CN105227835B - A kind of assisted focused method and apparatus - Google Patents
A kind of assisted focused method and apparatus Download PDFInfo
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- CN105227835B CN105227835B CN201510579648.3A CN201510579648A CN105227835B CN 105227835 B CN105227835 B CN 105227835B CN 201510579648 A CN201510579648 A CN 201510579648A CN 105227835 B CN105227835 B CN 105227835B
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Abstract
A kind of assisted focused method, this method are applied to video camera, and this method includes：Step A, laser is emitted to object, and receives reflected laser, according to the time difference of the transmitting of the laser and reception, calculate object distance, which executes n times, n object distance is calculated；Step B, it according to above-mentioned n object distance, issues the corresponding change zoom and focus of n items and follows curve, and carry out corresponding image definition test；It selects with the object distance corresponding to highest image definition evaluation value as optimal object distance；Step C, it issues the corresponding change zoom and focus of the optimal object distance and follows curve, follow curve to be focused automatically according to the change zoom and focus.The assisted focused method of the present invention utilizes the accurate ranging of laser, can quickly issue more accurate change zoom and focus and follow curve so that focuses faster apparent.
Description
Technical field
The present invention relates to a kind of focus method and device more particularly to a kind of assisted focused method and apparatus.
Background technology
High definition integrated camera can carry out zoom operation during zoom, in order to keep focusing surface total with photosensitive element
Face, it is necessary to amasthenic lens be made to follow the movement of zoom lens and move in real time.For this purpose, amasthenic lens can be made to be followed according to zoom
Curve is moved.Zoom follows curve to represent under certain object distance, and zoom position (controls the zoom electricity of zoom lens movement
Set seat in the plane) focal position (i.e. control amasthenic lens movement focus motor position) between mapping relations.Different object distances pair
Different zooms is answered to follow curve.The auto focusing method of video camera mostly uses greatly software estimation object distance and then issues change at present
Zoom and focus follows curve.On the one hand, estimated value has certain error to this processing mode with practical object distance, and the zoom issued is poly-
Coke follows curve not necessarily correct, and making image not necessarily can focus on most clear position；On the other hand, in focusing
In, software estimation is to judge image definition by FV values (Focus Value, image definition description value)；It is produced in system
In the case of raw delay, FV values it is possible that delay causes articulation point position inaccurate, by issuing more a plurality of estimated by such system
The position that the change zoom and focus of object distance follows curve repeatedly to judge articulation point is calculated, and this will cause focus movement to take longer for
It could complete.
Invention content
For the demand, the present invention proposes a kind of assisted focused method and apparatus, can accurately and quickly focus.
The present invention adopts the following technical scheme that：A kind of assisted focused method, this method are applied to video camera, this method packet
It includes：
Step A, laser is emitted to object, and receives reflected laser, according to the transmitting and reception of the laser
Time difference, calculate object distance；
Step B, it issues the corresponding change zoom and focus of the object distance and follows curve, follow curve to carry out certainly according to the change zoom and focus
It is dynamic to focus.
The present invention can also adopt the following technical scheme that：A kind of assisted focused method, this method are applied to video camera, the party
Method includes：
Step A, n laser is emitted to object, and accordingly receives n reflected laser, according to each laser
Launch time and reception time difference, calculate n object distance；Step B, according to above-mentioned n object distance, the corresponding zoom of n items is issued
Focusing follows curve, and carries out corresponding image definition test；Selection has corresponding to highest image definition evaluation value
Object distance is as optimal object distance；
Step C, issue the corresponding change zoom and focus of the optimal object distance and follow curve, according to the change zoom and focus follow curve into
Row is automatic to be focused.
Preferably, in stepb, described image resolving power test is the zoom motor operation by video camera in a certain fixation
Behind position, becomes zoom and focus according to every and curve, the focus motor of video camera is followed to be separately operable corresponding focal position；For
The image taken the photograph on each focal position calculates its clarity evaluation of estimate, determines the optimal object distance.
Preferably, a certain fixed position that the zoom motor operation of the video camera arrives is focal length end position.
