CN110308568B - Method and device for preventing human eyes from being damaged by laser of structured light depth camera - Google Patents
Method and device for preventing human eyes from being damaged by laser of structured light depth camera Download PDFInfo
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- CN110308568B CN110308568B CN201810228795.XA CN201810228795A CN110308568B CN 110308568 B CN110308568 B CN 110308568B CN 201810228795 A CN201810228795 A CN 201810228795A CN 110308568 B CN110308568 B CN 110308568B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4205—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
Abstract
The invention relates to a method and a device for preventing human eyes from being damaged by laser of a structured light depth camera, wherein the method comprises the following steps: collecting a laser coding pattern projected onto a human face by a structured light depth camera; detecting and identifying the collected laser coding pattern, and giving a detection and identification result; selecting a corresponding processing mode for processing according to the detection identification result; and after the processing is finished, the steps are repeatedly executed until the detection recognition result is normal. According to the technical scheme, the laser coding image projected on the face by the structured light depth camera can be detected on line through the infrared camera; the driving circuit can be controlled in real time according to the generated abnormal signal or the generated overexposure signal, and the driving current is cut off or weakened.
Description
Technical Field
The invention relates to the technical field of computer vision, depth perception and laser safety, in particular to a method and a device for preventing human eyes from being damaged by laser of a structured light depth camera.
Background
The structured light depth perception technology is used for perceiving the shape and distance information of a space object, and is a hot spot direction for research and application development in the field of computer vision. Compared with a binocular stereo camera, the active vision depth perception technology based on the structured light can accurately acquire the depth information of the pattern, and the acquired depth map information has the advantages of stability, reliability, no influence of ambient light, simple stereo matching process, small algorithm calculation amount and the like. With the development and maturity of the depth perception technology, the technology is combined with a face recognition algorithm and applied to the fields of monitoring, recognition and the like.
Active light sources used in the active visual depth perception technology based on structured light are generally infrared laser sources, such as Vertical Cavity Surface Emitting Laser (VCSEL) and Laser Diode (LD) laser sources. Compared with the traditional edge-emitting laser, the vertical cavity surface emitting laser (VSCEL) has small divergence angle and circularly symmetric far-field and near-field distribution, so that the coupling efficiency of the VSCEL and an optical fiber is greatly improved, and a complex and expensive beam shaping system is not needed. However, the laser sources of Vertical Cavity Surface Emitting Lasers (VCSELs) and Laser Diodes (LDs) have strong coherence after being collimated, and when the intensity of the light source is higher than a certain intensity, the light source can cause damage to human eyes, and especially in the field of consumer electronics, the safety requirements of human eyes on laser are very high. The current structure optical depth camera is embedded into various intelligent terminals for application, including smart mobile phone, smart television, VR/AR helmet, robot etc. for effective protection human eye's safety, need carry out automated inspection to laser coding pattern, laser speckle light intensity etc. that the structure optical depth camera throws the generation, prevent to take place abnormal conditions.
Disclosure of Invention
In view of the above disadvantages, the present invention provides a method and an apparatus for preventing human eyes from being damaged by laser of a structured light depth camera, which can effectively prevent human eyes from being damaged by laser of the structured light depth camera.
The invention provides a method for preventing human eyes from being damaged by laser of a structured light depth camera, which comprises the following steps:
collecting a laser coding pattern projected onto a human face by a structured light depth camera;
detecting and identifying the collected laser coding pattern, and detecting and identifying results;
when the detection identification result is abnormal or exposed, selecting a corresponding processing mode for processing;
and after the processing is finished, the steps are repeatedly executed until the detection recognition result is normal.
Optionally, the processing manner includes:
when the laser coding pattern is abnormal, the driving current of the structured light depth camera is cut off and is not recovered;
when the laser coding pattern is over-exposed, the driving current of the structure optical depth camera is weakened.
Optionally, the anomaly comprises any one or more of: the diffractive optics of the structured light depth camera cracks, peels off, and melts.
Optionally, the process of detecting and identifying includes:
extracting pattern blocks with the same size from the middle position and the periphery of the laser coding pattern;
calculating the mean value of the extracted pattern blocks, and respectively calculating the difference value between the mean value of the pattern block at the middle position and the mean values of the pattern blocks at the periphery;
and respectively comparing the difference value with a threshold value, and judging whether the laser coding pattern has abnormity or overexposure according to the comparison result.
