CN105827962A - Correction method and device of movement back focal length deviation of camera - Google Patents
Correction method and device of movement back focal length deviation of camera Download PDFInfo
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- CN105827962A CN105827962A CN201610169571.7A CN201610169571A CN105827962A CN 105827962 A CN105827962 A CN 105827962A CN 201610169571 A CN201610169571 A CN 201610169571A CN 105827962 A CN105827962 A CN 105827962A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
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- 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
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Abstract
The present invention provides a correction method of the movement back focal length deviation of a camera. The method comprises the steps of setting that a variable multiple motor is located at a position of a predetermined multiple; when the variable multiple motor is located at the position of the predetermined multiple, moving a zoom motor within a predetermined range, and obtaining a focusing evaluation function corresponding to the movement of the zoom motor; according to an extreme point of the focusing evaluation function, determining a position of the zoom motor corresponding to the predetermined multiple. According to the present invention, a clear focusing image can be obtained, and the image shooting quality is improved.
Description
Technical field
The invention belongs to imaging field, the burnt bearing calibration offset and device after particularly relating to the movement of video camera.
Background technology
Movement is the vitals of video camera, has generally comprised camera lens, electronographic device, image processing system and automatic control system.The designing technique of movement relate to optics, electricity, machinery in one, there is electronic anamorphosis function and zoom function, be widely used in safety monitoring industry.
For the camera lens of movement in video camera, in addition to the optical channel of common lens is provided, be also built-in with can the ZOOM motor (being also called zoom motor) of Electronic control, and FOCUS motor (being also called zoom motor)；Electronographic device is photoelectric conversion sensor, the most usually said sensor, and what current industry commonly used is two kinds of sensors of CMOS and CCD；The image (i.e. RAWDATA) in a raw of sensor output is input to image processing system, RAWDATA is then extracted by image processing system, and the color of image, brightness aspect etc. are automatically processed, then export the visualization video of different-format；Automatic control system is the key component of movement, according to certain algorithm policy, calculates camera lens and carries out zoom ZOOM, zoom FOCUS, and control associated external device drive ZOOM, FOCUS motor movement.
Movement is optical, mechanical and electronic integration equipment, and the distance of the target surface of sensor to rear lens focus otherwise must can cause some burnt section cannot focus on clear in strict conformity with the design requirement of camera lens.Rear Jiao is burnt after generally comprising burnt after optics and machinery, after optics, Jiao is last sheet glass of the camera lens distance to focussing plane, owing to glass is built in camera lens, burnt and bad assurance after optics, therefore concept burnt after introducing machinery, after machinery, Jiao is the self-defining mechanical reference points of camera lens, is the focussing plane distance that arrives a certain mechanical. points.It is clear that Jiao is easier to quantitative Analysis, designs and test after machinery, either burnt after burnt still optics after machinery, in fact it is provided to guarantee camera lens burnt section entirely and focuses on clearly reference frame, in order that the installation site that specification sensor is on camera lens.
When design and production, rear Jiao needs strict guarantee, but due to the various vibrations in transport vibrations, material aging, variations in temperature, life cycle, burnt after all may result in skew occur, thus cause some burnt section cannot focus on clear, affect the shooting quality of image.
Summary of the invention
It is an object of the invention to provide bearing calibration and the device of burnt skew after the movement of a kind of video camera, with solve prior art rear burnt skew occurs time, cause some burnt section cannot focus on clear, the problem affecting the shooting quality of image.
First aspect, the bearing calibration of burnt skew after embodiments providing the movement of a kind of video camera, described method includes:
Set zoom motor and be in the position of prearranged multiple；
Described zoom motor, when the position of prearranged multiple, is moved in preset range by zoom motor, obtains autofocus evaluation function corresponding when described zoom motor moves；
According to the extreme point of described autofocus evaluation function, determine the position of the zoom motor corresponding with described prearranged multiple according to described extreme point.
In conjunction with first aspect, in the first possible implementation of first aspect, the described extreme point according to described autofocus evaluation function, determine that according to described extreme point the position step of the zoom motor corresponding with described prearranged multiple includes:
Judge whether described autofocus evaluation function extreme point occurs；
If there is extreme point, then determine the position of the zoom motor corresponding with described prearranged multiple according to described extreme point；
Without extreme point occurs, then in described preset range, increase the interval of predetermined ratio, search extreme point in the interval after increase, determine the position of the zoom motor corresponding with described prearranged multiple according to described extreme point.