Preferably, in the step A, the laser is launched by laser generator, the part warp in the laser
It crosses optical system and amplification and rectification circuit flip-flop number starts timing；The laser is mapped to object back reflection and returns, and by
Laser pickoff receives, and the part in the laser received triggers the counter by optical system and amplification and rectification circuit
Stop timing, the object distance can be calculated according to the output of the counter.
The present invention also provides a kind of assisted focused device, which is applied to video camera, which includes：
Laser ranging module for emitting laser, and is received by the reflected laser of object, according to the laser
Transmitting and the time difference received, calculate object distance；Zoom focusing module is followed for issuing change zoom and focus according to the object distance
Curve is focused automatically.
Preferably, n object distance is repeatedly calculated and obtained to the laser ranging module, and the zoom focusing module issues
Corresponding n items become zoom and focus and follow curve, and video camera tests the n items and becomes zoom and focus respectively follows image definition under curve
Value selects the object distance that wherein clarity is best as optimal object distance, and the zoom focusing module finally issues correspondence
The change zoom and focus of the optimal object distance follows curve.
Preferably, the zoom focusing module is gathered by zoom motor operation in focal length end position according to above-mentioned zoom
Coke follows curve, focus motor is separately operable corresponding focal position, and shoot image, calculates its clarity evaluation of estimate.
Preferably, further include control module, the control module is communicated by spi bus with the laser ranging module,
The object distance information is obtained, and passes to zoom focusing module.
Preferably, laser ranging module include laser generator, optical system, amplification and rectification circuit, laser pickoff and
Counter, the laser generator launch laser, and a portion laser passes through the optical system and the amplification shaping
Circuit triggers the counter and starts timing；Another part laser is mapped to object back reflection and returns, and is connect by laser pickoff
It receives, the part in the laser received triggers the counter by optical system and amplification and rectification circuit and stops timing, root
The object distance can be calculated according to the output of the counter.
Therefore, the mode of object distance is surveyed the present invention is based on laser ranging can issue more accurate change zoom and focus and follow
Curve so that focus faster apparent.
Description of the drawings
Attached drawing is to provide further understanding of the invention, they are included and constitute part of this application, attached drawing
It shows the embodiment of the present invention, and plays the role of the explanation principle of the invention together with this specification.In attached drawing：
Fig. 1 is the assisted focused method schematic diagram of first embodiment of the invention.
Fig. 2 is the assisted focused method schematic diagram of second embodiment of the invention.
Fig. 3 is the module diagram of the assisted focused device of the present invention.
Specific implementation mode
The invention discloses with a kind of assisted focused method, it is applied to video camera, is realized the invention also discloses corresponding
The assisted focused device of this method.Since the other structures of video camera are not the emphasis of the present invention, this patent is not retouched in detail herein
It states, but basic structure design need to ensure that the laser beam that range finder module is sent out can be in the central area of video camera imaging, in this way
The object distance of test is exactly the weight regions focused, ensures the validity of object distance.
Fig. 1 is the assisted focused method schematic diagram in first embodiment of the invention, and the assisted focused method of the present invention is based on
Laser ranging mainly includes the following steps：N times laser ranging obtains n object distance information；Optimal object is determined from this n object distance
Away from；Corresponding change zoom and focus is issued according to the optimal object distance and follows curve, is focused automatically.
In the present embodiment, 3 n, i.e. ranging step execute 3 times, and optimal object distance is determined from 3 object distances.Obviously, originally
The those of ordinary skill in field can adjust the value of n as needed.
The process of laser ranging includes；Laser is emitted to object, and receives reflected laser, according to the laser
Transmitting and reception time difference, calculate distance of the object apart from the video camera, i.e. object distance.Specifically, first by laser
Generator launches the laser, and the part in the laser is opened by optical system and amplification and rectification circuit flip-flop number
Beginning timing；The laser is mapped to object back reflection and returns, and is received by laser pickoff, the part in the laser received
The counter is triggered by optical system and amplification and rectification circuit and stops timing, can be calculated according to the output of the counter
Go out the object distance.
Determine that the mode of optimal object distance is as follows：According to above-mentioned n object distance, issues the corresponding change zoom and focus of n items and follows curve,
To carry out image definition test；Then it selects with the object distance corresponding to highest image definition evaluation value as optimal object
Away from.The specific method of wherein image definition test includes：By the zoom motor operation of video camera behind a certain fixed position, root
Becoming zoom and focus according to every follows curve, the focus motor of video camera to be separately operable corresponding focal position；It is poly- for each
The image taken the photograph on burnt position calculates its clarity evaluation of estimate；Being finally will be corresponding to the highest image of clarity evaluation of estimate
Object distance is as the optimal object distance.
