CN112995619A - Projection display control method and device and projection system - Google Patents
Projection display control method and device and projection system Download PDFInfo
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- CN112995619A CN112995619A CN201911281657.9A CN201911281657A CN112995619A CN 112995619 A CN112995619 A CN 112995619A CN 201911281657 A CN201911281657 A CN 201911281657A CN 112995619 A CN112995619 A CN 112995619A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3191—Testing thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
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Abstract
The application discloses a projection display control method, a projection display control device and a projection system, wherein the method comprises the steps of sending a first control instruction to a distance measuring device so that the distance measuring device judges whether a target object exists in a preset detection range or not; if the target object exists in the preset detection range, sending a second control instruction to the face detection device so that the face detection device detects whether a face exists in the projection scene; if the human face exists in the projection scene, a first brightness adjusting signal is sent to the projection device so as to control the brightness of the projection image output by the projection device to be reduced to a safe brightness range. Through the mode, the brightness output by the projection device can be adjusted in a self-adaptive mode, and the harm to human eyes is reduced.
Description
Technical Field
The application relates to the technical field of projection, in particular to a projection display control method, a projection display control device and a projection system.
Background
Along with the development of display technology, the application of projection equipment is more and more extensive, including education projectors, home projectors, engineering projectors and the like, which bring great changes to the life, study and work of people, and along with the development of Light sources of projection display from Ultra High Performance (UHP), xenon lamps, Light Emitting Diodes (LEDs) to present laser and laser fluorescent powder, the Performance of the projectors in all aspects has great leap. The existing laser projection technology takes laser as a light source, can truly reproduce abundant and bright colors of an objective world, provides extremely shocking expressive force, and has longer service life and high reliability of the laser light source. In addition, from the colorimetry perspective, the color gamut coverage rate of laser display can reach more than 90% of the color space which can be identified by human eyes, is more than twice of the color gamut coverage rate of the traditional display, thoroughly breaks through the defect of the color gamut space of the display technology of the first three generations, realizes the most perfect color projection display of human beings since history, but is not applied in a large scale due to the cost and other reasons. The laser fluorescence display technology adopts a technical route of mixing fluorescence with multicolor laser, organically combines the characteristics of small optical expansion amount and wide color gamut of the laser with the characteristics of high efficiency and no speckle of the fluorescence, has the advantages of low cost, high brightness, high efficiency, wide color gamut, no speckle and the like, and revolutionarily solves the difficulties encountered by laser display industrialization.
However, although the laser projector has the above-mentioned incomparable advantages, in order to improve the display brightness, the laser emitting laser needs higher power and has a narrow laser spectrum and high intensity, which is easy to cause damage to human eyes and even cause blindness; the traditional protection mode can not respond to human eyes, the misjudgment rate is high, the response speed is low, the reliability is poor, and the safety factor is not high enough.
Disclosure of Invention
The application mainly solves the problem of providing a projection display control method, a projection display control device and a projection system, which can adaptively adjust the brightness output by a projection device and reduce the damage to human eyes.
In order to solve the technical problem, the technical scheme adopted by the application is as follows: there is provided a projection display control method, the method including: sending a first control command to a ranging device so that the ranging device judges whether a target object exists in a preset detection range or not; if the target object exists in the preset detection range, sending a second control instruction to the face detection device so that the face detection device detects whether a face exists in the projection scene; if the human face exists in the projection scene, a first brightness adjusting signal is sent to the projection device so as to control the brightness of the projection image output by the projection device to be reduced to a safe brightness range.
In order to solve the above technical problem, another technical solution adopted by the present application is: there is provided a projection display control apparatus comprising a memory and a processor connected to each other, wherein the memory is used for storing a computer program, and the computer program, when executed by the processor, is used for implementing the projection display control method described above.