In conjunction with first aspect, in the possible implementation of the second of first aspect, described method also includes:
Obtain the extreme point of the autofocus evaluation function corresponding to position of the zoom motor of multiple different prearranged multiple；
Extreme point according to autofocus evaluation function corresponding to multiple different prearranged multiples determines the position of multiple zoom motor；
The position of the plurality of zoom motor is fitted, generates the zoom zoom curve after correction.
The possible implementation of the second in conjunction with first aspect, in the third possible implementation of first aspect, the position of the zoom motor of the plurality of different prearranged multiple, according to zoom motor from WIDE wide-angle side to the change of TELE distant view end, the interval of the multiple of zoom motor institute zoom is the biggest.
In conjunction with first aspect, the 4th kind of first aspect may in implementation, the preset range of described zoom motor be by standard zoom position corresponding in the zoom zoom curve of standard centered by region.
Second aspect, the correcting unit of burnt skew after embodiments providing the movement of a kind of video camera, described device includes:
Position setup unit, is in the position of prearranged multiple for setting zoom motor；
Function acquiring unit, when the described zoom motor position at prearranged multiple, is moved in preset range by zoom motor, obtains autofocus evaluation function corresponding when described zoom motor moves；
Position determination unit, for the extreme point according to described autofocus evaluation function, determines the position of the zoom motor corresponding with described prearranged multiple according to described extreme point.
In conjunction with second aspect, in the first possible implementation of second aspect, described position determination unit includes:
Extreme value judgment sub-unit, is used for judging whether described autofocus evaluation function extreme point occurs；
Primary importance determines subelement, for if there is extreme point, then determines the position of the zoom motor corresponding with described prearranged multiple according to described extreme point；
The second position determines subelement, for without there is extreme point, then increases the interval of predetermined ratio in described preset range, searches extreme point, determine the position of the zoom motor corresponding with described prearranged multiple according to described extreme point in the interval after increase.
In conjunction with second aspect, in the possible implementation of the second of second aspect, described device also includes:
Extreme point acquiring unit, for obtaining the extreme point of the autofocus evaluation function corresponding to position of the zoom motor of multiple different prearranged multiple；
Multiposition determines unit, and the extreme point for the autofocus evaluation function corresponding according to multiple different prearranged multiples determines the position of multiple zoom motor；
Fitting unit, for being fitted the position of the plurality of zoom motor, generates the zoom zoom curve after correction.
The possible implementation of the second in conjunction with second aspect, in the third possible implementation of second aspect, the position of the zoom motor of the plurality of different prearranged multiple, according to zoom motor from WIDE wide-angle side to the change of TELE distant view end, the interval of the multiple of zoom motor institute zoom is the biggest.
In conjunction with second aspect, the 4th kind of second aspect may in implementation, the preset range of described zoom motor be by standard zoom position corresponding in the zoom zoom curve of standard centered by region.
In the present invention, by setting zoom motor behind the position corresponding to prearranged multiple, mobile zoom motor in preset range, obtain the autofocus evaluation function corresponding to zoom motor in preset range, and determine, according to described autofocus evaluation function, the position that zoom motor is corresponding, during so that the zoom motor of video camera is in prearranged multiple, available focusedimage clearly, improves image taking quality.
Accompanying drawing explanation
Fig. 1 is the normally used zoom of movement, zoom curve synoptic diagram；
Fig. 2 be the video camera that first embodiment of the invention provides movement after the flowchart of bearing calibration of burnt skew；
Fig. 3 be the video camera that second embodiment of the invention provides movement after the flowchart of bearing calibration of burnt skew；
Fig. 4 be the video camera that third embodiment of the invention provides movement after the flowchart of bearing calibration of burnt skew；
Fig. 5 be the video camera that fourth embodiment of the invention provides movement after the structural representation of correcting unit of burnt skew.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The main purpose of the embodiment of the present invention is, a kind of camera back focus bearing calibration is provided, to solve video camera in the vibrations of transportation, or video camera itself is due to the temperature in aging, the air ambient by material, the changing of humidity so that camera back focus offsets.The skew of rear Jiao may make part Jiao's section clearly to focus on, cause can not the image of shooting clear, the problem affecting product reliability of operation.As it is shown in figure 1, movement generally have one group by designing and manufacture the zoom of decision, zoom curve, this curve describes under different object distances, the corresponding relation of the zoom motor of diverse location and the position of zoom motor.After movement is assembled into finished product, need curve is corrected, i.e. correct ZOOM zoom motor, the physical location of FOCUS zoom motor and the difference of theoretical position according to the individual variation of movement, thus ensure that the difference on curve can vernier focusing.It is described in detail below in conjunction with the accompanying drawings:
Embodiment one:
Fig. 2 show first embodiment of the invention the movement of video camera is provided after burnt skew bearing calibration realize flow process, details are as follows:
In step s 201, set zoom motor and be in the position of prearranged multiple.
