WO2019223002A1

WO2019223002A1 - Structure light detection device and detection method, identity recognition device and electronic device

Info

Publication number: WO2019223002A1
Application number: PCT/CN2018/088473
Authority: WO
Inventors: 田浦延
Original assignee: 深圳阜时科技有限公司
Priority date: 2018-05-25
Filing date: 2018-05-25
Publication date: 2019-11-28
Also published as: CN108700917B; CN108700917A

Abstract

The present application is applicable to the field of optical and electronic technologies, and provides a structure light detection device for detecting whether a diffractive optical element in a light source module is damaged or detached, so as to avoid the presence of unsafe zero-order diffracted light in the structure light generated by the light source module, or to prevent the light emitted by the light source of the light source module from being directly emitted without being modulated by the diffractive optical element. The structure light detection device comprises a sensing module and an image analysis module. The sensing module acquires light beams reflected after the structure light emitted by the light source module is projected onto a target object, so as to obtain at least one structure light image. The image analysis module analyzes the brightness of different regions in the at least one structure light image to determine whether the diffractive optical element is damaged or detached. The present application further provides a structure light detection method, an identity recognition device and an electronic device. The present application can effectively detect whether there is unsafe zero-order diffracted light in the structure light, and whether direct irradiation of the light source occurs.

Description

Structured light detection device and detection method, identity recognition device and electronic equipment

Technical field

The present application belongs to the field of optical and electronic technologies, and in particular, relates to a structured light detection device and detection method, an identification device and electronic equipment.

Background technique

With the vigorous development of optical technology, the application of structured light (structure light) is becoming more and more widespread, such as face recognition, projectors, 3D contour reconstruction, distance measurement, anti-counterfeit identification, etc. The current light source module for emitting structured light includes a light source and a diffractive optical element (Diffractive Optical Element, DOE). The diffractive optical element is used for modulating the light beam emitted by the light source to form a patterned structured light.

The current light source module is generally designed with DOE during the production and development stage to minimize unsafe light (such as zero-order diffracted light) in structured light. However, in actual use, there are many factors that can cause unsafe light in structured light. When the DOE is detached from the light source module or the DOE is damaged (such as the microstructure of the DOE is changed due to high temperature, the DOE is damaged or broken, and dust particles enter, etc.), some of the light emitted by the light source will not be diffracted by the DOE. Directly emitted, producing zero-order diffracted light. When the intensity of the zero-order diffracted light is too large and exceeds the safety standard, it will cause damage to the user's eyes. When the DOE falls off as a whole, the light emitted by the light source will be directly emitted without passing through the DOE, thereby seriously endangering the safety of the user.

Summary of the Invention

The technical problem to be solved by the present application is to provide a structured light detection device and a detection method, which are able to effectively detect whether there is unsafe zero-order diffracted light in the structured light generated by the light source module, and whether the light from the light source does not undergo diffraction. The optical element emits directly.

This application is implemented as such, a structured light detection device for detecting whether a diffractive optical element in a light source module is damaged or detached, so as to prevent light emitted by a light source in the light source module from passing through the diffractive optical element There is unsafe zero-order diffracted light in the emitted structured light, or the light emitted by the light source in the light source module is not directly emitted through the diffractive optical element. The structured light detection device includes a sensing module and an image analysis module. The sensing module is used to obtain the reflected light beam of the structured light emitted by the light source module after being projected on a target to obtain at least one structured light image. The image analysis module is used to analyze the brightness of different regions in the at least one structured light image, so as to determine whether the diffractive optical element is damaged or detached.

The present application also provides a structured light detection method for detecting whether a diffractive optical element in a light source module is damaged or detached, so as to prevent light emitted by a light source in the light source module from passing through the diffractive optical element. There are unsafe zero-order diffracted rays in the structured light, or the light emitted by the light source in the light source module does not directly exit through the diffractive optical element; it includes the following steps:

Obtaining the reflected light beam of the structured light emitted by the light source module after being projected onto a target to obtain at least one structured light image; and

The brightness of different regions in the at least one structured light image is analyzed to determine whether the diffractive optical element is damaged or detached.