In order to solve the above technical problem, another technical solution adopted by the present application is: the projection system comprises a projection device, a distance measuring device, a human face detection device and a projection display control device, wherein the projection device is used for emitting a projection light beam and forming a projection image on a projection plane; the distance measuring device is used for judging whether a target object exists in a preset detection range or not; the human face detection device is used for detecting whether a human face exists in the projection scene; the projection display control device comprises a memory and a processor, the memory is used for storing a computer program, and the computer program is used for realizing the projection display control method when being executed by the processor.
Through the scheme, the beneficial effects of the application are that: the method comprises the steps of firstly detecting a target object based on a distance measuring device, controlling a face detection device to detect the face of a projection scene when the target object is in a preset detection range, reducing the brightness of a light beam output by a projection device after the face is detected, reducing the brightness of the light beam to be within an acceptable range of human eyes, and performing targeted protection on the human eyes, so that misjudgment caused by obstacles or animals can be reduced, misjudgment caused by the detection of a remote face and the detection of the face in a projection picture can also be reduced, the misjudgment rate is reduced, the safety factor for protecting the human eyes and the user experience can be greatly improved, the operation stability is good, and the response speed is high.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
fig. 1 is a schematic flowchart of an embodiment of a projection display control method provided in the present application;
FIG. 2 is a schematic flowchart of another embodiment of a projection display control method provided in the present application;
FIG. 3 is a schematic flow chart of step 22 in the embodiment shown in FIG. 2;
FIG. 4 is a schematic diagram of an embodiment of a projection system provided in the present application;
FIG. 5 is a schematic diagram of a projection screen and a projection apparatus according to the embodiment shown in FIG. 4;
FIG. 6 is a schematic structural diagram of an embodiment of a projection display control apparatus provided in the present application;
fig. 7 is a schematic view of the installation of the laser ranging sensor and the camera head in the embodiment shown in fig. 4.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic flowchart illustrating an embodiment of a projection display control method provided in the present application, the method including:
step 11: and sending a first control command to the ranging device so that the ranging device judges whether a target object exists in a preset detection range.
The distance measuring device comprises a laser distance measuring sensor based on Time of flight (ToF), which is called as a ToF laser distance measuring sensor for short, wherein the ToF laser distance measuring sensor is used for measuring the distance of a target object appearing in a preset detection range, and the distance of the target object is obtained by emitting and receiving invisible laser with the wavelength of 940nm and measuring the air Time difference; through setting up ToF laser ranging sensor's parameter, can strengthen its interference killing feature to ambient light and dust, reduce the erroneous judgement rate to being close to 0. The ToF laser ranging sensor can detect the detection distance of more than 50cm within 20ms, and has the advantages of sensitive response, high accuracy, stability and reliability.
The preset detection range in this embodiment refers to a range that the distance measuring device can detect in the current projection scene, and the detection range is related to the detection capability of the distance measuring device and also related to the detection scene.
Step 12: and if the target object exists in the preset detection range, sending a second control instruction to the face detection device so that the face detection device detects whether a face exists in the projection scene.
The target object includes an obstacle, a human face, or an animal face. The distance measuring device detects a target object, and if the target object is detected, a second control command is sent to the face detection device, the face detection device comprises a camera device and an image processing device, the camera device shoots a current projection scene, and the image processing device processes the shot image or video and detects whether a face appears in the projection scene.
Step 13: if the human face exists in the projection scene, a first brightness adjusting signal is sent to the projection device so as to control the brightness of the projection image output by the projection device to be reduced to a safe brightness range.
If the human face exists in the current scene image, the first brightness adjusting signal can be output to the projection device, the projection device can be a laser projector, after the projection device receives the first brightness adjusting signal, the brightness of the output light beam can be reduced, so that damage to human eyes when the human eyes face the projection device is reduced, the protection of the human eyes is facilitated, if a person backs on the projection device or a target object is a non-human, the human face detection device cannot detect the human face or the human eyes, and the projection device does not need to be controlled to adjust the brightness of the light beam.
The embodiment provides a projection display control method, which is characterized in that a control instruction is sent to a distance measuring device and a face detection device, so that the distance measuring device can detect whether a target object exists in a preset detection range, the face detection device can perform face detection when the target object exists in the preset detection range, judge whether a face facing a projection device exists in a current scene, and adaptively adjust the brightness of a light beam output by the projection device when the face facing the projection device exists in the current scene, so as to reduce the harm to human eyes.
