CN103048766A - Automatic focusing method and automatic focusing device - Google Patents
Automatic focusing method and automatic focusing device Download PDFInfo
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- CN103048766A CN103048766A CN2013100277043A CN201310027704A CN103048766A CN 103048766 A CN103048766 A CN 103048766A CN 2013100277043 A CN2013100277043 A CN 2013100277043A CN 201310027704 A CN201310027704 A CN 201310027704A CN 103048766 A CN103048766 A CN 103048766A
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Abstract
The embodiment of the invention relates to an automatic focusing method and an automatic focusing device. The automatic focusing method comprises the steps of: searching a step-length coefficient under the current aperture parameter of a lens according to a formula that the step-length coefficient is equal to the current aperture parameter/a datum aperture parameter; obtaining a focusing value of the current step of the lens, calculating a change rate between the focusing value of the current step and a previous maximum focusing value according to a formula that the change rate is equal to the focusing value of the current step/the previous maximum focusing value, and obtaining the length of a next step according to the change rate; calculating the product of the step-length coefficient and the length of the next step, and taking the product as an adjusting step length; moving the lens according to the adjusting step length to reach the position of the next step of the lens; and repeating from the step of searching the step-length coefficient under the current aperture parameter of the lens to the step of moving the lens to reach the position of the next step till the lens reaches the focusing position. According to the automatic focusing method and the automatic focusing device, provided by the invention, the searching step length is determined by simultaneously considering the optical characteristic of a head of the lens and the influence on the focusing position caused by a practical scene according to the two factors, so that the searching speed is effectively increased.
Description
Technical field
The present invention relates to communication equipment field, relate in particular to a kind of auto focusing method and device.
Background technology
The maximum image planes shift position that allows when depth of focus is imaging, image planes are mobile in focal depth range, and image quality does not change, thereby as long as focus drops on and is focusing in the focal depth range.Focus value is an index of measurement system out of focus degree, calculated according to the picture material that photographs by sharpness evaluation function (SEF, Sharpness Evaluation Function), focus value is larger, illustrate that out of focus is less, lens from focal position more close to.Drive condenser lens by stepper motor, movably searching in the scope, whenever move to a position, a two field picture of getting current shooting calculates focus value, and when focus value reached maximal value, the lens position was optimal location, i.e. focal position.In order to accelerate search speed, find as early as possible focal position, usually can adopt RS(Rule-Based Search), namely rule-based searching algorithm is searched focal position.The RS searching algorithm is divided into three districts with the hunting zone: the coarse adjustment steps field of search, and in this zone, find the probability of focal position minimum, step-size in search is set to 7-10 motor minimum step; Medium step length searching district finds the probability of focal position lower in this zone, and step-size in search is set to 3-4 motor minimum step; Meticulous step length searching district finds the maximum probability of focal position in this zone, step-size in search is set to the motor minimum step in this zone.
The RS searching algorithm of prior art has only been considered the impact of actual scene on the search focal position, but does not consider the optical characteristics of lens to the impact of search focal position, and when the optical characteristics of lens changed, search speed significantly reduced.
Summary of the invention
The present invention seeks to propose a kind of auto focusing method and device, be intended to solve the traditional focus method and only consider that actual scene is on the impact of step-size in search, and do not consider that the lens optical parameter changes the impact on step-size in search, thereby so that search speed reaches the poor problem of search precision slowly.
For achieving the above object, on the one hand, a kind of auto focusing method is provided, described method comprises: according to formula: step-length coefficient=current aperture parameters/benchmark aperture parameters, search the step-length coefficient under the current aperture parameters of lens, wherein, described current aperture parameters be described lens in the aperture parameters of current position, described benchmark aperture parameters is the aperture parameters that sets in advance; Obtain the focus value in current step of lens, according to formula: the focus value in rate of change=current step/front once maximum focus value, calculate before the focus value in described current step of lens and the lens the once rate of change of maximum focus value, according to next step step-length of acquiring size of described rate of change; Calculate the product of described step-length coefficient and described next step step-length, and with described product as adjusting step-length; Move described lens according to described adjustment step-length, arrive next step position of described lens; Repeat to arrive from the step-length coefficient under the described current aperture parameters of searching lens to mobile described lens the above-mentioned steps of next step position, until the focal position of described lens.