The present application also provides an identity recognition device, which includes a light source module, a mode selection module, and the structured light detection device described above. The mode selection module is used to select a detection mode or a working mode according to user needs. When the detection mode is selected, the structured light detection device detects whether the diffractive optical element in the light source module is damaged or detached, so as to prevent the light emitted by the light source in the light source module from passing through the diffractive optical element into the structured light. There is unsafe zero-order diffracted light, or the light emitted by the light source in the light source module is not directly emitted through the diffractive optical element; when the working mode is selected, the identification module performs identity recognition.

The present application also provides an electronic device including the above-mentioned identity recognition device. The electronic device is configured to correspond to whether to execute a corresponding function according to a recognition result of the identity recognition device.

Compared with the prior art, the present application has the beneficial effects that it can effectively detect whether there is unsafe zero-order diffracted light in the structured light generated by the light source module, and whether the light from the light source is directly emitted without passing through the diffractive optical element to prevent unsafety The light directly hits the eyes, which effectively protects the user's safety.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a functional block diagram of a structured light detection device according to a first embodiment of the present application.

FIG. 2 is a functional block diagram of a structured light detection device according to a second embodiment of the present application.

3 and 4 are flowcharts of a structured light detection method according to a third embodiment of the present application.

FIG. 4 is a partial flowchart of a structured light detection method according to a third embodiment of the present application.

FIG. 5 is a functional module diagram of an identity recognition device provided by a fourth embodiment of the present application.

FIG. 6 is a schematic structural diagram of an electronic device according to a fifth embodiment of the present application.

Detailed ways

In order to make the purpose, technical solution, and advantages of the present application clearer, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application, and are not used to limit the application.

The following disclosure provides many different implementations or examples for implementing different structures of the present application. To simplify the disclosure of this application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the application. Furthermore, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the sake of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

Further, the described features and structures may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to give a full understanding of the embodiments of the present application. However, those skilled in the art should realize that the technical solution of the present application can also be practiced without one or more of the specific details, or with other structures, components, and the like. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the application.

As shown in FIG. 1, a structured light detection device 100 provided in the first embodiment of the present application is used to detect whether a diffractive optical element in a light source module is damaged or detached, so as to avoid emission by a light source in the light source module. There is unsafe zero-order diffracted light in the structured light emitted by the light passing through the diffractive optical element, or the light emitted by the light source in the light source module is not directly emitted through the diffractive optical element. The light source module is, for example, but not limited to, a semiconductor edge-emitting laser (Edge Emitting Laser), a vertical cavity surface emitting laser (Vertical Cavity Surface Emitting Laser, VCSEL), or other suitable types of light source devices. In some embodiments, the light source module includes, for example, a plurality of light sources, and the light source is, for example, but not limited to, a point light source. Light emitted by the plurality of point light sources in the light source module forms a surface light source at a predetermined distance.

The structured light detection device 100 includes a sensing module 10, an image analysis module 20, and a warning module 30.

The sensing module 10 is configured to obtain the reflected light beams of the structured light emitted by the light source module after being projected onto a target, so as to obtain at least one structured light image.

The image analysis module 20 is configured to analyze the brightness of different regions in the at least one structured light image to determine whether the diffractive optical element is damaged or detached.

In this embodiment, the different regions are regions where a light spot is located in the structured light image.

A brightness threshold is stored in the image analysis module 20. The safe brightness threshold is obtained by analyzing the brightness value of the structured light image corresponding to different driving current values from small to large. The minimum value of the driving current is zero, and the maximum value is the maximum operating current of the light source. The driving current value is changed from small to large in a small step size.

