected image, and can also be based on the detected person and the portrait camera. Capturing the face of the person being detected can avoid the invalid operation of the portrait lens, improve the effectiveness of the target face image acquisition through the portrait camera, and save power consumption of the device.

Optionally, for step S11, the embodiment of the present application provides an implementation method for determining the iris-pupil diameter ratio, please refer to FIG. 4, which is a schematic diagram of the steps for determining the iris-pupil diameter ratio provided by the embodiment of the present application. The diameter ratio steps may include:

In step S41, acquire the face image of the detected person based on the face camera, locate the human eye position, determine the first difference between the human eye position and the standard human eye position, and according to the first difference Control the iris camera to rotate the first angle.

In step S42, locate the iris position based on the iris image collected by the iris camera, determine the second difference between the iris position and the standard iris position, and control the iris camera to rotate by a second angle according to the second difference .

In step S43, the primary screening iris image is collected based on the rotated iris camera, and the iris-to-pupil diameter ratio in the primary screening iris image is determined.

It can be seen that the embodiment of the present application assists in positioning the iris by collecting face images, thereby being able to adapt to the height of the person being detected, and adjust the angles of the face camera and the iris camera based on the face image data and the iris data collected for the first time , can ensure that the iris image of the detected person is collected, and improve the detection efficiency. And through the adjustment of the face camera and the iris camera, the accuracy of the collected iris image can also be improved.

In an optional embodiment, the embodiment of the present application also provides an implementation method of judging whether to perform detection based on the emotion of the person being tested. Please refer to FIG. Schematic diagram of the steps for determining whether to detect emotions, and the steps of this implementation method may include:

In step S51, the emotion analysis is performed on the faces in the face image to obtain the emotion analysis result.

In step S52, when the emotional analysis result shows that the detected person is emotionally excited, a prompt message is sent to calm the detected person.

In step S53, when the emotional analysis result shows that the detected person's emotion is in a stable state, it is determined to collect the primary screening iris image of the detected person.

Exemplarily, the prompt information may be a voice prompt, may be a flashing breathing light, or may be a soft picture displayed on a display screen. When the emotional analysis results show that the subject is emotionally excited, the breathing light can be used to guide the subject to calm down, display a calming animation on the display screen, or play soothing music to assist the target person to return to a stable state.

As an optional implementation, the emotional state of the target person can also be judged through heart rate monitoring, for example, the heart rate data of the target person can be automatically uploaded through devices such as a heart rate bracelet. When the heart rate data of the target person is outside the normal heart rate range, it is determined that the target person is emotionally excited. When the heart rate data of the target person is within the normal heart rate range, it is determined that the detected person's emotion is in a stable state.

It can be seen that the embodiment of the present application performs emotional analysis on the face image of the subject to avoid the interference of pupil and iris changes on the iris-to-pupil diameter ratio caused by the subject's emotional fluctuations, and can improve the accuracy of drug abuse detection. sex.

Optionally, before step S11, the embodiment of the present application also provides an age-based drug use identification method, please refer to FIG. 6, which is a schematic diagram of the steps of an age-based drug use identification method provided by the embodiment of the present application. Steps in age-based drug use discrimination can include:

In step S61, image detection is performed on the face image and the ID card database to determine the age of the detected person.

In step S62, an age-standard iris-to-pupil diameter ratio range corresponding to the age of the detected person is obtained.

In step S63, when the iris-to-pupil diameter ratio is outside the age-standard iris-to-pupil diameter ratio range, it is determined that the detected person is a suspected drug addict.

For example, the age of the subject can be divided into juvenile (for example, less than 18 years old), youth (for example, 19 to 40 years old), middle-aged (for example, 41 to 60 years old) and old age (for example, greater than 60 years old), each age Each segment has a corresponding standard rate of change of pupil diameter. When the detected person is a young person, the change rate of the pupil diameter in a series of iris images collected is compared with the pupil diameter change rate of the young person, and it is judged whether the detected person takes drugs according to the comparison result.

It can be seen that in the embodiment of the present application, according to the age of the detected person, the pupil diameter change rate in the collected iris image is compared with the pupil diameter change rate of the corresponding age group, which can eliminate the influence of age on the drug use detection results, thereby improving Accuracy of drug detection.

It should be understood that although the steps in the flow charts involved in the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least some of the steps in the flow charts involved in the above-mentioned embodiments may include multiple steps or stages, and these steps or stages are not necessarily executed at the same time, but may be performed at different times For execution, the execution order of these steps or stages is not necessarily performed sequentially, but may be executed in turn or alternately with other steps or at least a part of steps or stages in other steps.