It is followed under curve in the method for corresponding image definition evaluation value in above-mentioned test n items change zoom and focus, it is described
The a certain fixed position that the zoom motor operation of video camera arrives is focal length end position.In other embodiments, can also
Other positions, focal length end are not required.
Automatic focus steps are to follow curve according to the change zoom and focus issued according to above-mentioned optimal object distance, by the change of video camera
Times motor and focus motor focal position are moved respectively to the specific position calculated, to keep focusing surface total with photosensitive element
Face obtains preferable clear image, realizes and focuses.
Fig. 2 is the assisted focused method schematic diagram in second embodiment of the invention, in this method and first embodiment
The main distinction of assisted focused method be that laser ranging step Exactly-once obtains an object distance, then directly issues
The corresponding change zoom and focus of the object distance follows curve, is focused automatically.In comparison, the process for determining optimal object distance is omitted.
The embodiment is the accuracy in view of laser ranging, it is believed that only surveys an object distance and accuracy is higher.Specific laser
Ranging step is identical with the laser distance measurement method in first embodiment, repeats no more.
The present invention also provides the assisted focused device of the above-mentioned assisted focused method of correspondence, which includes laser ranging mould
Block and zoom focusing module, can refer to shown in Fig. 3.
The laser ranging module for emitting laser, and receives by the reflected laser of object, swashs according to described
The transmitting of light and the time difference received, calculate object distance.
In the assisted focused method of above-mentioned first embodiment, the laser ranging step of the laser ranging module executes
N times, obtain n object distance, in the n object distance that the zoom focusing module is used to calculate from the laser ranging module
It determines optimal object distance, and corresponding change zoom and focus is issued according to the optimal object distance and follows curve, then focused automatically.
The method of determination of specific optimal object distance had been introduced above, was not described in detail.
In the assisted focused method of above-mentioned second embodiment, the laser ranging step of the laser ranging module executes
1 time, 1 object distance is obtained, the zoom focusing module issues corresponding change zoom and focus according to the object distance and follows curve,
Automatically it is focused.
The assisted focused device of the present invention further includes control module, and the control module is mainly realized to entirely imaging
The control of machine system, the control module are communicated by spi bus with the laser ranging module, and the object distance information is obtained,
And the object distance information is passed into zoom focusing module.
Be discussed in detail the above-mentioned laser ranging module of the lower present invention again below, the laser ranging module include control power supply,
The parts such as laser generator, laser pickoff, optical system, amplification and rectification circuit, counter, sample circuit.The Laser Measuring
Detailed process away from module ranging is as follows：After receiving distance measuring instruction, laser ranging module enters ranging working condition, aforementioned
Control module sends out reset signal, and the gain that above-mentioned counter resets counting and realize amplification and rectification circuit is made to control,
Above-mentioned laser emitter is triggered at this time sends out pulse laser.The fraction laser that aforementioned laser generator is emitted by sample circuit
Opto-electronic conversion is carried out, as the enabling signal that control circuit ranging counts, this hour counter starts counting up.Other most of laser
It is mapped to target to reflect and gather in laser pickoff, carries out opto-electronic conversion, and processing is amplified through amplification and rectification circuit, pass
It is defeated by the door signal that control circuit is counted as ranging, counter stops counting, can be calculated according to the output of counter
The distance of object to be measured.The measurement result of distance, i.e. an object distance information, are saved in microcontroller after calculating, and are transferred to described
Control module.
The assisted focused device of the present invention utilizes laser ranging module, can accurately obtain object distance, reduces preferred object distance and knows
Other time can more embody quick assisted focused ability and the imaging of the design especially in the case where low photograph, more scenes, strong laser field close
The advantages of fine definition.
Those skilled in the art can be obvious, can to the present invention the above exemplary embodiments carry out various modifications and modification and
Without departing from the spirit and scope of the present invention.Accordingly, it is intended to which present invention covering is made to fall in the appended claims and its equivalence techniques
Modifications of the present invention in aspects and modification.
