CN110532750A - System and method based on time-of-flight method 3D modeling technology prevention and control child myopia - Google Patents
System and method based on time-of-flight method 3D modeling technology prevention and control child myopia Download PDFInfo
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- CN110532750A CN110532750A CN201910827392.1A CN201910827392A CN110532750A CN 110532750 A CN110532750 A CN 110532750A CN 201910827392 A CN201910827392 A CN 201910827392A CN 110532750 A CN110532750 A CN 110532750A
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- 238000002366 time-of-flight method Methods 0.000 title claims abstract description 31
- 208000001491 myopia Diseases 0.000 title claims abstract description 17
- 230000004379 myopia Effects 0.000 title claims abstract description 16
- 230000002265 prevention Effects 0.000 title claims abstract description 16
- 238000005516 engineering process Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 230000008859 change Effects 0.000 claims abstract description 5
- 238000012545 processing Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 238000005286 illumination Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 3
- 235000013399 edible fruits Nutrition 0.000 claims description 2
- 239000000284 extract Substances 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 206010057855 Hypotelorism of orbit Diseases 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 208000010877 cognitive disease Diseases 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002650 habitual effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011524 similarity measure Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/93—Lidar systems specially adapted for specific applications for anti-collision purposes
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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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- 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
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/82—Protecting input, output or interconnection devices
- G06F21/84—Protecting input, output or interconnection devices output devices, e.g. displays or monitors
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- Software Systems (AREA)
- General Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Measurement Of Optical Distance (AREA)
Abstract
The invention discloses a kind of system and methods based on time-of-flight method 3D modeling technology prevention and control child myopia, comprising: distance measuring unit, controller, TOF unit, face characteristic matching unit and screen backlight control module.The present invention provides advanced row distance measurement, then passes through TOF unit when being closer between discovery " user " and electronic equipment and carries out 3D modeling to " user " and export point cloud model, then the subsequent point cloud model to output is made whether the identification for face.The brightness that screen is actively reduced if when being judged as face, voluntarily restores brightness after leaving；Indicate that leaning on before screen is not face but other objects, does not change screen intensity if when being judged as non-face.
Description
Technical field
The present invention relates to a kind of system and methods based on time-of-flight method 3D modeling technology prevention and control child myopia, belong to electricity
Sub-information technical field.
Background technique
This is the distinctive scene of digital times --- come into the world with a cry with baby, just there is mobile phone and plate at one's side, long and
Long it, just at living habit.Young children is a special group, and strong imitation desire is inherent to the world
Curiosity, and still unsound control, these are all doomed, in adult things habitual in the eyes, to him
Influence may be various.
Country defends strong committee's investigation display, and national children and youth totality rate of myopia is up to 53.6% within 2018, wherein 6 years old youngster
Child is 14.5%, and pupil 36%, and junior school student 71.6%, and high school student 81%, and the near-sighted trend of becoming younger starts to show.One
Important reason is not scientifical use electronic product, is suggested simultaneously, children should avoid using electronic product within 6 years old or less.Even if
In this way, can solve problem even avoiding excessively contacting electronic product, but it is still multifarious to fall on operating level, so that finally
Effect is difficult to expect.
Go to open air, encouragement activity, similar universally applicable mode not can solve particular problem more.Nowadays, it
It is detached from ubiquitous electronic product, is that the ecosystem of child " recovering one's original simplicity " is lived, it is clear that unrealistic.Work as electronics
When product is gradually evolved into necessity for life, society, campus and family various aspects be imperceptibly influenced by what one constantly sees and hears under, children and electronic product
Association, it is impossible to accomplish the isolation in imagining.
In other words, also inevitably good if lacking enough aggregate measures even avoiding the electronic product to be pair as far as possible
The heart does bad thing.Try that young children is allowed to contact electronic product less with it, is not so good as some more reverse thinkings, neither removes demonization electronics
Product need not also weaken its intrinsic harm, more to enable children to form being accustomed to eye for health by technological means,
Young children can be allowed more to be protected under the premise of appropriateness.
Summary of the invention
Purpose: in order to overcome the deficiencies in the prior art, it is light-operated that legacy system carries out screen back by ranging merely
The method or system of system have the disadvantages that
1, accidentally control rate is high, if there are when other barriers between human eye and equipment, because it is unable to the type of cognitive disorders object,
Typically such as: distance measuring unit is because having falsely detected the user's palm (user needs to carry out touch operation to equipment by hand)
When distance is less than preset value between screen, prevention and control measure is taken actively mistakenly to reduce use feeling.Just i.e. it can
It is flat with face pattern for cooperating face recognition technology that can not accurately distinguish current barrier by two-dimensional imaging sensor
Face printed matter or real face.
