CN105959659A - Method for realizing projector adaptive adjustment and projector - Google Patents
Method for realizing projector adaptive adjustment and projector Download PDFInfo
- Publication number
- CN105959659A CN105959659A CN201610274751.1A CN201610274751A CN105959659A CN 105959659 A CN105959659 A CN 105959659A CN 201610274751 A CN201610274751 A CN 201610274751A CN 105959659 A CN105959659 A CN 105959659A
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- projector
- human body
- projection
- module
- stop
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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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/16—Human faces, e.g. facial parts, sketches or expressions
- G06V40/161—Detection; Localisation; Normalisation
- G06V40/166—Detection; Localisation; Normalisation using acquisition arrangements
-
- 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]
- H04N9/3179—Video signal processing therefor
Abstract
The invention discloses a method for realizing projector adaptive adjustment and a projector, and the method comprises the steps: in a process of projecting from the projector to a projection screen, if a block human body exists in the projection direction of a projection lens of the projector is detected; if yes, the projector is closed or the brightness of the projection ray of the projector is adjusted to a preset brightness. According to the above way, the method can realize the adaptive adjustment of the projector according to the block human body in the projection direction of the projection lens, and the projection ray of the projector burning the eyes of the block human body can be avoided.
Description
Technical field
The present invention relates to projection art, particularly relate to one and realize projector self-adaptative adjustment
Method and projector.
Background technology
Projector, be a kind of can be by the equipment on image or VIDEO PROJECTION to projection screen, it is thrown
Shadow to the image on projection screen or video present in the case of keeping definition several times or
Decades of times is amplified, and is convenient for people to viewing, also gives the visual field that people are open, therefore, projection
Instrument is welcome by user deeply.
At present, projector the place such as has been not limited in office, cinema and conference hall and has used,
Projector comes in family, and father and mother pass through projector education content, and child is by viewing
Education content on projection screen obtains knowledge.In order to education content clearly being projected to projection screen
On curtain, projector needs to export high light when projection.If eyes are just to high light, high light can be burnt eye
The child of eyeball, especially 2 years old to 6 years old, owing to it grows not yet ripe, if strong illumination child
Eyes, eyes permanent damage can be caused.And in prior art projector and be not provided with protect
The mechanism that care of young injures from high light, only relying on tutorial supervision, to be very difficult to avoid completely child remote
From projector, therefore, in the urgent need to occur being provided with protection child from high light injure machine-processed
Projector.
Summary of the invention
The technical problem that present invention mainly solves is to provide a kind of projector self-adaptative adjustment of realizing
Method and projector, it is possible to realizing projector can be according to the stop people of the projecting direction of projection lens
Body carries out self-adaptative adjustment, it is to avoid projection ray's burn of projector stops the eyes of human body.
For solving above-mentioned technical problem, the technical scheme that the present invention uses is: provide a kind of real
The method of existing projector self-adaptative adjustment, including: the mistake projected to projection screen at described projector
Cheng Zhong, whether detection exists stop human body on the projecting direction of the projection lens of described projector；
If there is described stop human body, described projector is made to close or by the projection ray of described projector
Brightness be adjusted to predetermined luminance.
Wherein, whether described detection exists the step stopping human body on the projecting direction of described projector
Suddenly include: by image collecting device, gather the image of described projection screen position；According to
Preset human bioequivalence algorithm, and combine described image, identify the projecting direction at described projector
On whether there is stop human body.
Wherein, described projector is made to close or be adjusted to by the projection brightness of described projector described
Before the step of predetermined luminance, described method also includes: according to default contours extract algorithm, from institute
State the human body contour outline extracting described stop human body in image；According to described human body contour outline, identify described
Stop the facial orientation of human body；Judge whether described facial orientation is towards projector；The most then
Make described projector close described in entrance or the projection brightness of described projector be adjusted to predetermined bright
The step of degree.
Wherein, described method also includes: if it is not, send described stop human body to block described projector
The prompting message of projection ray.
