CN109991714A - Atomatic focusing method, autofocus system and projection device - Google Patents
Atomatic focusing method, autofocus system and projection device Download PDFInfo
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- CN109991714A CN109991714A CN201810003735.8A CN201810003735A CN109991714A CN 109991714 A CN109991714 A CN 109991714A CN 201810003735 A CN201810003735 A CN 201810003735A CN 109991714 A CN109991714 A CN 109991714A
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- motor
- speed
- focusing
- image
- control module
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/53—Means for automatic focusing, e.g. to compensate thermal effects
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
The present invention provides a kind of autofocus system, method and projection device, the focusing control module of autofocus system is at least two working conditions for making motor have friction speed, during adjusting focusing, focusing control module control motor operates under different working condition, and controls the switching that motor completes different working condition.Focusing is simple and fast and effective, can reduce the abrasion of motor, has good user experience.
Description
Technical field
The present invention relates to optical fields, set more particularly, to a kind of Atomatic focusing method, autofocus system and projection
It is standby.
Background technique
The focusing of camera lens is the important performance for influencing optical articles.Since the manual focus mode of transmission is inconvenient for operation,
It needs manual operation and judges whether that focusing is clear, therefore the gradually favor by market of auto-focusing scheme, it is existing automatic
Focusing scheme generallys use mobile realize of motor driving camera lens and focuses, and the speed of motor driving camera lens is at the uniform velocity in the prior art
, on the one hand, the motor starting stage, load is larger, and according at the uniform velocity operating, biggish torque can cause larger damage to motor
Consumption, is easily reduced the service life of motor, on the other hand, increases the time-consuming of camera lens auto-focusing, is also unfavorable for precision controlled motor
Drive the displacement of camera lens.
Therefore, it is really necessary to provide one kind new autofocus system, Atomatic focusing method and projection device to solve
The above problem.
Summary of the invention
The invention mainly solves the technical problem of providing a kind of Atomatic focusing method, system and projection device, focusing
It is simple and fast and effective, it can reduce the abrasion of motor, there is good user experience.
In order to solve the above technical problems, one technical scheme adopted by the invention is that: a kind of autofocus system is provided, is wrapped
It includes:
Reference picture display module, for projecting image at image to be displayed the display for realizing image；
Image pickup module, for extracting the image under current state；
Image analysis module, for analyzing the clarity for the image that image pickup module absorbs, to judge present bit
It sets and whether focuses clearly；
Focusing control module, for controlling the focal adjustment of realization system；
The autofocus system includes the motor for driving camera lens to move along its optical axis direction, and the focusing control module makes
The working condition of at least two different frequencies at motor, during adjusting focusing, the focusing control module controls horse
It is operated up under different working condition, and controls the switching that motor completes different working condition.
Preferably, the focusing control module includes the rate control module for controlling motor running frequency, is being adjusted
In focus process, the focusing control module is logical to cut the speed-raising of motor running frequency or reduction of speed completion motor different working condition
It changes.
Preferably, the focusing control module includes controlling the low speed control module and control motor height of motor low-speed running
The High-speed Control module of speed, the focusing control module is according to the locating different conditions for adjusting focusing in the low speed control module
Switch between the High-speed Control module.
In order to solve the above technical problems, another technical solution used in the present invention is: a kind of projection device is provided, including
Autofocus system as described above.
In order to solve the above technical problems, another technical solution used in the present invention is: it is a kind of as described above to provide 5.
The Atomatic focusing method of autofocus system, which is characterized in that Atomatic focusing method includes the following steps:
System initialization, and confirm the dead-center position of camera lens and the maximum distance position of camera lens；
Control motor drives camera lens to move between maximum distance position and dead-center position, in moving process, Mei Gexiang
Image should be extracted apart from by image pickup module, and analyze the clarity for extracting image by image analysis module, confirmation is most
Clear position；
Motor drives camera lens to be moved to clearest position, including control motor is switched to the state of running at high speed to clearest position
Set movement；When close to clearest position, control motor is switched to low-speed running state and is moved to clearest position completion focusing
It adjusts.
Preferably, the step of motor is moved to clearest position includes: to be firstly moved to dead-center position, then from zero point
Position is moved to maximum distance position, is then moved to clearest position from maximum distance position.