2, different users cannot be identified, to can not ideally pass through the use duration and rest duration of control user
Come alleviate excess eye-using (such as there are two the above user it is alternate and continuous using electronic product when, equipment cannot detect this
Situation only can be locked or unlocked mechanically in a manner of countdown).
The present invention provides a kind of system and method based on time-of-flight method 3D modeling technology prevention and control child myopia, for setting
It sets in equipment end, active prevention and control children are caused closely because that cannot recognize in time it between electronic product using hypotelorism
Depending on system.
Technical solution: in order to solve the above technical problems, the technical solution adopted by the present invention are as follows:
A kind of system based on time-of-flight method 3D modeling technology prevention and control child myopia, comprising: distance measuring unit, controller, TOF are mono-
Member, face characteristic matching unit and screen backlight control module；
The distance measuring unit carries out range measurement to the specific object in front of screen for timing, when the spacing of specific object and screen
When from being less than setting value, distance measuring signal is sent to the controller；
The TOF unit, comprising: infrared illumination module, illuminant module, processing circuit and point cloud output module；
The face characteristic matching unit belongs to the identification of face for being made whether to the point cloud model, and identification is tied
Fruit exports to the controller；
The controller is for sending control signals to screen backlight control module；
The screen backlight control module is used for according to control Signal Regulation screen intensity.
Further, the distance measuring unit uses infrared distance measurement unit.Further, the distance measuring unit uses laser ranging list
Member.
Further, the infrared illumination module is used to emit modulated pulsed infrared light to specific object.
Further, the illuminant module includes: infrared band pass filter, camera lens, sensitive chip, the infrared bandpass filter
Piece is arranged in camera lens front, passes through for reflected light identical with wavelength of transmitted light, each pixel of the sensitive chip is used for
Constantly the specific phase between the round-trip camera and object of transmitting light is recorded respectively parallel.
Further, the processing circuit is used for by recording to each pixel, and the data recorded carry out processing and extract
Phase difference, and the depth information at the different location of specific object surface is calculated by the phasometer.
Further, specific object surface shape structure that described cloud output module is used to have 3D according to depth information output
The point cloud model made.
A method of based on time-of-flight method 3D modeling technology prevention and control child myopia, comprising the following steps:
Step 1 carries out range measurement to the specific object in front of screen by 1 timing of distance measuring unit；
Step 2, when distance is less than setting value between specific object and screen, image is carried out to the specific object by TOF unit and is adopted
Collect and carry out 3D modeling, exports the point cloud model of 3D；
Step 3, face characteristic matching unit identify point cloud model；
Step 4, when face characteristic matching unit output be face when, screen intensity is reduced to default by screen backlight control module
Value；When the output of face characteristic matching unit is non-face, screen backlight control module does not change screen intensity；
Step 5, when distance measuring unit detects between specific object and screen that distance is greater than or equal to setting value again, screen backlight
Screen intensity is reverted to user's setting value by control module.
Further, step 3 includes:
3a, the 3D manifold model for generating polygon latticed and formatting is registrated according to point cloud model；
3b, matching primitives are carried out respectively with multiple typical case's face 3D models in preset face 3D model library；
3c, finally according to matching primitives go out related coefficient judge whether the specific object belongs to face.
It further, further include step 6, it is default to use duration interval, when the use of the time being more than to use duration interval, compare
Current device is locked if the two similitude is higher than threshold value with face point cloud model that is currently establishing using preceding.
It further, further include step 7, if not up to preset cooling duration, equipment are unlocked, the certain time after unlock
It is interior, face point cloud model is established to user, and the face point cloud model established before locking with equipment is compared, and sentences if comparing
It is fixed similar, then current device is locked again, and cooling duration is double.
The utility model has the advantages that a kind of system based on time-of-flight method 3D modeling technology prevention and control child myopia provided by the invention and
Method, through the invention in system the measurement of advanced row distance, the distance between discovery " user " and electronic equipment may be implemented
Then pass through TOF unit when closer to carry out 3D modeling to " user " and export point cloud model, then the subsequent point cloud model to output into
Row whether be face identification.The brightness of screen is actively reduced if when being judged as face --- voluntarily restore bright if after leaving
Degree；Indicate that leaning on before screen is not face but other objects if when being judged as non-face --- do not change screen intensity.
It greatly improves the intelligence of equipment and uses likability.
In addition it is worth mentioning that: the system in through the invention can also be realized to the lasting control using duration.It is logical
The duration for crossing setting carries out successively acquisition twice and establishes, if it is determined that same people, then automatic locking device.It is unlocking by force
The random times in certain time section after equipment are detected, and be can be avoided user in this way and are unlocked deception by other people and set
It is standby to use duration to obtain new setting.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of this system；
Fig. 2 is distance measuring unit and TOF unit arragement construction figure.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawing.