Wherein, described method also includes: whether the projecting direction continuing to detect described projector exists
Stop human body；If there is described stop human body, described projector is made to remain turned-off or make described throwing
The brightness of the projection ray of shadow instrument keeps predetermined luminance, and returns the described continuation described projection of detection
Whether the projecting direction of instrument exists the step stopping human body；If there is not described stop human body, make institute
State projector restart or the brightness of the projection ray of described projector is pulled back to former brightness.
For solving above-mentioned technical problem, another technical solution used in the present invention is: provide one
Projector, including: projection screen；Projection module, for projecting to described projection screen；First
Detection module, is used at described projection module during projection screen projects, and detection is described
Stop human body whether is there is on the projecting direction of the projection lens of projection module；Control module, is used for
When described first detection module detects the presence of described stop human body, control described projection module and close
Close or the brightness of the projection ray of described projection module is adjusted to predetermined luminance.
Wherein, described detection module includes: image collecting device, is used for gathering described projection screen
The image of position；Human bioequivalence device, presets human bioequivalence algorithm for basis, and combines
Described image, identifies whether there is stop human body on the projecting direction of described projector.
Wherein, described projector also includes: extraction module, for described human bioequivalence device identification
When there is stop human body on the projecting direction at described projector, calculate according to default contours extract
Method, extracts the human body contour outline of described stop human body from described image；Face recognition module, is used for
According to described human body contour outline, identify the facial orientation of described stop human body；Judge module, is used for sentencing
Whether disconnected described facial orientation is towards projector, determines described face court at described judge module
In time being directed towards projector, enter described control module.
Wherein, described device also includes: reminding module, for determining institute at described judge module
State facial orientation when not being directed towards projector, send described stop human body and block the throwing of described projector
The prompting message of shadow light.
Wherein, described projector also includes: the second detection module；Described second detection module, uses
Stop human body whether is there is in the projecting direction continuing to detect described projector；Described control module,
It is additionally operable to: when described second detection module detects the presence of described stop human body, make described projection
Instrument remains turned-off or makes the brightness of the projection ray of described projector to keep predetermined luminance, and returns
Described second detection module, detects at described second detection module and there is not described stop human body,
Make described projector restart or the brightness of the projection ray of described projector is pulled back to former
Brightness.
The invention has the beneficial effects as follows: being different from the situation of prior art, present invention detection is in projection
Whether there is stop human body on the projecting direction of the projection lens of instrument, stopping human body if existing, making throwing
Shadow instrument cuts out or the brightness of the projection ray of projector is adjusted to predetermined luminance, it is to avoid projector
Projection ray's burn stops the eyes of human body, it is achieved projector can be according to the projection side of projection lens
Stop human body upwards carries out self-adaptative adjustment.
Accompanying drawing explanation
Fig. 1 is the flow chart that the present invention realizes method first embodiment of projector self-adaptative adjustment；
Fig. 2 is that the present invention realizes detecting in method first embodiment of projector self-adaptative adjustment
The flow chart stopping human body whether is there is on the projecting direction of the projection lens of projector；
Fig. 3 is the flow chart that the present invention realizes method second embodiment of projector self-adaptative adjustment；
Fig. 4 is the flow chart that the present invention realizes method the 3rd embodiment of projector self-adaptative adjustment；
Fig. 5 is the schematic diagram of projector the first embodiment of the present invention；
Fig. 6 is the schematic diagram of projector the second embodiment of the present invention.
Detailed description of the invention
The present invention is described in detail with embodiment below in conjunction with the accompanying drawings.
Refer to Fig. 1, it is achieved the method for projector self-adaptative adjustment includes:
Step S201: at projector during projection screen projects, detects the throwing at projector
Whether there is stop human body on the projecting direction of shadow camera lens, stopping human body if existing, otherwise returning step
Rapid S201；
Clearly visible in order to make projection lens projects arrive the projected picture of projection screen, projection lens leads to
Often inputting stronger projection ray, when human eye is just to strong projection ray, strong projection ray easily burns
Dead person's eye.