Concrete, zoom motor described in the embodiment of the present invention, i.e. for regulating the far and near device of described camera photography picture.Generally can be regulated between WIDE wide-angle side and TELE distant view end by regulation button, such as in the WIDE wide-angle side of video camera, the multiple corresponding to zoom camera may be 1 times, be represented by the form of 1X.At the TELE end of video camera, the multiple corresponding to zoom camera may be 20 times etc..According to the difference of video camera, multiple also has corresponding change.
Described prearranged multiple, by the way of software adjustment controls, can arbitrarily select the position of the zoom motor of a multiple, and the accurate focusing position of the zoom motor corresponding to this position is adjusted correction.
In step S202, described zoom motor, when the position of prearranged multiple, is moved in preset range by zoom motor, obtains autofocus evaluation function corresponding when described zoom motor moves.
Concrete, behind the position determining described zoom motor, i.e. can determine that the state of shooting amplification residing for current camera, certainly, corresponding with the position of described zoom motor, target object and the distance of video camera in the image of currently shooting can be set accordingly, such that it is able to form preferable, to include target object image, conveniently the image including target object is carried out quality analysis.
In embodiments of the present invention, the moving range of described zoom motor, can be selected by the zoom zoom curve of standard.Region such as in the standard zoom zoom curve shown in Fig. 1, centered by the position of the zoom motor corresponding to multiple of zoom motor selected in step s 201.Owing to the position of the zoom motor under different object distances also differs, the central point of the preset range that the meansigma methods of the position that can choose more zoom motor moves as zoom motor.The length of the preset range of described zoom motor, can be according to the needs of user, or the zooming range according to camera is set flexibly.It is of course also possible under current object distance, zoom motor full scale stretch, obtain zoom motor at the autofocus evaluation function corresponding to diverse location.
Described autofocus evaluation function, can be used for the picture quality after focusing on is detected and assessed, and described autofocus evaluation function includes but not limited to shade of gray function, informatics function, frequency-domain function, statistics function etc..
In described preset range, when zoom motor moves, the value of the autofocus evaluation function that available multiple zoom motor are corresponding when moving.
In step S203, according to the extreme point of described autofocus evaluation function, determine the position of the zoom motor corresponding with described prearranged multiple according to described extreme point.
Movement along with zoom motor, available described zoom motor is in the value of the multiple autofocus evaluation functions corresponding to diverse location, the extreme point of available autofocus evaluation function after multiple data are compared, the position of the zoom motor corresponding to described autofocus evaluation function extreme point, it is video camera and can form the focal position of picture rich in detail, the corrected value that the zoom magnification of recordable lower described prearranged multiple and correspondence thereof uses as follow-up video camera.During using at video camera, when the zoom number set is as described prearranged multiple, then adjusts the corresponding zoom magnification to record, i.e. can get picture rich in detail.
The embodiment of the present invention is by setting zoom motor behind the position corresponding to prearranged multiple, mobile zoom motor in preset range, obtain the autofocus evaluation function corresponding to zoom motor in preset range, and determine, according to described autofocus evaluation function, the position that zoom motor is corresponding, during so that the zoom motor of video camera is in prearranged multiple, available focusedimage clearly, improves image taking quality.
Embodiment two:
Fig. 3 show the movement of the video camera that second embodiment of the invention provides after burnt skew bearing calibration realize flow process, details are as follows:
In step S301, set zoom motor and be in the position of prearranged multiple.
In step s 302, described zoom motor, when the position of prearranged multiple, is moved in preset range by zoom motor, obtains autofocus evaluation function corresponding when described zoom motor moves.
Step S301-S302 is essentially identical with step S201-S202 in embodiment one, is not repeated at this and repeats.
In step S303, it is judged that whether described autofocus evaluation function extreme point occurs；
In embodiments of the present invention, autofocus evaluation function value when can be moved zoom motor by the autofocus evaluation function selected is added up and compares, it is judged that whether described autofocus evaluation function extreme point occurs.
