CN102540639A - Automatic focusing method and image capturing system - Google Patents
Automatic focusing method and image capturing system Download PDFInfo
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- CN102540639A CN102540639A CN2010105863042A CN201010586304A CN102540639A CN 102540639 A CN102540639 A CN 102540639A CN 2010105863042 A CN2010105863042 A CN 2010105863042A CN 201010586304 A CN201010586304 A CN 201010586304A CN 102540639 A CN102540639 A CN 102540639A
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Abstract
The invention relates to an automatic focusing method and an image capturing system. The automatic focusing method comprises the following steps of: focusing in a first movement interval of a focusing mode by using a focusing lens, and recording a plurality of first focusing positions and a plurality of corresponding first focusing data; then judging whether an absolute maximum value exists in the first focusing data; if not, determining a second movement interval, and enabling the focusing lens to focus in the second movement interval to obtain a plurality of second focusing data; and determining the absolute maximum value according to the second focusing data, and enabling a second focusing position corresponding to the absolute maximum value to be an automatic focusing position.
Description
Technical field
The present invention relates to a kind of imaging technique, particularly relate to a kind of automatic focusing method of image acquisition system.
Background technology
Digital camera can be carried out the correction of infinite distance focusing position to focus lens usually before dispatching from the factory, and the infinite distance focusing position that correction obtains is recorded in the internal memory in the digital camera.When the user partly depresses shutter release button and when starting automatic focusing program, digital camera promptly with the infinite distance focusing position of this storage as benchmark, move focus lens to focus.
Yet digital camera often receives external environment condition to be changed, and for example temperature or humidity change; Perhaps receive external force; For example fall to falling or different putting position, cause the skew of focus lens, the corrected value before making real infinite distance focusing position differ to dispatch from the factory; Cause focus lens to fail to move to correct focusing position, let the user because of focusing bad or failing and shoot fuzzy image.Particularly,, very easily cause the change of camera lens refractive index because plastic material itself absorbs aqueous vapor easily for the camera lens of plastic material.In addition, rising-heat contracting-cold or the variation of moisture degree possibly take place with ambient temperature and humidity in camera lens, thereby cause the change of refractive index.
This shows that above-mentioned existing imaging technique obviously still has inconvenience and defective, and demands urgently further improving in method and use.In order to solve the problem of above-mentioned existence; Relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly; But do not see always that for a long time suitable design is developed completion; And conventional method and method do not have appropriate method and method to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of new automatic focusing method and image acquisition system, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Summary of the invention
The objective of the invention is to; Overcome the defective that existing imaging technique exists; And a kind of new automatic focusing method and image acquisition system are provided, technical matters to be solved is to make it propose a kind of automatic focusing method and image acquisition system, influences the skew that is caused because of external environment with the preset focusing position of revisal; And can focus automatically exactly, be very suitable for practicality.
The object of the invention and solve its technical matters and adopt following technical scheme to realize.The focus lens of utilizing according to the present invention proposes is focused in one first moving section of a focusing pattern; Write down a plurality of first focusing positions and corresponding a plurality of first focus data; Judge whether above-mentioned first focus data exists a bare maximum; As not, then determine one second moving section; This focus lens is focused, to obtain a plurality of second focus data in this second moving section; And according to this bare maximum of above-mentioned second focus data decision, and make with corresponding one second focusing position of this bare maximum be an automatic focusing position.
The object of the invention and solve its technical matters and also can adopt following technical measures further to realize.
Aforesaid automatic focusing method wherein saidly more comprises: when judging that there is a bare maximum in above-mentioned first focus data, then decision is this automatic focusing position with corresponding this first focusing position of this bare maximum.
Aforesaid automatic focusing method, wherein said above-mentioned first focus data and above-mentioned second focus data are clear-cut margin degree values.
Aforesaid automatic focusing method; Wherein said this first moving section is between one first predeterminated position and one second predeterminated position; When corresponding this first focus data of this second predeterminated position was relative maximum, then this second moving section was outwards to move to one the 3rd predeterminated position from this second predeterminated position; When corresponding this first focus data of this first predeterminated position was relative maximum, then this second moving section was outwards to move to one the 4th predeterminated position from this first predeterminated position.