Referring to fig. 2, fig. 2 is a schematic flowchart illustrating another embodiment of a projection display control method provided in the present application, the method including:
step 21: and sending a first control instruction to each laser ranging sensor so that each laser ranging sensor detects whether a target object exists in a corresponding preset range.
Respectively sending a starting instruction to the distance measuring device, the camera device, the human face detection device and the projection device to start each device; the distance measuring device comprises at least two ToF laser distance measuring sensors, wherein the installation distance between the adjacent ToF laser distance measuring sensors is smaller than the size of a preset face part of a human face, so that a blind area between the ToF laser distance measuring sensors when the human face approaches is covered, but the installation distance is not limited to a numerical value close to the size of the face part of the human face.
If the detection means does not detect the target object, the projection means need not be controlled to adjust the brightness of the output light beam.
Step 22: and if the target object exists in the preset detection range, sending a second brightness adjusting signal to the projection device, and controlling the brightness output by the projection device to be reduced to the warning brightness range.
If the target object appears in the preset detection range, which indicates that an object possibly damaged by the laser exists in the current scene, in order to reduce the damage to the object, the projection device can be controlled to adjust the brightness of the laser to be low.
Step 23: and sending a second control instruction to the face detection device so that the face detection device detects whether a face exists in the projection scene.
If the ranging apparatus detects the target object, step 22 may be executed and the step is executed at the same time, which is the same as step 12 and will not be described herein again.
Step 24: if the human face exists in the projection scene, a first brightness adjusting signal is sent to the projection device so as to control the brightness of the projection image output by the projection device to be reduced to a safe brightness range.
It should be noted that the safety luminance range is lower than the warning luminance range.
In this embodiment, if the target object is detected, an instruction is sent to the projection device to reduce the output brightness to the warning range, meanwhile, the face detection device performs face detection, the face detection device controls the camera to acquire the current image, performs image processing and face detection, and if it is detected that a face does exist in the current image, an instruction is sent to the projection device to reduce the output brightness to the acceptable range. The ToF laser ranging sensor and the face detection device are combined for use, on one hand, quick response can be achieved, on the other hand, targeted protection can also be conducted on human eyes, and misjudgment of common obstacles caused by the passing of small animals such as cats or pet dogs can be avoided.
In one embodiment, as shown in FIG. 3, step 22: if the target object is in the preset detection range, a second brightness adjusting signal is sent to the projection device, and the brightness output by the projection device is controlled to be reduced to the warning brightness range, and the method comprises the following steps:
step 221: and if the target object exists in the preset detection range, acquiring the detection distance corresponding to the target object from the distance measuring device.
In this step, when the distance measuring device detects the target object, the detection distance corresponding to the detected target object is further obtained.
In a specific embodiment, the detection distance may be a vertical distance between the target object and the ranging device, for example, the detection device detects the target object a, and the detection distance corresponding to the target object a is 25 cm.
Step 222: and judging whether the detection distance falls within a preset danger range, and if so, sending a second brightness adjustment signal to the projection device.
The projection display control means may set a danger range in advance, the danger range including at least a maximum distance of the danger range and a minimum distance of the danger range.
Judging whether the detection distance falls within a preset danger range, substantially comparing the detection distance with the maximum distance of the danger range and the minimum distance of the danger range, if the detection distance of the target object is not smaller than the minimum distance of the danger range and not larger than the maximum distance of the danger range, enabling the target object to fall within the danger range, sending a second brightness adjusting signal to the projection device by the projection display control device to control the brightness of a projection image output by the projection device to be reduced to the warning brightness range, sending a control instruction to the human face detection device at the same time, and further reducing the brightness of the projection display from the warning brightness range to the safety brightness range when a human face exists in a projection scene.
