CN105787947A - Voice coil motor stroke calibration method and device and test fixture - Google Patents
Voice coil motor stroke calibration method and device and test fixture Download PDFInfo
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Abstract
The invention discloses a voice coil motor stroke calibration method and device and a test fixture. The method comprises the following steps: adjusting a focusing ring to determine MTF/SFR maximum value of a captured image, and taking a field angle corresponding to the maximum value as a target field angle; adjusting the focusing ring along a single direction enabling a lens to move along a film plane gradually; if the decrease amplitude of the MTF/SFR value corresponding to the current adjustment surpasses a preset value with respect to the maximum value, determining over-adjusted adjustment has implemented; and in the process of implementing the over-adjusted adjustment, judging the difference value between a field angle corresponding to the current adjustment and the target field angle is within the preset range, and if so, stopping adjusting the focusing ring and determining the lens position corresponding to the current adjustment to be a stroke start point of a voice coil motor. According to the method, device and the test tool, far-field focus position is allowed to keep away from the unstable region of the voice coil motor, thereby improving focusing accuracy and stability.
Description
Technical field
The present invention relates to the test calibration field of automatic focusing camera module, more particularly it relates to an for demarcating the method for voice coil motor start of a run of this kind of camera module, the device of a kind of voice coil motor start of a run for demarcating this kind of camera module and being provided with the measurement jig of this kind of device.
Background technology
At present, producing the manufacture carrying out camera module on line, most important manufacturing process is in that zooming section, if camera lens is not brought to position accurately, it will cause that imaging obscures.Wherein, focus also referred to as focusing, focus on, specifically refer to change image distance (i.e. camera lens photocentre to the distance of egative film plane), to obtain the adjustment process of this object sharply defined image.
Existing focusing calibration process is: be connected on measurement jig by camera module, and operate camera module, through capturing images tool, test drawing is carried out the acquisition of consecutive image, in this process, image distance is adjusted by focusing ring, often adjust once, measurement jig can record and show and utilize MTF or SFR to analyze the result that image obtains, if result reaches specification, then illustrate that namely correspondence position is pinpointed focus, otherwise then continue to adjust, and then calibrate diaphone coil motor (VoiceCoilMotor, the near burnt position of movement travel VCM) and remote burnt position, wherein, the corresponding maximum image distance in nearly burnt position, remote burnt position then corresponding minimum image from.
Fig. 1 illustrates the output characteristic curve of voice coil motor, wherein, vertical coordinate represents image distance P, abscissa represents the digital quantity value DAC driving electric current, span is 0～1023, according to Fig. 1, voice coil motor drives the stage of camera lens action to present non-linear output characteristic starting, namely VCM deposits the range of instability shown in broken box in the drawings, therefore, when utilizing above-mentioned focus adjustment method to demarcate movement travel, the remote burnt position P0 of correspondence course starting point is located exactly at the range of instability of voice coil motor, this will appear from focusing instability, inaccurate phenomenon, simultaneously, will also result in the problem that when user uses, auto-focusing detection is unstable.
Summary of the invention
One purpose of the embodiment of the present invention is to provide the new solution of the start of a run of a kind of voice coil motor for demarcating automatic focusing camera module, to improve focusing Stability and veracity when test, use camera module.
According to the first aspect of the invention, it is provided that a kind of method demarcating voice coil motor stroke, comprising:
In the whole adjustment angular range of focusing ring, determine, by adjusting focusing ring, the MTF/SFR maximum being subtracted image, and the angle of visual field of corresponding described MTF/SFR maximum is as field of regard angle；
After determining MTF/SFR maximum, in remote burnt region along making camera lens progressively adjust focusing ring towards the single direction of egative film plane motion, to be first determined the adjustment of toning, then it is carried out the adjustment of toning；
When the adjustment being determined toning:
Calculate the corresponding current MTF/SFR value being subtracted image adjusted；
Judge whether the fall of the corresponding current relatively described MTF/SFR maximum of MTF/SFR value adjusted exceedes preset value, in this way, it is determined that have started to implement the adjustment of toning；
When the adjustment being carried out toning:
Judge that the difference at the corresponding current angle of visual field adjusted and described field of regard angle is whether in preset range, in this way, then stop continuing to adjust focusing ring, and determine the corresponding current start of a run that lens location is voice coil motor adjusted, wherein, the lower limit of described preset range makes lens location produce the distance inelastic region length more than voice coil motor of described difference, and the higher limit of described preset range makes nearly burnt position be still located in the maximum travel limit of voice coil motor.