Specifically, the above-mentioned implementation method can be applied to a drug use detection device 70, please refer to FIG. 7, which is a schematic diagram of a drug use detection device provided in an embodiment of the present application. , a rotating shaft (not shown in the figure) and a supplementary light, the face camera 71 and the iris camera 72 are all arranged on the rotating shaft, the rotating shaft can be driven by a motor, and the face camera can be driven based on the control instructions of the terminal or processor 71 and iris camera 72 rotate. The face camera 71 is used for collecting face images, and the iris camera 72 is used for collecting iris images.

The drug use detection device 70 also includes a processor (not shown in the figure) and a memory (not shown in the figure), and computer program instructions are stored in the memory, and when the computer program instructions are executed by the processor, any of the above-mentioned Steps in the drug use detection method.

In one embodiment, the supplementary light of the drug abuse detection device 70 includes a first supplementary light 73 and a second supplementary light 74 . The first supplementary light 73 can be arranged on the left and right sides of the iris camera 72, and there is a preset angle between the beam center of the first supplementary light 73 and the imaging center of the iris camera 72, and the first supplementary light can 73 supplements light to the iris camera 72, and the value of the preset included angle is related to the direction of the light beam and the position of the iris camera 71, and can be set according to the actual situation. In one embodiment, when the computer program instructions are executed by the processor, the following steps are implemented:

Detect the ambient light intensity before the collection of the primary screening iris image of the subject, and control the first supplementary light 72 to perform supplementary light based on the ambient light intensity, so as to obtain the primary screening iris image;

determining the iris-to-pupil diameter ratio of the subject based on the primary screening iris image;

The second supplementary light 74 can be arranged around the casing of the drug abuse detection device 70 . When the computer program instructions are executed by the processor, the processor controls the second supplementary light 74 to blink for a period of time, during which the drug abuse detection device 70 collects multiple iris images of the subject, and then extracts multiple iris images The iris image and the pupil diameter in the iris image determine whether the detected person is taking drugs according to the change rate of the pupil diameter in the multiple iris images relative to time.

When detecting whether a person is a drug addict, by executing the computer program instructions, the processor can first collect the face image of the person being detected through the face camera 71, locate the human eye coordinates through the human face image, and set the human eye coordinates After comparing with the human eye reference coordinates, determine the first difference between the human eye coordinates and the standard human eye coordinates, and generate a first rotation command according to the first difference and send it to the motor, and the motor receives the first rotation When commanded, the rotating shaft is driven to rotate by a first rotation angle to drive the face camera 71 and iris camera 72 to rotate by the first angle. After the first rotation angle of the motor is completed, the processor also collects the iris image through the iris camera 72, locates the iris position of the detected person, determines the second difference between the iris coordinates and the iris reference coordinates, and according to The second difference generates a second rotation command and sends it to the motor, and the motor rotates the second rotation angle when receiving the second rotation command, so that the face camera 71 and the iris camera 72 are at the maximum position of image acquisition after the rotation is completed. optimal position and capture iris images.

Exemplarily, the face camera 71 and the iris camera 72 are arranged on the same horizontal line of the rotation axis, and the horizontal distance between the two is about 40mm. °), the vertical field of view of the iris camera is relatively small (usually 30°), and the position of the human eye may fall within the field of view of the face camera, but not within the field of view of the iris camera. The face camera 71 and the iris camera 72 are driven to rotate through the rotating shaft, so that the face camera 71 or the iris camera 72 is located at the best position for image acquisition.

It can be understood that when the subject's line of sight is directly facing the iris camera 72, the iris camera 72 is at an optimal angle for photographing the iris of the subject. When carrying out iris photography, because the height of the human eye is relatively different from the height of the iris camera 72, the angle between the people's line of sight and the iris camera 72 is different, so the quality of the iris image is different, you can adjust the angle of the iris camera 72, position to suit different subjects. The difference between the height of the human eye and the height of the iris camera 72 can be represented by human eye coordinates and iris coordinates. The standard human eye coordinates and standard iris coordinates are the human eye coordinates and iris coordinates when the iris camera 72 is at the best angle to capture the subject's iris.