The object of the invention and solve its technical matters and also adopt following technical scheme to realize.Focus lens according to the present invention's proposition; One actuator drives this focus lens to a plurality of first focusing positions in one first moving section of a focusing pattern; One storage device is in order to write down above-mentioned first focusing position and corresponding a plurality of first focus data; And a central processing system, whether there is a bare maximum in order to determine above-mentioned first focus data; Wherein work as above-mentioned first focus data and do not have this bare maximum; Then this central processing system determines one second moving section; And this focus lens of this actuator is moved in this second moving section; Obtaining corresponding a plurality of second focus data, and this central processing system is according to above-mentioned this bare maximum of second focus data decision, and make with corresponding one second focusing position of this bare maximum be an automatic focusing position.
The object of the invention and solve its technical matters and also can adopt following technical measures further to realize.
Aforesaid image acquisition system; Wherein said this first moving section is between one first predeterminated position and one second predeterminated position; When corresponding this first focus data of this second predeterminated position was relative maximum, then this second moving section was outwards to move to one the 3rd predeterminated position from this second predeterminated position; When corresponding this first focus data of this first predeterminated position was relative maximum, then this second moving section was outwards to move to one the 4th predeterminated position from this first predeterminated position.
Aforesaid image acquisition system, wherein said this first predeterminated position are an infinite distance focusing position that is stored in this storage device.
Aforesaid image acquisition system is built one and is activated step number modulation table in wherein said this storage device, in order to activate the step number rate of change according to one of this focal modes and this actuator of environmental parameter modulation.
Aforesaid image acquisition system, wherein said this central processing system activates step number modulation table according to this, with modulation the 3rd predeterminated position and the 4th predeterminated position.
Aforesaid image acquisition system, wherein said this central processing system is upgraded this infinite distance focusing position according to the 4th predeterminated position, and this storage device should activate step number modulation table according to the 4th predeterminated position to upgrade.
The present invention compared with prior art has tangible advantage and beneficial effect.Can know that by above technical scheme major technique of the present invention thes contents are as follows:
For achieving the above object, the invention provides a kind of automatic focusing method, at first utilize focus lens in first moving section of a focusing pattern, to focus, and write down a plurality of first focusing positions and corresponding a plurality of first focus data.Then, judge whether above-mentioned first focus data exists a bare maximum.As not, then determine one second moving section, and focus lens is focused in second moving section, to obtain a plurality of second focus data; And according to above-mentioned second focus data decision bare maximum, and make with corresponding second focusing position of bare maximum be an automatic focusing position.
In addition, for achieving the above object, the present invention also provides a kind of image acquisition system, and it comprises focus lens, actuator, storage device and central processing system.Actuator drives focus lens to a plurality of first focusing positions in first moving section of a focusing pattern.Storage device writes down above-mentioned first focusing position and corresponding a plurality of first focus data.Central processing system determines whether above-mentioned first focus data exists a bare maximum.Wherein, When there is not bare maximum in above-mentioned first focus data; Then central processing system determines one second moving section, and the actuator focus lens is moved in second moving section, to obtain corresponding a plurality of second focus data; And central processing system is according to above-mentioned second focus data decision bare maximum, and make with corresponding second focusing position of bare maximum be an automatic focusing position.
By technique scheme; Focus automatically method and image acquisition system of the present invention has advantage and beneficial effect at least: digital camera changes receiving external environment condition; Perhaps receive external force, cause the skew of focus lens, the corrected value before making real infinite distance focusing position differ to dispatch from the factory; Focus lens can move to correct focusing position automatically, overcomes the user because of focusing bad or failing and shoot fuzzy image.Particularly, absorb aqueous vapor, the change of revisal camera lens refractive index automatically owing to plastic material itself is easy for the camera lens of plastic material.