The invention also provides a device for preventing human eyes from being damaged by the laser of the structured light depth camera, and the specific technical scheme is described as follows:
an apparatus for preventing a human eye from being injured by laser light of a structured light depth camera, comprising:
the acquisition module is used for acquiring a laser coding pattern projected onto a human face by the structured light depth camera;
the detection and identification module is used for detecting and identifying the collected laser coding patterns and judging the detection and identification results;
the processing module is used for selecting a corresponding processing mode to process when the detection identification result is abnormal or exposed;
and the repeated execution module is used for sequentially triggering the modules until the detection recognition result is normal.
Optionally, the processing module includes an exception handling unit and an exposure handling unit; when the detection and identification result is abnormal, the abnormal processing unit turns off the driving current of the structured light depth camera and does not recover; and when the detection and identification result is exposure, the exposure processing unit weakens the driving current of the structured light depth camera.
Optionally, the anomaly comprises any one or more of: the diffractive optics of the structured light depth camera cracks, peels off, and melts.
Optionally, the detection and identification module includes:
an extraction unit for extracting pattern blocks of the same size from the middle position and the periphery of the laser coding pattern;
the calculating unit is used for calculating the mean value of the extracted pattern blocks and respectively calculating the difference value between the mean value of the pattern block at the middle position and the mean values of the pattern blocks at the periphery;
and the comparison unit is used for comparing the difference value with a threshold value and judging whether the laser coding pattern has abnormity or overexposure according to a comparison result.
The invention also provides an intelligent terminal, which is described in detail as follows:
an intelligent terminal, comprising a memory and a processor, wherein the memory stores computer instructions executable on the processor, and the processor executes the computer instructions to perform any of the method steps.
The invention also provides another intelligent terminal, which is described as follows:
an intelligent terminal is characterized by comprising any one of the devices.
The technical scheme of the invention has the beneficial effects that:
1. laser coded images projected on a human face by the structured light depth camera can be detected on line through the infrared camera;
2. the driving circuit can be controlled in real time according to the generated abnormal signal or the generated overexposure signal, and the driving current is cut off or weakened.
Drawings
FIG. 1 is a flowchart of a method for preventing a human eye from being damaged by laser light of a structured light depth camera according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an apparatus for preventing human eyes from being damaged by laser light of a structured light depth camera according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an embodiment of the present invention showing an abnormality in a laser coding pattern.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the embodiments and the accompanying drawings.
As shown in fig. 1, an embodiment of the present invention provides a method for preventing human eyes from being damaged by laser light of a structured light depth camera, including the following steps:
s100: collecting a laser coding pattern projected onto a human face by a structured light depth camera;
s200: detecting and identifying the collected laser coding pattern, and judging a detection and identification result;
s300: when the detection identification result is abnormal or exposed, selecting a corresponding processing mode for processing;
s400: and after the processing is finished, the steps are repeatedly executed until the detection recognition result is normal.
In the specific embodiment of step S100, the structured light depth camera projects and generates a laser speckle code, and performs 3D irradiation on a human face, and further, in the process of collecting the laser speckle code projected onto the human face, the projection and the reception of the laser coding pattern are synchronized and exposure time controlled, that is, the structured light depth camera may feed back a trigger signal strobe _ ir to a synchronization control unit therein; the synchronization control unit generates a trigger signal strobe _ pro to the laser source of the structured light depth camera.
In the specific embodiment of step S200, the process of detecting and identifying the collected laser coding pattern is as follows:
1) respectively extracting pattern blocks with the same size from the middle position and the periphery (upper, lower, left and right) of the laser coding pattern, and solving the average value of the pattern blocks; the center of a coding block of a corresponding laser coding pattern is determined, a pattern block 1 is extracted, and a pattern block 2, a pattern block 3, a pattern block 4 and a pattern block 5 with the same size are respectively extracted at the periphery (upper, lower, left and right) of the pattern block 1.
2) Calculating the mean value of each extracted pattern block
And calculates the difference values of the mean value of the middle pattern block 1 and the mean values of the pattern blocks 2, 3, 4, 5, i.e., the difference values
3) Determine whether the difference is greater than threshold th1, i.e. Δ x12、Δx13、Δx14、Δx15Whether both are greater than threshold th 1. If Δ x12、Δx13、Δx14、Δx15If the laser coding patterns are all larger than th1, judging that the laser coding patterns are abnormal (namely, the diffraction optical device of the structured light depth camera is likely to crack, fall off, melt and the like), and sending an abnormal signal at the moment; if Δ x12、Δx13、Δx14、Δx15If the phase differences are all less than the threshold th2 and the average value exceeds the threshold th3, it is determined that the laser coding pattern is overexposed (i.e. the human face is too close to the laser source of the structured light depth camera, resulting in overexposure of the laser coding pattern), and an overexposure signal is sent.