On the other hand, a kind of automatic focusing system has also been proposed, described device comprises: search the unit, be used for according to formula: step-length coefficient=current aperture parameters/benchmark aperture parameters, search the step-length coefficient under the current aperture parameters of lens, wherein, described current aperture parameters be described lens in the aperture parameters of current position, described benchmark aperture parameters is the aperture parameters that sets in advance; Acquiring unit, be used for obtaining the focus value in current step of lens, according to formula: the focus value in rate of change=current step/front once maximum focus value, calculate before the focus value in described current step of lens and the lens the once rate of change of maximum focus value, according to next step step-length of acquiring size of described rate of change; The first computing unit is used for calculating the product of described step-length coefficient and described next step step-length, and with described product as the adjustment step-length; Mobile unit is used for moving described lens according to described adjustment step-length, arrives next step position of described lens; The circular treatment unit is used for repeating arriving from the step-length coefficient under the described current aperture parameters of searching lens to mobile described lens the above-mentioned steps of next step position, until the focal position of described lens.
The auto focusing method that the embodiment of the invention proposes and device, optical characteristics by considering simultaneously lens and actual scene are on the impact of search focal position, determine step-size in search according to these two factors, thus Effective Raise search speed and search precision.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is embodiment of the invention auto focusing method process flow diagram;
Fig. 2 is the sequential chart of embodiment of the invention auto focusing method;
Fig. 3 is the synoptic diagram of embodiment of the invention automatic focusing system.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the performing creative labour prerequisite.
Fig. 1 is embodiment of the invention auto focusing method process flow diagram, and as shown in Figure 1, the auto focusing method that the embodiment of the invention proposes specifically comprises the steps:
Step 101: according to formula: step-length coefficient=current aperture parameters/benchmark aperture parameters, search the step-length coefficient under the current aperture parameters of lens, wherein, described current aperture parameters be described lens in the aperture parameters of current position, described benchmark aperture parameters is the aperture parameters that sets in advance.
Concrete, the optical parametric of lens can produce certain impact to the focal position of lens, thereby in the process of search lens focus position, should consider that the optical parametric of lens is on the impact of step-size in search, the optical parametric of scioptics is determined a step-length coefficient, step-size in search is adjusted, thereby fast search is to correct focal position.
The step-length coefficient can be searched according to the aperture parameters of lens and the funtcional relationship between the step-length coefficient, and is concrete, can search according to following formula:
Step-length coefficient=current aperture parameters/benchmark aperture parameters (1)
Wherein, current aperture parameters be lens in the aperture parameters of current position, the benchmark aperture parameters is the aperture parameters that sets in advance.The benchmark aperture parameters can be determined according to environment for use, for example, determines according to the lens location under the most frequently used environment and aperture size.After definite some aperture parameters are the benchmark aperture parameters, as long as know the current aperture parameters of lens, then just can obtain step-length coefficient under the current aperture parameters of lens according to formula (1).
Need to prove that the current aperture parameters of lens can be obtained according to following formula:
Current aperture parameters=focal length/entrance pupil diameter (2)
Its mid-focal length can be according to the position acquisition of the focus-variable lens of lens; The entrance pupil diameter be aperture diaphragm to the diameter of the optical system imaging of its front, the entrance pupil diameter can be according to the acquiring size of lens stop opening.
Step 102: the focus value of obtaining the current step of lens, according to formula: the focus value in rate of change=current step/front once maximum focus value, calculate before the focus value in described current step of lens and the lens the once rate of change of maximum focus value, according to next step step-length of acquiring size of described rate of change.
Concrete, the focus value in current step of lens can obtain in the image calculation of current position shooting by scioptics, for example, utilizes sharpness evaluation function to calculate the focus value in current step of lens according to the picture material that photographs, these computing method are known technology in the industry, repeat no more herein.
Calculate before the focus value in current step of lens and the lens the once rate of change of maximum focus value by following formula:
The focus value in rate of change=current step/front once maximum focus value (3)
Wherein, front once maximum focus value is that lens are lower in equivalent environment, the focus value that obtains in this position when finding focal position in the front search procedure.Because lens are under equivalent environment, the focus value during focusing is more or less the same, thereby maximum focus value that can be when once focusing on before the mirror is as comparing with reference to value.
Need to prove, when being focused to initialization, this focuses on (focusing on first), perhaps this focuses on front when once being focused to distinct environment, in video camera when start this moment, be initialization procedure once, can adopt the global search algorithm to carry out traversal search all possible position is searched for one time in a direction.
