CN105227835A - A kind of assisted focused method and apparatus - Google Patents
A kind of assisted focused method and apparatus Download PDFInfo
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- CN105227835A CN105227835A CN201510579648.3A CN201510579648A CN105227835A CN 105227835 A CN105227835 A CN 105227835A CN 201510579648 A CN201510579648 A CN 201510579648A CN 105227835 A CN105227835 A CN 105227835A
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Abstract
A kind of assisted focused method, the method is applied to video camera, and the method comprises: steps A, to object Emission Lasers, and receive the laser reflected, according to the transmitting of described laser and the time difference of reception, calculate object distance, this step performs n time, calculates n object distance; Step B, a foundation said n object distance, curve is followed in the zoom focusing issuing n bar corresponding, and carries out corresponding image definition test; Select to there is most object distance corresponding to high distinctness of image evaluation of estimate as optimum object distance; Curve is followed in step C, the zoom focusing issuing described optimum object distance corresponding, follows curve carry out automatic focus according to the focusing of this zoom.Assisted focused method of the present invention utilizes laser precisely to find range, and can issue the focusing of more accurate zoom fast and follow curve, and it is faster more clear to make to focus on.
Description
Technical field
The present invention relates to a kind of focus method and device, particularly relate to a kind of assisted focused method and apparatus.
Background technology
High definition integrated camera can carry out zoom operation in zoom process, in order to keep focusing surface and photo-sensitive cell coplanar, amasthenic lens must be made to follow the movement of zoom lens and movement in real time.For this reason, amasthenic lens can be made to follow curve according to zoom to move.Zoom follows curve representative under certain object distance, the mapping relations between zoom position (namely controlling the zoom motor position of zoom lens movement) and focal position (namely controlling the focus motor position of amasthenic lens movement).Different object distances correspond to different zooms and follows curve.The auto focusing method of current video camera mostly adopts software estimation object distance then to issue zoom focusing and follows curve.On the one hand, estimated value and actual object distance have certain error to this processing mode, and the zoom issued focuses on follows curve not necessarily correctly, and image not necessarily can be focused on the most clear position; On the other hand, in focusing, software estimation carrys out process decision chart image sharpness by FV value (FocusValue, image definition description value); When system produces time delay, FV value may occur that delay causes articulation point position to be forbidden, such system is focused on by the zoom issuing more estimation object distances and follows the position that curve repeatedly judges articulation point, and this will cause the focus movement needs longer time just can complete.
Summary of the invention
For the demand, the present invention proposes a kind of assisted focused method and apparatus, can accurately and focus on fast.
The present invention adopts following technical scheme: a kind of assisted focused method, and the method is applied to video camera, and the method comprises:
Steps A, to object Emission Lasers, and receive the laser that reflects, according to the transmitting of described laser and the time difference of reception, calculate object distance;
Curve is followed in step B, the zoom focusing issuing described object distance corresponding, follows curve carry out automatic focus according to the focusing of this zoom.
The present invention also can adopt following technical scheme: a kind of assisted focused method, and the method is applied to video camera, and the method comprises:
Steps A, n laser is launched to object, and receive the individual laser reflected of n accordingly, according to the launch time of each laser and the time difference of reception, calculate n object distance; Step B, a foundation said n object distance, curve is followed in the zoom focusing issuing n bar corresponding, and carries out corresponding image definition test; Select to there is most object distance corresponding to high distinctness of image evaluation of estimate as optimum object distance;
Curve is followed in step C, the zoom focusing issuing described optimum object distance corresponding, follows curve carry out automatic focus according to the focusing of this zoom.
Preferably, in stepb, described image definition test is after the zoom motor of video camera is run on a certain fixed position, focuses on follow curve according to every bar zoom, and the focus motor of video camera runs to corresponding focal position respectively; For the image that each focal position is taken the photograph, calculate its definition evaluation of estimate, determine described optimum object distance.
Preferably, the described a certain fixed position that the zoom motor of described video camera runs to is focal length end position.