Preferably, in remote burnt region along when making camera lens progressively adjust focusing ring close to the single direction of egative film plane, adjust focusing ring with default fixed angle or level altitude every time.
Preferably, the described angle of visual field is diagonal field of view angle.
Preferably, described determining the MTF/SFR maximum being subtracted image by adjusting focusing ring, and the angle of visual field of corresponding described MTF/SFR maximum includes as field of regard angle:
Often adjust once, calculate the corresponding current MTF/SFR value adjusted and the angle of visual field, and record the corresponding relation between described MTF/SFR value and the described angle of visual field.
Preferably, the described corresponding relation that records between described MTF/SFR value and the described angle of visual field is further:
The synopsis of the corresponding relation between reflection MTF/SFR value and the angle of visual field records described MTF/SFR value and the described angle of visual field.
According to a second aspect of the present invention, it is provided that a kind of device demarcating voice coil motor stroke, comprising:
First computing module, for adjusting in the process of focusing ring in whole adjustment angular range, calculates the angle of visual field of the lens location of the corresponding current MTF/SFR value being subtracted image adjusted and corresponding current adjustment；
Benchmark determines module, for according to the described first calculated result of computing module, it is determined that the angle of visual field of MTF/SFR maximum and corresponding MTF/SFR maximum is as field of regard angle；
Second computing module, for after determining described MTF/SFR maximum, in remote burnt region along making the camera lens single direction towards egative film plane motion progressively adjust focusing ring, to be first determined the adjustment of toning time, calculate the corresponding current MTF/SFR value being subtracted image adjusted；
Toning judge module, for the result of calculation according to described second computing module, it is judged that whether the fall of the corresponding current relatively described MTF/SFR maximum of MTF/SFR value adjusted exceedes preset value, in this way, it is determined that have started to implement the adjustment of toning；
3rd computing module, for progressively adjusting focusing ring at described single direction, when being carried out the adjustment of toning, calculates the corresponding current angle of visual field adjusted later；And,
Stroke demarcating module, for the result of calculation according to described 3rd computing module, judge that the difference at the corresponding current angle of visual field adjusted and described field of regard angle is whether in preset range, in this way, then output stops continuing to adjust signal, and determine the corresponding current start of a run that lens location is voice coil motor adjusted, wherein, the lower limit of described preset range makes lens location produce the distance inelastic region length more than voice coil motor of described difference, and the higher limit of described preset range makes nearly burnt position be still located in the maximum travel limit of voice coil motor.
Preferably, the described angle of visual field is diagonal field of view angle.
Preferably, described device also includes logging modle, and described logging modle is for corresponding relation between MTF/SFR value and the described angle of visual field according to the result of calculation record of described first computing module, and is supplied to described benchmark and determines module.
Preferably, the described logging modle synopsis specifically for the corresponding relation between reflection MTF/SFR value and the angle of visual field records described MTF/SFR value and the described angle of visual field.
According to a third aspect of the present invention, providing a kind of measurement jig, it includes the device demarcating voice coil motor stroke described in any of the above-described kind, for presenting the display device of the calculated data of described device and calibration result and continuing, for stopping of export according to described stroke demarcating module, the suggestion device that adjustment signal carries out pointing out.
It was found by the inventors of the present invention that in the prior art, there is the stroke of demarcation and make the remote burnt position of camera module cannot avoid the problem of range of instability of voice coil motor.Therefore, technical assignment that the present invention to realize or that the those skilled in the art of technical problem is that to be solved never expect or it is not expected that, therefore the present invention is a kind of new technical scheme.