In the specific embodiment of step S300, when the detection identification result is determined to have an abnormality or exposure, a corresponding processing manner is adopted, specifically: if abnormity occurs, namely the diffraction optical device of the structured light depth camera is cracked, falls off and is subjected to hot melting, a driving circuit in the structured light depth camera is triggered, and the driving circuit is started and shut off according to a preset command and is not recovered; if the camera is overexposed, the driving circuit is triggered, and the driving current is started and weakened according to a preset command.
In the embodiment of step S400, the above steps are repeatedly executed at time t until the detection result is normal, that is, the laser coding pattern is no longer detected to have abnormality and overexposure. Further, after the detection and identification result is recovered to be normal, the driving circuit in the structured light depth camera recovers the original driving current according to the preset command, and then the camera can continue to work normally. It should be noted that, if the laser coding pattern does not have the above-mentioned abnormality or overexposure phenomenon, the camera is in a normal working state, and the driving circuit does not make any adjustment to the driving current.
In addition to the above method, the technical solution of the present invention also provides a device for preventing human eyes from being damaged by laser of a structured light depth camera, which is described in detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 2, an embodiment of the present invention further provides an apparatus for preventing human eyes from being damaged by laser light of a structured light depth camera, including:
the acquisition module 21 is used for acquiring a laser coding pattern projected onto a human face by the structured light depth camera;
the detection and identification module 22 is used for detecting and identifying the collected laser coding patterns and judging the detection and identification results;
the processing module 23 is configured to select a corresponding processing mode for processing when the detection identification result is abnormal or exposed;
and the repeated execution module 24 is used for sequentially triggering the modules until the detection recognition result is normal.
Further, the processing module comprises an exception handling unit and an exposure handling unit; when the detection and identification result is abnormal, namely the diffraction optical device of the structured light depth camera is cracked, dropped or melted, the abnormal processing unit is started, and a driving circuit in the structured light camera is synchronously controlled to turn off the driving current and is not recovered; and when the detection identification result is exposure, the exposure processing unit is started, and the driving circuit in the structured light camera is synchronously controlled to weaken the driving current.
Further, the detection and identification module comprises an extraction unit, a calculation unit and a comparison unit. The extraction unit is used for extracting pattern blocks with the same size from the middle position and the periphery of the laser coding pattern, and specifically comprises: first, the center of a coding block of a corresponding laser coding pattern is determined, a pattern block 1 is extracted, and pattern blocks 2, 3, 4, and 5 having the same size are extracted around (up, down, left, and right) the pattern block 1.
The calculating unit is used for calculating the mean value of the extracted pattern blocks and respectively calculating the difference value between the mean value of the pattern block at the middle position and the mean values of the pattern blocks at the periphery, and specifically comprises the following steps: calculating the mean value of each extracted pattern block
And respectively calculate the mean value of the intermediate pattern block 1And the difference of the mean values of pattern block 2, pattern block 3, pattern block 4, and pattern block 5, i.e.
The comparison unit is used for comparing the difference value with a threshold value, and judging whether the laser coding pattern has abnormity or overexposure according to a comparison result, and specifically comprises the following steps: determine whether the difference is greater than threshold th1, i.e. Δ x12、Δx13、Δx14、Δx15Whether both are greater than threshold th 1. If Δ x12、Δx13、Δx14、Δx15If the laser coding patterns are all larger than th1, judging that the laser coding patterns are abnormal (namely, the diffraction optical device of the structured light depth camera is likely to crack, fall off, melt and the like), and sending an abnormal signal at the moment; if Δ x12、Δx13、Δx14、Δx15If the phase differences are all less than the threshold th2 and the average value exceeds the threshold th3, it is determined that the laser coding pattern is overexposed (i.e. the human face is too close to the laser source of the structured light depth camera, resulting in overexposure of the laser coding pattern), and an overexposure signal is sent.
The embodiment of the invention also provides an intelligent terminal, which comprises a memory and a processor, wherein the memory stores computer instructions capable of running on the processor, and the processor executes the steps of any one of the methods when running the computer instructions.
The embodiment of the invention also provides another intelligent terminal which comprises any one of the devices.
The present invention also shows an embodiment of the laser coding pattern when the abnormality occurs, as shown in fig. 3.