When the rate of change of the focus value by calculating the current step of lens and lens maximum focus value last time, then can obtain next step step-length according to this rate of change:
Concrete, when rate of change less than or equal to 0.25 the time, be that the focus value in current step of lens is less than or equal to this lens maximum focus value last time of 0.25 times, then in this zone, find the probability of focal position minimum, can adopt coarse adjustment steps search in this zone, then next step step-size in search is 7-10 motor minimum step (an integer motor minimum step).When rate of change greater than 0.25 the time, be that the focus value in current step of lens is greater than this lens maximum focus value last time of 0.25 times, then in this zone, find the probability of focal position lower, can adopt medium step-length to search in this zone, then next step step-size in search is 3-4 motor minimum step (an integer motor minimum step).When rate of change greater than 0.25, and the difference of the focus value of the focus value in current step of lens and this lens back is during greater than the focus value of 0.25 times of this lens back, then in this zone, find the probability of focal position the highest, can adopt meticulous step-length to search in this zone, then next step step-size in search is the motor minimum step.
Step 103: calculate the product of described step-length coefficient and described next step step-length, and with described product as adjusting step-length.
Concrete, next step step-lengths of the lens that obtain in the step-length coefficient that obtains in the step 101 and the step 102 is multiplied each other, and with the product that calculates as the adjustment step-length.For example, the step-length coefficient that can find under the current aperture parameters of lens according to the funtcional relationship of the step-length coefficient in the step 101 and aperture parameters is 2; Next step step-length that gets access to lens according to step 102 was 3 steps; Can calculate according to the product of step-length coefficient and next step step-length then that to adjust step-length be 6 steps.
Step 104: move described lens according to described adjustment step-length, arrive next step position of described lens.
Concrete, arrive next step position according to the adjustment step-length mobile lens that obtains in the step 103.For example, the current location of lens is in 100 step positions, and the adjustment step-length that obtains in the step 103 was 6 steps, then according to adjusting step-length lens is moved to 106 step positions.
Step 105: repeat to arrive from the step-length coefficient under the described current aperture parameters of searching lens to mobile described lens the above-mentioned steps of next step position, until the focal position of described lens.
Repeat above-mentioned step from step 101 to step 104, calculate again next step adjustment step-length, lens are moved to next step position according to adjusting step-length, until find the focal position of lens again.
Need to prove that in focal position, the focus value of lens is greater than the focus value of the back position of described lens and greater than the focus value of next step position of described lens.At last, lens are moved to focal position.Auto focusing method of the present invention can also by detecting the position of lens, determine whether lens are moved to focal position.
Need to prove that in the process of finishing once search, the step-length coefficient of lens generally can not change, and only has when lens parameters changes, and just need to again obtain the step-length coefficient of lens.For example, when the focal length of lens or entrance pupil diameter change, at this moment need again obtain the step-length coefficient of lens.
Fig. 2 is the sequential chart of auto focusing method in the embodiment of the invention, and as shown in Figure 2, the detailed process of the auto focusing method of the embodiment of the invention is as follows:
In beginning 201 constantly, at first should obtain the current aperture parameters 202 of lens, the current aperture parameters 202 of lens can be brought formula (2) into according to the numerical value of the focal length of lens and entrance pupil diameter and be calculated.When searching step-length coefficient 203 under the current aperture parameters of lens according to the relation of the current aperture parameters of lens and step-length coefficient after the current aperture parameters that calculates lens, concrete, bring the current aperture parameters that calculates into formula (1) and can find out step-length coefficient under the current aperture parameters of lens.Focus value by calculating the current step of lens and the rate of change of lens maximum last time focus value obtain next step step-length of lens, are adjusted step-length 204 according to the product of step-length coefficient and next step step-length.According to adjusting the step-length mobile lens to next step position 205, and judge this moment, whether the position at lens place was focal position, namely judge whether to focus on successfully 206, if focus on successfully, then the search procedure end 207; If focus on unsuccessfully, then repeating step 204 to step 206 continues search, until focus on successfully.
After focusing on successfully, namely finished a search procedure, but changed 208 the time when the lens aperture parameter, then needed again to obtain lens stop parameter 202 and search for.
The auto focusing method of the embodiment of the invention, the optical characteristics of scioptics is obtained the step-length coefficient of lens, determine simultaneously the step-length of lens current search according to current actual scene, with the step-length coefficient with obtain the adjustment step-length after current step-length combines, search for according to adjusting step-length, the auto focusing method of the embodiment of the invention has considered that simultaneously the optical characteristics of lens and actual scene are on the impact of focal position, determine new step-size in search according to these two factors, thereby search fast focal position.