Preferably, in described steps A, launch described laser by laser generator, the part in described laser starts timing through optical system and amplification and rectification circuit flip-flop number; Described laser is mapped to object back reflection and returns, and is received by laser pickoff, and the part in the laser received triggers described counter through optical system and amplification and rectification circuit and stops timing, and the output according to described counter can calculate described object distance.
Present invention also offers a kind of assisted focused device, this application of installation is in video camera, and this device comprises:
Laser ranging module, for Emission Lasers, and receives the laser reflected by object, according to the time difference of the launching and receiving of described laser, calculates object distance; Zoom focuses on processing module, follows curve, carry out automatic focus for issuing zoom focusing according to described object distance.
Preferably, described laser ranging module is repeatedly calculated and is obtained n object distance, described zoom focusing processing module issues the focusing of corresponding n bar zoom and follows curve, video camera is tested this n bar zoom respectively and is focused on the image clarity values of following under curve, select wherein definition the best object distance as optimum object distance, described zoom focuses on processing module and finally issues the zoom of optimum object distance should focusing on and follow curve.
Preferably, described zoom focuses on processing module and zoom motor is run on focal length end position, focuses on and follows curve, focus motor is run to respectively corresponding focal position according to above-mentioned zoom, and photographic images, calculate its definition evaluation of estimate.
Preferably, also comprise control module, described control module, by spi bus and described laser ranging module communication, obtains described object distance information, and passes to zoom focusing processing module.
Preferably, laser ranging module comprises laser generator, optical system, amplification and rectification circuit, laser pickoff and counter, laser launched by described laser generator, and wherein a part of laser triggers described counter through described optical system and described amplification and rectification circuit and starts timing; Another part laser is mapped to object back reflection and returns, and received by laser pickoff, a part in the laser received triggers described counter through optical system and amplification and rectification circuit and stops timing, and the output according to described counter can calculate described object distance.
Therefore, the mode that the present invention is based on laser ranging actual measurement object distance can issue the focusing of more accurate zoom and follow curve, and it is faster more clear to make to focus on.
Accompanying drawing explanation
Accompanying drawing further understands the present invention for providing, and they are included and form a application's part, and accompanying drawing shows embodiments of the invention, and play the effect explaining the principle of the invention together with this specification.In accompanying 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.
Embodiment
The invention discloses and there is a kind of assisted focused method, be applied to video camera, the invention also discloses the assisted focused device that correspondence realizes the method.Other structures due to video camera are not emphasis of the present invention, this patent is not described in detail at this, but basic structural design need ensure that the laser beam that range finder module sends can in the central area of video camera imaging, the object distance of such test is just in time the weight regions focused on, and 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, based on laser ranging, mainly comprises the steps: that n laser ranging obtains n object distance information; Optimum object distance is determined from this n object distance; Issue corresponding zoom focusing according to this optimum object distance and follow curve, carry out automatic focus.
In the present embodiment, n is 3, and namely ranging step performs 3 times, from 3 object distances, determine optimum object distance.Obviously, those of ordinary skill in the art can adjust the value of n as required.
The process of laser ranging comprises; To object Emission Lasers, and receive the laser reflected, according to the transmitting of described laser and the time difference of reception, calculate the distance of object apart from this video camera, i.e. object distance.Specifically, first launch described laser by laser generator, the part in described laser starts timing through optical system and amplification and rectification circuit flip-flop number; Described laser is mapped to object back reflection and returns, and is received by laser pickoff, and the part in the laser received triggers described counter through optical system and amplification and rectification circuit and stops timing, and the output according to described counter can calculate described object distance.
Determine that the mode of optimum object distance is as follows: according to a said n object distance, the zoom focusing issuing n bar corresponding follows curve, to carry out image definition test; Then select to there is most object distance corresponding to high distinctness of image evaluation of estimate as optimum object distance.Wherein the concrete grammar of image definition test comprises: after the zoom motor of video camera is run on a certain fixed position, focuses on follow curve according to every bar zoom, and the focus motor of video camera runs to corresponding focal position respectively; For the image that each focal position is taken the photograph, calculate its definition evaluation of estimate; Finally as described optimum object distance using the object distance corresponding to image the highest for definition evaluation of estimate.