Claims (8)
1. a kind of assisted focused method, this method is applied to video camera, which is characterized in that this method includes：
Step A, n laser is emitted to object, and accordingly receives n reflected laser, according to each laser
Transmitting and reception time difference, calculate n object distance；
Step B, it according to above-mentioned n object distance, issues the corresponding change zoom and focus of n items and follows curve, and carry out corresponding image clearly
Degree test；It selects with the object distance corresponding to highest image definition evaluation value as optimal object distance；
Step C, it issues the corresponding change zoom and focus of the optimal object distance and follows curve, follow curve to carry out certainly according to the change zoom and focus
It is dynamic to focus.
2. assisted focused method as described in claim 1, which is characterized in that in stepb, described image resolving power test is
By the zoom motor operation of video camera behind a certain fixed position, becomes zoom and focus according to every and follow curve, the focusing of video camera
Motor is separately operable corresponding focal position；For the image taken the photograph on each focal position, the evaluation of its clarity is calculated
Value, determines the optimal object distance.
3. assisted focused method as claimed in claim 2, which is characterized in that the institute that the zoom motor operation of the video camera arrives
It is focal length end position to state a certain fixed position.
4. assisted focused method as described in claim 1, which is characterized in that in the step A, emitted by laser generator
Go out the laser, the part in the laser starts timing by optical system and amplification and rectification circuit flip-flop number；Institute
It states laser and is mapped to object back reflection and, and received by laser pickoff, the part in the laser received passes through optics
System and amplification and rectification circuit trigger the counter and stop timing, and the object can be calculated according to the output of the counter
Away from.
5. a kind of assisted focused device, which is applied to video camera, which is characterized in that the device includes：
Laser ranging module for emitting laser, and is received by the reflected laser of object, the transmitting according to the laser
With the time difference of reception, object distance is calculated；
Zoom focusing module follows curve for issuing change zoom and focus according to the object distance, is focused automatically；
N object distance is repeatedly calculated and obtained to the laser ranging module, and the zoom focusing module issues corresponding n items and becomes
Zoom and focus follows curve, and video camera tests the n items and becomes zoom and focus respectively follows image clarity values under curve, selects wherein clear
For a best object distance of clear degree as optimal object distance, the zoom focusing module finally issues the change of the corresponding optimal object distance
Zoom and focus follows curve.
6. assisted focused device as claimed in claim 5, it is characterised in that：The zoom focusing module is by zoom motor
Focal length end position is run on, curve is followed according to above-mentioned change zoom and focus, focus motor is separately operable corresponding focal position,
And image is shot, calculate its clarity evaluation of estimate.
7. assisted focused device as claimed in claim 5, it is characterised in that：Further include control module, the control module is logical
It crosses spi bus to communicate with the laser ranging module, obtains the object distance information, and pass to zoom focusing module.
8. assisted focused device as claimed in claim 5, which is characterized in that laser ranging module includes laser generator, light
System, amplification and rectification circuit, laser pickoff and counter, the laser generator launch laser, and a portion swashs
Light triggers the counter by the optical system and the amplification and rectification circuit and starts timing；Another part laser is mapped to mesh
Mark object back reflection is returned, and is received by laser pickoff, and the part in the laser received is whole by optical system and amplification
Shape circuit triggers the counter and stops timing, and the object distance can be calculated according to the output of the counter.
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| JP6543875B2 (en) * | 2017-09-28 | 2019-07-17 | エスゼット ディージェイアイ テクノロジー カンパニー リミテッドＳｚ Ｄｊｉ Ｔｅｃｈｎｏｌｏｇｙ Ｃｏ．，Ｌｔｄ | Control device, imaging device, flying object, control method, program |
| CN112748438A (en) * | 2019-10-31 | 2021-05-04 | 傲基科技股份有限公司 | Method suitable for accurate positioning of laser ranging device and laser ranging system and method |
| CN112601006B (en) * | 2020-11-10 | 2022-06-10 | 山东信通电子股份有限公司 | Tracking focusing method and device based on pan-tilt camera |
| CN112601012B (en) * | 2020-12-07 | 2022-03-01 | 深圳市维海德技术股份有限公司 | Zoom follow-up method, device and computer readable storage medium |
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