Above embodiment is for auto focusing method of the present invention, and is same, can utilize automatic focusing system to realize.Fig. 3 is the synoptic diagram of embodiment of the invention automatic focusing system, and as shown in Figure 3, embodiment of the invention automatic focusing system specifically comprises: search unit 31, acquiring unit 32, the first computing unit 33, mobile unit 34 and circular treatment unit 35.
The automatic focusing system of the embodiment of the invention also comprises: the second computing unit 36 is used for calculating by following equation the current aperture parameters of described lens:
Current aperture parameters=focal length/entrance pupil diameter.
The automatic focusing system that the embodiment of the invention proposes is searched the unit according to formula step-length coefficient=current aperture parameters/benchmark aperture parameters, searches the step-length coefficient under the current aperture parameters of lens; Acquiring unit calculates the rate of change of focus value and lens maximum focus value last time in described current step of lens according to the focus value in the current step of lens of obtaining, and obtains next step step-length according to described rate of change; The first computing unit calculates the product of described step-length coefficient and described next step step-length, and with described product as adjusting step-length; Mobile unit moves described lens according to described adjustment step-length, arrives next step position of described lens; The circular treatment unit repeats to arrive from the step-length coefficient under the described current aperture parameters of searching lens to mobile described lens the above-mentioned steps of next step position, until the focal position of described lens.Step-size in search impact when the automatic focusing system of the embodiment of the invention has been considered the optical characteristics of lens and actual scene simultaneously on the search focal position is determined step-size in search according to these two factors, thereby is searched focal position fast.
The professional should further recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software clearly is described, composition and the step of each example described in general manner according to function in the above description.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.The professional and technical personnel can specifically should be used for realizing described function with distinct methods to each, but this realization should not thought and exceeds scope of the present invention.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can use the software module of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random access memory (RAM), internal memory, ROM (read-only memory) (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is the specific embodiment of the present invention; the protection domain that is not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. an auto focusing method is characterized in that, described method comprises:
According to formula: step-length coefficient=current aperture parameters/benchmark aperture parameters, search the step-length coefficient under the current aperture parameters of lens, wherein, described current aperture parameters be described lens in the aperture parameters of current position, described benchmark aperture parameters is the aperture parameters that sets in advance;
Obtain the focus value in current step of lens, according to formula: the focus value in rate of change=current step/front once maximum focus value, calculate before the focus value in described current step of lens and the lens the once rate of change of maximum focus value, according to next step step-length of acquiring size of described rate of change;
Calculate the product of described step-length coefficient and described next step step-length, and with described product as adjusting step-length;
Move described lens according to described adjustment step-length, arrive next step position of described lens;
Repeat to arrive from the step-length coefficient under the described current aperture parameters of searching lens to mobile described lens the above-mentioned steps of next step position, until the focal position of described lens.
2. auto focusing method as claimed in claim 1, it is characterized in that, described according to formula step-length coefficient=current aperture parameters/benchmark aperture parameters, also comprise before searching the step-length coefficient under the current aperture parameters of lens, calculate the current aperture parameters of described lens by following formula:
Current aperture parameters=focal length/entrance pupil diameter
Described entrance pupil diameter is that aperture diaphragm is to the diameter of the optical system imaging of its front.
3. auto focusing method as claimed in claim 1 is characterized in that, the described focus value of obtaining the current step of lens is specially, and processes the focus value that obtains the described current step of lens according to the image that the current step of described lens takes.
4. auto focusing method as claimed in claim 1 is characterized in that, described before once maximum focus value be the focus value of described lens when once focusing on before in equivalent environment.
5. such as claim 1 or 4 described auto focusing methods, it is characterized in that, current be focused to first focus on or described when prefocusing and a front focusing ring border not simultaneously, described current focus method is the global search algorithm.
6. auto focusing method as claimed in claim 1 is characterized in that, described rate of change was less than or equal to 0.25 o'clock, and described next step step-length is 7,8,9 or 10 motor minimum steps; Described rate of change was greater than 0.25 o'clock, and described next step step-length is 3 or 4 described motor minimum steps; Described rate of change is greater than 0.25, and the difference of the focus value of the focus value in described current step of lens and back is during greater than the focus value of 0.25 times back, and described next step step-length is described motor minimum step.
7. auto focusing method as claimed in claim 1 is characterized in that, the focus value of described lens focus position is greater than the focus value of described lens back and greater than next step focus value of described lens.
