CN108700917B - Structured light detection device and detection method, identity recognition device and electronic equipment - Google Patents
Structured light detection device and detection method, identity recognition device and electronic equipment Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
- G06F1/1684—Constructional details or arrangements related to integrated I/O peripherals not covered by groups G06F1/1635 - G06F1/1675
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
- G06F1/1684—Constructional details or arrangements related to integrated I/O peripherals not covered by groups G06F1/1635 - G06F1/1675
- G06F1/1686—Constructional details or arrangements related to integrated I/O peripherals not covered by groups G06F1/1635 - G06F1/1675 the I/O peripheral being an integrated camera
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
- G06F21/31—User authentication
- G06F21/32—User authentication using biometric data, e.g. fingerprints, iris scans or voiceprints
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
- H04M1/667—Preventing unauthorised calls from a telephone set
- H04M1/67—Preventing unauthorised calls from a telephone set by electronic means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/724—User interfaces specially adapted for cordless or mobile telephones
- H04M1/72448—User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions
- H04M1/72463—User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions to restrict the functionality of the device
Abstract
The application is applicable to the technical field of optics and electronics, and provides a structured light detection device which is used for detecting whether a diffraction optical element in a light source module is damaged or falls off so as to avoid unsafe zero-order diffraction light existing in structured light generated by the light source module or directly emitting light emitted by a light source of the light source module without being modulated by the diffraction optical element. The structured light detection device comprises a sensing module and an image analysis module. The sensing module obtains a light beam reflected by the structured light emitted by the light source module after being projected onto a target object so as to obtain at least one structured light image. The image analysis module analyzes the brightness of different areas in at least one structured light image to judge whether the diffraction optical element is damaged or falls off. The application also provides a structured light detection method, an identity recognition device and an electronic device. According to the method and the device, whether unsafe zero-order diffraction light exists in the structured light or not can be effectively detected, and whether direct irradiation of the light source occurs or not can be effectively detected.
Description
Technical Field
The present application relates to the field of optical and electronic technologies, and in particular, to a structured light detection apparatus and detection method, an identity recognition apparatus, and an electronic device.
Background
With the rapid development of optical technology, the application range of structured light (structured light) is becoming wider and wider, such as face recognition, projector, 3D contour reconstruction, distance measurement, anti-counterfeit recognition, etc. A current light source module for emitting structured light includes a light source and a Diffractive Optical Element (DOE). The diffraction optical element is used for modulating the light beam emitted by the light source to form patterned structured light.
The present light source module is generally designed on the DOE in the production development stage to minimize the unsafe light (such as zero-order diffraction light) in the structured light. However, in practice, there are a number of factors that contribute to the existence of unsafe light in structured light. When the DOE falls off from the light source module or the DOE is damaged (for example, the microstructure of the DOE changes due to high temperature, the DOE is damaged or broken, dust particles enter, and the like), a part of light emitted by the light source is directly emitted without being diffracted by the DOE, and zero-order diffracted light is generated. When the intensity of the zero-order diffraction light is too large and exceeds the safety standard, the eyes of the user can be damaged. When the DOE is entirely removed, light emitted from the light source is not directly emitted through the DOE, and therefore safety of a user is seriously harmed.
Disclosure of Invention
The present application is directed to a structured light detection apparatus and a detection method thereof, which can effectively detect whether there is unsafe zero-order diffraction light in the structured light generated by a light source module, and whether the light generated by the light source is directly emitted without passing through a diffractive optical element.
The structured light detection device is used for detecting whether a diffraction optical element in a light source module is damaged or falls off so as to avoid unsafe zero-order diffraction light existing in structured light emitted by a light source in the light source module after the light passes through the diffraction optical element or direct emission of the light emitted by the light source in the light source module without passing through the diffraction optical element. The structured light detection device comprises a sensing module and an image analysis module. The sensing module is used for acquiring a light beam reflected by the structured light emitted by the light source module after being projected onto a target object so as to obtain at least one structured light image. The image analysis module is used for analyzing the brightness of different areas in the at least one structured light image so as to judge whether the diffraction optical element is damaged or falls off.