Preferably, the method that control motor is switched to the state of running at high speed are as follows: control motor progress low speed first is at the uniform velocity transported
Turn, control motor raises speed after often running to a set angle once, until motor reaches the operating of the state that runs at high speed of setting
Frequency.
Preferably, control motor drives the Shot change to the method for low-speed running state are as follows: the control every operating of motor
It raises speed after to a set angle primary, until motor reaches the operating frequency of the low-speed running state of setting.
Preferably, the set angle is 18 °, and the operating frequency for the low-speed running state that motor is set is 200Hz, motor
The operating frequency of the state that runs at high speed set is 1000Hz.
Preferably, the method for confirming clearest position is image ladder calculation method.
The beneficial effects of the present invention are: be in contrast to the prior art, the present invention provides a kind of Atomatic focusing method, is
System and projection device, the focusing control module of autofocus system is at least two work for making motor have friction speed
State, during adjusting focusing, the focusing control module control motor operates under different working condition, and controls horse
Up to the switching for completing different working condition.Focusing is simple and fast and effective, can reduce the abrasion of motor, has good user
Experience.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of autofocus system of the present invention；
Fig. 2 is the flow chart of Atomatic focusing method of the present invention；
Fig. 3 is the flow chart that motor frequency is adjusted in autofocus system of the present invention；
Fig. 4 is the structural schematic diagram of autofocus system another embodiment of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention provides a kind of Atomatic focusing method, system and projection device, solves in the prior art that focusing is inconvenient,
The problem of motor long time running is prone to wear.
Referring to Fig. 1, autofocus system of the invention includes reference picture display module 1, image pickup module 2, figure
As analysis module 3 and focusing control module 4.
Reference picture display module 1 is used to project image onto the display function that image is realized at image to be displayed, specifically
, reference picture is formed for the image projection of reference focusing picture is come out on wall or shadow cloth by ray machine.With reference to figure
As taking pictures for image pickup module to carry out apart from calculating, analysis speed and quality can specifically use simple surplus
The picture of white background or black matrix wrongly written or mispronounced character.
Image pickup module 2 is used to extract the image under current state, specifically, obtaining reference to take pictures by camera
Picture display module projects the image information shown, and the image information that will acquire passes to image analysis module 3.
Image analysis module 3 is used to analyze the clarity for the image that image pickup module 2 absorbs, to judge present bit
It sets and whether focuses clearly；Specifically in the present embodiment, image analysis module 3 uses the clear of image gradient computational algorithm image
Degree, judges the clearest position of image.
Focusing control module 4 is for integrating reference picture display module 1, image pickup module 2 and image analysis module 3 simultaneously
Control the focal adjustment of realization system.
Focusing control module 4 has at least two working conditions for making motor be in different frequency, in the mistake for adjusting focusing
Cheng Zhong, focusing control module 4 control motor and operate under different working condition, and control motor and complete cutting for different working condition
It changes.
Focusing control module 4 includes the rate control module 41 for controlling motor running frequency, is adjusting focus process
In, the focusing control module 4 is completed to switch the state for the different phase for adjusting focusing by changing motor running frequency.?
In present embodiment, rate control module 41 only one, rate control module 41 both can by motor speed-raising make camera lens
Into the state of running at high speed；The Shot change in the state that runs at high speed can also be made to low-speed running state by reduction of speed.
Specifically, speed-raising rule is that rate control module 41 controls each angle of operation of motor more than or equal to a set angle
Then speed-raising once improves always to the state that runs at high speed of setpoint frequency C ° of degree；Corresponding, reduction of speed rule is rate control module
It is low to setpoint frequency that the 41 control each angle of operation of motor are greater than or equal to C ° of the set angle reduction of speed always that then slows down once
Fast operating condition.Specifically in the present embodiment, set angle C is 18 °, the operating frequency of the low-speed running state of motor setting
For 200Hz, the operating frequency for state that motor was set run at high speed is 1000Hz.Under low-speed running state, 1 step motor turns
Angle is 9 °.
In actual application, motor just starts the big torsion of starting needs, allows motor to be fixed on 200Hz progress low speed even
Speed operating, could drive camera lens mobile, then every time by having turned angle more than or equal to 18 °, raise speed once, successively allow horse
It is operated up to gradually speed-raising to 1000Hz, needs to slow down to motor when will be close to terminal, and the angle turned is often greater than
Or be equal to 18 ° and slow down once, gradually decelerating to motor running frequency is 200Hz, and gradually the reason of deceleration is because of each horse
Up to when close to stopping and starting initial, motor all needs to be in low speed fixed frequency and is in the present embodiment
200Hz, in this way, can prevent motor from stopping suddenly in high-speed cruising and cause motor runaways.