As shown in Figs. 1-2, a kind of system based on time-of-flight method 3D modeling technology prevention and control child myopia, in the present embodiment
In based on touch screen electronic equipment (such as learning machine, mobile phone or tablet computer) realize.System include distance measuring unit 1,
Controller, TOF unit, face characteristic matching unit and screen backlight control module.Wherein,
Distance measuring unit 1 carries out range measurement to the specific object in front of screen for timing, when distance is small between specific object and screen
When setting value, distance measuring signal is sent to controller.
TOF unit 2 is exported for carrying out Image Acquisition to the specific object under the control of the controller and carrying out 3D modeling
Point cloud model with 3D meaning.
Face characteristic matching unit belongs to the identification of face for being made whether to point cloud model, and recognition result is defeated
Out to controller.
The controller is for sending control signals to screen backlight control module；
The screen backlight control module is used for according to control Signal Regulation screen intensity.
A method of based on time-of-flight method 3D modeling technology prevention and control child myopia, comprising the following steps:
Step 1 carries out range measurement to the specific object in front of screen by 1 timing of distance measuring unit.
Distance measuring unit 1 be arranged in the electronic equipment above touch screen, be preferably infrared distance measurement unit, certainly for
Different purposes and situation can be set to laser ranging unit.In user's hand-hold electronic equipments, infrared distance measurement unit is regular
Ground compartment of terrain measures immediate object in front of screen, when measuring has specific object lower than the spacing set, under
One step.
Step 2, by the abbreviation of TOF(Time of flight, translate: the flight time) unit carries out image to the specific object
3D modeling is acquired and carried out, the point cloud model having in 3D meaning is exported.TOF unit 2 can use Sharp Corp (Sharp
Microelectronics) the 852-MTOF171000C0 sensing unit exported.
Specifically, TOF unit 2 includes infrared illumination module, illuminant module, processing circuit and point cloud output module.
Infrared illumination module is suitable for emitting modulated pulsed infrared light to specific object.
Illuminant module includes infrared band pass filter, camera lens, sensitive chip, and infrared band pass filter is arranged in camera lens front
Only to pass through for reflected light identical with wavelength of transmitted light, each pixel of sensitive chip is suitable for parallel constantly to transmitting light
Specific phase between round-trip camera and object is recorded respectively.
Processing circuit is suitable for carrying out processing by the data recorded to the recording of each pixel extracting phase difference, and passes through
The phasometer calculates the depth information at the different location of specific object surface.
Point cloud output module has the point of 3D meaning constructed about the specific object surface shape according to depth information output
Cloud model.
Step 3 is made whether the point cloud model to belong to the identification of face.
When the point cloud model is matched with face characteristic, expression and the specific object of screen short distance are actually
The face of people, indirectly indicate the distance between human eye and screen already below reasonable benefit/risk at a distance from, the excessively close viewing of children is electric
Sub- equipment then easily leads to myopia.Screen intensity is reduced to by preset value by screen backlight control module at this time.The preset value can
Think 0, screen is without light when being 0, to prevent to continue to set with current sitting posture using the electronics by way of changing screen intensity
It is standby.
Specifically, when being made whether to belong to the identification of face to the point cloud model,
A, the 3D manifold model for generating polygon latticed and formatting first is registrated according to point cloud model；
B, matching primitives are carried out respectively with multiple typical case's face 3D models in preset face 3D model library again；
C, finally judge whether the specific object belongs to face according to the related coefficient that matching primitives go out.
Similarly, when the point cloud model and face characteristic mismatch, indicate that current specific object is not the face of people, and
It may be other objects (such as any possible article such as pencil or the finger of operation).Judging that specific object is not the face of people
Do not change screen intensity behind portion, in order to avoid influence the normal use of electronic equipment.
After step 3, can also include,
Step 4, luminance recovery.
After screen intensity is reduced to preset value, detected between specific object and screen again when by distance measuring unit 1
When distance is greater than or equal to setting value, screen intensity is reverted to by user's setting value by screen backlight control module.
In the present embodiment, to make the more smooth system completeness of ranging and modeling linking higher, TOF unit 2
Specific object surface shape is constructed and be acquired, is measured without the accurate distance to the specific object.For distance
Measurement transfers to distance measuring unit to carry out, to improve the acquisition speed to specific object surface 3D construction.If acquisition is not in time, have
The object that possible distance measuring unit 1 measures is the hand of user, but after skimming over because of quick-moving speed, and TOF unit 2 is relatively slow collected to be
The face of people, thus make the judgement to make mistake.
The distance measuring unit 1 enumerated in the present embodiment is infrared light or laser as working media.