The image analysis module 20 is configured to calculate the number of light spots in the structured light image. If the number of light spots in the structured light image is only one, and the brightness of the area where the only light spot is located is greater than the safe brightness threshold, it is determined that the diffractive optical element is entirely off, resulting in that the light emitted by the light source in the light source module has not been diffracted The optical element is directly emitted; if the number of light spots in the structured light image is greater than one, and the brightness of at least one light spot is greater than the safe brightness threshold, it is determined that the diffractive optical element is damaged or partially detached, resulting in There is zero-order diffracted light in the structured light or light emitted by a part of the light sources in the light source module is directly emitted without being modulated by a diffractive optical element.

In other embodiments, the image analysis module 20 may also compare the brightness of each pixel of at least one region in the at least one structured light image with the safe brightness threshold. If it is larger than the safe brightness threshold, it is determined that the diffractive optical element is broken or detached.

The warning module 30 is used to control the corresponding light source in the light source module to stop working or control the light source module to stop working or issue an alarm signal or output when the image analysis module 20 determines that the diffractive optical element in the light source module is damaged or falls off. Test results.

As shown in FIG. 2, a structured light detection device 200 according to a second embodiment of the present application includes a sensing module 210 and an image analysis module 220. The main difference between the structured light detection device 200 and the structured light detection device 100 of the first embodiment is that the structured light detection device 200 further includes a control module 240. The control module 240 is configured to control a driving current of a light source in the light source module (not shown), so as to control a light intensity of the light source. The minimum value of the driving current is zero, and the maximum value is the maximum operating current of the light source; the driving current value is changed from small to large in a small step.

Because the time interval between two consecutive frames of structured light images is short, it can be considered that the shooting environment has almost no change. The image analysis module 220 is used to analyze the brightness of different regions in the structured light images corresponding to different driving currents to determine the diffraction. Whether the optical element is damaged or detached.

Specifically, the image analysis module 220 determines whether the brightness change range of the structured light image matches the change range of the driving current to determine whether the diffractive optical element is damaged or detached. If they do not match, it is determined that the diffractive optical element is broken or detached. If they match, it is determined that the diffractive optical element is not broken or detached.

In another embodiment, the image analysis module 220 may also determine whether the diffractive optical element is damaged or detached by analyzing the brightness change between the structured light images obtained two or more times next to each other. For example, when the driving current of the light source is zero, the light source module does not emit structured light. At this time, the brightness of any pixel in the structured light image is Pref (x, y); when the driving current of the light source increases, When a predetermined current value is reached, the light source module emits structured light. At this time, the brightness of any pixel in the structured light image is Pget (x, y). If Pget (x, y) ≥Pref (x, y) + Thd is satisfied, it is determined that the diffractive optical element is broken or detached. Wherein, Thd is a brightness change threshold, which corresponds to the predetermined current value.

Further, the control module 240 controls the driving current of the light source in the light source module to be changed from small to large, so as to prevent the light intensity of the structured light generated by the light source module from being too large and causing damage to the eyes of the user.

Further, after the image analysis module 220 analyzes the structured light image obtained by the current driving current, the control module 240 increases the driving current, and the image analysis module 220 analyzes the structured light image corresponding to the increased driving current. Perform analysis.

As shown in FIG. 3, a third embodiment of the present application provides a structured light detection method for detecting whether a diffractive optical element in a light source module is damaged or detached, so as to prevent light emitted by the light source in the light source module from passing through. There is unsafe zero-order diffracted light in the structured light emitted after the diffractive optical element, or the light emitted by the light source in the light source module is not directly emitted through the diffractive optical element, which includes the following steps:

S1: Obtaining the reflected light beam of the structured light emitted by the light source module after it is projected on a target to obtain at least one structured light image.

S2: Analyze the brightness of different regions in the at least one structured light image to determine whether the diffractive optical element is damaged or detached.

S3: If it is (that is, the diffractive optical element is broken or detached), control the light source or the light source module or the electronic device where the light source module is located to stop working or issue an alarm signal (such as a buzzer or a warning light or a display screen displays a warning Information) or output the test results.

S4: If not (that is, the diffractive optical element is not damaged or detached), the detection is ended and the detection result is output.

