CN105891812A - Distance measurement method, device and terminal device - Google Patents
Distance measurement method, device and terminal device Download PDFInfo
- Publication number
- CN105891812A CN105891812A CN201510786351.4A CN201510786351A CN105891812A CN 105891812 A CN105891812 A CN 105891812A CN 201510786351 A CN201510786351 A CN 201510786351A CN 105891812 A CN105891812 A CN 105891812A
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- Prior art keywords
- photographic head
- lens
- current value
- distance
- defocused
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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
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/12—Systems for determining distance or velocity not using reflection or reradiation using electromagnetic waves other than radio waves
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Measurement Of Optical Distance (AREA)
Abstract
The invention provides a distance measurement method, a device and a terminal device. After a camera is aligned with a measured object for focusing, the lens motor drive current value of the focused camera is acquired. According to the lens motor drive current value of the focused camera, the correspondence table of the lens motor drive current value and the lens position is queried. The lens position of the corresponding focused camera is acquired. The aperture value and the lens position of the focused camera are substituted into a lens imaging formula of the lens to calculate to distance between the camera and the measured object. Distance measured by the terminal device can be expanded to the camera coverage of the terminal device. The technical problem that long distance cannot be measured by the terminal device in the prior art is solved.
Description
Technical field
The present invention relates to electronic technology, particularly relate to a kind of measure the method for distance, device and terminal
Equipment.
Background technology
Along with the development of electronic technology, prior art not only can use gage adjust the distance into
Row is measured, but also laser can be used to adjust the distance and measure, and, have also appeared for pacifying meanwhile
Being contained in the application in the terminal units such as mobile phone, this application can be by the display of terminal unit
Display gage, so that user can utilize shown gage to measure distance.
Prior art uses gage and the mode of laser distance measuring, there is problem inconvenient to carry,
The terminal units such as mobile phone are often carried with as various daily neces saries, user, use and are arranged on hands
Application in the terminal units such as machine shows gage, and then the mode measuring distance then overcomes and carries not
Just defect.But this mode, measures distance shorter, is only limitted to the length of mobile telephone display, because of
And when relatively long distance measured by needs, then cannot use.
Summary of the invention
The present invention provides a kind of and measures the method for distance, device and terminal unit, is used for solving existing
Technology cannot utilize the technical problem that longer distance is measured by terminal unit.
For reaching above-mentioned purpose, embodiments of the invention adopt the following technical scheme that
First aspect, it is provided that a kind of method measuring distance, including:
Photographic head is directed at measured object focus；
Obtain the lens motor driving current value to defocused photographic head；
According to the described lens motor driving current value to defocused photographic head, inquiry lens motor drives
Galvanic electricity flow valuve and lens location mapping table, it is thus achieved that the corresponding described mirror to defocused photographic head
Head position；Described lens location is in described photographic head in camera lens and described photographic head between sensor
Distance；
According to the described f-number to defocused photographic head and lens location, use the saturating of described camera lens
Mirror imaging formula calculates the distance obtained between described photographic head and described measured object.
Second aspect, it is provided that a kind of device measuring distance, including:
Focusing module, focuses for photographic head is directed at measured object；
Acquisition module, for obtaining the lens motor driving current value to defocused photographic head；
Enquiry module, is used for according to the described lens motor driving current value to defocused photographic head,
Inquiry lens motor driving current value and lens location mapping table, it is thus achieved that corresponding described focusing
After the lens location of photographic head；Described lens location is camera lens and described shooting in described photographic head
Distance between sensor in Tou；
Computing module, for according to the described f-number to defocused photographic head and lens location, adopts
Calculate with the lens imaging formula of described camera lens obtain between described photographic head and described measured object away from
From.
The third aspect, it is provided that a kind of terminal unit, including photographic head and as above measure away from
From device.