8. an automatic focusing system is characterized in that, described device comprises:
Search the unit, be used for according to formula: step-length coefficient=current aperture parameters/benchmark aperture parameters, search the step-length coefficient under the current aperture parameters of lens, wherein, described current aperture parameters be described lens in the aperture parameters of current position, described benchmark aperture parameters is the aperture parameters that sets in advance;
Acquiring unit, be used for obtaining the focus value in current step of lens, according to formula: the focus value in rate of change=current step/front once maximum focus value, calculate before the focus value in described current step of lens and the lens the once rate of change of maximum focus value, according to next step step-length of acquiring size of described rate of change;
The first computing unit is used for calculating the product of described step-length coefficient and described next step step-length, and with described product as the adjustment step-length;
Mobile unit is used for moving described lens according to described adjustment step-length, arrives next step position of described lens;
The circular treatment unit is used for repeating arriving from the step-length coefficient under the described current aperture parameters of searching lens to mobile described lens the above-mentioned steps of next step position, until the focal position of described lens.
9. automatic focusing system as claimed in claim 8 is characterized in that, described device also comprises the second computing unit, is used for calculating by following equation the current aperture parameters of described lens:
Current aperture parameters=focal length/entrance pupil diameter.
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| CN105430277A (en) * | 2015-12-23 | 2016-03-23 | 北京奇虎科技有限公司 | Automatic focusing control method and device |
| CN105430279A (en) * | 2015-12-23 | 2016-03-23 | 北京奇虎科技有限公司 | Quick and automatic focusing method and device for camera |
| CN106154689A (en) * | 2015-04-28 | 2016-11-23 | 信泰光学(深圳)有限公司 | Atomatic focusing method and use the image capture unit of this Atomatic focusing method |
| CN106772925A (en) * | 2016-12-20 | 2017-05-31 | 天津理工大学 | A kind of passive camera automatic focusing method based on inner product energy |
| CN113810616A (en) * | 2021-09-27 | 2021-12-17 | 季华实验室 | Aperture focal length adjusting method, system, electronic device and storage medium |
| CN114460791A (en) * | 2022-03-07 | 2022-05-10 | 合肥英睿系统技术有限公司 | Focusing method and device, electronic equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106154689A (en) * | 2015-04-28 | 2016-11-23 | 信泰光学(深圳)有限公司 | Atomatic focusing method and use the image capture unit of this Atomatic focusing method |
| CN105430277A (en) * | 2015-12-23 | 2016-03-23 | 北京奇虎科技有限公司 | Automatic focusing control method and device |
| CN105430279A (en) * | 2015-12-23 | 2016-03-23 | 北京奇虎科技有限公司 | Quick and automatic focusing method and device for camera |
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| CN113810616A (en) * | 2021-09-27 | 2021-12-17 | 季华实验室 | Aperture focal length adjusting method, system, electronic device and storage medium |
| CN114460791A (en) * | 2022-03-07 | 2022-05-10 | 合肥英睿系统技术有限公司 | Focusing method and device, electronic equipment and storage medium |
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Effective date of registration: 20170609 Address after: 510640 Guangdong City, Tianhe District Province, No. five, road, public education building, unit 371-1, unit 2401 Patentee after: Guangdong Gaohang Intellectual Property Operation Co., Ltd. Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: Huawei Technologies Co., Ltd. |
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Inventor after: Xiong Ying Inventor before: Huang Xiaofeng Inventor before: Li Kai |
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Effective date of registration: 20170919 Address after: 276000, 3-299, Gao Zhen Village, Fang Qian Town, Junan County, Linyi, Shandong Patentee after: Xiong Ying Address before: 510640 Guangdong City, Tianhe District Province, No. five, road, public education building, unit 371-1, unit 2401 Patentee before: Guangdong Gaohang Intellectual Property Operation Co., Ltd. |
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Address after: 541199 Lingui County, Guilin, Lingui County, Lingui Town, Xinglin Road, No. 1, unit 202, Room 202 Patentee after: Xiong Ying Address before: 276000, 3-299, Gao Zhen Village, Fang Qian Town, Junan County, Linyi, Shandong Patentee before: Xiong Ying |
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Effective date of registration: 20180914 Address after: 244000 Shun an Jinshan Industrial Park, Yi An District, Tongling, Anhui Patentee after: Anhui Rongjing Fengdan Biotechnology Co., Ltd. Address before: 541199 room 2, unit 8, Xinglin Road, Lingui Town, Lingui, the Guangxi Zhuang Autonomous Region, 202, Guilin, 202 Patentee before: Xiong Ying |