In this embodiment, when the diffractive optical element of the structured light depth camera is dropped or broken or the temperature is too high to cause thermal fusion, the projected laser coding pattern may be abnormal. For example, a part of speckle points or an intermediate speckle coding base primitive is abnormally bright, namely, the energy of the part of speckle points should be originally distributed on other blocks, and the energy is too large due to the abnormality of the diffraction optical device. Essentially, when the diffractive optical device is damaged, the laser coding pattern is focused by the collimating lens, and then is not copied by the diffractive optical device (the energy of the diffractive optical device can be dispersed into each copying block in the copying and arranging process, so that the energy of the middle pattern block is reduced), and the laser coding pattern is directly projected to the human face, so that the energy of the middle block (the block where the basic primitive is located) is too strong, the pattern on the light-emitting substrate is regularly copied by the diffractive optical device by 5 x 5, when the diffractive optical device is damaged, the energy of the middle pattern block is too strong, and when the human eye is located in the area, the laser coding pattern can bring irreversible damage to the cornea of the human eye.
The technical scheme of the invention can acquire and detect the laser coding image projected on the face by the structured light depth camera on line in real time, can control the driving circuit in real time according to the generated abnormal signal or overexposure signal, and can turn off or weaken the driving current, thereby effectively avoiding the damage of the laser emitted by the laser source of the structured light depth camera to human eyes.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A method of preventing a human eye from being injured by laser light of a structured light depth camera, comprising the steps of:
collecting a laser coding pattern projected onto a human face by a structured light depth camera;
detecting and identifying the collected laser coding pattern, and judging a detection and identification result;
when the detection identification result has abnormity or exposure, selecting a corresponding processing mode for processing, wherein the processing mode comprises the following steps:
when the laser coding pattern is abnormal, a driving circuit in the structured light depth camera is triggered, the driving current of the structured light depth camera is turned off according to a preset command, and the driving current is not recovered;
when the laser coding pattern is over-exposed, weakening the driving current of the structure light depth camera according to a preset command in the structure light depth camera;
and after the processing is finished, the steps are repeatedly executed until the detection recognition result is normal, and meanwhile, the driving circuit in the structured light depth camera restores the original driving current according to the preset command.
2. The method of claim 1, wherein the anomaly comprises any one or more of: the diffractive optics of the structured light depth camera cracks, peels off, and melts.
3. The method of claim 1, wherein the detecting the identification comprises:
extracting pattern blocks with the same size from the middle position and the periphery of the laser coding pattern;
calculating the mean value of the extracted pattern blocks, and respectively calculating the difference value between the mean value of the pattern block at the middle position and the mean values of the pattern blocks at the periphery;
and respectively comparing the difference value with a threshold value, and judging whether the laser coding pattern has abnormity or overexposure according to the comparison result.
4. An apparatus for preventing a human eye from being injured by laser light of a structured light depth camera, comprising:
the acquisition module is used for acquiring a laser coding pattern projected onto a human face by the structured light depth camera;
the detection and identification module is used for detecting and identifying the collected laser coding patterns and judging the detection and identification results;
the processing module is used for triggering a driving circuit in the structured light depth camera when the detection recognition result is abnormal or exposed and switching off or weakening the driving current of the structured light depth camera according to a preset command;
and the repeated execution module is used for sequentially triggering the modules until the detection and identification result is normal and triggering a driving circuit in the structured light depth camera to recover the original driving current according to a preset command.
5. The apparatus according to claim 4, wherein the processing module includes an exception handling unit and an exposure handling unit; when the detection and identification result is abnormal, the abnormal processing unit turns off the driving current of the structured light depth camera and does not recover; and when the detection and identification result is exposure, the exposure processing unit weakens the driving current of the structured light depth camera.
6. The apparatus of claim 4, wherein the anomaly comprises any one or more of: the diffractive optics of the structured light depth camera cracks, peels off, and melts.
7. The apparatus of claim 4, wherein the detection and identification module comprises:
an extraction unit for extracting pattern blocks of the same size from the middle position and the periphery of the laser coding pattern;
the calculating unit is used for calculating the mean value of the extracted pattern blocks and respectively calculating the difference value between the mean value of the pattern block at the middle position and the mean values of the pattern blocks at the periphery;
and the comparison unit is used for comparing the difference value with a threshold value and judging whether the laser coding pattern has abnormity or overexposure according to a comparison result.
8. An intelligent terminal, characterized in that the intelligent terminal comprises a memory and a processor, wherein the memory has stored thereon computer instructions executable on the processor, and the processor executes the computer instructions to perform the steps of the method according to any one of claims 1 to 3.
9. An intelligent terminal, characterized in that the intelligent terminal comprises the apparatus of any of the claims 4 to 7.
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| CN111487633A (en) * | 2020-04-06 | 2020-08-04 | 深圳蚂里奥技术有限公司 | Laser safety control device and method |
| CN111427049A (en) * | 2020-04-06 | 2020-07-17 | 深圳蚂里奥技术有限公司 | Laser safety device and control method |
| CN116381957B (en) * | 2023-05-30 | 2023-09-01 | 深圳市安思疆科技有限公司 | Structured light module |
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