In sum, the invention relates to a kind of automatic focusing method and image acquisition system, refer to utilize focus lens in first moving section of a focusing pattern, to focus especially, and write down a plurality of first focusing positions and corresponding a plurality of first focus data.Then, judge whether above-mentioned first focus data exists a bare maximum.As not, then determine one second moving section, and focus lens is focused in second moving section, to obtain a plurality of second focus data; And according to above-mentioned second focus data decision bare maximum, and make with corresponding second focusing position of bare maximum be an automatic focusing position.The present invention has apparent progress technically, and has tangible good effect, really is a novelty, progress, practical new design.
Above-mentioned explanation only is the general introduction of technical scheme of the present invention; Understand technological means of the present invention in order can more to know; And can implement according to the content of instructions, and for let above and other objects of the present invention, feature and advantage can be more obviously understandable, below special act preferred embodiment; And conjunction with figs., specify as follows.
Description of drawings
Fig. 1 is focus the automatically functional-block diagram of image acquisition system of method and image acquisition system embodiment of the present invention.
Fig. 2 is focus the automatically process flow diagram of automatic focusing method of method and image acquisition system embodiment of the present invention.
Fig. 3 A, Fig. 3 B, the various boundary curves of Fig. 3 C illustration.
10: camera lens module 102: focus lens
104: lens driving apparatus 12: storage device
122: internal memory 124: hard disk
14: central processing system 142: arithmetic element
144: control module 16: image sensing unit
18: environmental parameter sensing cell 21-27: step
D1: the first moving section D2, D3: second moving section
F1: the first predeterminated position F2: second predeterminated position
F3: the 3rd predeterminated position F4: the 4th predeterminated position
AF, AF ', AF ": automatic focusing position
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention; Below in conjunction with accompanying drawing and preferred embodiment; To automatic focusing method and its embodiment of image acquisition system, method, step, characteristic and the effect thereof that proposes according to the present invention, specify as after.
Fig. 1 shows the functional block diagram of the image acquisition system of the embodiment of the invention.The image acquisition system of present embodiment mainly is in order to carry out automatic focusing; This image acquisition system can be camera, video camera, mobile phone, personal digital assistant (Personal Digital Assistant; PDA), digital music (MPEG Audio Layer 3; MP3) player or network camera (webcam), but not as limit.In the present embodiment, image acquisition system mainly comprises camera lens module 10, storage device 12 and central processing system 14.In addition, image acquisition system also can comprise image sensing unit 16 and environmental parameter sensing cell 18.
As shown in Figure 1, the camera lens module 10 of present embodiment comprises focus lens 102 and lens driving apparatus 104.Wherein, focus lens 102 is removable in a preset moving section, in order to object is focused.Focus lens 102 includes at least one pair of focus lens usually.Lens driving apparatus 104 is controlled by central processing system 14, in order to what drive focus lens 102 focus lens is moved to a plurality of focusing positions.Lens driving apparatus 104 can comprise an actuator, step motor for example, but not as limit.
Please continue to consult Fig. 1,10 picked image of camera lens module convert digital electric signal via image sensing unit 16 into by the light signal of simulating, and it includes a plurality of focus data that camera lens module 10 is obtained, for example clear-cut margin degree (sharpness) value.Then, above-mentioned focus data is fed into central processing system 14 and carries out calculation process.The central processing system 14 of present embodiment comprises arithmetic element 142 and control module 144.Wherein, 142 pairs of above-mentioned focus data of arithmetic element are carried out numerical operation, and 144 of control modules determine according to operation result how controls lens drive unit 104 finally obtains an automatic focusing position to move focus lens 102.The arithmetic element 142 of present embodiment can be digital signal processor; Control module 144 can be CPU; And it can be a chips that real work is gone up central processing system 14, and arithmetic element 142 and control module 144 are to be incorporated on the chip, but not as limit.