The application also provides a structured light detection method for detecting whether a diffractive optical element in a light source module is damaged or falls off so as to avoid unsafe zero-order diffraction light existing in structured light emitted by a light source in the light source module after the light passes through the diffractive optical element or light emitted by the light source in the light source module is directly emitted without passing through the diffractive optical element; the method comprises the following steps:
acquiring a light beam reflected by the structured light emitted by the light source module after being projected onto a target object so as to obtain at least one structured light image; and
and analyzing the brightness of different areas in the at least one structured light image to judge whether the diffraction optical element is damaged or falls off.
The application also provides an identity recognition device which comprises a light source module, a mode selection module and the structural light detection device. The mode selection module is used for selecting a detection mode or a working mode according to the requirements of users. 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 falls off so as to avoid unsafe zero-order diffraction light in the structured light emitted by the light source in the light source module after the light emitted by the light source in the light source module passes through the diffractive optical element or direct emission of the light emitted by the light source in the light source module without passing through the diffractive optical element; when the working mode is selected, the identification module carries out identity identification.
The application also provides an electronic device comprising the identity recognition device. The electronic equipment is used for correspondingly executing corresponding functions according to the identification result of the identity identification device.
Compared with the prior art, the application has the beneficial effects that: the light source module can effectively detect whether unsafe zero-order diffraction light exists in the structured light generated by the light source module or not and whether the light of the light source is directly emitted out without the diffraction optical element or not, so that the unsafe light is prevented from directly irradiating eyes, and the use safety of a user is effectively protected.
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.
Fig. 3 and 4 are flowcharts of a method for detecting structured light according to a third embodiment of the present application.
Fig. 4 is a partial flowchart of a method for detecting structured light according to a third embodiment of the present application.
Fig. 5 is a functional block diagram of an identification apparatus according to 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 Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The following disclosure provides many different embodiments or examples for implementing different features of the application. To simplify the disclosure of the present application, the components and settings of a specific example are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of brevity and clarity and do not in themselves dictate a relationship between the various embodiments and/or configurations discussed.
Further, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter can be practiced without one or more of the specific details, or with other structures, components, and so forth. 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 apparatus 100 according to a first embodiment of the present disclosure is used for detecting whether a diffractive optical element in a light source module is damaged or falls off, so as to prevent unsafe zero-order diffracted light from being present in structured light emitted by a light source in the light source module after the light emitted by the light source passes through the diffractive optical element, or light emitted by the light source in the light source module is directly emitted without passing 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 (VCSEL), or other suitable type of light source device. In some embodiments, the light source module includes a plurality of light sources, such as but not limited to point light sources, and the light emitted from the point light sources in the light source module forms a surface light source at a predetermined distance.
The structure light detection device 100 includes a sensing module 10, an image analysis module 20, and an alarm module 30.
The sensing module 10 is configured to obtain a light beam reflected by the structured light emitted by the light source module after being projected onto a target object, so as to obtain at least one structured light image.
The image analysis module 20 is configured to analyze the brightness of different areas in the at least one structured light image to determine whether the diffractive optical element is damaged or falls off.
In this embodiment, the different area is an area where the light spot is located in the structured-light image.
The image analysis module 20 stores a brightness threshold. The safe brightness threshold is obtained by analyzing the brightness values 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 working current of the light source. The drive current value is varied from small to large in small steps.
The image analysis module 20 is used to calculate the number of light spots in the structured light image. If the number of the 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 value, determining that the diffraction optical element integrally falls off, so that the light emitted by the light source in the light source module is not directly emitted through the diffraction optical element; if the number of the light spots in the structured light image is more than one and the brightness of the area where at least one light spot is located is more than the safety brightness threshold, it is determined that the diffractive optical element is damaged or partially falls off, so that zero-order diffraction light exists in the structured light generated by the light source module or part of light emitted by the light source in the light source module is directly emitted without being modulated by the diffractive optical element.
In other embodiments, the image analysis module 20 may also compare the brightness of each pixel point in at least one region in the at least one structured-light image with the safe brightness threshold, and determine that the diffractive optical element is damaged or falls off if the brightness of a plurality of consecutive pixel points is greater than the safe brightness threshold.
The warning module 30 is configured to control a corresponding light source in the light source module to stop working or control the light source module to stop working or send an alarm signal or output a detection result when the image analysis module 20 determines that the diffractive optical element in the light source module is damaged or falls off.