Specifically, in this embodiment, the different regions are regions where a light spot in the structured light image is located. As shown in FIG. 4, step S2 includes the following steps:

S21: Determine whether the number of light spots in the structured light image is only one.

S22: If there is only one, determine whether the brightness of the area where the unique light spot is located is greater than a safe brightness threshold. The safe brightness threshold is obtained by analyzing the brightness value of the structured light image corresponding to different driving current values from small to large; the minimum value of the driving current is zero, and the maximum value is the maximum operating current of the light source; the driving The current value changes in small steps from small to large.

S23: If yes (that is, the brightness of the area where the light spot is located is greater than the safe brightness threshold), it is determined that the diffractive optical element is entirely off, resulting in that the light emitted by the light source in the light source module is not directly emitted through the diffractive optical element; go to step S3 .

S24: If not (that is, the brightness of the area where the light spot is located is less than or equal to the safe brightness threshold), it is determined that the diffractive optical element has not been damaged or detached, and the process proceeds to step S4.

S25: If the number of light spots in the structured light image is greater than one, it is determined that the brightness of the area where at least one light spot is located is greater than the safe brightness threshold.

S26: If yes (that is, the brightness of the area where at least one spot is greater than the safe brightness threshold), it is determined that the diffractive optical element is damaged or partially detached, resulting in zero-order diffracted light in the structured light generated by the light source module; go to step S3.

S27: If not (that is, the brightness of the area where at least one spot is less than or equal to the safe brightness threshold), it is determined that the diffractive optical element is not damaged or detached, and the process proceeds to step S4.

In other embodiments, step S2 may also include the following steps: controlling the driving current of the light source in the light source module to control the light emitting intensity of the light source; and analyzing the brightness of different regions in the structured light image corresponding to different driving currents To determine whether the diffractive optical element is broken or detached.

The minimum value of the driving current is zero, and the maximum value is the maximum operating current of the light source; the driving current value is changed from small to large in a small step.

Specifically, since the time interval between two consecutive frames of structured light images is short, it can be considered that there is almost no change in the shooting environment. Therefore, this step "analyzes the brightness of different regions in the structured light images corresponding to different driving currents to determine the Whether the diffractive optical element is broken or falling off "includes the following steps: judging whether the diffractive optical element is broken or falling off by judging whether the brightness change amplitude of the structured light image matches the change amplitude of the driving current. If they do not match, it is determined that the diffractive optical element is broken or detached. If they match, it is determined that the diffractive optical element is not broken or detached.

In another embodiment, the step of “analyzing the brightness of different regions in the structured light image corresponding to different driving currents to determine whether the diffractive optical element is damaged or peeled off” includes the following steps: by analyzing two or more adjacent The brightness change between the structured light images obtained twice, to determine whether the diffractive optical element is damaged or detached. For example, when the driving current of the light source is zero, the light source module does not emit structured light. At this time, the brightness of any pixel in the structured light image is Pref (x, y); when the driving current of the light source increases, When a predetermined current value is reached, the light source module emits structured light. At this time, the brightness of any pixel in the structured light image is Pget (x, y). If Pget (x, y) ≥Pref (x, y) + Thd is satisfied, it is determined that the diffractive optical element is broken or detached. Wherein, Thd is a brightness change threshold, which corresponds to the predetermined current value.

Further, in order to prevent the intensity of the light emitted by the light source module from being too great to harm the eyes of the user, the driving current of the light source in the light source module is controlled to be changed from small to large.

Further, after the structured light image corresponding to the current driving current is analyzed, the control module increases the driving current and analyzes the structured light image corresponding to the increased driving current.

As shown in FIG. 5, an identity recognition device 300 provided by a fourth embodiment of the present application includes a mode selection module 310, a light source module 320, an identification module 330, and the structured light detection device of the above-mentioned first or second embodiment. 100 (200).

The mode selection module 310 is configured to select a “working mode” or a “detection mode” according to user requirements.