Step S202: make projector close or be adjusted to make a reservation for by the brightness of the projection ray of projector
Brightness；
Whether there is stop human body by the projecting direction of detection projection lens, stopping people if existing
Body, then close projector, or the brightness of the projection ray of projector be adjusted to predetermined luminance, from
And avoiding the situation of projection ray's burn human eye, especially child, projection ray is had innately by child
Curiosity, but child is not aware that it is shot wounded evil by projection ray certainly, and child likes direct front to see
See projection ray, if projector is not automatically switched off or by uncomfortable for the brightness of the projection ray of projector
To predetermined luminance, the eyeball eye of the child that the most easily burns.
When stopping that human body is positioned at the projecting direction of projection lens, stop that people knows from experience stop projection ray,
Thus form shadow at projection screen, therefore, it can the detection by the shadow to projection screen,
Judge whether to exist on the projecting direction of projection lens stop human body, refer to Fig. 2, step S201
Include again:
Step S2011: by image collecting device, the image of acquired projections screen position；
Owing to image collecting device is the image of acquired projections screen position, therefore, image is adopted
The image that acquisition means is collected includes projected picture, stops that human body is formed on the projection screen
Shadow also can be in the image that image collecting device is collected.
Step S2012: according to default human bioequivalence algorithm, and combine image, identifies in projection
Stop human body whether is there is on the projecting direction of instrument；
Identify that whether there is stop human body on the projecting direction of projector mainly identifies in image
Whether there is shadow, and, the shape of shadow is the most humanoid.Certainly, embodiment party is substituted at other
In formula, it is also possible to gather whether other method identification exists stop on the projecting direction of projection lens
Human body, such as: whether exist on the projecting direction by human body infrared induction apparatus sensing projection lens
Stop human body.
Further, when there is stop human body on the projecting direction recognizing projection lens, also may be used
With identify stop human body facial orientation, when stop human body towards projector, just closedown projector or
Person adjusts the brightness of the projection ray of projector, refers to Fig. 3, and method also includes:
Step S203: according to default contours extract algorithm, extract the human body stopping human body from image
Profile；
When stopping that the side of human body, front or the back side, towards projector, stop what human body was presented
Profile differs, and therefore, it can by stopping the profile that human body is presented, it is judged that stop people
The face that body is current towards.
Step S204: according to human body contour outline, identify the facial orientation stopping human body；
Facial orientation includes towards projector, rear projection instrument and side projection instrument, and towards projection
Instrument refer to face just to projector, rear projection instrument refers to that face is back to projector, side projection instrument
Refer to face side projection instrument.
Step S205: judge whether facial orientation is towards projector, the most then enter step
S202, otherwise enters step S206；
When face is just to projector, stop that the eyes of human body, just to projector, stop the eye of human body
Eyeball is maximum by the injury of projection ray, needs to be adjusted projector, and rear projection instrument and
Side projection instrument, stops that the eyeball eye of human body is fewer by the injury of projection ray, can not adjust,
Send alarm.
Step S206: send the prompting message of the projection ray stopping that human body blocks projector；
Prompting message is for pointing out the projection ray stopping that human body has currently blocked projector, and impact is thrown
Shadow.In the present embodiment, prompting message can present with the form of sound, word or picture.
Referring to Fig. 4, Fig. 4 is method the 3rd embodiment party that the present invention realizes that projector oneself adjusts
The flow chart of formula, it is achieved method the 3rd embodiment and first and second that projector oneself adjusts is implemented
Mode difference is:
After the brightness of projector closedown or the projection ray of projector is adjusted to predetermined luminance, also may be used
To hold whether the detection that continues exists stop human body, if not on the projecting direction of the projection lens of projector
In the presence of, recover the state of projector, concrete, method also includes:
Step S207: whether the projecting direction continuing to detect described projector exists stop human body, if
Exist, then enter step S208, otherwise enter step S209；
Step S208: make projector remain turned-off or make projector projection ray brightness keep
Predetermined luminance, and return step S207；
Step S209: make projector restart or the brightness of the projection ray of projector is adjusted back
To former brightness；
When there is not stop human body on the projecting direction of the projection lens of projector, projector is again
Start or the brightness of the projection ray of projector is pulled back to former brightness, proceeding projection.