A display screen 75 can also be arranged on the drug abuse detection device 70, and the second supplementary light 74 can be a light of a face camera, or a white supplementary light provided separately. When the second supplementary light 74 is a white supplementary light provided separately, it can be arranged on one or more sides around the casing of the drug abuse detection device 70, or it can be arranged in the middle position above the casing of the drug abuse detection device 70 or at Near the iris camera 72.

When the processor executes the computer program instructions, it also implements the following steps: when it is determined that the emotion analysis result is that the detected person’s emotion is in an excited state, the second supplementary light 74 can be controlled to flash at a fixed frequency To guide the subject to calm down, a preset picture can also be played on the display screen 75, such as animations such as the blue sea that help calm the mood and guide the subject to calm down.

In an optional embodiment, when detecting the age of a person's face, a deep learning method can be used for face detection, or an ID card identification module can be set on the drug abuse detection device 70, and the year of birth on the ID card of the person to be detected can be used. Monthly to determine the age of the person being tested.

Based on the same inventive concept, the embodiment of the present application also provides a drug use detection device 80, please refer to FIG. 8, which is a schematic diagram of a drug use detection device provided in the embodiment of the present application. The drug use detection device 80 may include:

The primary screening module 81 is configured to collect the primary screening iris image of the subject, determine the iris-pupil diameter ratio in the primary screening iris image, and determine whether the subject is a drug suspect based on the iris-pupil diameter ratio, The iris-to-pupil diameter ratio is the ratio of the detected person's iris diameter to the pupil diameter.

The fine screening module 82 is used to acquire a plurality of fine screening iris images of the detected person within the flashing time period of the supplementary light when the detected person is a suspected drug addict, based on a plurality of the fine screening iris images The image determines the iris-pupil diameter ratio change rate of the detected person; based on the iris-pupil diameter ratio change rate, it is determined whether the detected person is a drug addict.

Optionally, the drug abuse detection device 80 may also include:

The primary screening module 81 can be used to control the supplementary light to perform supplementary light based on the ambient light intensity, so as to obtain the primary screening iris image; determine the iris-pupil diameter ratio of the subject based on the primary screening iris image; and When the iris-to-pupil diameter ratio is outside the range of the standard iris-to-pupil diameter ratio under the same light intensity, it is determined that the detected person is a drug suspect.

Optionally, the light control module can be used to detect the distance between the detected person and the portrait camera; when the distance is less than a preset distance, the face area of the detected person is photographed based on the portrait camera to obtain A face image; performing light intensity analysis on the face image to obtain the ambient light intensity.

Optionally, the preliminary screening module 81 can be used to obtain the detected person's face image based on the face camera, locate the position of the human eye, determine the first difference between the position of the human eye and the standard human eye position, and The first difference controls the iris camera to rotate the first angle; locates the iris position based on the iris image collected by the iris camera, determines the second difference between the iris position and the standard iris position, and controls the iris according to the second difference The iris camera rotates by a second angle; and based on the iris camera capturing the primary screening iris image after rotation, determining the iris-to-pupil diameter ratio in the primary screening iris image.

Optionally, the drug use detection device 80 may also include an emotion detection module, which is used to perform emotion analysis on the face in the face image to obtain an emotion analysis result; when the emotion analysis result shows that the detected person's emotion is excited state, send a reminder message to calm down the subject; and when the emotional analysis result shows that the subject’s emotion is in a stable state, determine to collect the primary screening iris image of the subject .

Optionally, the drug use detection device 80 may also include an age detection module, which is used to perform image detection on the face image and the ID card library to determine the age of the detected person; and obtain the age corresponding to the detected person's age. Age-standard iris-to-pupil diameter ratio range.

The primary screening module 81 can be used to determine that the subject is a drug suspect when the iris-to-pupil diameter ratio is outside the age-standard iris-to-pupil diameter ratio range.

Each module in the above-mentioned drug abuse detection device can be fully or partially realized by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, and can also be stored in the memory of the computer device in the form of software, so that the processor can invoke and execute the corresponding operations of the above-mentioned modules.

Based on the same inventive concept, an embodiment of the present application also provides a computer-readable storage medium, wherein computer program instructions are stored in the computer-readable storage medium, and when the computer program instructions are read and executed by a processor, the above-mentioned A step in any implementation.

The computer-readable storage medium can be random access memory (Random Access Memory, RAM), read-only memory (Read Only Memory, ROM), programmable read-only memory (Programmable Read-Only Memory, PROM), erasable Various media that can store program codes such as Erasable Programmable Read-Only Memory (EPROM), Electric Erasable Programmable Read-Only Memory (EEPROM), etc. Wherein, the storage medium is used to store the program, and the processor executes the program after receiving the execution instruction, and the method performed by the electronic terminal according to the process definition disclosed in any embodiment of the present invention can be applied to the processor , or implemented by the processor.