As shown in fig. 2, a structured-light detecting apparatus 200 according to a second embodiment of the present application includes a sensing module 210 and an image analyzing module 220. The structured light detection apparatus 200 mainly differs from the structured light detection apparatus 100 of the first embodiment in that the structured light detection apparatus 200 further includes a control module 240. The control module 240 is used for controlling a driving current of a light source in the light source module (not shown) to control a light emitting intensity of the light source. Wherein, the minimum value of the driving current is zero value, and the maximum value is the maximum working current of the light source; the drive current value is varied from small to large in small steps.
Since the time interval between two consecutive frames of structured light images is short, it can be considered that the shooting environment is almost unchanged, and the image analysis module 220 is configured to analyze the brightness of different areas in the structured light images corresponding to different driving currents to determine whether the diffractive optical element is damaged or falls off.
Specifically, the image analysis module 220 determines whether the diffractive optical element is damaged or falls off by determining whether the brightness variation amplitude of the structured light image matches the variation amplitude of the driving current. If not, the diffraction optical element is determined to be broken or dropped. If the two are matched, 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 variation between two or more adjacent structured light images. For example, when the driving current of the light source is zero, the light source module does not emit structured light, and the brightness of any pixel in the structured light image is Pref (x, y); when the driving current of the light source is increased to a certain preset current value, the light source module emits the structured light, and the brightness of any pixel point in the structured light image is Pget (x, y). If Pget (x, y) is equal to or greater than Pref (x, y) + Thd, it is determined that the diffractive optical element is broken or detached. Wherein Thd is a brightness variation threshold corresponding to the predetermined current value.
Further, the control module 240 controls the driving current of the light source in the light source module to change 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 finishes analyzing 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.
As shown in fig. 3, a third embodiment of the present application provides a method for detecting structured light, for detecting whether a diffractive optical element in a light source module is damaged or falls off, so as to avoid unsafe zero-order diffracted light existing in structured light emitted by a light source in the light source module after passing through the diffractive optical element, or light emitted by the light source in the light source module is not directly emitted by the diffractive optical element, including the following steps:
s1: and acquiring a light beam reflected by the structured light emitted by the light source module after being projected onto a target object so as to obtain at least one structured light image.
S2: and analyzing the brightness of different areas in the at least one structured light image to judge whether the diffraction optical element is damaged or falls off.
S3: if the light source is detected to be broken or fallen (i.e. the diffractive optical element is damaged or falls off), the light source or the light source module or the electronic device where the light source module is located is controlled to stop working or to send out an alarm signal (for example, a buzzer or a warning lamp or a display screen presents warning information) or to output a detection result.
S4: if not (i.e., if 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 area is an area where the light spot in the structured-light image is located. As shown in fig. 4, the step S2 includes the following steps:
s21: and judging whether the number of the light spots in the structured light image is only one.
S22: if the number of the light spots is only one, whether the brightness of the area where the unique light spot is located is larger than a safe brightness threshold value or not is judged. The safe brightness threshold is obtained by analyzing the brightness values of the structured light images 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 working current of the light source; the drive current value is varied from small to large in small steps.
S23: if the light spot is larger than the safety brightness threshold value, determining that the diffraction optical element integrally falls off, so that the light emitted by the light source in the light source module is not directly emitted through the diffraction optical element; proceed to step S3.
S24: if not (i.e., the brightness of the area where the light spot is located is less than or equal to the safety brightness threshold), it is determined that the diffractive optical element is not damaged or dropped, and the process proceeds to step S4.
S25: and if the number of the light spots in the structured light image is more than one, judging that the brightness of the area where at least one light spot is located is more than the safe brightness threshold value.
S26: if so (namely, the brightness of the area where at least one light spot is located is greater than the safe brightness threshold), determining that the diffraction optical element is damaged or partially falls off, so that zero-order diffraction light exists in the structured light generated by the light source module; proceed to step S3.
S27: if not (i.e. the brightness of the area where at least one light spot is located is less than or equal to the safety brightness threshold), it is determined that the diffractive optical element is not damaged or dropped, and the process proceeds to step S4.
In other embodiments, the step S2 may also include the following steps: controlling a driving current of a light source in the light source module to control a luminous intensity of the light source; and analyzing the brightness of different areas in the structured light image corresponding to different driving currents to judge whether the diffraction optical element is damaged or falls off.