That is to say, in this embodiment, whether the projection display brightness is controlled to be reduced to the warning brightness range or the projection display brightness is controlled to be reduced to the safety brightness range, the control is performed only when the distance measuring device detects the target object and the distance measuring distance corresponding to the target object falls within the dangerous range.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of a projection system provided in the present application, and the projection system 40 includes a projection display control device 41, a distance measuring device 42, a human face detection device 43, and a projection device 44.
With reference to fig. 4 and fig. 5, the projection system 40 further includes a projection screen 45, the distance measuring device 42 is disposed on the projection device 44 and includes at least two laser distance measuring sensors 421, the arrangement of the at least two laser distance measuring sensors 421 is parallel to the projection plane of the projection device 44, and the distance between two adjacent laser distance measuring sensors 421 is smaller than the preset human face size.
Based on the structure of the projection system 40, the projection display control device 41 sets the risk range in several ways:
in the first case: the detection direction of the distance measuring device 42 faces the projection plane of the projection device 44 (i.e., the projection screen 45)
The projection display control device 41 first receives the distance measured by the plurality of laser distance measuring sensors 421 included in the distance measuring device 42, wherein the distance is the distance d between the distance measuring sensor 421 and the projection plane1，d2，…，dnThen calculating the average value of a plurality of range measurements
Presetting a preset value, wherein the preset value can be a dangerous distance measured experimentally or obtained through logical reasoning, and the direct-view light source possibly causes damage to human eyes when the dangerous distance is smaller than the dangerous distance; in one embodiment, the predetermined value may be 50 cm.
If the calculated average value of the distance measurement is smaller than or equal to the preset value, setting the difference value between the average value and the preset buffer distance as the maximum distance of the dangerous range; the preset buffering distance can be set to be about 3cm, which is far smaller than the size of the human face and achieves the buffering effect.
The average value of the distance measurement is small, such as ultra-short focus or short focus projection, and the maximum value of the dangerous range is set according to the average value of the distance measurement; the goal of the range average minus the buffer distance is to avoid detecting objects on the projection screen 45; the minimum distance of the danger zone is set to zero or a preset buffer distance.
In one embodiment, if a transparent glass protective cover is provided outside the distance measuring device 42, the minimum distance of the dangerous range is set as the sum of the distance between the transparent glass protective cover and the laser distance measuring sensor 421 and the preset buffer distance.
If the average of the calculated ranges is greater than the predetermined value (i.e., the distance between the projection screen 45 and the projection device 44 is large), the predetermined value is set as the maximum distance of the dangerous range.
In the second case: the detection direction of the distance measuring device 42 faces away from the projection plane of the projection device 44, which is the case for ultra-short focus projection, the distance between the projection device 44 and the projection plane is very small, and it is unlikely that a person passes through the middle of the two, so the detection direction of the distance measuring device 42 is set to face away from the projection plane, that is, whether a person passes around the projection device 44 is detected. At this time, the projection display control means 41 sets the maximum distance of the dangerous range to a predetermined value, such as 50 cm. Wherein the minimum distance of the danger zone is set to zero or a preset buffer distance. If a transparent glass protective cover is provided outside the distance measuring device 42, the minimum distance of the dangerous range is set as the sum of the distance between the transparent glass protective cover and the laser distance measuring sensor 421 and the preset buffer distance.
In one embodiment, in order to increase the speed of face detection, the projected scene image recorded by the face detection device 43 may be processed, the size of the image may be reset to the pixel size that can ensure the monitoring effect, so as to increase the speed of face detection, and then converted into a gray-scale image, and histogram equalization is performed to increase the face detection effect; in order to further perform face detection on the processed image, an Adaboost algorithm based on haar features or an algorithm such as a Convolutional Neural Network (CNN) based on deep learning can be used, and whether a face exists can be detected within a very short time within 80 ms; and the human face in the projection picture can be distinguished from the real human face by using a human face living body detection method so as to avoid the interference caused by brightness adjustment after the human face in the projection picture is detected.
The human face detection method based on machine learning is applied to the projection system 40, so that the requirements of detection precision and real-time performance can be better met, whether a target object contains a human face or not can be accurately judged, and then response of whether protection is performed or not is made for human eyes.