The extreme point of described autofocus evaluation function, can be by setting a threshold value, when one of them autofocus evaluation function value is more than other all of autofocus evaluation function value, and difference more than described threshold value time, then it is believed that extreme point exists, if less than described threshold value, then it is assumed that extreme point does not exists.
In step s 304, if there is extreme point, then the position of the zoom motor corresponding with described prearranged multiple is determined according to described extreme point；
If there is the extreme point of autofocus evaluation function value, the most described prearranged multiple is corresponding with the position of the zoom camera being in described extreme point.During subsequent use, if it is determined that for determining the position of the zoom motor of multiple, then the position directly invoking zoom camera corresponding to described extreme point carries out focusing process.
In step S305, without extreme point occurs, then in described preset range, increase the interval of predetermined ratio, search extreme point in the interval after increase, determine the position of the zoom motor corresponding with described prearranged multiple according to described extreme point.
In embodiments of the present invention, if being not detected by the extreme point of described autofocus evaluation function value in preset range, then after explanation, Jiao exists focus issues, need the focusing range of rear Jiao is corrected further.
In embodiments of the present invention, by increasing the interval of predetermined ratio in preset range, in the described interval increased, search the extreme point of autofocus evaluation function value.Wherein, in described preset range, such as preset range is 10X-20X, and predetermined ratio is 10%, then the interval after increase is 9X-21X, such that it is able to the value improving the autofocus evaluation function value corresponding to zoom motor further is counted, improves the probability of calibration.If the most not finding the extreme point of autofocus evaluation function value, then can repeat further to increase the interval detected.
During it addition, the interval after increase is calibrated, step value can be 1 to calibrate, naturally it is also possible to selects other step value.
The embodiment of the present invention is on the basis of embodiment one, further describe the extreme point existence for autofocus evaluation function value to be specifically described with non-existent situation, extreme point not in the presence of, by preset range is further expanded, so that the present invention is while ensureing correction efficiency, the effective reliability ensureing correction.
Embodiment three:
Fig. 4 show the movement of the video camera that third embodiment of the invention provides after burnt skew bearing calibration realize flow process, details are as follows:
In step S401, set zoom motor and be in the position of prearranged multiple；
In step S402, described zoom motor, when the position of prearranged multiple, is moved in preset range by zoom motor, obtains autofocus evaluation function corresponding when described zoom motor moves；
In step S403, according to the extreme point of described autofocus evaluation function, determine the position of the zoom motor corresponding with described prearranged multiple according to described extreme point.
Step S401-S403 is essentially identical with step S201-S203 in embodiment one, is not repeated at this and repeats.
In step s 404, the extreme point of the autofocus evaluation function corresponding to position of the zoom motor of multiple different prearranged multiple is obtained.
Wherein, specifically describe in step S401-402 for the autofocus evaluation function corresponding to the position of the zoom motor of one of which prearranged multiple.In this step, in order to obtain the position of the zoom motor of multiple different prearranged multiple, it is only necessary to step S401-S402 is repeated several times.
It addition, in embodiments of the present invention, for the selection of described prearranged multiple, can according to zoom motor from WIDE wide-angle side to the change of TELE distant view end, the interval of the multiple of zoom motor institute zoom is the biggest.Such as, for multiple prearranged multiples, from WIDE end to TELE end, we can choose the parameter of following several zoom: 1X, 1.2X, 1.5X, 1.8X, 2.0X, 2.5X, 3.0X, 4X, 5X, 8X, 10X, 15X, 20X.For the camera lens of more focal length section, owing to the closer to TELE end, ZOOM motor position difference is the least, and therefore the interval of multiple can be increasing such that it is able to make to test highly efficient.
In step S405, determine the position of multiple zoom motor according to the extreme point of autofocus evaluation function corresponding to multiple different prearranged multiples.
Essentially identical with step S403, for different prearranged multiples, under corresponding acquisition different multiples, autofocus evaluation function value corresponding when zoom motor moves, and the position of the zoom motor after correction is determined according to the extreme point of autofocus evaluation function.
Additionally, when not finding the extreme point of described autofocus evaluation function in preset range, can be according to method described in embodiment two, according to predetermined ratio, described preset range is extended, obtain more autofocus evaluation function value, further the extreme point of autofocus evaluation function to be made a look up, thus obtain the position that zoom motor can clearly focus on accurately.