The method of measurement distance, device and the terminal unit that the embodiment of the present invention provides, by taking the photograph
After focusing as head alignment measured object, obtain the lens motor to defocused photographic head and drive electricity
Flow valuve, then according to the lens motor driving current value to defocused photographic head, inquires about lens motor
Driving current value and lens location mapping table, it is thus achieved that the corresponding camera lens to defocused photographic head
Position, and then by the f-number of defocused photographic head and lens location, the lens substituting into camera lens become
As formula calculates the distance obtained between photographic head and measured object, thus terminal unit can be recorded
Extended distance can be in coverage to the photographic head of terminal unit, solving cannot in prior art
Utilize the technical problem that longer distance is measured by terminal unit.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the present invention
Technological means, and can be practiced according to the content of description, and the present invention's be upper in order to allow
State and can become apparent with other objects, features and advantages, below especially exemplified by the concrete reality of the present invention
Execute mode.
Accompanying drawing explanation
By reading the detailed description of hereafter preferred implementation, various other advantage and benefit
Place will be clear from understanding for those of ordinary skill in the art.Accompanying drawing is only used for illustrating preferably
The purpose of embodiment, and it is not considered as limitation of the present invention.And at whole accompanying drawing
In, it is denoted by the same reference numerals identical parts.In the accompanying drawings:
The schematic flow sheet of a kind of method measuring distance that Fig. 1 provides for the embodiment of the present invention one；
Fig. 2 is lens imaging schematic diagram；
The structural representation of a kind of device measuring distance that Fig. 3 provides for the embodiment of the present invention two；
The structural representation of the another kind of device measuring distance that Fig. 4 provides for the embodiment of the present invention two.
Detailed description of the invention
It is more fully described the exemplary embodiment of the disclosure below with reference to accompanying drawings.Although it is attached
Figure shows the exemplary embodiment of the disclosure, it being understood, however, that can be with various shapes
Formula realizes the disclosure and should not limited by embodiments set forth here.On the contrary, it is provided that these
Embodiment is able to be best understood from the disclosure, and can be by the scope of the present disclosure
Complete conveys to those skilled in the art.
Below in conjunction with the accompanying drawings the method for distance, device and end are measured in embodiment of the present invention offer
End equipment is described in detail.
Embodiment one
The schematic flow sheet of a kind of method measuring distance that Fig. 1 provides for the embodiment of the present invention one,
As it is shown in figure 1, the method that the present embodiment is provided can be performed by terminal units such as mobile phones, this is eventually
End equipment needs equipped with photographic head, and method includes:
Step 101, photographic head is directed at measured object focuses.
Concrete, the lens motor driving current value of successive adjustment photographic head, change the mirror of photographic head
Head position, utilizes photographic head to take pictures measured object, from taking pictures under the conditions of different lens locations
In the image obtained, selecting the target image that definition is optimum, the lens motor setting photographic head drives
Galvanic electricity flow valuve is the lens motor driving current value of photographic head when obtaining target image of taking pictures.
Or, concrete, use phase place focusing (Phase Detection Auto Focus, PDAF)
Or contrast focusing mode, is directed at measured object by photographic head and focuses.
Step 102, the acquisition lens motor driving current value to defocused photographic head.
Step 103, the basis lens motor driving current value to defocused photographic head, inquire about camera lens horse
Reach driving current value and lens location mapping table, it is thus achieved that the corresponding mirror to defocused photographic head
Head position.
Wherein, distance between sensor in camera lens and photographic head during lens location is photographic head.
Step 104, according to the f-number of defocused photographic head and lens location, use the saturating of camera lens
Mirror imaging formula calculates the distance obtained between photographic head and measured object.
Concrete, Fig. 2 is lens imaging schematic diagram, as in figure 2 it is shown, by defocused photographic head
F-number f and lens location v, substitute into lens imaging formulaCalculate, it is thus achieved that
Distance u between photographic head and measured object.
In order to understand explanation the present embodiment, the present embodiment additionally provides measurement distance side based on software
Method realizes process: first, soft at image-signal processor (Image Signal Processing, ISP)
First passing through code Start_preview in part and start preview, it is right to arrange in SetAutoFocusMode
Burnt pattern is automatically, and is focused by code DoAutoFocus, after having focused, passes through
Code GetFocusResult obtains focusing result.And then in Actuctor thread, obtain position,
Wherein, it is Position by the unit of the position acquired in code GetCurrentLensPosition.
And be DAC Code by the unit of the position acquired in code ConvertPostion2Code.
It addition, perform code LookupLensParamTable in the thread of Actuctor, according to DAC
Code finds lens location unit um.By the optical parametric of camera module, i.e. f-number f and camera lens
Position v, brings formula intoDistance u between photographic head and measured object can be calculated.
