CN105259729B - A kind of AF quick focusing method - Google Patents
A kind of AF quick focusing method Download PDFInfo
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- CN105259729B CN105259729B CN201410341805.2A CN201410341805A CN105259729B CN 105259729 B CN105259729 B CN 105259729B CN 201410341805 A CN201410341805 A CN 201410341805A CN 105259729 B CN105259729 B CN 105259729B
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Abstract
The present invention relates to a kind of AF rapid focus modes, under the premise of not increasing the volume of original cam lens mould group, the valid pixel of sensitive chip is divided into a region R and a region L two parts, to export one first image and one second image to be able to imitate human eye, and then the contrast of first image and second image is carried out analyzing comparison to judge that current lens mould group is in preceding burnt, focus or rear friendship, so that motor drives the end mobile to the focal position, focusing is completed.
Description
Technical field
The present invention relates to a kind of AF quick focusing methods, are based especially on a kind of AF rapid focus of the active focusing of phase
Method.
Background technique
Camera is applied to the mobile phone camera lens module of mobile phone especially extremely widely, is that people keep memory, wound here
Make the only good choosing of visual sense of beauty.With the increasingly improvement of electronic equipment, people force phase to the pursuit of camera shooting quality
Machine manufactures industry and continuously improves, reforms to cater to the demand in market.
Auto-focusing mould of the update of camera other than the continuous audit of sensitive chip and camera lens, in picture system
Formula also becomes a part that industry is increasingly valued gradually.As shown in Figure 1 to Figure 2, the auto-focusing master of cam lens mould group
It is divided into two classes；1. passive type is focused, i.e., by constantly driving the camera lens of the cam lens mould group steppingly to move
L is subjected to displacement to focus f, meanwhile, in the process analyze object T on imaging surface P at picture image comparison
Degree, to obtain the highest peak point S of the contrast, then by the comparison of the peak point S and surrounding peak value S` so that institute
It states motor the camera lens Len is driven to tend to the peak point S and move back and forth to find the position of the focus, so far just calculate and complete
Focusing；2. active focusing, i.e., after the object distance l by calculating object T and the Len, institute is thus directly calculated
The distance that Len should be moved is stated, to find the focal position to complete to focus.More active focusing, passive type focusing need
The focus point can just be found by wanting the motor that the Len is driven to walk up and down after full journey, be difficult to promote focusing speed, and actively
Formula focusing needs to realize by increasing other hardware.In present mobile phone camera lens module, it is common that be by
Dynamic formula focusing is difficult to be pushed away in mobile phone camera lens module actually under the development for promoting electronic product microminiaturization
Extensively.Therefore, small in size and with the high focus efficiency a camera mould group urgently caters to huge market needs.
Summary of the invention
The main purpose of the present invention is to provide a kind of AF quick focusing methods, are not increasing original cam lens mould group
Volume under the premise of, the valid pixel of sensitive chip is divided into a region R and a region L two parts, thus to be able to mould
Prosthetic Hand exports one first image and one second image, and then to pair of first image and second image
Analysis comparison is carried out than degree to judge that current lens mould group is handed in preceding burnt, focus or afterwards, so that motor drives the end
It is mobile to the focal position, focusing is completed, the focusing efficiency of the cam lens mould group is improved.
Another object of the present invention is to provide a kind of AF quick focusing methods, are not increasing original cam lens mould
It realizes under the premise of the volume of group and actively focuses, so that the cam lens mould group is promoted in small-sized electronic product to be made
With such as mobile phone.
Another object of the present invention is to provide a kind of AF quick focusing methods, by leading in the cam lens mould group
Apish right and left eyes are crossed to export the first image RP and the second image LP and be able to through described the first one-tenth of analysis comparison
As the contrast of figure RP and the second image LP obtain the camera lens Len of the cam lens mould group preceding burnt, focus and
Burnt position afterwards.
Another object of the present invention is to provide a kind of AF quick focusing method, when judging the cam lens mould group
The camera lens current location when, the motor is able to drive the camera lens mobile to focal position, to complete to focus, thus
Improve the focusing efficiency of the cam lens mould group.
Another object of the present invention is to provide a kind of AF quick focusing methods, when the object is in dynamic, institute
The entire focusing step for stating AF quick focusing method is in cyclic process, is able to root in different location with the determination object
Judge the motor to the driving direction of the camera lens according to the current location of the camera lens.