In step S406, the position of the plurality of zoom motor is fitted, generates the zoom zoom curve after correction.
Behind the position of the zoom motor obtained corresponding to the multiple of multiple zoom motor, can be by the way of matching, generate the focusing curve of zoom motor, according to described curve, such that it is able to adapt to the position of arbitrary zoom motor, search the correction position of the zoom motor of correspondence fast and accurately, and obtain image clearly, improve the stability that video camera uses.
Embodiment four:
Fig. 5 show the movement of the video camera that fourth embodiment of the invention provides after burnt skew correcting unit realize flow process, details are as follows:
The correcting unit of burnt skew after the movement of video camera described in the embodiment of the present invention, including:
Position setup unit 501, is in the position of prearranged multiple for setting zoom motor；
Function acquiring unit 502, when the described zoom motor position at prearranged multiple, is moved in preset range by zoom motor, obtains autofocus evaluation function corresponding when described zoom motor moves；
Position determination unit 503, for the extreme point according to described autofocus evaluation function, determines the position of the zoom motor corresponding with described prearranged multiple according to described extreme point.
Preferably, described position determination unit includes:
Extreme value judgment sub-unit, is used for judging whether described autofocus evaluation function extreme point occurs；
Primary importance determines subelement, for if there is extreme point, then determines the position of the zoom motor corresponding with described prearranged multiple according to described extreme point；
The second position determines subelement, for without there is extreme point, then increases the interval of predetermined ratio in described preset range, searches extreme point, determine the position of the zoom motor corresponding with described prearranged multiple according to described extreme point in the interval after increase.
Preferably, described device also includes:
Extreme point acquiring unit, for obtaining the extreme point of the autofocus evaluation function corresponding to position of the zoom motor of multiple different prearranged multiple；
Multiposition determines unit, and the extreme point for the autofocus evaluation function corresponding according to multiple different prearranged multiples determines the position of multiple zoom motor；
Fitting unit, for being fitted the position of the plurality of zoom motor, generates the zoom zoom curve after correction.
Preferably, the position of the zoom motor of the plurality of different prearranged multiples, according to zoom motor from WIDE wide-angle side to the change of TELE distant view end, the interval of the multiple of zoom motor institute zoom is the biggest.
Preferably, the region centered by the preset range of described zoom motor is by standard zoom position corresponding in the zoom zoom curve of standard.
The correcting unit of burnt skew after the movement of video camera described in the embodiment of the present invention, the bearing calibration of skew burnt with after the movement of video camera described in embodiment one to three is corresponding, is not repeated at this and repeats.
In several embodiments provided by the present invention, it should be understood that disclosed apparatus and method, can realize by another way.Such as, device embodiment described above is only schematically, such as, the division of described unit, be only a kind of logic function to divide, actual can have when realizing other dividing mode, the most multiple unit or assembly can in conjunction with or be desirably integrated into another system, or some features can ignore, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be the INDIRECT COUPLING by some interfaces, device or unit or communication connection, can be electrical, machinery or other form.
The described unit illustrated as separating component can be or may not be physically separate, and the parts shown as unit can be or may not be physical location, i.e. may be located at a place, or can also be distributed on multiple NE.Some or all of unit therein can be selected according to the actual needs to realize the purpose of the present embodiment scheme.
It addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it is also possible to be that unit is individually physically present, it is also possible to two or more unit are integrated in a unit.Above-mentioned integrated unit both can realize to use the form of hardware, it would however also be possible to employ the form of SFU software functional unit realizes.
If described integrated unit is using the form realization of SFU software functional unit and as independent production marketing or use, can be stored in a computer read/write memory medium.Based on such understanding, completely or partially can embodying with the form of software product of part that prior art is contributed by technical scheme the most in other words or this technical scheme, this computer software product is stored in a storage medium, including some instructions with so that a computer equipment (can be personal computer, server, or the network equipment etc.) perform all or part of of method described in each embodiment of the present invention.And aforesaid storage medium includes: USB flash disk, portable hard drive, read only memory (ROM, Read-OnlyMemory), the various media that can store program code such as random access memory (RAM, RandomAccessMemory), magnetic disc or CD.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, should be included within the scope of the present invention.