One of the present invention has the beneficial effects that, the present invention demarcates the method for voice coil motor stroke, device and measurement jig employing and carries out overwinding to determine the scheme of start of a run when searching remote burnt position, and then make remote burnt position be positioned at the stroke range of demarcation, and the length of distance start of a run can avoid the range of instability of voice coil motor just, so, just ensure that test and use procedure are to remote burnt Stability and veracity.
By referring to the accompanying drawing detailed description to the exemplary embodiment of the present invention, the further feature of the present invention and advantage thereof will be made apparent from.
Accompanying drawing explanation
Combined in the description and the accompanying drawing of the part constituting description illustrate embodiments of the invention, and be used for explaining principles of the invention together with its explanation.
Fig. 1 illustrates the output characteristic curve of voice coil motor；
Fig. 2 is the flow chart of a kind of embodiment of the method demarcating voice coil motor stroke according to the present invention；
Fig. 3 illustrates that the angle of visual field and MTF/SFR value are with the curve adjusting angle change along when making camera lens progressively adjust adjustment ring close to the single direction of egative film plane；
Fig. 4 is a kind of frame principle figure implementing structure of the device demarcating voice coil motor stroke according to the present invention；
Fig. 5 is a kind of frame principle figure implementing structure according to measurement jig of the present invention.
Detailed description of the invention
The various exemplary embodiments of the present invention are described in detail now with reference to accompanying drawing.It should also be noted that unless specifically stated otherwise, the parts otherwise set forth in these embodiments and positioned opposite, the numerical expression of step and numerical value do not limit the scope of the invention.
Description only actually at least one exemplary embodiment is illustrative below, never as any restriction to the present invention and application or use.
The known technology of person of ordinary skill in the relevant, method and apparatus are likely to be not discussed in detail, but in the appropriate case, described technology, method and apparatus should be considered a part for description.
Shown here with in all examples discussed, any occurrence should be construed as merely exemplary, not as restriction.Therefore, other example of exemplary embodiment can have different values.
It should also be noted that similar label and letter below figure represent similar terms, therefore, once a certain Xiang Yi accompanying drawing is defined, then it need not be further discussed in accompanying drawing subsequently.
The present invention is to solve that demarcating, according to existing focusing scaling method, the stroke that obtains makes the remote burnt position of camera module cannot avoid the problem of range of instability of voice coil motor, provide a kind of method for demarcating voice coil motor stroke, the method specifically refers to the method demarcating voice coil motor start of a run, and the method demarcating voice coil motor stroke end still can adopt method existing, that undertaken demarcating by the nearly burnt position of search.
Fig. 2 illustrates a kind of embodiment of the method demarcating voice coil motor stroke according to the present invention, and according to Fig. 2, the method comprises the steps:
Step S201: in the whole adjustment angular range of focusing ring, determines, by adjusting focusing ring, the MTF/SFR maximum being subtracted image, and the angle of visual field of corresponding described MTF/SFR maximum is as field of regard angle.
Above-mentioned steps S201 is the step obtaining determinating reference, and this determinating reference is MTF/SFR maximum and field of regard angle.
The step of this acquisition determinating reference can farther include:
Often adjust once, calculate the corresponding current MTF/SFR value being subtracted image adjusted and calculate the corresponding current angle of visual field adjusted, and recording the corresponding relation between MTF/SFR value and the angle of visual field, in order to searching the angle of visual field of corresponding MTF/SFR maximum.
And in order to conveniently store and search these data, specifically also between reflection MTF/SFR value and the angle of visual field, the synopsis of corresponding relation can record calculated MTF/SFR value and the angle of visual field.
When carrying out the step obtaining determinating reference, could be arranged to the angle every time adjusted according to detection case accommodation, such as, if MTF/SFR value is much smaller than maximum reference value, bigger angle can be adjusted every time, and when if MTF/SFR value is closer to maximum reference value, it is possible to adjust less angle every time；Can also preset and adjust focusing ring with fixed angle every time.