Please continue to consult Fig. 1, storage device 12 mainly is in order to write down above-mentioned focusing position and corresponding focus data.The storage device 12 of present embodiment comprises as the hard disk 124 of building internal memory 122 and conduct time internal memory in the primary memory.In addition, storage device 12 also can be in order to store the infinite distance focusing position.Particularly; In one embodiment, storage device 12 stores the actuating step number modulation table of lens driving apparatus 104, the pairing actuating step number of the environmental parameter rate of change rate of change of its each focal modes of record (zoom mode); Wherein environmental parameter is meant temperature or humidity, but is not limited thereto.Following table one illustration one activates step number modulation table, in table one, is example with temperature as environmental parameter.In this embodiment, for the wide-angle focal modes, if the infinite distance focusing position during 25 ℃ of temperature is the position of 200 step numbers, then when 0 ℃ of temperature, the infinite distance focusing position will become the position of 150 step numbers, i.e. 200-10* ((25-0)/5).In one embodiment, central processing system 14 can be updated in the infinite distance focusing position behind the modulation in the storage device 12.The variation of said temperature can be provided by environmental parameter sensing cell 18.
Table one
Fig. 2 shows the process flow diagram of the automatic focusing method of the embodiment of the invention, and it is applicable to image capture unit shown in Figure 1.Below about the process description of Fig. 2, please consult image capture unit shown in Figure 1 simultaneously.At first, in step 21, under a focusing pattern, utilize a plurality of first focusing positions of focus lens 102 in first moving section of this focal modes to focus.As previously mentioned, focus lens 102 can be by actuator to above-mentioned first focusing position of lens driving apparatus 104.With the digital camera is example; Digital camera generally can be divided into several focal modes; For example be divided into general focal modes and focal modes nearby, wherein, the focusing range of general focal modes is focusing position to 80 centimetre from the infinite distance; And nearby the focusing range of focal modes from 80 centimetres to 10 centimetres, but not as limit.Then, in step 22, with storage device 12 above-mentioned first focusing positions of record and corresponding a plurality of first focus data.In the present embodiment, first focus data is a clear-cut margin degree value.Above-mentioned first focusing position and above-mentioned first focus data form the one edge curve jointly.Fig. 3 A illustration one edge curve, its longitudinal axis is represented focus data, and transverse axis is then represented focusing position.In this example, the first moving section D1 is between the first predeterminated position F1 and the second predeterminated position F2.Wherein, the first predeterminated position F1 can be the infinite distance focusing position, and it can be stored in the storage device 12.
Please continue to consult Fig. 1, Fig. 2 and Fig. 3 A,, judge with central processing system 14 whether above-mentioned first focus data of boundary curve exists a bare maximum in step 23.In the present embodiment, the numerical value of the forward and backward adjacent position of " bare maximum " is all less than this bare maximum.There has been bare maximum if the judged result in step 23 is a boundary curve, then got into step 24, decision and the automatic focusing position of corresponding first focusing position conduct of this bare maximum.With boundary curve shown in Fig. 3 A is example; Central processing system 14 is according to the slope of boundary curve; Or judge the first focusing position AF place according to the numerical values recited of the forward and backward adjacent position of first focusing position and have bare maximum, be automatic focusing position and define this place.
See also Fig. 1 and Fig. 2, do not have bare maximum if the judged result in the step 23 is a boundary curve, then get into step 25, central processing system 14 calculates second moving section according to boundary curve.Then, in step 26, central processing system 14 makes the actuator of lens driving apparatus 104 move focus lens 102 and focuses at a plurality of second focusing positions of second moving section, to obtain corresponding a plurality of second focus data.As aforementioned first focus data, second focus data of present embodiment is a clear-cut margin degree value.At last, in step 27, central processing system 14 according to the slope of the boundary curve of above-mentioned second focus data or numerical values recited with the definition bare maximum, and make and corresponding second focusing position of bare maximum as focusing position automatically.