The distance measuring device 42 and the face detection device 43 are complementary to each other, and can protect human eyes against the projection device 44, the laser distance measuring sensor 421 can be a ToF laser distance measuring sensor, and the ToF laser distance measuring sensor can detect whether a target object exists in a preset detection range within 20ms, so that the problem of protecting human eyes of the projection device 44 is solved, and the projection device 44 can respond within 0.25s of the appearance of human eyes; only by using ranging judgment, misjudgment may be caused by the occurrence of non-human face obstacles, so that user experience is reduced, and the human face detection device 43 can accurately judge whether a human face exists in a target object appearing in a preset detection range; the aim of pertinently protecting human eyes can be achieved by combining laser ranging and human face detection, interference caused by remote human faces and human faces in projection pictures is eliminated, the response speed meets the IEC human eye protection standard, and user experience is improved.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an embodiment of a projection display control apparatus provided in the present application, in which the projection display control apparatus 60 includes a memory 61 and a processor 62 connected to each other, the memory 61 is used for storing a computer program, and the computer program is used for implementing the projection display control method in the foregoing embodiment when being executed by the processor 62.
The projection display control device 60 can determine whether the target object is within a preset detection range according to the detected distance, and if the target object exists, send an instruction to the projection device to reduce the brightness of the output light beam, and simultaneously control the face detection device to perform face detection, wherein the face detection device can perform image processing and face detection, and if the current image is detected to actually have a real face, send an instruction to the projection device to further reduce the brightness of the light beam to be within an acceptable range for human eyes, so as to achieve the purpose of protecting human eyes.
With continuing reference to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of a projection system provided in the present application, and the projection system 40 includes a projection display control device 41, a distance measuring device 42, a human face detection device 43, and a projection device 44.
The distance measuring device 42 is used for judging whether a target object exists in a preset detection range; the face detection device 44 is used for detecting whether a face exists in the current scene image; the projection display control device 41 is configured to control the distance measuring device 42, the human face detecting device 43, and the projecting device 44, and send a first brightness adjusting signal to the projecting device 44 when detecting that a human face exists in the current scene image, and control the brightness output by the projecting device 44 to be reduced to a first preset brightness range, where the projection display control device 41 is the projection display control device in the foregoing embodiment.
With reference to fig. 4 and fig. 5, the projection system 40 further includes a projection screen 45, the distance measuring device 42 is disposed on the projection device 44, and includes at least two laser distance measuring sensors 421, the arrangement of the at least two laser distance measuring sensors 421 is parallel to the projection plane of the projection device 45, and the distance between two adjacent laser distance measuring sensors 421 is smaller than the preset human face size.
In a specific embodiment, the laser distance measuring sensors 421 are ToF laser distance measuring sensors, the number of the ToF laser distance measuring sensors 421 can be 3 or more than 3, the maximum distance measuring is 200cm, and the required measuring time is 33ms in the long-distance measuring mode; even in a high-speed measurement mode with the measurement time of only 20ms, the measurement distance can reach more than 50cm, the response is sensitive, the accuracy is extremely high, and the requirement on the distance between the projection device 44 and the target object can be met; in addition, by measuring the conical surface angle at an angle of 25 °, a plurality of ToF laser ranging sensors 421 are installed to cover the entire range of the human eyes near the projection device 44.
The face detection means 43 is means for detecting whether or not a face appears based on an image captured by the image sensor 431; the face detection device 43 is disposed on the projection device 44, and the image sensor included in the face detection device 43 is a camera with a shooting angle of view not less than 130 °. The camera is used for photographing the target object after receiving a second control instruction sent by the projection display control device 41 to obtain a current scene image; the analysis module in the face detection device 43 processes the current scene image and detects a face, and sends a notification message to the projection display control device 41 after detecting the face.