Claims (10)
1. the bearing calibration of burnt skew after the movement of a video camera, it is characterised in that described method includes:
Set zoom motor and be in the position of prearranged multiple；
Described zoom motor, when the position of prearranged multiple, is moved in preset range by zoom motor, obtains autofocus evaluation function corresponding when described zoom motor moves；
According to the extreme point of described autofocus evaluation function, determine the position of the zoom motor corresponding with described prearranged multiple according to described extreme point.
The most according to claim 1, method, it is characterised in that the described extreme point according to described autofocus evaluation function, determine that according to described extreme point the position step of the zoom motor corresponding with described prearranged multiple includes:
Judge whether described autofocus evaluation function extreme point occurs；
If there is extreme point, then determine the position of the zoom motor corresponding with described prearranged multiple according to described extreme point；
Without extreme point occurs, then in described preset range, increase the interval of predetermined ratio, search extreme point in the interval after increase, determine the position of the zoom motor corresponding with described prearranged multiple according to described extreme point.
Method the most according to claim 1, it is characterised in that described method also includes:
Obtain the extreme point of the autofocus evaluation function corresponding to position of the zoom motor of multiple different prearranged multiple；
Extreme point according to autofocus evaluation function corresponding to multiple different prearranged multiples determines the position of multiple zoom motor；
The position of the plurality of zoom motor is fitted, generates the zoom zoom curve after correction.
The most according to claim 3, method, it is characterised in that the position of the zoom motor of the plurality of different prearranged multiples, according to zoom motor from WIDE wide-angle side to the change of TELE distant view end, the interval of the multiple of zoom motor institute zoom is the biggest.
Method the most according to claim 1, it is characterised in that the preset range of described zoom motor be by standard zoom position corresponding in the zoom zoom curve of standard centered by region.
6. the correcting unit of burnt skew after the movement of a video camera, it is characterised in that described device includes:
Position setup unit, is in the position of prearranged multiple for setting zoom motor；
Function acquiring unit, when the described zoom motor position at prearranged multiple, is moved in preset range by zoom motor, obtains autofocus evaluation function corresponding when described zoom motor moves；
Position determination unit, for the extreme point according to described autofocus evaluation function, determines the position of the zoom motor corresponding with described prearranged multiple according to described extreme point.
Device the most according to claim 6, it is characterised in that described position determination unit includes:
Extreme value judgment sub-unit, is used for judging whether described autofocus evaluation function extreme point occurs；
Primary importance determines subelement, for if there is extreme point, then determines the position of the zoom motor corresponding with described prearranged multiple according to described extreme point；
The second position determines subelement, for without there is extreme point, then increases the interval of predetermined ratio in described preset range, searches extreme point, determine the position of the zoom motor corresponding with described prearranged multiple according to described extreme point in the interval after increase.
Device the most according to claim 6, it is characterised in that described device also includes:
Extreme point acquiring unit, for obtaining the extreme point of the autofocus evaluation function corresponding to position of the zoom motor of multiple different prearranged multiple；
Multiposition determines unit, and the extreme point for the autofocus evaluation function corresponding according to multiple different prearranged multiples determines the position of multiple zoom motor；
Fitting unit, for being fitted the position of the plurality of zoom motor, generates the zoom zoom curve after correction.
The most according to claim 8, device, it is characterised in that the position of the zoom motor of the plurality of different prearranged multiples, according to zoom motor from WIDE wide-angle side to the change of TELE distant view end, the interval of the multiple of zoom motor institute zoom is the biggest.
Device the most according to claim 6, it is characterised in that the preset range of described zoom motor be by standard zoom position corresponding in the zoom zoom curve of standard centered by region.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107071243A (en) * | 2017-03-09 | 2017-08-18 | 成都西纬科技有限公司 | Camera focus calibration system and focus calibration method |
| CN108259760A (en) * | 2018-03-22 | 2018-07-06 | 浙江大华技术股份有限公司 | A kind of zoom focus-compensating method and device of ball cover ball machine |
| CN109698902A (en) * | 2017-10-24 | 2019-04-30 | 华为技术有限公司 | A kind of synchronizing focus method and device |
| CN111147732A (en) * | 2018-11-06 | 2020-05-12 | 浙江宇视科技有限公司 | Focusing curve establishing method and device |
| CN114415329A (en) * | 2021-12-23 | 2022-04-29 | 山东神戎电子股份有限公司 | Method for improving focus clear point position offset of telephoto lens |
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| CN111147732B (en) * | 2018-11-06 | 2021-07-20 | 浙江宇视科技有限公司 | Focusing curve establishing method and device |
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