Another boundary curve of Fig. 3 B illustration; Corresponding first focus data of its second predeterminated position F2 is not to be bare maximum for the first moving section D1; And be merely relative maximum, promptly central processing system 14 judges that according to the slope or the numerical values recited of boundary curve only there is relative maximum in first focus data.Therefore; According to step 25; Outwards move to the 3rd predeterminated position F3 from the second predeterminated position F2; Obtaining the second moving section D2 between the second predeterminated position F2 and the 3rd predeterminated position F3, or push back a ad-hoc location to the second predeterminated position F2 forward as the second moving section D2 by the 3rd predeterminated position F3, promptly the second moving section D2 can be from the second predeterminated position F2 to the, three predeterminated position F3; Also can be from ad-hoc location to the three predeterminated position F3, wherein comprise the second predeterminated position F2.Please be simultaneously with reference to Fig. 1 and Fig. 2, particularly, the 3rd predeterminated position F 3 can be that central processing system 14 utilizes extrapolation to calculate and get according to boundary curve, or build the predeterminable range value in the storage device 12 in; And ad-hoc location can be the predeterminable range value that focus lens 102 is advanced toward the first predeterminated position F1 direction from the second predeterminated position F2 by lens driving apparatus 104; For example if adopt step motor as lens driving apparatus 104; Then setting ad-hoc location promptly is that step motor advances the present count position in step from the second predeterminated position F2 toward the first predeterminated position F1 direction, but is not limited to this.Be in the present embodiment with from the second predeterminated position F2 to the, three predeterminated position F3 as the second moving section D2.
Please refer again to Fig. 1 and Fig. 2, then,, move focus lens 102 at the second moving section D2, to obtain second focus data according to step 26.At last,, determine the bare maximum of the second moving section D2, and make the corresponding second focusing position AF ' as automatic focusing position according to step 27.With boundary curve shown in Fig. 3 B is example, and central processing system 14 judges that the second focusing position AF ' locates to exist bare maximum, therefore makes it as automatic focusing position.
The another boundary curve of Fig. 3 C illustration; Corresponding first focus data of its first predeterminated position F1 is not to be bare maximum for the first moving section D1; And be merely relative maximum, promptly central processing system 14 is judged to be relative maximum according to the slope or the numerical values recited of boundary curve.Therefore; According to step 25; Outwards move to the 4th predeterminated position F4 from the first predeterminated position F1; Thereby obtain the second moving section D3 between the first predeterminated position F1 and the 4th predeterminated position F4, or push back a ad-hoc location to the first predeterminated position F1 as the second moving section D3 by the 4th predeterminated position F4 backward, promptly the second moving section D3 can be from the first predeterminated position F1 to the, four predeterminated position F4; Also can be from ad-hoc location to the four predeterminated position F4, wherein comprise the first predeterminated position F1.In the present embodiment, as the second moving section D3, but be not limited to this with the first predeterminated position F1 to the, four predeterminated position F4.Then, according to step 26, move focus lens 102 at the second moving section D3, to obtain second focus data.At last,, determine the bare maximum of the second moving section D3, and make the corresponding second focusing position AF according to step 27 " as automatic focusing position.With boundary curve shown in Fig. 3 C is example, and central processing system 14 is judged the second focusing position AF " locate to exist bare maximum, therefore make it as automatic focusing position.
See also Fig. 1, Fig. 3 B, Fig. 3 C and table one, in one embodiment, central processing system 14 can be according to focal modes and current environment parameter, and for example temperature or humidity are with the actuating step number rate of change of the actuator of modulation lens driving apparatus 104.Moreover central processing system 14 also can be according to like table one an illustrative actuating step number modulation table, with modulation the 3rd predeterminated position F3 and the 4th predeterminated position F4.In another embodiment; Central processing system 104 can be according to the 4th predeterminated position F4 to upgrade the infinite distance focusing position; And storage device 12 can be according to the 4th predeterminated position F4 to upgrade like table one an illustrative actuating step number modulation table; But be not limited to this, know this art and also can consider other another actuating step number modulation table of environmental parameter revision of adjustment or be replaced as an actuating step number modulation formula.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction; Though the present invention discloses as above with preferred embodiment; Yet be not in order to limiting the present invention, anyly be familiar with the professional and technical personnel, in not breaking away from technical scheme scope of the present invention; When the technology contents of above-mentioned announcement capable of using is made a little change or is modified to the equivalent embodiment of equivalent variations; In every case be not break away from technical scheme content of the present invention, to any simple modification, equivalent variations and modification that above embodiment did, all still belong in the scope of technical scheme of the present invention according to technical spirit of the present invention.