When the “working mode” is selected, the identification module 330 is configured to perform identity identification. Specifically, the light source module 320 is configured to emit structured light and project the structured light onto an object to be measured. The sensing module in the structured light detection device 100 (200) is configured to acquire an image of structured light reflected by the object to be measured. The recognition module 330 is configured to perform identity recognition according to an image acquired by the sensing module.

Of course, in other embodiments, the identity recognition device 300 further includes a sensing module for specialized identity recognition. The sensing module for identification is used to obtain an image of structured light reflected by the object to be measured during the identification process. The sensing module in the structured light detection device 100 (200) is configured to obtain an image of structured light reflected by the object to be measured during the structured light detection process.

When the “detection mode” is selected, the structured light detection device 100 (200) detects whether a diffractive optical element in a light source module is damaged or detached, so as to prevent light emitted by a light source in the light source module from passing through the diffractive optical element There is unsafe zero-order diffracted light in the emitted structured light, or the light emitted by the light source in the light source module is not directly emitted through the diffractive optical element.

The structured light detection device 100 (200) is also used to control the light source or the light source module 320 or the identification device 300 to stop working or issue an alarm signal or output when it is determined that the diffractive optical element in the light source module is damaged or detached. Test results.

The identity recognition device 300 is, for example, a face recognition device. However, the identification device 300 can also be used for identifying other suitable parts of the human body, and even for identifying other living or non-living bodies.

As shown in FIG. 6, an electronic device 400 provided by a fifth embodiment of the present application is, for example, but not limited to, suitable types of electronics such as consumer electronics, home electronics, vehicle-mounted electronics, and financial terminal products. product. Among them, consumer electronic products include, but are not limited to, mobile phones, tablet computers, notebook computers, desktop displays, and computer all-in-one computers. Household electronic products include, but are not limited to, smart door locks, televisions, refrigerators, wearable devices, and the like. The vehicle-mounted electronic products are, for example, but not limited to, a car navigation system, a car DVD, and the like. Financial terminal products are, for example, but not limited to, ATM machines, self-service terminals, and the like.

The electronic device 400 includes the above-mentioned identification device 300. The electronic device 400 corresponds to whether to execute a corresponding function according to the identification result of the identification device 300. The corresponding function includes, for example but not limited to, any one or more of unlocking, paying, and launching a pre-stored application.

In this embodiment, the electronic device 400 is taken as an example for description. The mobile phone is, for example, a full-screen mobile phone, and the identification device 300 is disposed on the front top of the mobile phone, for example. Of course, the phone is not limited to full-screen phones.

For example, when the user needs to unlock the device, raising the mobile phone or touching the screen of the mobile phone can both wake up the identity recognition device 300. When the identification device 300 is awakened and the user in front of the mobile phone is identified as a legitimate user, the screen is unlocked.

Compared with the prior art, the structured light detection device and method, identity recognition device and electronic equipment of the present application can effectively detect whether a zero-order diffracted beam exists in the structured light, thereby effectively protecting the safety of the user.

In the description of this specification, the description with reference to the terms “one embodiment”, “some embodiments”, “exemplary embodiments”, “examples”, “specific examples”, or “some examples” and the like means that in combination with Specific features, structures, materials, or characteristics described in the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same implementation or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more implementations or examples.

The above are only preferred embodiments of this application, and are not intended to limit this application. Any modification, equivalent replacement, and improvement made within the spirit and principle of this application shall be included in the protection of this application. Within range.