Above-mentioned MTF is modulation transfer function (MTF) (ModulationTransferFunction), it is for evaluating optical imaging system aggregative indicator, represent be image after camera imaging contrast and imaging before original image or the ratio of contrast of material object, it it is the most comprehensive criterion during all Performance of Optical System judge, and mtf value is and utilizes MTF analysis to be subtracted the numerical value that image obtains, accordingly, MTF maximum is and utilizes MTF to analyze the maximum being subtracted in the numerical value that image obtains.
Above-mentioned SFR is spatial frequency response (SpatialFrequencyResponse), it refers to that imaging device corresponds to the amplitude response of spatial frequency, can be used for differentiating the resolution of camera, and SFR value is and utilizes SFR analysis to be subtracted the numerical value that image obtains, SFR maximum is and utilizes SFR to analyze the maximum being subtracted in the numerical value that image obtains.
The above-mentioned angle of visual field can be actual angle of visual field numerical value, it is also possible to be able to characterize the numerical value of angle of visual field change.
The angle of visual field (represents) reflection camera lens scope of imaging clearly in egative film plane typically by FOV, and it can adopt equation below (1) to calculate:
FOV=2arctg (S/P) formula (1)
Wherein, parameter S is the half of egative film plane length, and parameter P is the distance between camera lens and egative film plane, i.e. image distance.
Diagonal field of view angle (representing typically by DFOV) can also be calculated, should be the half of the catercorner length of egative film plane for DFOV, above-mentioned parameter S.
For the ease of obtaining the parameter for calculating the angle of visual field, it is also possible to adopt equation below (2) to calculate the numerical value FOV ' that can characterize the angle of visual field:
FOV '=2arctg (O/D) formula (2)
Wherein, parameter O represents the corresponding current width being ingested on image object adjusted, and parameter D represents the distance between test board and camera lens.
After determining MTF/SFR maximum, start to determine the adjustment of toning and process, namely perform following steps S202 to step S204.
Step S202: in remote burnt region along making the camera lens single direction towards egative film plane motion adjust focusing ring, perform step S203 afterwards.
This remote burnt region is corresponding region that search remote burnt position, that be closer to egative film plane.
Step S203: calculate the corresponding current MTF/SFR value being subtracted image adjusted, perform step S204 afterwards.
Step S204: judge whether the fall of the corresponding current relative MTF/SFR maximum of MTF/SFR value adjusted exceedes preset value, in this way, it is determined that have started to implement the adjustment of toning；As no, then proceed to determine adjustment and the process of toning.
Fig. 3 illustrates in the process adjusting focusing ring along above-mentioned single direction, the angle of visual field and MTF/SFR value are with the curve adjusting angle change, adjust the central angle that angle refers to that on focusing ring, the current location of selected adjustment point is corresponding with initial position, it is inversely proportional to the selected height adjusting point, wherein, in figure, solid line is that the angle of visual field is with the curve adjusting angle change, the curve that in figure, dotted line then changes with adjustment angle for MTF/SFR value.
According to Fig. 3, in the process adjusting focusing ring along this single direction, MTF/SFR value is in the trend being gradually increased, if MTF/SFR value continues to adjust focusing ring after reaching peak value, then MTF/SFR value will be the trend being gradually reduced, at this moment theoretic toning action has begun to, and the lens location that MTF/SFR maximum is corresponding is the pinpointed focus in remote burnt region, i.e. remote burnt position.Therefore, above-mentioned fall refers to the process after basically reaching MTF/SFR maximum for the current MTF/SFR value adjusted.
In carrying out this adjustment process, although the variation tendency of MTF/SFR value is to be gradually reduced after reaching peak value, but, owing in testing in reality, the MTF/SFR value of corresponding same lens location can fluctuate within the specific limits, therefore, if starting to reduce as determining the condition having started to implement toning adjustment using MTF/SFR value, then will necessarily affect the Stability and veracity of result of determination.Again owing to MTF/SFR value has obvious reduction after exceeding remote burnt position, therefore, the present invention exceedes preset value as determining that the condition having started to implement toning adjustment will substantially ensure that the Stability and veracity of result of determination using the fall of the relative MTF/SFR maximum of MTF/SFR value.Above-mentioned preset value then can set according to the minima of MTF/SFR difference between blur-free imaging and non-blur-free imaging.