In the present embodiment, after photographic head is directed at measured object focusing, obtain defocused
The lens motor driving current value of photographic head, then according to the lens motor to defocused photographic head
Driving current value, inquiry lens motor driving current value and lens location mapping table, it is thus achieved that right
The lens location to defocused photographic head answered, and then by the f-number of defocused photographic head and mirror
Head position, the lens imaging formula substituting into camera lens calculates the distance obtained between photographic head and measured object,
Thus the extended distance that can be recorded by terminal unit can coverage to the photographic head of terminal unit
In, solve the technology that cannot utilize terminal unit that longer distance is measured in prior art
Problem.
Embodiment two
The structural representation of a kind of device measuring distance that Fig. 3 provides for the embodiment of the present invention two,
Including: Focusing module 21, acquisition module 22, enquiry module 23 and computing module 24.
Focusing module 21, focuses for photographic head is directed at measured object.
Acquisition module 22, for obtaining the lens motor driving current value to defocused photographic head.
Enquiry module 23, for according to the lens motor driving current value to defocused photographic head, looking into
Ask lens motor driving current value and lens location mapping table, it is thus achieved that corresponding takes the photograph defocused
Lens location as head.
Wherein, distance between sensor in camera lens and photographic head during lens location is photographic head.
Computing module 24, for according to the f-number of defocused photographic head and lens location, using
The lens imaging formula of camera lens calculates the distance obtained between photographic head and measured object.
Concrete, computing module 24 is specifically for by the f-number f of defocused photographic head and camera lens
Position v, substitutes into lens imaging formulaCalculate, it is thus achieved that photographic head and measured object it
Between distance u.
The structural representation of the another kind of device measuring distance that Fig. 4 provides for the embodiment of the present invention two,
On the basis of the device of the measurement distance shown in Fig. 3, Focusing module 21 farther includes: adjust
Unit 211, photographing unit 212, selection unit 213 and setup unit 214.
Adjustment unit 211, for the lens motor driving current value of successive adjustment photographic head, change is taken the photograph
Lens location as head.
Photographing unit 212, for utilizing photographic head to carry out measured object under the conditions of different lens locations
Take pictures.
Select unit 213, for the image obtained from taking pictures, select the target figure that definition is optimum
Picture.
Setup unit 214, for setting the lens motor driving current value of photographic head as acquisition mesh of taking pictures
The lens motor driving current value of photographic head during logo image.
In the present embodiment, after photographic head is directed at measured object focusing, obtain defocused
The lens motor driving current value of photographic head, then according to the lens motor to defocused photographic head
Driving current value, inquiry lens motor driving current value and lens location mapping table, it is thus achieved that right
The lens location to defocused photographic head answered, and then by the f-number of defocused photographic head and mirror
Head position, the lens imaging formula substituting into camera lens calculates the distance obtained between photographic head and measured object,
Thus the extended distance that can be recorded by terminal unit can coverage to the photographic head of terminal unit
In, solve the technology that cannot utilize terminal unit that longer distance is measured in prior art
Problem.
Embodiment three
Present embodiments providing a kind of terminal unit, this terminal equipment configuration has photographic head, the most eventually
End equipment includes the device of the measurement distance that previous embodiment provides.
Terminal unit, can be directed at measured object by photographic head and focus, and obtains defocused shooting
The lens motor driving current value of head, according to the lens motor driving current value to defocused photographic head,
Inquiry lens motor driving current value and lens location mapping table, it is thus achieved that corresponding to defocused
The lens location of photographic head, and then according to the f-number of defocused photographic head and lens location, adopt
The distance obtained between photographic head and measured object is calculated with the lens imaging formula of camera lens.Wherein, mirror
Head position is distance between sensor in camera lens and photographic head in photographic head.
Further, photographic head is directed at measured object and carries out focusing and include by terminal unit: terminal unit by
The lens motor driving current value of secondary adjustment photographic head, changes the lens location of photographic head；In difference
Utilize photographic head that measured object is taken pictures under the conditions of lens location；The image obtained from taking pictures,
Select the target image that definition is optimum；Set the lens motor driving current value of photographic head as taking pictures
The lens motor driving current value of photographic head when obtaining target image.