In one embodiment, the ToF laser distance measuring sensor 421 and the camera are installed in the same direction and face the projection screen 45, that is, the installation direction of the camera is the same as the detection direction of the ToF laser distance measuring sensor 421, so as to ensure that the detection ranges of the camera are the same and achieve a better protection effect against human eyes, after each device is opened, the ToF laser distance measuring sensor 421 can be initialized, the preset detection range is determined, and the distance measuring device 42 can detect whether a target object appears in the preset detection range at any time; when the ToF laser ranging sensor 421 detects that a target object exists in the preset detection range, a signal is sent to the projection display control device 41, and the projection display control device 41 sends an instruction to the face detection device 43 to perform face detection, so as to determine whether the brightness of the light beam output by the projection device 44 needs to be adjusted; and meanwhile, whether the target object contains a human face is further judged according to the human face detection result, and if the human face exists, the projection device 44 is controlled to further reduce the brightness of the output light beam.
In order to achieve a good protection effect, the installation scheme of the ToF laser ranging sensor 421 and the camera is shown in fig. 7, the distance between the ToF laser ranging sensors 421 is 15cm, the measurement angle is 25 °, the shooting angle of the camera is 130 °, and the camera can cover the range above the ToF laser ranging sensors 421 on two sides by more than 7 cm.
The current scene image is a color image, and the image sensor 441 is further configured to set the size of the current scene image to a preset size, obtain a target image, convert the target image into a grayscale image, perform histogram equalization, and perform face detection on the target image after the histogram equalization.
The embodiment provides a human eye protection projection system 40 based on a ToF laser ranging sensor 421 and human face detection, which has good operation stability, can protect human eyes pertinently, can avoid misjudgment of small animals such as cats or pet dogs when the small animals pass by due to the simple use of a pyroelectric passive infrared sensor and an ultrasonic sensor, further reduces misjudgment rate, and can greatly improve the safety factor of the projection system 40 for protecting human eyes and user experience; in addition, since the face detection is performed after the ToF laser ranging sensor 421 detects the target object, the false judgment caused by the face appearing outside the detection range of the ToF laser ranging sensor 421 and within the coverage range of the camera 431 can be avoided; and misjudgment caused by the face in the projection picture and the distant face due to the fact that face detection is simply used can be avoided, and detection and control accuracy is improved.
In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of modules or units is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.
Claims (10)
1. A projection display control method, comprising:
sending a first control instruction to a distance measuring device so that the distance measuring device judges whether a target object exists in a preset detection range or not;
if the target object exists in the preset detection range, sending a second control instruction to a face detection device so that the face detection device detects whether a face exists in a projection scene;
and if the human face exists in the projection scene, sending a first brightness adjusting signal to a projection device so as to control the brightness of the projection image output by the projection device to be reduced to a safe brightness range.
2. The projection display control method according to claim 1, further comprising, before said sending the second control instruction to the face detection device:
and if the target object exists in the preset detection range, sending a second brightness adjusting signal to the projection device so as to control the brightness of the projection image output by the projection device to be reduced to a warning brightness range.
3. The projection display control method according to claim 2, wherein the sending a second brightness adjustment signal to the projection apparatus if the target object exists within the preset detection range includes:
if the target object exists in the preset detection range, acquiring a detection distance corresponding to the target object from the distance measuring device;
and judging whether the detection distance falls within a preset dangerous range, and if so, sending a second brightness adjusting signal to the projection device.
4. The projection display control method according to claim 3, characterized by further comprising:
if the detection direction of the distance measuring device faces the projection plane of the projection device, receiving the distance measured by a plurality of laser distance measuring sensors included in the distance measuring device, wherein the distance is the distance between the distance measuring sensors and the projection plane;
calculating an average of a plurality of said ranges;
if the average value is smaller than or equal to a preset value, setting the difference value between the average value and a preset buffer distance as the maximum distance of the danger range;
wherein the minimum distance of the danger range is set to zero or the preset buffer distance.
5. The projection display control method according to claim 4, further comprising, after the calculating an average value of a plurality of the range measurements:
and if the average value is larger than the preset value, setting the preset value as the maximum distance of the dangerous range.