And according to Fig. 3 and above-mentioned formula (1) it can be seen that in the process adjusting focusing ring clockwise, the angle of visual field is all the time in increase tendency.
After determining the adjustment coming into effect toning, it is carried out adjustment and the process of toning, namely performs following steps S205 to step S208.
Step S205: calculate the corresponding current angle of visual field adjusted, perform step S206 afterwards.
Step S206: judge that the difference between the corresponding current angle of visual field adjusted and field of regard angle is whether in preset range, then performs step S207 in this way, as no, then perform step S208.
The lower limit of above-mentioned preset range makes lens location produce the distance inelastic region length more than voice coil motor of described difference, so that voice coil motor is when driving camera motion to remote burnt position, have been detached from its range of instability, so, all strokes of the remote burnt position of camera module to nearly burnt position are by within the scope of the linear zone being respectively positioned on voice coil motor, and then can effectively ensure that the Stability and veracity of focus operation；And the higher limit of this preset range makes nearly burnt position be still located in the maximum travel limit of voice coil motor, to guarantee to prepare to demarcate nearly burnt position.
According to the above description it can be seen that the lower limit of preset range can change the relation setting between image distance interval according to the inelastic region length of diaphone coil motor and the angle of visual field, referring specifically to formula (1)；The higher limit of preset range then can set according to the reference distance between nearly burnt position and remote burnt position and maximum travel limit.
Step S207: stop continuing to adjust focusing ring, and determine the corresponding current start of a run that lens location is voice coil motor adjusted.
Step S208: continue to adjust focusing ring along above-mentioned single direction, and continue above-mentioned steps S205.
The above-mentioned action adjusting focusing ring can be manually completed by operator, it is possible to is automatically performed by configuring mechanical hand for measurement jig.
Fig. 4 illustrates a kind of frame principle figure implementing structure of the device demarcating voice coil motor stroke according to the present invention, and this device 400 includes the first computing module 401, benchmark determines module the 402, second computing module 403, toning judge module the 404, the 3rd computing module 405, stroke demarcating module 406.
Above-mentioned first computing module 401, for adjusting in whole adjustment angular range in the process of focusing ring, calculates the angle of visual field of the lens location of the corresponding current MTF/SFR value being subtracted image adjusted and corresponding current adjustment.
This first computing module 401 can carry out above-mentioned calculating according to adjusting in whole adjustment angular range the first computations received in the process of focusing ring, namely often adjusts and once will receive first computations.
Said reference determines that module 402 is for according to the first calculated result of computing module 401, it is determined that the angle of visual field of MTF/SFR maximum and corresponding MTF/SFR maximum is as field of regard angle.
Above-mentioned second computing module 403 is for after benchmark determines that module 402 determines MTF/SFR maximum, in remote burnt region along making the camera lens single direction towards egative film plane motion progressively adjust focusing ring, to be first determined the adjustment of toning time, calculate the corresponding current MTF/SFR value being subtracted image adjusted.
This second computing module 403 can carry out above-mentioned calculating according to the second computations received when the adjustment being determined toning, namely often once determines that the adjustment of toning will receive second computations.
Toning judge module 404 is for the result of calculation according to the second computing module 403, it is judged that whether the fall of the corresponding current relative MTF/SFR maximum of MTF/SFR value adjusted exceedes preset value, in this way, it is determined that have started to implement the adjustment of toning.
3rd computing module 405, for progressively adjusting focusing ring at above-mentioned single direction, when being carried out the adjustment of toning later, calculates the corresponding current angle of visual field adjusted.
3rd computing module 405 can carry out above-mentioned calculating according to the 3rd computations received when the adjustment being carried out toning, and the adjustment namely often once implementing toning will receive order three computationses.