Claims

A structured light detection device is used to detect whether a diffractive optical element in a light source module is damaged or detached, so as to avoid the existence of structured light emitted by light emitted by a light source in the light source module after being modulated by the diffractive optical element Unsafe zero-order diffracted light, or light emitted by a light source in the light source module is directly emitted without being modulated by a diffractive optical element; characterized in that the structured light detection device includes a sensing module and an image analysis module. The module is used for obtaining the light beam reflected by the structured light emitted by the light source module after being projected on a target to obtain at least one structured light image; the image analysis module is used to analyze the brightness of different regions in the at least one structured light image In order to determine whether the diffractive optical element is damaged or detached.
The structured light detection device according to claim 1, wherein the different regions are regions where a light spot in the structured light image is located.
The structured light detection device according to claim 2, wherein the image analysis module stores a safe brightness threshold for calculating the number of light spots in the structured light image, and if the number of light spots in the structured light image is only One, and the brightness of the area where the unique light spot is greater than the safe brightness threshold, it is determined that the diffractive optical element as a whole falls off, resulting in that the light emitted by the light source in the light source module is directly emitted without being modulated by the diffractive optical element; if the structured light If the number of light spots in the image is greater than one, and the brightness of the area where at least one light spot is greater than the safe brightness threshold, it is determined that the diffractive optical element is damaged or partially detached, causing an unsafe zero level in the structured light generated by the light source module. The diffracted light or light emitted by a part of the light sources in the light source module is directly emitted without being modulated by a diffractive optical element.
The structured light detection device according to claim 1, wherein the image analysis module stores a safe brightness threshold for brightness of each pixel of at least one area in the at least one structured light image and the safe brightness. The thresholds are compared. If the brightness of a plurality of consecutive pixels is greater than the safe brightness threshold, it is determined that the diffractive optical element is broken or detached.
The structured light detection device according to claim 3 or 4, wherein the safe brightness threshold is obtained by analyzing the brightness value of the structured light image corresponding to different driving current values from small to large; The minimum value is zero, and the maximum value is the maximum operating current of the light source; the driving current value is changed from small to large in a small step.
The structured light detection device according to claim 1, wherein the structured light detection device further comprises a control module for controlling a driving current of a light source in the light source module to control a light intensity of the light source; The image analysis module is used to analyze the brightness of different regions in the structured light image corresponding to different driving currents to determine whether the diffractive optical element is damaged or detached.
The structured light detection device according to claim 6, wherein the image analysis module determines whether the diffractive optical element is damaged by determining whether the brightness change range of the structured light image matches the change range of the driving current. Either it is detached, or the image analysis module determines whether the diffractive optical element is damaged or detached by analyzing the brightness change between the adjacent structured light images obtained two or more times.
The structured light detection device according to claim 6, wherein the control module is configured to control a driving current of a light source in the light source module to change from small to large.
The structured light detection device according to claim 8, wherein after the image analysis module analyzes the structured light image obtained by the current driving current, the control module increases the driving current, and the image analysis module increases the driving current. The structured light image corresponding to the subsequent driving current is analyzed.
The structured light detection device according to claim 1 or 6, wherein the structured light detection device further comprises a warning module for controlling the light source when it is determined that the diffractive optical element in the light source module is damaged or detached. Or the light source module stops working or sends an alarm signal or outputs a detection result.
A structured light detection method for detecting whether a diffractive optical element in a light source module is damaged or detached, so as to avoid the existence of structured light emitted by the light emitted by a light source in the light source module after being modulated by the diffractive optical element. Unsafe zero-order diffracted light, or light emitted by a light source in the light source module is directly emitted without being modulated by a diffractive optical element; it includes the following steps:

Obtaining the reflected light beam of the structured light emitted by the light source module after being projected onto a target to obtain at least one structured light image; and