In embodiments of the present invention, detection on the projecting direction of the projection lens of projector whether
Existing and stop human body, stopping human body if existing, make projector close or by the projected light of projector
The brightness of line is adjusted to predetermined luminance, it is to avoid projection ray's burn of projector stops the eyes of human body,
Realize projector and can carry out self-adaptative adjustment according to the stop human body of the projecting direction of projection lens.
The present invention provides projector embodiment.Referring to Fig. 5, projector 30 includes projection screen
31, projection module 32, first detection module 33 and control module 34.
Projection module 32, for projecting to projection screen 31.First detection module 33, is used for
Projection module 32, during projection screen 31 projects, detects the projection at projection module 32
Stop human body whether is there is on the projecting direction of camera lens.Control module 34, for detecting mould first
When block 33 detects the presence of stop human body, control projection module 32 and close or by projection module 32
The brightness of projection ray be adjusted to predetermined luminance.
Whether there is stop human body on projecting direction by detection projection lens, stopping people if existing
Body, then close projector 30, or the brightness of the projection ray of projector 30 be adjusted to predetermined bright
Degree, thus avoid the situation of projection ray's burn human eye.
Concrete, when stopping that human body is positioned at the projecting direction of projection lens, stop that people knows from experience stop and throws
Shadow light, thus form shadow at projection screen 31, therefore, it can by projection screen 31
The detection of shadow, it is judged that whether there is stop human body on the projecting direction of projection lens, refer to
Fig. 6, first detection module 33 includes image collecting device 331 and human bioequivalence device 332.Figure
As harvester 331, for the image of acquired projections screen 31 position.Human bioequivalence device
332, preset human bioequivalence algorithm for basis, and combine image, identify the throwing at projector 30
Stop human body whether is there is on shadow direction.
Further, when face is just to projector 30, stop human body eyes just to projector 30,
Stop that the eyes of human body are maximum by the injury of projection ray, need projector 30 is adjusted,
And rear projection instrument 30 and side projection instrument 30, stop that the eyeball eye of human body is hindered by projection ray
Evil is fewer, can not adjust, send alarm.Projector also includes that extraction module 35, face are known
Other module 36, judge module 37 and reminding module 38.
Extraction module 35, recognizes in the projection side of projector 30 for human bioequivalence device 332
When upwards there is stop human body, according to default contours extract algorithm, extract from image and stop human body
Human body contour outline.Face recognition module 36, for according to human body contour outline, identifying the people stopping human body
Face towards.Judge module 37, is used for judging whether facial orientation is towards projector 30, is sentencing
Disconnected module 37 determines facial orientation when being directed towards projector 30, enters control module 34.Prompting
Module 38, for judge module 37 determine facial orientation be not directed towards projector 30 time, send out
Go out to stop that human body blocks the prompting message of the projection ray of projector 30.
Projector 30 also includes: the second detection module 39.Second detection module 39, is used for continuing
Whether the projecting direction of detection projector 30 exists stop human body.Control module 34, is additionally operable to:
When the second detection module detects the presence of stop human body, projector 30 is made to remain turned-off or make
The brightness of the projection ray of projector 30 keeps predetermined luminance, and returns the second detection module,
Second detection module detects and there is not stop human body, makes projector 30 restart or will throw
The brightness of the projection ray of shadow instrument 30 pulls back to former brightness.
In embodiments of the present invention, first detection module 33 is for detecting the projection at projector
Whether there is stop human body on the projecting direction of camera lens, control module 34 is for detecting mould first
Block 33 detects the presence of stop human body, makes projector close or by the projection ray of projector
Brightness is adjusted to predetermined luminance, it is to avoid projection ray's burn of projector stops the eyes of human body, it is achieved
Projector can carry out self-adaptative adjustment according to the stop human body of the projecting direction of projection lens.