Stroke demarcating module 406 is for the result of calculation according to the 3rd computing module 405, judge that the difference at the corresponding current angle of visual field adjusted and described field of regard angle is whether in preset range, in this way, then output stops continuing to adjust signal, and determine the corresponding current start of a run that lens location is voice coil motor adjusted, wherein, the lower limit of this preset range makes lens location produce the distance inelastic region length more than voice coil motor of described difference, and the higher limit of described preset range makes nearly burnt position be still located in the maximum travel limit of voice coil motor.
Fig. 5 illustrates a kind of frame principle figure implementing structure according to measurement jig of the present invention, and this measurement jig includes said apparatus 400, for presenting the display device 501 of the calculated data of device 400 and calibration result and continuing to adjust signal for stopping of exporting according to stroke demarcating module 406 and carry out the suggestion device 502 pointed out.
Above-mentioned suggestion device 502 is such as by the device of sound and/or flashing indicating.
It addition, this measurement jig can also include interface arrangement, communicator, input equipment etc..Interface arrangement such as includes USB interface, RS232 interface, RS485 interface etc..Communicator such as can carry out there is wired or wireless communication.Input equipment such as can include touch screen, keyboard etc..
The various embodiments described above primary focus describes the difference with other embodiments, but it will be clear for those skilled in the art that the various embodiments described above can be used alone as required or be combined with each other.
Each embodiment in this specification all adopts the mode gone forward one by one to describe, identical similar part cross-reference between each embodiment, what each embodiment stressed is the difference with other embodiments, but it will be clear for those skilled in the art that the various embodiments described above can be used alone as required or be combined with each other.It addition, for device embodiment, owing to it is corresponding with embodiment of the method, so describing fairly simple, relevant part is referring to the explanation of the corresponding part of embodiment of the method.System embodiment described above is merely schematic, and the module wherein illustrated as separating component can be or may not be physically separate.
The present invention can be device, method and/or computer program.Computer program can include computer-readable recording medium, containing for making processor realize the computer-readable program instructions of various aspects of the invention.
Computer-readable recording medium can be the tangible device that can keep and store and be performed the instruction that equipment uses by instruction.Computer-readable recording medium such as may be-but not limited to-the combination of storage device electric, magnetic storage apparatus, light storage device, electromagnetism storage device, semiconductor memory apparatus or above-mentioned any appropriate.The example more specifically (non exhaustive list) of computer-readable recording medium includes: portable computer diskette, hard disk, random access memory (RAM), read only memory (ROM), erasable type programmable read only memory (EPROM or flash memory), static RAM (SRAM), Portable compressed dish read only memory (CD-ROM), digital versatile disc (DVD), memory stick, floppy disk, mechanical coding equipment, such as on it, storage has punch card or the groove internal projection structure of instruction, and the combination of above-mentioned any appropriate.Computer-readable recording medium used herein above is not construed as instantaneous signal itself, the electromagnetic wave of such as radio wave or other Free propagations, the electromagnetic wave (such as, by the light pulse of fiber optic cables) propagated by waveguide or other transmission mediums or by the signal of telecommunication of wire transfer.
Computer-readable program instructions as described herein can download to each from computer-readable recording medium and calculate/process equipment, or downloaded to outer computer or External memory equipment by network, such as the Internet, LAN, wide area network and/or wireless network.Network can include copper transmission cable, fiber-optic transfer, is wirelessly transferred, router, fire wall, switch, gateway computer and/or Edge Server.Adapter or network interface in each calculating/process equipment receive computer-readable program instructions from network, and forward this computer-readable program instructions, for be stored in each calculate/process equipment in computer-readable recording medium in.