Wherein, the minimum value of the driving current is zero value, and the maximum value is the maximum working current of the light source; the drive current value is varied from small to large in small steps.
Specifically, since the time interval between two consecutive frames of structured light images is short, it can be considered that the shooting environment is almost unchanged, and therefore, the step of "analyzing the brightness of different areas in the structured light images corresponding to different driving currents to determine whether the diffractive optical element is damaged or falls off" includes the following steps: and judging whether the diffraction optical element is damaged or falls off by judging whether the brightness change amplitude of the structured light image is matched with the change amplitude of the driving current. If not, it is determined that the diffractive optical element is broken or detached. If the matching is not achieved, it is determined that the diffractive optical element is not broken or detached.
In another embodiment, the step of analyzing the brightness of different areas in the structured-light image corresponding to different driving currents to determine whether the diffractive optical element is damaged or detached includes the following steps: whether the diffraction optical element is damaged or fallen off is judged by analyzing the brightness change condition between the structured light images obtained at two or more adjacent times. For example, when the driving current of the light source is zero, the light source module does not emit structured light, and the brightness of any pixel point in the structured light image is Pref (x, y); when the driving current of the light source is increased to a certain preset current value, the light source module emits the structured light, and the brightness of any pixel point in the structured light image is Pget (x, y). If Pget (x, y) is equal to or greater than Pref (x, y) + Thd, it is determined that the diffractive optical element is broken or detached. Wherein Thd is a brightness variation threshold corresponding to the predetermined current value.
Further, in order to prevent the light emitted from the light source module from being too strong and damaging 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 identification apparatus 300 according to 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 apparatus 100(200) according to the first embodiment or the second embodiment.
The mode selection module 310 is used to select "operation mode" or "detection mode" according to the user's requirement.
The recognition module 330 is used for identification when the "operation mode" is selected. Specifically, the light source module 320 is configured to emit the structured light and project the structured light to an object to be measured. The sensing module in the structured light detection apparatus 100(200) is used to acquire an image of the structured light reflected by the object to be detected. The identification module 330 is used for performing identity identification according to the image acquired by the sensing module.
Of course, in other embodiments, the identification device 300 further includes a sensing module for specialized identification. The sensing module for identity recognition is used for acquiring an image of structured light reflected by the object to be detected in the identity recognition process. The sensing module in the structure light detecting apparatus 100(200) is used for acquiring an image of the structure light reflected by the object to be detected during the structure light detection process.
When the "detection mode" is selected, the structured light detection apparatus 100(200) detects whether the diffractive optical element in a light source module is damaged or falls off, so as to prevent unsafe zero-order diffracted light from the structured light emitted by the light source in the light source module after passing through the diffractive optical element, or prevent the light emitted by the light source in the light source module from being directly emitted without passing through the diffractive optical element.
The structured light detection apparatus 100(200) is further configured to control the light source or the light source module 320 or the identification apparatus 300 to stop working or to send an alarm signal or output a detection result when it is determined that the diffractive optical element in the light source module is damaged or falls off.
The identification device 300 is, for example, a face recognition device. However, the identification device 300 may also be used to identify other suitable parts of the human body, even other living or non-living organisms.
As shown in fig. 6, a fifth embodiment of the present invention provides an electronic device 400, which is, for example, but not limited to, an electronic product of a suitable type, such as a consumer electronic product, a home electronic product, a vehicle-mounted electronic product, a financial terminal product, and the like. The consumer electronic products include, but are not limited to, mobile phones, tablet computers, notebook computers, desktop displays, all-in-one computers, and the like. Examples of household electronic products include, but are not limited to, smart door locks, televisions, refrigerators, wearable devices, and the like. The vehicle-mounted electronic product is, for example, but not limited to, a vehicle-mounted navigator, a vehicle-mounted DVD, or the like. Examples of financial end products are, but are not limited to, ATMs, self-service terminals, etc.
The electronic device 400 comprises the identification device 300. The electronic device 400 correspondingly executes a corresponding function according to the identification result of the identification apparatus 300. The corresponding function includes, for example but not limited to, unlocking, paying, starting any one or more of the pre-stored applications.
In this embodiment, the electronic device 400 is described as an example of a mobile phone. The mobile phone is a full-screen mobile phone, and the identification device 300 is disposed on the top of the front face of the mobile phone. Of course, the handset is not limited to a full screen handset.