Further, terminal unit, according to the f-number of defocused photographic head and lens location, uses
The lens imaging formula of camera lens calculates the distance obtained between photographic head and measured object, including: terminal
Equipment, by the f-number f and lens location v to defocused photographic head, substitutes into lens imaging formulaCalculate, it is thus achieved that distance u between photographic head and measured object.
In the present embodiment, after photographic head is directed at measured object focusing, obtain defocused
The lens motor driving current value of photographic head, then according to the lens motor to defocused photographic head
Driving current value, inquiry lens motor driving current value and lens location mapping table, it is thus achieved that right
The lens location to defocused photographic head answered, and then by the f-number of defocused photographic head and mirror
Head position, the lens imaging formula substituting into camera lens calculates the distance obtained between photographic head and measured object,
Thus the extended distance that can be recorded by terminal unit can coverage to the photographic head of terminal unit
In, solve the technology that cannot utilize terminal unit that longer distance is measured in prior art
Problem.
One of ordinary skill in the art will appreciate that: realize the whole of above-mentioned each method embodiment
Or part steps can be completed by the hardware that programmed instruction is relevant.Aforesaid program is permissible
It is stored in a computer read/write memory medium.This program upon execution, performs to include
State the step of each method embodiment；And aforesaid storage medium includes: ROM, RAM, magnetic
The various medium that can store program code such as dish or CD.
It is last it is noted that various embodiments above is only in order to illustrate technical scheme,
It is not intended to limit；Although the present invention being described in detail with reference to foregoing embodiments,
It will be understood by those within the art that: foregoing embodiments still can be remembered by it
The technical scheme carried is modified, or carries out the most some or all of technical characteristic
With replacing；And these amendments or replacement, do not make the essence of appropriate technical solution depart from this
Invent the scope of each embodiment technical scheme.
Claims (7)
1. the method measuring distance, it is characterised in that including:
Photographic head is directed at measured object focus；
Obtain the lens motor driving current value to defocused photographic head；
According to the described lens motor driving current value to defocused photographic head, inquiry lens motor drives
Galvanic electricity flow valuve and lens location mapping table, it is thus achieved that the corresponding described mirror to defocused photographic head
Head position；Described lens location is in described photographic head in camera lens and described photographic head between sensor
Distance；
According to the described f-number to defocused photographic head and lens location, use the saturating of described camera lens
Mirror imaging formula calculates the distance obtained between described photographic head and described measured object.
The method of measurement distance the most according to claim 1, it is characterised in that described will take the photograph
Include as head alignment measured object carries out focusing:
The lens motor driving current value of photographic head described in successive adjustment, changes the mirror of described photographic head
Head position；
Utilize described photographic head that measured object is taken pictures under the conditions of different lens locations；
The image obtained from taking pictures, select the target image that definition is optimum；
Set the lens motor driving current value of described photographic head as take pictures acquisition described target image time
The lens motor driving current value of described photographic head.
The method of measurement distance the most according to claim 1 and 2, it is characterised in that described
According to the described f-number to defocused photographic head and lens location, the lens of described camera lens are used to become
As formula calculates the distance obtained between described photographic head and described measured object, including:
By described f-number f and lens location v to defocused photographic head, substitute into lens imaging public
FormulaCalculate, it is thus achieved that distance u between described photographic head and described measured object.
4. the device measuring distance, it is characterised in that including:
Focusing module, focuses for photographic head is directed at measured object；
Acquisition module, for obtaining the lens motor driving current value to defocused photographic head；
Enquiry module, is used for according to the described lens motor driving current value to defocused photographic head,
Inquiry lens motor driving current value and lens location mapping table, it is thus achieved that corresponding described focusing
After the lens location of photographic head；Described lens location is camera lens and described shooting in described photographic head
Distance between sensor in Tou；
Computing module, for according to the described f-number to defocused photographic head and lens location, adopts
Calculate with the lens imaging formula of described camera lens obtain between described photographic head and described measured object away from
From.