Can be the source code write of assembly instruction, instruction set architecture (ISA) instruction, machine instruction, machine-dependent instructions, microcode, firmware instructions, condition setup data or the combination in any with one or more programming languages or object code for performing the computer program instructions of present invention operation, described programming language includes OO programming language such as Smalltalk, C++ etc. and the procedural programming languages of routine such as " C " language or similar programming language.Computer-readable program instructions fully can perform on the user computer, partly performs on the user computer, performs as an independent software kit, partly partly perform on the remote computer on the user computer or perform on remote computer or server completely.In the situation relating to remote computer, remote computer can include LAN (LAN) by the network of any kind or wide area network (WAN) is connected to subscriber computer, or, it may be connected to outer computer (such as utilizes ISP to pass through Internet connection).In certain embodiments, by utilizing the status information of computer-readable program instructions to carry out personalized customization electronic circuit, such as Programmable Logic Device, field programmable gate array (FPGA) or programmable logic array (PLA), this electronic circuit can perform computer-readable program instructions, thus realizing various aspects of the invention.
Flow chart and/or block diagram referring herein to method according to embodiments of the present invention, device (system) and computer program describe various aspects of the invention.Should be appreciated that the combination of each square frame in each square frame of flow chart and/or block diagram and flow chart and/or block diagram, can be realized by computer-readable program instructions.
These computer-readable program instructions can be supplied to general purpose computer, special-purpose computer or other programmable data and process the processor of device, thus producing a kind of machine, make these instructions when the processor being processed device by computer or other programmable data is performed, create the device of the function/action of regulation in the one or more square frames in flowchart and/or block diagram.These computer-readable program instructions can also be stored in a computer-readable storage medium, these instructions make computer, programmable data process device and/or other equipment works in a specific way, thus, storage has the computer-readable medium of instruction then to include a manufacture, and it includes the instruction of the various aspects of the function/action of regulation in the one or more square frames in flowchart and/or block diagram.
Computer-readable program instructions can also be loaded into computer, other programmable data processes on device or miscellaneous equipment, make to process at computer, other programmable data device or miscellaneous equipment perform sequence of operations step, to produce computer implemented process, so that process the function/action of regulation in the one or more square frames in the instruction flowchart and/or block diagram performed on device or miscellaneous equipment at computer, other programmable data.
Flow chart and block diagram in accompanying drawing show according to the system of multiple embodiments of the present invention, the architectural framework in the cards of method and computer program product, function and operation.In this, flow chart or each square frame in block diagram can represent a part for a module, program segment or instruction, and a part for described module, program segment or instruction comprises the executable instruction of one or more logic function for realizing regulation.At some as in the realization replaced, the function marked in square frame can also to be different from the order generation marked in accompanying drawing.Such as, two continuous print square frames can essentially perform substantially in parallel, and they can also perform sometimes in the opposite order, and this determines according to involved function.It will also be noted that, the combination of the square frame in each square frame in block diagram and/or flow chart and block diagram and/or flow chart, can realize by the special hardware based system of the function or action that perform regulation, or can realize with the combination of specialized hardware Yu computer instruction.It is well known that to those skilled in the art, the mode realized by hardware mode, being realized by software mode and being combined by software and hardware realizes being all of equal value.
Being described above various embodiments of the present invention, described above is illustrative of, and non-exclusive, and it is also not necessarily limited to disclosed each embodiment.When not necessarily departing from the scope and spirit of illustrated each embodiment, many modifications and changes will be apparent from for those skilled in the art.The selection of term used herein, it is intended to explain the principle of each embodiment, practical application or the technological improvement to the technology in market best, or make other those of ordinary skill of the art be understood that each embodiment disclosed herein.The scope of the present invention be defined by the appended claims.