For example, when the user needs to unlock the mobile phone, lifting the mobile phone or touching the screen of the mobile phone may wake up the identification apparatus 300. When the user in front of the mobile phone is a legal user after the identification device 300 is awakened, the screen is unlocked.
Compared with the prior art, the structured light detection device and detection method, the identity recognition device and the electronic equipment can effectively detect whether the zero-order diffracted light beam exists in the structured light, so that the safety of a user is effectively protected.
In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (17)
1. A structured light detection device is used for detecting whether a diffraction optical element in a light source module is damaged or falls off so as to avoid unsafe zero-order diffraction light in structured light emitted after light emitted by a light source in the light source module is modulated by the diffraction optical element or light emitted by the light source in the light source module is directly emitted without being modulated by the diffraction optical element; the device is characterized in that the structured light detection device comprises a sensing module and an image analysis module, wherein the sensing module is used for acquiring a light beam reflected by a target object after the structured light emitted by the light source module is projected to the target object so as to obtain a structured light image; the image analysis module is used for analyzing the brightness of different areas in the structured light image to judge whether the diffraction optical element is damaged or falls off, wherein the structured light detection device further comprises a control module which is used for controlling the driving current of the light source in the light source module so as to control the luminous intensity of the light source; the image analysis module is used for analyzing the brightness of different areas in the structured light images corresponding to different driving currents so as to judge whether the diffractive optical element is damaged or falls off by judging whether the brightness change amplitude of the structured light images is matched with the change amplitude of the driving currents, or the image analysis module judges whether the diffractive optical element is damaged or falls off by analyzing the brightness change condition between two or more adjacent structured light images.
2. The structured light detection apparatus of claim 1, wherein the different region is a region where a light spot in the structured light image is located.
3. The structure light detecting device as in claim 1, wherein the control module is configured to control a driving current of the light source within the light source module to vary from small to large.
4. The structured-light detection device of claim 3, wherein the control module increases the driving current after the image analysis module analyzes the structured-light image obtained from the current driving current, and the image analysis module analyzes the structured-light image corresponding to the increased driving current.
5. A structured light detection apparatus as claimed in claim 1, further comprising an alarm module for controlling the light source or the light source module to stop operating or to issue an alarm signal or output a detection result when it is determined that the diffractive optical element in the light source module is broken or detached.
6. A structured light detection method is used for detecting whether a diffraction optical element in a light source module is damaged or falls off so as to avoid unsafe zero-order diffraction light in structured light emitted after light emitted by a light source in the light source module is modulated by the diffraction optical element or light emitted by the light source in the light source module is directly emitted without being modulated by the diffraction optical element; which comprises the following steps:
acquiring a light beam reflected by the structured light emitted by the light source module after being projected onto a target object so as to obtain at least one structured light image; and
analyzing the brightness of different areas in the at least one structured light image to judge whether the diffractive optical element is damaged or falls off, wherein the driving current of the light source in the light source module is controlled to control the luminous intensity of the light source; and analyzing the brightness of different areas in the structured light images corresponding to different driving currents to judge whether the diffractive optical element is damaged or falls off by judging whether the brightness change amplitude of the structured light image is matched with the change amplitude of the driving current, or judging whether the diffractive optical element is damaged or falls off by analyzing the brightness change condition between the structured light images obtained twice or for multiple times.
7. The structured light detection method of claim 6, wherein the different region is a region in which a spot of light in the structured light image is located.
8. The structured light detection method as claimed in claim 6, wherein a driving current of the light source in the light source module is controlled to be changed from small to large.
9. The structured light detection method according to claim 8, wherein after the structured light image obtained from the present drive current is analyzed, the drive current is increased, and the structured light image corresponding to the increased drive current is analyzed.
10. A structured light detection method as claimed in any one of claims 6 to 9, further comprising the step of: and if the diffraction optical element is determined to be damaged or fall off, controlling the light source or the light source module or the electronic equipment where the light source module is located to stop working or sending an alarm signal or outputting a detection result.