In the present embodiment, (it is longest that certain children's single is set convenient for parent for the limited control using duration of realization
Persistently use duration, such as 1 hour) it can be used as preferably:
With preset duration interval (such as 1 hour 05 points, user can be prompted before last 5 minutes, 5 minutes leave for
User goes the related application for terminating to open) to divide, poured in separately at 1 hour 05 when timing starts and at the end of, successively adopt twice
Collect and set up the point cloud model about user, if this point cloud model similitude established twice is higher than threshold value, locking is worked as
Preceding equipment.
In the Similarity measures of point cloud model, overall color in first latter two point cloud model is analyzed by fuzzy algorithmic approach
Branch's trend, by comparing the correlation of Liang Ge branch Trend value.When correlation is higher than threshold value, successive pair acquired twice of judgement
As for same user.
And further it is preferably: if (intuitive table when equipment is not just unlocked after preset cooling duration
Now for the children, not after long enough cooling time, unlocker device is carried out using cooling time can be 2 hours, can also again
Think 12 hours).
So in order to prevent such case, can be used as preferably: any random in 20 minutes sections after unlock
Moment carries out third time acquisition to user and establishes point cloud model, before point cloud model and the equipment locking that third time is established most
The point cloud model once established afterwards is compared, if still compare determine it is similar, again lock current device and it is described cooling when
Long double (double or do not make any changes depending on different situations, be not limited in any way herein).
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (8)
1. a kind of system based on time-of-flight method 3D modeling technology prevention and control child myopia, it is characterised in that: include: ranging list
Member, controller, TOF unit, face characteristic matching unit and screen backlight control module；
The distance measuring unit carries out range measurement to the specific object in front of screen for timing, when the spacing of specific object and screen
When from being less than setting value, distance measuring signal is sent to the controller；
The TOF unit, comprising: infrared illumination module, illuminant module, processing circuit and point cloud output module；
The face characteristic matching unit belongs to the identification of face for being made whether to the point cloud model, and identification is tied
Fruit exports to the controller；
The controller is for sending control signals to screen backlight control module；
The screen backlight control module is used for according to control Signal Regulation screen intensity.
2. a kind of system based on time-of-flight method 3D modeling technology prevention and control child myopia according to claim 1, special
Sign is: the distance measuring unit uses infrared distance measurement unit.
3. a kind of system based on time-of-flight method 3D modeling technology prevention and control child myopia according to claim 1, special
Sign is: the distance measuring unit uses laser ranging unit.
4. a kind of system based on time-of-flight method 3D modeling technology prevention and control child myopia according to claim 1, special
Sign is: the infrared illumination module is used to emit modulated pulsed infrared light to specific object；The illuminant module includes: red
Outer bandpass filter, camera lens, sensitive chip, the infrared band pass filter are arranged in camera lens front, are used for and wavelength of transmitted light
Identical reflected light passes through, and each pixel of the sensitive chip is for parallel constantly to the round-trip camera and object of transmitting light
Between specific phase recorded respectively；The processing circuit be used for by each pixel record, the data recorded into
Row processing extracts phase difference, and calculates the depth information at the different location of specific object surface by the phasometer；The point
Cloud output module is used for the point cloud model of the specific object surface shape construction according to depth information output with 3D.
5. according to claim 1 to the preventing control method of any one of 4 systems, characterized by the following steps:
Step 1 carries out range measurement to the specific object in front of screen by 1 timing of distance measuring unit；
Step 2, when distance is less than setting value between specific object and screen, image is carried out to the specific object by TOF unit and is adopted
Collect and carry out 3D modeling, exports the point cloud model of 3D；
Step 3, face characteristic matching unit identify point cloud model；
Step 4, when face characteristic matching unit output be face when, screen intensity is reduced to default by screen backlight control module
Value；When the output of face characteristic matching unit is non-face, screen backlight control module does not change screen intensity；
Step 5, when distance measuring unit detects between specific object and screen that distance is greater than or equal to setting value again, screen backlight
Screen intensity is reverted to user's setting value by control module.
6. preventing control method according to claim 5, it is characterised in that: the step 3 includes:
3a: the 3D manifold model that polygon latticed is formatted is generated according to dense point cloud Model registration；
3b: matching primitives are carried out respectively with multiple typical case's face 3D models in preset face 3D model library；
3c: finally judge whether the specific object belongs to face according to the related coefficient that matching primitives go out.
7. preventing control method according to claim 5, it is characterised in that: further include step 6, presets and use duration interval, when
Using the time more than duration interval is used, comparison is using face point cloud model that is preceding and currently establishing, if the two similitude is higher than
When threshold value, current device is locked.
8. preventing control method according to claim 5, it is characterised in that: further include step 7, if when not up to preset cooling
Long, equipment is unlocked, and after unlock in certain time, establishes face point cloud model to user, and establish before locking with equipment
Face point cloud model be compared, determine similar if comparing, lock current device again, and cooling duration is double.
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