Claims (10)
1. the method demarcating voice coil motor stroke, it is characterised in that including:
In the whole adjustment angular range of focusing ring, determine, by adjusting focusing ring, the MTF/SFR maximum being subtracted image, and the angle of visual field of corresponding described MTF/SFR maximum is as field of regard angle；
After determining MTF/SFR maximum, in remote burnt region along making camera lens progressively adjust focusing ring towards the single direction of egative film plane motion, to be first determined the adjustment of toning, then it is carried out the adjustment of toning；
When the adjustment being determined toning:
Calculate the corresponding current MTF/SFR value being subtracted image adjusted；
Judge whether the fall of the corresponding current relatively described MTF/SFR maximum of MTF/SFR value adjusted exceedes preset value, in this way, it is determined that have started to implement the adjustment of toning；
When the adjustment being carried out toning:
Judge that the difference at the corresponding current angle of visual field adjusted and described field of regard angle is whether in preset range, in this way, then stop continuing to adjust focusing ring, and determine the corresponding current start of a run that lens location is voice coil motor adjusted, wherein, the lower limit of described preset range makes lens location produce the distance inelastic region length more than voice coil motor of described difference, and the higher limit of described preset range makes nearly burnt position be still located in the maximum travel limit of voice coil motor.
2. method according to claim 1, it is characterised in that in remote burnt region along when making the camera lens single direction towards egative film plane motion progressively adjust focusing ring, every time adjust focusing ring with default fixed angle or level altitude.
3. method according to claim 1, it is characterised in that the described angle of visual field is diagonal field of view angle.
4. method according to claim 1, it is characterised in that described determine the MTF/SFR maximum being subtracted image by adjusting focusing ring, and the angle of visual field of corresponding described MTF/SFR maximum includes as field of regard angle:
Often adjust once, calculate the corresponding current MTF/SFR value adjusted and the angle of visual field, and record the corresponding relation between described MTF/SFR value and the described angle of visual field.
5. method according to claim 4, it is characterised in that the described corresponding relation that records between described MTF/SFR value and the described angle of visual field is further:
The synopsis of the corresponding relation between reflection MTF/SFR value and the angle of visual field records described MTF/SFR value and the described angle of visual field.
6. the device demarcating voice coil motor stroke, it is characterised in that including:
First computing module, for adjusting in the process of focusing ring in whole adjustment angular range, calculates the angle of visual field of the lens location of the corresponding current MTF/SFR value being subtracted image adjusted and corresponding current adjustment；
Benchmark determines module, for according to the described first calculated result of computing module, it is determined that the angle of visual field of MTF/SFR maximum and corresponding MTF/SFR maximum is as field of regard angle；
Second computing module, for after determining described MTF/SFR maximum, in remote burnt region along making the camera lens single direction towards egative film plane motion progressively adjust focusing ring, to be first determined the adjustment of toning time, calculate the corresponding current MTF/SFR value being subtracted image adjusted；
Toning judge module, for the result of calculation according to described second computing module, it is judged that whether the fall of the corresponding current relatively described MTF/SFR maximum of MTF/SFR value adjusted exceedes preset value, in this way, it is determined that have started to implement the adjustment of toning；
3rd computing module, for progressively adjusting focusing ring at described single direction, when being carried out the adjustment of toning, calculates the corresponding current angle of visual field adjusted later；And,
Stroke demarcating module, for the result of calculation according to described 3rd computing module, judge that the difference at the corresponding current angle of visual field adjusted and described field of regard angle is whether in preset range, in this way, then output stops continuing to adjust signal, and determine the corresponding current start of a run that lens location is voice coil motor adjusted, wherein, the lower limit of described preset range makes lens location produce the distance inelastic region length more than voice coil motor of described difference, and the higher limit of described preset range makes nearly burnt position be still located in the maximum travel limit of voice coil motor.
7. device according to claim 6, it is characterised in that the described angle of visual field is diagonal field of view angle.
8. device according to claim 6, it is characterized in that, described device also includes logging modle, and described logging modle is for corresponding relation between MTF/SFR value and the described angle of visual field according to the result of calculation record of described first computing module, and is supplied to described benchmark and determines module.
9. device according to claim 8, it is characterised in that described logging modle records described MTF/SFR value and the described angle of visual field in the synopsis specifically for the corresponding relation between reflection MTF/SFR value and the angle of visual field.
10. the measurement jig for camera model, it is characterized in that, including the device according to any one of claim 5 to 8, for presenting the display device of the calculated data of described device and calibration result and stopping, for what export according to described stroke demarcating module, the suggestion device that continuation adjustment signal carries out pointing out.
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