The foregoing is only embodiments of the present invention, not thereby limit the patent model of the present invention
Enclosing, every equivalent structure utilizing description of the invention and accompanying drawing content to be made or equivalence flow process become
Change, or be directly or indirectly used in other relevant technical fields, be the most in like manner included in the present invention's
In scope of patent protection.
Claims (10)
1. the method realizing projector self-adaptative adjustment, it is characterised in that including:
At described projector during projection screen projects, detect the projection at described projector
Stop human body whether is there is on the projecting direction of camera lens；
If there is described stop human body, described projector is made to close or by the projection of described projector
The brightness of light is adjusted to predetermined luminance.
Method the most according to claim 1, it is characterised in that
Whether described detection exists the step bag stopping human body on the projecting direction of described projector
Include:
By image collecting device, gather the image of described projection screen position；
According to default human bioequivalence algorithm, and combine described image, identify at described projector
Stop human body whether is there is on projecting direction.
Method the most according to claim 2, it is characterised in that
Described projector is made to close or be adjusted to make a reservation for by the projection brightness of described projector described
Before the step of brightness, described method also includes:
According to default contours extract algorithm, from described image, extract the human body wheel of described stop human body
Wide；
According to described human body contour outline, identify the facial orientation of described stop human body；
Judge whether described facial orientation is towards projector；
Described projector is made to close or by the projection brightness of described projector described in the most then entering
It is adjusted to the step of predetermined luminance.
Method the most according to claim 3, it is characterised in that described method also includes:
If it is not, send the prompting message that described stop human body blocks the projection ray of described projector.
Method the most according to claim 1, it is characterised in that described method also includes:
Whether the projecting direction continuing to detect described projector exists stop human body；
If there is described stop human body, described projector is made to remain turned-off or make described projector
The brightness of projection ray keeps predetermined luminance, and returns the described throwing continuing to detect described projector
Whether shadow direction exists the step stopping human body；
If there is not described stop human body, described projector is made to restart or by described projector
The brightness of projection ray pull back to former brightness.
6. a projector, it is characterised in that including:
Projection screen；
Projection module, for projecting to described projection screen；
First detection module, is used at described projection module during projection screen projects, inspection
Survey on the projecting direction of the projection lens of described projection module, whether there is stop human body；
Control module, is used for when described first detection module detects the presence of described stop human body,
Control described projection module close or be adjusted to pre-by the brightness of the projection ray of described projection module
Determine brightness.
Projector the most according to claim 6, it is characterised in that
Described detection module includes:
Image collecting device, for gathering the image of described projection screen position；
Human bioequivalence device, presets human bioequivalence algorithm for basis, and combines described image, knows
On the projecting direction of described projector, whether there is not stop human body.
Projector the most according to claim 7, it is characterised in that described projector also includes:
Extraction module, recognizes the projecting direction at described projector for described human bioequivalence device
When upper existence stops human body, according to default contours extract algorithm, from described image, extract described resistance
The human body contour outline of gear human body；
Face recognition module, for according to described human body contour outline, identifies the face of described stop human body
Towards；
Judge module, is used for judging whether described facial orientation is towards projector, in described judgement
Module determines described facial orientation when being directed towards projector, enters described control module.
Projector the most according to claim 8, it is characterised in that described device also includes:
Reminding module, is not directed towards projection for determining described facial orientation at described judge module
During instrument, send the prompting message that described stop human body blocks the projection ray of described projector.
Projector the most according to claim 6, it is characterised in that described projector also includes:
Second detection module；
Described second detection module, for continuing to detect whether the projecting direction of described projector exists
Stop human body；
Described control module, is additionally operable to:
When described second detection module detects the presence of described stop human body, described projector is made to protect
The brightness holding the projection ray closing or making described projector keeps predetermined luminance, and returns described
Second detection module,
Detect at described second detection module and there is not described stop human body, make described projector weight
Newly start or the brightness of the projection ray of described projector is pulled back to former brightness.