The brightness of different regions in the at least one structured light image is analyzed to determine whether the diffractive optical element is damaged or detached.
The structured light detection method according to claim 11, wherein the different regions are regions where light spots in the structured light image are located.
The structured light detection method according to claim 12, wherein the step of "analyzing the brightness of the structured light image to determine whether the diffractive optical element is damaged or detached" further comprises: calculating the Quantity, if the number of light spots in the structured light image is only one, and the brightness of the area where the only light spot is located is greater than a safe brightness threshold, it is determined that the diffractive optical element is entirely off, resulting in no light emitted by the light source in the light source module Directly emitted after being modulated by a diffractive optical element; if the number of light spots in the structured light image is greater than one, and the brightness of the area where at least one light spot is greater than the safe brightness threshold, it is determined that the diffractive optical element is damaged or partially detached, causing the light source There is unsafe zero-order diffracted light in the structured light generated by the module or the light emitted by a part of the light sources in the light source module is directly emitted without being modulated by the diffractive optical element.
The structured light detection method according to claim 11, wherein the step of "analyzing the brightness of the structured light image to determine whether the diffractive optical element is damaged or detached" further comprises: adding the at least one structured light image to the structured light image. The brightness of each pixel of at least one area is compared with the safe brightness threshold. If the brightness of a plurality of consecutive pixels is greater than the safe brightness threshold, it is judged that the diffractive optical element is broken or detached.
The structured light detection method according to claim 11 or 12, wherein the safe brightness threshold is obtained by analyzing the brightness value of the structured light image corresponding to different driving current values from small to large; The minimum value is zero, and the maximum value is the maximum operating current of the light source; the driving current value is changed from small to large in a small step.
The structured light detection method according to claim 11, wherein the step "analyzing the brightness of the structured light image to determine whether the diffractive optical element is broken or falling off" further comprises: controlling the light source in the light source module. The driving current is used to control the luminous intensity of the light source; and the brightness of different regions in the structured light image corresponding to different driving currents is analyzed to determine whether the diffractive optical element is damaged or detached.
The structured light detection method according to claim 16, wherein the step "analyzing the brightness of different regions in the structured light image corresponding to different driving currents to determine whether the diffractive optical element has been damaged or dropped off" includes the following steps : Judging whether the brightness change range of the structured light image matches the change range of the driving current to determine whether the diffractive optical element is broken or falling off, or by analyzing the structured light image obtained two or more times adjacently Changes in brightness between the two are used to determine whether the diffractive optical element is damaged or detached.
The structured light detection method according to claim 16, wherein the driving current of the light source in the light source module is controlled to change from small to large.
The structured light detection method according to claim 18, wherein after analyzing the structured light image obtained from the current driving current, the driving current is increased, and the structured light image corresponding to the increased driving current is increased. Perform analysis.
The structured light detection method according to any one of claims 11 to 19, further comprising the step of: if it is determined that the diffractive optical element is damaged or detached, controlling the light source or the light source module or the light source module where the light source module is located The electronic equipment stops working or sends an alarm signal or outputs a test result.
An identity recognition device comprising a light source module, characterized in that the identity recognition device further comprises a mode selection module, a light source module, an identification module and the structured light detection device according to any one of claims 1-10, the mode The selection module is used to select a detection mode or a working mode according to user requirements; when the detection mode is selected, the structured light detection device detects whether a diffractive optical element in the light source module is damaged or detached, so as to avoid emission by a light source in the light source module. There is unsafe zero-order diffracted light in the structured light emitted by the diffracted optical element after being modulated by the diffractive optical element, or the light emitted by the light source in the light source module is directly emitted without being modulated by the diffractive optical element; when the working mode is selected , The identification module performs identity identification.
The identification device according to claim 21, wherein when the working mode is selected, the light source module is configured to emit structured light to an object to be measured; the sensing module in the structured light detection device is configured to obtain the measured light. An image of structured light reflected by the object to be measured; the identification module is configured to perform identity recognition based on the image obtained by the sensing module.
The identification device according to claim 22, wherein the identification device further comprises another sensing module for identification, and when the working mode is selected, the light source module is configured to emit structured light to a test object. An object; the sensing module for identity recognition acquires an image of structured light reflected by the object to be measured; the recognition module performs identity recognition based on the image obtained by the sensing module for identity recognition.
The identification device according to claim 21, wherein the structured light detection device is configured to control the light source module to stop working or control the identification device when it is determined that the diffractive optical element in the light source module is damaged or detached. Stop working or send an alarm signal or output test results.
The identity recognition device according to claim 21, wherein the identity recognition device comprises a face recognition device.
An electronic device includes the identity recognition device according to any one of claims 21 to 25, and the electronic device is configured to correspondingly execute a corresponding function according to a recognition result of the identity recognition device.
The electronic device according to claim 26, wherein the corresponding function comprises any one or more of unlocking, paying, and starting a pre-stored application.