It should be noted that motor depends primarily on frictional force between nut and motor screw rod from low speed is reduced at a high speed, friction
The size of power depends on coefficient of friction, it is assumed that coefficient of friction μ, then motor needs to reduce speed distance S=V*V/2g μ (g=
9.8m/s2), namely " will approach " need to meet distance S, i.e., apart from terminal there are also S apart from when, motor is gradually subtracted
Speed is to 200Hz.
As shown in Fig. 2, Atomatic focusing method of the present invention, includes the following steps:
System initialization, initialized reference image display 1, image pickup module 2, image analysis module 3, focusing control
The elements such as molding block 4 and camera, motor form reference picture by reference to the projection of display module 1.
Confirm camera lens dead-center position and camera lens maximum distance position, between dead-center position and maximum distance position away from
It is 152 steps, i.e. 152 motor pulses specifically in the present embodiment from the removable stroke distances M for camera lens；
Focusing control module 4 controls motor and camera lens is driven to be moved to dead-center position from maximum distance position, in moving process
In, every respective distance, such as 1 step of every movement or 2 steps, is taken pictures by the camera of image pickup module and obtain extraction figure
Picture, and the clarity for extracting image is analyzed by image analysis module, confirm clearest position N.Specifically in the present embodiment,
The method for confirming clearest position is image ladder calculation method.
Motor drives camera lens to be moved to clearest position N, including control motor is switched to the state of running at high speed to clearest
Position is mobile；When close to clearest position, i.e., the distance S apart from clearest position meets S=V*V/2g μ, and control motor is cut
It changes to low-speed running state and is moved to clearest position completion focal adjustment.
Specifically in the present embodiment, it includes that camera lens first is moved to that motor, which drives camera lens to be moved to clearest position step,
Then dead-center position, then be moved to maximum distance position M from dead-center position is moved to zero point from distance M, in above-mentioned moving process
Speed carry out the adjustment of corresponding reduction of speed or speed-raising, specifically please refer to associated description above, details are not described herein.Preferably,
It include motor frequency adjustment process as shown in Figure 3 in above-mentioned moving process each time, that is, initialization motor first
And make motor state operating at low speed, speed-raising program is subsequently entered, i.e. rate control module 41 controls motor and transports every time
Gyration then raises speed more than or equal to C ° of a set angle and once improves always to the state that runs at high speed of setpoint frequency；Work as focusing
Control module 4, which detects, to be met S=V*V/2g μ close to mobile terminal, i.e. the distance S apart from terminal, then start reduction of speed journey
Sequence, i.e. rate control module 41 the control each angle of operation of motor then slow down one time one more than or equal to C ° of a set angle to land vertically
Speed to setpoint frequency low-speed running state.
It is the another embodiment of autofocus system of the present invention referring to shown in Fig. 4, present embodiment is above-mentioned
The improvement carried out on the basis of autofocus system, roughly the same with aforementioned embodiments, autofocus system includes with reference to figure
As display module 1, image pickup module 2, image analysis module 3 and focusing control module 4, difference is only that, in this embodiment party
In formula, rate control module altogether there are two, including control motor low-speed running low speed control module 411 and control motor high speed
The High-speed Control module 412 of operating, focusing control module 4 according to the locating different conditions for adjusting focusing in low speed control module and
Switch between High-speed Control module, to realize speed-raising or the reduction of speed of motor.
The present invention also provides a kind of projection devices comprising autofocus system as described above, it is automatic right to may be implemented
It is time-consuming to reduce focusing for coke, while focusing precisely, improves life of product, and easy to use, unfailing performance is high.
The beneficial effects of the present invention are: be in contrast to the prior art, the present invention provides a kind of autofocus system, side
Method and projection device, the focusing control module of autofocus system is at least two work shapes for making motor have friction speed
State, during adjusting focusing, the focusing control module control motor operates under different working condition, and controls motor
Complete the switching of different working condition.Focusing is simple and fast and effective, can reduce the abrasion of motor, has good user's body
It tests.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of autofocus system, comprising:
Reference picture display module, for projecting image at image to be displayed the display for realizing image；
Image pickup module, for extracting the image under current state；
Image analysis module, for analyzing the clarity for the image that image pickup module absorbs, to judge that current location is
No focusing is clear；
Focusing control module, for controlling the focal adjustment of realization system；
It is characterized in that, the autofocus system includes the motor for driving camera lens to move along its optical axis direction, the focusing control
Molding block makes motor be in the working condition of at least two different frequencies, and during adjusting focusing, the focusing controls mould
Block control motor operates under different working condition, and controls the switching that motor completes different working condition.