In the method for image definition evaluation value corresponding under curve is followed in the focusing of this n bar zoom of above-mentioned test, the described a certain fixed position that the zoom motor of described video camera runs to is focal length end position.In other embodiments, also can other position, focal length end is not necessary.
Automatic focus step, be focus on according to the zoom that issues according to above-mentioned optimum object distance to follow curve, the zoom motor of video camera and focus motor focal position moved to the ad-hoc location calculated respectively, with keep focusing surface and photo-sensitive cell coplanar, obtain good picture rich in detail, realize focusing on.
Fig. 2 is the assisted focused method schematic diagram in second embodiment of the invention, the main distinction of the assisted focused method in the method and the first execution mode is, laser ranging step Exactly-once, obtain an object distance, then curve is followed in the zoom focusing directly issuing this object distance corresponding, carries out automatic focus.Comparatively speaking, the process determining optimum object distance is eliminated.This execution mode is the accuracy in view of laser ranging, and thinking and only survey an object distance, is also that accuracy is higher.Concrete laser ranging step is identical with the laser distance measurement method in the first execution mode, repeats no more.
Present invention also offers the assisted focused device of corresponding above-mentioned assisted focused method, this device comprises laser ranging module and zoom focuses on processing module, can with reference to shown in figure 3.
Described laser ranging module, for Emission Lasers, and receives the laser reflected by object, according to the time difference of the launching and receiving of described laser, calculates object distance.
In the assisted focused method of above-mentioned first execution mode, the laser ranging step of described laser ranging module performs n time, obtain n object distance, described zoom focuses on processing module and is used for determining optimum object distance from n the object distance that described laser ranging module calculates, and issue corresponding zoom according to described optimum object distance and focus on and follow curve, then carry out automatic focus.The determination mode of concrete optimum object distance was introduced above, was not described in detail.
In the assisted focused method of above-mentioned second execution mode, the laser ranging step of described laser ranging module performs 1 time, obtains 1 object distance, and described zoom focuses on processing module, issues corresponding zoom focusing and follows curve, carry out automatic focus according to this object distance.
Described assisted focused device of the present invention also comprises control module, described control module mainly realizes the control to whole camera chain, described control module is by spi bus and described laser ranging module communication, obtain described object distance information, and described object distance information is passed to zoom focusing processing module.
Introduce lower above-mentioned laser ranging module of the present invention more in detail below, this laser ranging module comprises parts such as controlling power supply, laser generator, laser pickoff, optical system, amplification and rectification circuit, counter, sample circuit.The detailed process of described laser ranging module range finding is as follows: after receiving distance measuring instruction, laser ranging module enters range finding operating state, aforementioned control module sends reset signal, above-mentioned counter resetted to counting and realizes the gain control of amplification and rectification circuit, now triggering above-mentioned generating laser and send pulse laser.Carry out opto-electronic conversion by sample circuit to the fraction laser that aforementioned laser generator is launched, as the enabling signal of control circuit range finding counting, this hour counter starts counting.Other most of laser are mapped to target and reflect and gather in laser pickoff, carry out opto-electronic conversion, and carry out amplification process through amplification and rectification circuit, be transferred to the pass gate signal of control circuit as range finding counting, counter stops counting, can calculate the distance of target to be measured according to the output of counter.The measurement result of distance, namely an object distance information, is saved in single-chip microcomputer after calculating, and is transferred to described control module.
The assisted focused device of the present invention utilizes laser ranging module, can Obtaining Accurate object distance, decrease the time of preferred object distance identification, especially under low photograph, many scenes, high light occasion, more can embody the quick assisted focused ability of the design and the advantage of imaging high definition.