6. The projection display control method according to claim 3, characterized by further comprising:
if the detection direction of the distance measuring device is opposite to the projection plane of the projection device, setting the maximum distance of the dangerous range as a preset value;
wherein the minimum distance of the danger range is set to zero or a preset buffer distance.
7. A projection display control apparatus comprising a memory and a processor connected to each other, wherein the memory is configured to store a computer program, which when executed by the processor, is configured to implement the projection display control method according to any one of claims 1 to 6.
8. A projection system, comprising:
the projection device is used for emitting projection light beams and forming a projection image on a projection plane;
the distance measuring device is used for judging whether a target object exists in a preset detection range or not;
the human face detection device is used for detecting whether a human face exists in the projection scene;
projection display control apparatus comprising a memory for storing a computer program for implementing the projection display control method of any one of claims 1-6 when executed by a processor and a processor.
9. The projection system of claim 8,
the distance measuring device comprises at least two laser distance measuring sensors based on flight time, the laser distance measuring sensors are arranged on the projection device, the arrangement of the laser distance measuring sensors is parallel to the projection plane of the projection device, and the distance between every two adjacent laser distance measuring sensors is smaller than the size of a preset human face.
10. The projection system of claim 8,
the human face detection device is arranged on the projection device and comprises a camera with a shooting visual angle not less than 130 degrees.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911281657.9A CN112995619A (en) | 2019-12-13 | 2019-12-13 | Projection display control method and device and projection system |
| PCT/CN2020/126543 WO2021114965A1 (en) | 2019-12-13 | 2020-11-04 | Projection display control method and device, and projection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911281657.9A CN112995619A (en) | 2019-12-13 | 2019-12-13 | Projection display control method and device and projection system |
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| CN112995619A true CN112995619A (en) | 2021-06-18 |
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| WO2023236714A1 (en) * | 2022-06-10 | 2023-12-14 | 上海丹诺西诚智能科技有限公司 | Anti-dazzle method and system for in-vehicle projection lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113794868A (en) * | 2021-09-29 | 2021-12-14 | 中国联合网络通信集团有限公司 | Projection method and system |
| CN114371825B (en) * | 2022-01-08 | 2022-12-13 | 北京布局未来教育科技有限公司 | Remote education service system based on Internet |
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| JP4269425B2 (en) * | 1999-09-03 | 2009-05-27 | ソニー株式会社 | Projector and safety device thereof |
| WO2009001274A1 (en) * | 2007-06-26 | 2008-12-31 | Philips Intellectual Property & Standards Gmbh | Laser scanning projection device with splitting element |
| CN102566220B (en) * | 2010-12-20 | 2015-11-18 | 鸿富锦精密工业（深圳）有限公司 | Projection device protective system and guard method |
| CN103576431B (en) * | 2013-11-20 | 2016-03-23 | 巴可伟视(北京)电子有限公司 | A kind of high brightness laser projector that is applied to uses on-the-spot method and system device human eye being implemented to protection |
| CN203535368U (en) * | 2013-11-20 | 2014-04-09 | 巴可伟视(北京)电子有限公司 | System device for protecting human eyes on usage site of high brightness laser projector |
| CN204633915U (en) * | 2015-05-28 | 2015-09-09 | 深圳市智歌科技有限公司 | A kind of projector with eye recognition guard system |
| CN104902200A (en) * | 2015-05-28 | 2015-09-09 | 深圳市智歌科技有限公司 | Projector with human eye recognition protection system |
| CN107426552A (en) * | 2016-05-23 | 2017-12-01 | 中兴通讯股份有限公司 | Anti-glare method and device, projector equipment |
| CN110446018A (en) * | 2018-05-02 | 2019-11-12 | 深圳吉祥星科技股份有限公司 | A kind of eye care method of smart projector, eye protector and smart projector |
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| WO2023236714A1 (en) * | 2022-06-10 | 2023-12-14 | 上海丹诺西诚智能科技有限公司 | Anti-dazzle method and system for in-vehicle projection lamp |
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