2. autofocus system according to claim 1, which is characterized in that the focusing control module includes for controlling
The rate control module of motor running frequency, in adjusting focus process, the focusing control module is logical to motor running frequency
Speed-raising or reduction of speed complete motor different working condition switching.
3. autofocus system according to claim 1, which is characterized in that the focusing control module includes control motor
The High-speed Control module that the low speed control module and control motor of low-speed running run at high speed, the focusing control module is according to institute
The different conditions that place adjusts focusing switch between the low speed control module and the High-speed Control module.
4. a kind of projection device, which is characterized in that including the autofocus system as described in claims 1 to 3 any one.
5. a kind of Atomatic focusing method, which is characterized in that using the auto-focusing system as described in claims 1 to 3 any one
System, Atomatic focusing method include the following steps:
System initialization confirms the dead-center position of camera lens and the maximum distance position of camera lens；
Control motor drive camera lens moved between maximum distance position and dead-center position, in moving process, every accordingly away from
Image is extracted from by image pickup module, and analyzes the clarity for extracting image by image analysis module, is confirmed clearest
Position；
Motor drives camera lens to be moved to clearest position, including control motor is switched to the state of running at high speed and moves to clearest position
It is dynamic；When close to clearest position, control motor is switched to low-speed running state and is moved to clearest position completion focal adjustment.
6. Atomatic focusing method according to claim 5, which is characterized in that the motor drives the camera lens to be moved to most
The step of clear position includes: to be firstly moved to dead-center position, then be moved to maximum distance position from dead-center position, then from most
Remote position is moved to clearest position.
7. Atomatic focusing method according to claim 5, which is characterized in that control motor is switched to the state of running at high speed
Method are as follows: control motor progress low speed first at the uniform velocity operates, and control motor raises speed once after often running to a set angle, until
Motor reaches the operating frequency of the state that runs at high speed of setting.
8. Atomatic focusing method according to claim 7, which is characterized in that control motor is switched to low-speed running state
Method are as follows: control motor raises speed after often running to a set angle once, until motor reaches the low-speed running state of setting
Operating frequency.
9. Atomatic focusing method according to claim 8, which is characterized in that the set angle is 18 °, motor setting
The operating frequency of low-speed running state is 200Hz, and the operating frequency for state that motor was set run at high speed is 1000Hz.
10. Atomatic focusing method according to claim 5, which is characterized in that the method for confirming clearest position is image
Ladder calculation method.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810003735.8A CN109991714A (en) | 2018-01-03 | 2018-01-03 | Atomatic focusing method, autofocus system and projection device |
| PCT/CN2018/080871 WO2019134263A1 (en) | 2018-01-03 | 2018-03-28 | Auto-focus method, auto-focus system, and projection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810003735.8A CN109991714A (en) | 2018-01-03 | 2018-01-03 | Atomatic focusing method, autofocus system and projection device |
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| CN109991714A true CN109991714A (en) | 2019-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810003735.8A Pending CN109991714A (en) | 2018-01-03 | 2018-01-03 | Atomatic focusing method, autofocus system and projection device |
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| Country | Link |
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| CN (1) | CN109991714A (en) |
| WO (1) | WO2019134263A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111679541A (en) * | 2020-07-16 | 2020-09-18 | 歌尔光学科技有限公司 | Calibration control method and system for projection module, storage medium and control device |
| CN112925159A (en) * | 2021-02-03 | 2021-06-08 | 深圳市兄弟盟科技有限公司 | Projection device with improved focal length adjusting structure and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117714878A (en) * | 2023-08-11 | 2024-03-15 | 荣耀终端有限公司 | Shooting method, electronic device and readable medium |
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| JP4046276B2 (en) * | 2002-10-24 | 2008-02-13 | 富士フイルム株式会社 | Digital camera |
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| WO2019134263A1 (en) | 2019-07-11 |
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Application publication date: 20190709 |