Those skilled in the art can be obvious, can carry out various modifications and variations and without departing from the spirit and scope of the present invention to above-mentioned exemplary embodiment of the present invention.Therefore, be intended to that the present invention is covered and drop within the scope of appended claims and equivalent arrangements thereof to amendment of the present invention and modification.
Claims (10)
1. an assisted focused method, the method is applied to video camera, it is characterized in that, the method comprises:
Steps A, to object Emission Lasers, and receive the laser that reflects, according to the transmitting of described laser and the time difference of reception, calculate object distance;
Curve is followed in step B, the zoom focusing issuing described object distance corresponding, follows curve carry out automatic focus according to the focusing of this zoom.
2. an assisted focused method, the method is applied to video camera, it is characterized in that, the method comprises:
Steps A, n laser is launched to object, and receive the individual laser reflected of n accordingly, according to each transmitting of described laser and the time difference of reception, calculate n object distance;
Step B, a foundation said n object distance, curve is followed in the zoom focusing issuing n bar corresponding, and carries out corresponding image definition test; Select to there is most object distance corresponding to high distinctness of image evaluation of estimate as optimum object distance;
Curve is followed in step C, the zoom focusing issuing described optimum object distance corresponding, follows curve carry out automatic focus according to the focusing of this zoom.
3. assisted focused method as claimed in claim 2, it is characterized in that, in stepb, described image definition test is after the zoom motor of video camera is run on a certain fixed position, focus on according to every bar zoom and follow curve, the focus motor of video camera runs to corresponding focal position respectively; For the image that each focal position is taken the photograph, calculate its definition evaluation of estimate, determine described optimum object distance.
4. assisted focused method as claimed in claim 3, is characterized in that, the described a certain fixed position that the zoom motor of described video camera runs to is focal length end position.
5. assisted focused method as claimed in claim 2, is characterized in that, in described steps A, launches described laser by laser generator, and the part in described laser starts timing through optical system and amplification and rectification circuit flip-flop number; Described laser is mapped to object back reflection and returns, and is received by laser pickoff, and the part in the laser received triggers described counter through optical system and amplification and rectification circuit and stops timing, and the output according to described counter can calculate described object distance.
6. an assisted focused device, this application of installation, in video camera, is characterized in that, this device comprises:
Laser ranging module, for Emission Lasers, and receives the laser reflected by object, according to the time difference of the launching and receiving of described laser, calculates object distance;
Zoom focuses on processing module, follows curve, carry out automatic focus for issuing zoom focusing according to described object distance.
7. assisted focused device as claimed in claim 6, it is characterized in that: described laser ranging module is repeatedly calculated and obtained n object distance, described zoom focusing processing module issues the focusing of corresponding n bar zoom and follows curve, video camera is tested this n bar zoom respectively and is focused on the image clarity values of following under curve, select wherein definition the best object distance as optimum object distance, described zoom focuses on processing module and finally issues the zoom of optimum object distance should focusing on and follow curve.
8. assisted focused device as claimed in claim 7, it is characterized in that: described zoom focuses on processing module and zoom motor is run on focal length end position, focus on according to above-mentioned zoom and follow curve, focus motor is run to respectively corresponding focal position, and photographic images, calculate its definition evaluation of estimate.
9. assisted focused device as claimed in claim 6, is characterized in that: also comprise control module, and described control module, by spi bus and described laser ranging module communication, obtains described object distance information, and passes to zoom focusing processing module.
10. assisted focused device as claimed in claim 6, it is characterized in that, laser ranging module comprises laser generator, optical system, amplification and rectification circuit, laser pickoff and counter, laser launched by described laser generator, and wherein a part of laser triggers described counter through described optical system and described amplification and rectification circuit and starts timing; Another part laser is mapped to object back reflection and returns, and received by laser pickoff, a part in the laser received triggers described counter through optical system and amplification and rectification circuit and stops timing, and the output according to described counter can calculate described object distance.
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| CN112601006A (en) * | 2020-11-10 | 2021-04-02 | 山东信通电子股份有限公司 | Tracking focusing method and device based on pan-tilt camera |
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