Claims (10)
1. automatic focusing method is characterized in that it comprises following steps:
Utilize a focus lens in one first moving section of a focusing pattern, to focus;
Write down a plurality of first focusing positions and corresponding a plurality of first focus data;
Judge whether above-mentioned first focus data exists a bare maximum;
As not, then determine one second moving section;
This focus lens is focused, to obtain a plurality of second focus data in this second moving section; And
According to this bare maximum of above-mentioned second focus data decision, and make with corresponding one second focusing position of this bare maximum be an automatic focusing position.
2. automatic focusing method as claimed in claim 1 is characterized in that it more comprises: when judging that there is a bare maximum in above-mentioned first focus data, then decision is this automatic focusing position with corresponding this first focusing position of this bare maximum.
3. automatic focusing method as claimed in claim 1 is characterized in that above-mentioned first focus data and above-mentioned second focus data are clear-cut margin degree values.
4. automatic focusing method as claimed in claim 1; It is characterized in that this first moving section is between one first predeterminated position and one second predeterminated position; When corresponding this first focus data of this second predeterminated position was relative maximum, then this second moving section was outwards to move to one the 3rd predeterminated position from this second predeterminated position; When corresponding this first focus data of this first predeterminated position was relative maximum, then this second moving section was outwards to move to one the 4th predeterminated position from this first predeterminated position.
5. image acquisition system is characterized in that it comprises:
One focus lens;
One actuator drives this focus lens to a plurality of first focusing positions in one first moving section of a focusing pattern;
One storage device is in order to write down above-mentioned first focusing position and corresponding a plurality of first focus data; And
Whether one central processing system exists a bare maximum in order to determine above-mentioned first focus data;
Wherein work as above-mentioned first focus data and do not have this bare maximum; Then this central processing system determines one second moving section; And this focus lens of this actuator is moved in this second moving section; Obtaining corresponding a plurality of second focus data, and this central processing system is according to above-mentioned this bare maximum of second focus data decision, and make with corresponding one second focusing position of this bare maximum be an automatic focusing position.
6. image acquisition system as claimed in claim 5; It is characterized in that this first moving section is between one first predeterminated position and one second predeterminated position; When corresponding this first focus data of this second predeterminated position was relative maximum, then this second moving section was outwards to move to one the 3rd predeterminated position from this second predeterminated position; When corresponding this first focus data of this first predeterminated position was relative maximum, then this second moving section was outwards to move to one the 4th predeterminated position from this first predeterminated position.
7. image acquisition system as claimed in claim 6 is characterized in that this first predeterminated position is an infinite distance focusing position that is stored in this storage device.
8. image acquisition system as claimed in claim 7 is characterized in that building in this storage device one and activates step number modulation table, in order to activate the step number rate of change according to one of this focal modes and this actuator of environmental parameter modulation.
9. image acquisition system as claimed in claim 8 is characterized in that this central processing system is according to this actuating step number modulation table, with modulation the 3rd predeterminated position and the 4th predeterminated position.
10. image acquisition system as claimed in claim 8 it is characterized in that this central processing system according to this infinite distance focusing position of the 4th predeterminated position renewal, and this storage device should activate step number modulation table according to the 4th predeterminated position to upgrade.
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| CN105262944A (en) * | 2014-07-11 | 2016-01-20 | 英特尔公司 | systems and method to provide automatic focus with self-calibration |
| CN110244444A (en) * | 2019-05-21 | 2019-09-17 | 深圳市智影医疗科技有限公司 | Microscopical focusing method, device, terminal device and storage medium |
| CN112461853A (en) * | 2020-10-30 | 2021-03-09 | 珠海市奥德维科技有限公司 | Automatic focusing method and system |
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Application publication date: 20120704 |