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| CN201610274751.1A CN105959659A (en) | 2016-04-28 | 2016-04-28 | Method for realizing projector adaptive adjustment and projector |
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| CN201610274751.1A CN105959659A (en) | 2016-04-28 | 2016-04-28 | Method for realizing projector adaptive adjustment and projector |
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| CN107295320A (en) * | 2017-08-07 | 2017-10-24 | 上海青橙实业有限公司 | The control method and device of projection terminal |
| CN108124144A (en) * | 2016-11-29 | 2018-06-05 | 中兴通讯股份有限公司 | A kind of method for controlling projection and device |
| CN108281100A (en) * | 2018-01-16 | 2018-07-13 | 歌尔股份有限公司 | Laser-projector control method, equipment and laser-projector |
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| CN107295320A (en) * | 2017-08-07 | 2017-10-24 | 上海青橙实业有限公司 | The control method and device of projection terminal |
| CN108281100A (en) * | 2018-01-16 | 2018-07-13 | 歌尔股份有限公司 | Laser-projector control method, equipment and laser-projector |
| CN108490629A (en) * | 2018-03-12 | 2018-09-04 | 广东欧珀移动通信有限公司 | Structured light projector and its detection method and device, image acquiring device and electronic equipment |
| CN108508620A (en) * | 2018-03-12 | 2018-09-07 | 广东欧珀移动通信有限公司 | Detection method, detection device and the electronic device of laser projection module |
| CN108508620B (en) * | 2018-03-12 | 2020-03-06 | Oppo广东移动通信有限公司 | Detection method and detection device of laser projection module and electronic device |
| US11563930B2 (en) | 2018-03-12 | 2023-01-24 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Laser projection component, detection method thereof, and electronic device |
| US11348217B2 (en) | 2018-03-12 | 2022-05-31 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Projector, detection method thereof, and electronic device |
| 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 |
| US10687035B2 (en) | 2018-09-25 | 2020-06-16 | Asustek Computer Inc. | Projection method and projection system |
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| CN109803132A (en) * | 2018-12-20 | 2019-05-24 | 合肥凌极西雅电子科技有限公司 | A kind of projection device hommization intelligence control system and method |
| CN109756765B (en) * | 2018-12-20 | 2021-01-29 | 合肥凌极西雅电子科技有限公司 | Intelligent control method based on portable projection equipment |
| CN109756765A (en) * | 2018-12-20 | 2019-05-14 | 合肥凌极西雅电子科技有限公司 | A kind of intelligent control method based on portable translucent equipment |
| US11829057B2 (en) | 2019-06-20 | 2023-11-28 | Hisense Laser Display Co., Ltd | Projection method and projection apparatus |
| CN114745530A (en) * | 2019-06-20 | 2022-07-12 | 青岛海信激光显示股份有限公司 | Projection method and device |
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| CN111225197A (en) * | 2019-11-28 | 2020-06-02 | 歌尔股份有限公司 | Projection method, device, equipment and readable storage medium |
| CN111126300A (en) * | 2019-12-25 | 2020-05-08 | 成都极米科技股份有限公司 | Human body image detection method and device, electronic equipment and readable storage medium |
| CN111126300B (en) * | 2019-12-25 | 2023-09-08 | 成都极米科技股份有限公司 | Human body image detection method and device, electronic equipment and readable storage medium |
| WO2021139502A1 (en) * | 2020-01-08 | 2021-07-15 | 深圳光峰科技股份有限公司 | Human eye protection method for projector, and projector |
| CN111935470A (en) * | 2020-09-27 | 2020-11-13 | 深圳市当智科技有限公司 | Projector and optical machine control method thereof |
| CN111935470B (en) * | 2020-09-27 | 2021-03-26 | 深圳市当智科技有限公司 | Projector and optical machine control method thereof |
| WO2022222193A1 (en) * | 2021-04-22 | 2022-10-27 | 深圳市远古科技有限公司 | Projector and system for accurately identifying obstruction and starting up protection |
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