11. An identification device, comprising a light source module, wherein the identification device further comprises a mode selection module, a light source module, an identification module and the structured light detection device of any one of claims 1 to 5, the mode selection module is configured to select a detection mode or an operation mode according to a user requirement; 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 falls off so as to avoid unsafe zero-order diffraction light existing in the structured light emitted after the light emitted by the light source in the light source module is 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 carries out identity identification.
12. The identification appliance of claim 11 wherein the light source module is adapted to emit structured light toward an object to be sensed when the operating mode is selected; a sensing module in the structured light detection device is used for acquiring an image of structured light reflected by the object to be detected; the identification module is used for carrying out identity identification according to the image acquired by the sensing module.
13. The identification device of claim 12 further comprising another sensing module for identification, wherein the light source module is adapted to emit structured light toward an object to be measured when the operating mode is selected; the sensing module for identity recognition acquires an image of structured light reflected by the object to be detected; the identification module carries out identity identification according to the image acquired by the sensing module for identity identification.
14. The identification device according to claim 11 wherein the structured light detector is configured to control the light source module to stop operating or to control the identification device to stop operating or to generate an alarm signal or output a detection result when it is determined that the diffractive optical element in the light source module is damaged or removed.
15. The identification appliance of claim 11 wherein the identification means comprises facial recognition means.
16. An electronic device comprising the identification device of any one of claims 11-15, wherein the electronic device is configured to correspond whether to execute a corresponding function according to the identification result of the identification device.
17. The electronic device of claim 16, wherein: the corresponding functions comprise any one or more of unlocking, payment and starting of prestored application programs.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2018/088473 WO2019223002A1 (en) | 2018-05-25 | 2018-05-25 | Structure light detection device and detection method, identity recognition device and electronic device |
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| WO2020087241A1 (en) * | 2018-10-30 | 2020-05-07 | 深圳市汇顶科技股份有限公司 | Under-screen optical fingerprint device and handheld device having three-dimensional fingerprint anti-counterfeit sensing function |
| CN109932828A (en) * | 2019-02-01 | 2019-06-25 | 杭州驭光光电科技有限公司 | Light projection method and light projecting apparatus |
| CN113711229B (en) * | 2019-05-31 | 2024-03-12 | Oppo广东移动通信有限公司 | Control method of electronic device, and computer-readable storage medium |
| CN112577715A (en) * | 2019-09-27 | 2021-03-30 | 三赢科技（深圳）有限公司 | Point inspection method, point inspection device and computer device |
| CN112938406A (en) * | 2021-02-02 | 2021-06-11 | 锐思为精(武汉)科技有限公司 | Optical module testing device capable of continuously detecting |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014197166A (en) * | 2013-03-07 | 2014-10-16 | セイコーエプソン株式会社 | Optical element, method for manufacturing optical element, and projector |
| CN105890520A (en) * | 2016-04-20 | 2016-08-24 | 感知控股集团有限公司 | Structured light generating device and structured light measuring system |
| CN107608167A (en) * | 2017-10-11 | 2018-01-19 | 深圳奥比中光科技有限公司 | Laser projection device and its method of controlling security |
| CN107860558A (en) * | 2017-10-11 | 2018-03-30 | 深圳奥比中光科技有限公司 | Diffraction optical element monitoring device and method |
| CN107884157A (en) * | 2017-11-28 | 2018-04-06 | 维沃移动通信有限公司 | A kind of method for detecting abnormality of diffractive-optical element, mobile terminal |
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| CN107783361B (en) * | 2017-10-25 | 2020-11-03 | 深圳奥比中光科技有限公司 | Optical projection device containing light beam monitoring unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014197166A (en) * | 2013-03-07 | 2014-10-16 | セイコーエプソン株式会社 | Optical element, method for manufacturing optical element, and projector |
| CN105890520A (en) * | 2016-04-20 | 2016-08-24 | 感知控股集团有限公司 | Structured light generating device and structured light measuring system |
| CN107608167A (en) * | 2017-10-11 | 2018-01-19 | 深圳奥比中光科技有限公司 | Laser projection device and its method of controlling security |
| CN107860558A (en) * | 2017-10-11 | 2018-03-30 | 深圳奥比中光科技有限公司 | Diffraction optical element monitoring device and method |
| CN107884157A (en) * | 2017-11-28 | 2018-04-06 | 维沃移动通信有限公司 | A kind of method for detecting abnormality of diffractive-optical element, mobile terminal |
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