The device of measurement distance the most according to claim 4, it is characterised in that described focusing
Module includes:
Adjustment unit, for the lens motor driving current value of photographic head described in successive adjustment, changes
The lens location of described photographic head；
Photographing unit, for utilizing described photographic head to enter measured object under the conditions of different lens locations
Row is taken pictures；
Select unit, for the image obtained from taking pictures, select the target image that definition is optimum；
Setup unit, for setting the lens motor driving current value of described photographic head as acquisition of taking pictures
The lens motor driving current value of described photographic head during described target image.
6. according to the device of the measurement distance described in claim 4 or 5, it is characterised in that
Described computing module, specifically for by the described f-number f to defocused photographic head and camera lens position
Put v, substitute into lens imaging formulaCalculate, it is thus achieved that described photographic head and described quilt
Survey distance u between thing.
7. a terminal unit, it is characterised in that include photographic head and any one of claim 4-6
The device of described measurement distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510786351.4A CN105891812A (en) | 2015-11-15 | 2015-11-15 | Distance measurement method, device and terminal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510786351.4A CN105891812A (en) | 2015-11-15 | 2015-11-15 | Distance measurement method, device and terminal device |
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| CN105891812A true CN105891812A (en) | 2016-08-24 |
Family
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| CN201510786351.4A Pending CN105891812A (en) | 2015-11-15 | 2015-11-15 | Distance measurement method, device and terminal device |
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Cited By (11)
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| CN106225687A (en) * | 2016-09-06 | 2016-12-14 | 乐视控股（北京）有限公司 | The measuring method of dimension of object and device |
| CN106289118A (en) * | 2016-09-06 | 2017-01-04 | 乐视控股（北京）有限公司 | The detection method of surface smoothness, device and terminal |
| CN106371086A (en) * | 2016-08-30 | 2017-02-01 | 广州华多网络科技有限公司 | Distance measurement method and device |
| CN106506957A (en) * | 2016-11-17 | 2017-03-15 | 维沃移动通信有限公司 | A kind of photographic method and mobile terminal |
| CN107682691A (en) * | 2017-09-12 | 2018-02-09 | 深圳市金立通信设备有限公司 | A kind of method, terminal and the computer-readable recording medium of camera focus calibration |
| WO2018049791A1 (en) * | 2016-09-18 | 2018-03-22 | 中兴通讯股份有限公司 | Focusing compensation device of camera module and method therefor, and camera terminal |
| CN108989791A (en) * | 2018-07-11 | 2018-12-11 | 昆山丘钛微电子科技有限公司 | A kind of linear detection method of motor, device and computer readable storage medium |
| CN111263075A (en) * | 2020-04-01 | 2020-06-09 | 支付宝(杭州)信息技术有限公司 | Method, device and equipment for calibrating lens module comprising voice coil motor |
| CN112954307A (en) * | 2021-01-29 | 2021-06-11 | 昆山丘钛光电科技有限公司 | Position feedback device and method and camera device |
| CN113496522A (en) * | 2020-04-01 | 2021-10-12 | 支付宝(杭州)信息技术有限公司 | Method and device for calibrating lens module comprising voice coil motor |
| WO2023072030A1 (en) * | 2021-11-01 | 2023-05-04 | 中兴通讯股份有限公司 | Automatic focusing method and apparatus for lens, and electronic device and computer-readable storage medium |
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| CN108989791A (en) * | 2018-07-11 | 2018-12-11 | 昆山丘钛微电子科技有限公司 | A kind of linear detection method of motor, device and computer readable storage medium |
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| CN111263075A (en) * | 2020-04-01 | 2020-06-09 | 支付宝(杭州)信息技术有限公司 | Method, device and equipment for calibrating lens module comprising voice coil motor |
| CN113496522A (en) * | 2020-04-01 | 2021-10-12 | 支付宝(杭州)信息技术有限公司 | Method and device for calibrating lens module comprising voice coil motor |
| CN111263075B (en) * | 2020-04-01 | 2022-03-04 | 支付宝(杭州)信息技术有限公司 | Method, device and equipment for calibrating lens module comprising voice coil motor |
| CN112954307A (en) * | 2021-01-29 | 2021-06-11 | 昆山丘钛光电科技有限公司 | Position feedback device and method and camera device |
| WO2023072030A1 (en) * | 2021-11-01 | 2023-05-04 | 中兴通讯股份有限公司 | Automatic focusing method and apparatus for lens, and electronic device and computer-readable storage medium |
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