In the embodiments provided in this application, it should be understood that the disclosed devices and methods may be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some communication interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

In addition, the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Furthermore, each functional module in each embodiment of the present application may be integrated to form an independent part, each module may exist independently, or two or more modules may be integrated to form an independent part.

Alternatively, it may be realized in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, all or part of the processes or functions according to the embodiments of the present invention will be generated.

The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center Transmission to another website site, computer, server, or data center by wired (eg, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.).

In this document, relational terms such as first and second etc. are used only to distinguish one entity or operation from another without necessarily requiring or implying any such relationship between these entities or operations. Actual relationship or sequence. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the statement "comprising..." does not exclude the presence of additional same elements in the process, method, article or device comprising said element.

The above descriptions are only examples of the present application, and are not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and changes may be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims

A drug detection method, said method comprising:

Collect the primary screening iris image of the tested person;

Determining the iris-pupil diameter ratio in the primary screening iris image, the iris-pupil diameter ratio being the ratio of the detected person's iris diameter to the pupil diameter;

determining whether the detected person is a drug suspect based on the iris-to-pupil diameter ratio;

When the subject is a drug suspect, acquiring a plurality of fine-screened iris images of the subject during the flashing time period of the supplementary light;

determining the rate of change of the iris-pupil diameter ratio of the subject based on a plurality of finely screened iris images; and

It is determined whether the detected person is a drug addict based on the change rate of the iris-to-pupil diameter ratio.
The method according to claim 1, wherein, before the first screening iris image of the collected subject, the method further comprises:

Detect ambient light intensity;

The collecting the primary screening iris image of the subject, determining the iris-pupil diameter ratio in the primary screening iris image, and determining whether the subject is a drug suspect based on the iris-pupil diameter ratio include:

Based on the ambient light intensity, the supplementary light is controlled to perform supplementary light, so as to obtain the primary screening iris image;

determining the iris-to-pupil diameter ratio of the subject based on the primary screening iris image; and

When the iris-to-pupil diameter ratio is outside the standard iris-to-pupil diameter ratio range under the same light intensity, it is determined that the detected person is a suspected drug addict.
The method according to claim 2, wherein said detecting ambient light intensity comprises:

Detect the distance between the detected person and the portrait camera;

When the distance is less than a preset distance, based on the portrait camera, the detected person's face area is photographed to obtain a face image; and

Light intensity analysis is performed on the face image to obtain the ambient light intensity.
The method according to claim 2 or 3, wherein the flickering light intensity of the fill light is higher than the ambient light intensity.
The method according to claim 1, wherein said collecting the primary screening iris image of the subject and determining the iris-pupil diameter ratio in the primary screening iris image include:

Obtaining the face image of the detected person based on the face camera;

Locating the position of the human eye, and determining the first difference between the position of the human eye and the position of the standard human eye;

Control the iris camera to rotate a first angle according to the first difference;

Positioning the iris position based on the iris image collected by the iris camera;

determining a second difference between the iris position and a standard iris position;

controlling the iris camera to rotate a second angle according to the second difference; and

The primary screening iris image is collected based on the rotated iris camera, and the iris-to-pupil diameter ratio in the primary screening iris image is determined.
The method according to claim 1, wherein, before the first screening iris image of the collected subject, the method further comprises:

Carry out emotion analysis on the face in the face image, and obtain the emotion analysis result;

When the emotional analysis result shows that the detected person is emotionally excited, sending a prompt message to calm the detected person; and

When the emotional analysis result shows that the detected person's emotion is in a stable state, it is determined to collect the primary screening iris image of the detected person.
The method according to claim 1, wherein, before determining whether the detected person is a drug suspect based on the iris-to-pupil diameter ratio, the method further comprises:

Performing image detection on the face image and the ID card database to determine the age of the detected person; and

Obtaining an age-standard iris-to-pupil diameter ratio range corresponding to the age of the detected person;

The determining whether the detected person is a drug suspect based on the iris-to-pupil diameter ratio includes: when the iris-to-pupil diameter ratio is outside the age-standard iris-to-pupil diameter ratio range, determining that the detected person is drug suspect.
A drug detection device, said device comprising:

The primary screening module is used to collect the primary screening iris image of the detected person, determine the iris-pupil diameter ratio in the primary screening iris image, and determine whether the detected person is a drug suspect based on the iris-pupil diameter ratio. The iris-to-pupil diameter ratio is the ratio of the detected person's iris diameter to the pupil diameter; and

The fine screening module is used to acquire a plurality of fine screening iris images of the detected person during the flashing time period of the supplementary light when the detected person is a drug suspect, based on a plurality of the fine screening iris images Determining the change rate of the iris-to-pupil diameter ratio of the detected person; determining whether the detected person is a drug addict based on the change rate of the iris-to-pupil diameter ratio.
A drug detection device comprising:

Face camera for collecting face images;

Iris camera for collecting iris images;

The supplementary light is set outside the drug detection equipment or around the iris camera;

a memory storing computer program instructions; and

A processor, when the processor executes the computer program instructions, the following steps are performed:

Collecting the primary screening iris image of the detected person through the iris camera;

Determine the iris-pupil diameter ratio in the first screening iris image, the iris-pupil diameter ratio is the ratio of the detected person's iris diameter and pupil diameter;

determining whether the detected person is a drug suspect based on the iris-to-pupil diameter ratio;

When the subject is a drug suspect, acquiring a plurality of fine-screened iris images of the subject during the flashing time period of the supplementary light;

determining the rate of change of the iris-pupil diameter ratio of the subject based on a plurality of finely screened iris images; and

It is determined whether the detected person is a drug addict based on the change rate of the iris-to-pupil diameter ratio.
The drug abuse detection device according to claim 9, wherein, when the processor executes the computer program instructions, before the acquisition of the primary screening iris image of the subject, the following steps are also performed:

Detect ambient light intensity;

The collecting the primary screening iris image of the subject, determining the iris-pupil diameter ratio in the primary screening iris image, and determining whether the subject is a drug suspect based on the iris-pupil diameter ratio include:

controlling the supplementary light to perform supplementary light based on the ambient light intensity, so as to obtain the primary screening iris image;

determining the iris-to-pupil diameter ratio of the subject based on the primary screening iris image; and

When the iris-to-pupil diameter ratio is outside the standard iris-to-pupil diameter ratio range under the same light intensity, it is determined that the detected person is a suspected drug addict.
The drug abuse detection device according to claim 9, wherein the face camera and the iris camera can rotate under the drive of a rotating shaft, and the collection of the primary screening iris image of the detected person determines the primary screening iris image. Iris-to-pupil diameter ratios in iris images include:

Obtaining the face image of the detected person based on the face camera;

Locating the position of the human eye, and determining the first difference between the position of the human eye and the position of the standard human eye;

controlling the iris camera to rotate by a first angle according to the first difference;

Positioning the iris position based on the iris image collected by the iris camera;

determining a second difference between the iris position and a standard iris position;

controlling the iris camera to rotate a second angle according to the second difference; and

The primary screening iris image is collected based on the rotated iris camera, and the iris-to-pupil diameter ratio in the primary screening iris image is determined.
The drug abuse detection device according to claim 9, wherein, when the processor executes the computer program instructions, before the acquisition of the primary screening iris image of the subject, the following steps are also performed:

Carry out emotion analysis on the face in the face image, and obtain the emotion analysis result;

When the emotional analysis result shows that the detected person is emotionally excited, sending a prompt message to calm the detected person; and

When the emotional analysis result shows that the detected person's emotion is in a stable state, it is determined to collect the primary screening iris image of the detected person.
The drug use detection device according to claim 12, wherein the drug use detection device further includes a display screen, and the prompt information is a preset picture played through the display screen or the supplementary light flashes at a fixed frequency .
The drug use detection device according to claim 9, wherein, when the processor executes the computer program instructions, before determining whether the detected person is a drug use suspect based on the iris-to-pupil diameter ratio, the The processor also performs the following steps:

Performing image detection on the face image and the ID card database to determine the age of the detected person; and

Obtaining an age-standard iris-to-pupil diameter ratio range corresponding to the age of the detected person;

The determining whether the detected person is a drug suspect based on the iris-to-pupil diameter ratio includes: when the iris-to-pupil diameter ratio is outside the age-standard iris-to-pupil diameter ratio range, determining that the detected person is drug suspect.
A computer-readable storage medium, wherein computer program instructions are stored in the computer-readable storage medium, and when the computer program instructions are executed by a processor, the steps in the method of any one of claims 1-7 are performed.