Another object of the present invention is to provide a kind of AF quick focusing methods, when the object is in static state, institute
The part focusing step for stating AF quick focusing method is in cyclic process, is able to root in different location with the determination object
Judge the motor to the driving direction of the camera lens according to the current location of the camera lens.
Another object of the present invention is to provide a kind of AF quick focusing methods, are not increasing new hardware to original camera shooting
It realizes under the premise of the volume of head lens module and actively focuses, to mitigate the quality of the cam lens mould group.
To realize above target, the present invention provides a kind of AF quick focusing method, the AF quick focusing method include with
Lower step:
A: the effective pixel area of sensitive chip is divided into region R and region L two parts after photographic subjects object, to simulate people
Left eye and right eye, export the first image RP and the second image LP；
B: judge the position when camera lens focus and defocus of cam lens mould group；
C: the current location of the camera lens is judged to determine the moving direction of motor；With
D: the mobile camera lens to the focal position completes focusing with blur-free imaging.
Wherein, the step C is further comprised the steps of:
C.1: judging whether the camera lens is in the focal position, if so then execute step C.5, then follow the steps if not
C.4；
C.2: judging whether the camera lens is in the preceding burnt position and thens follow the steps if not if so then execute step C.2
C.4；
C.3: it is mobile that the motor drives the camera lens to be biased to the rear burnt position；
C.4: it is mobile that the motor drives the camera lens to be biased to the preceding burnt position；With
C.5: the motor stops driving the camera lens mobile, to complete to focus.
It is noted that step included by the step C also obtains as following steps:
C.1: C.4 whether judgement is described thens follow the steps in focal position if so then execute step C.5 if not；
C.2: judging whether the camera lens is in the rear burnt position and thens follow the steps if not if so then execute step C.2
C.4；
C.3: it is mobile that the motor drives the camera lens to be biased to the preceding burnt position；
C.4: it is mobile that the motor drives the camera lens to be biased to the rear burnt position；With
C.5: the motor stops driving the camera lens mobile, to complete to focus.
Detailed description of the invention
As shown in the figure 1 is cam lens mould group focusing schematic diagram.
Camera lens shown in as shown in the figure 2 contrast for the imaging of cam lens mould group is mobile and changes the variation diagram of focal length.
It is illustrated in figure 3 a kind of focusing schematic diagram of AF quick focusing method of one embodiment of the present invention.
It is illustrated in figure 4 a kind of AF quick focusing method of one embodiment of the present invention camera lens in focusing and is in preceding coke P,
Focus P` and rear coke P`` schematic diagram.
It is corresponding when camera lens is in preceding coke P for a kind of AF quick focusing method of one embodiment of the present invention as shown in Figure 5A
The first image and the second image Analysis of Contrast figure.
It is as shown in Figure 5 B a kind of AF quick focusing method of one embodiment of the present invention when camera lens is in preceding coke P` pair
The Analysis of Contrast figure of the first image and the second image answered.
It is as shown in Figure 5 C a kind of AF quick focusing method of one embodiment of the present invention when camera lens is in preceding coke P`` pair
The Analysis of Contrast figure of the first image and the second image answered.
The valid pixel being illustrated in figure 6 on a kind of sensitive chip of AF quick focusing method of one embodiment of the present invention
The distribution map of region R and region L.
It is illustrated in figure 7 a kind of a kind of flow chart of AF quick focusing method of one embodiment of the present invention.
It is illustrated in figure 8 a kind of another flow chart of AF quick focusing method of one embodiment of the present invention.
Specific embodiment
Claim according to the present invention and specification disclosure of that, technical solution of the present invention literary institute specific as follows
It states.
It is a kind of AF quick focusing method focusing schematic illustration of one embodiment of the present invention, institute as shown in Figure 3 to Figure 4
AF quick focusing method is stated under the premise of not increasing new hardware to original cam lens mould group, by using the AF
When quick focusing method shoots object T, the T be able to clearly and rapidly to image in the camera module at
Image planes P.Specifically, the AF quick focusing method is by making the internal sensor system of the cam lens mould group will be photosensitive
Valid pixel on chip divides into a region R10 and a region L20 two parts, to simulate the left eye and right eye of people, thus point
Corresponding first image 11 of the region R10 and corresponding second image 21 of the region L20 are not exported, by described
The motor of the comparative analysis of first image 11 and second image 12, the cam lens mould group is adjusted with becoming clear
The moving direction of the camera lens Len of the cam lens mould group is saved, to be imaged on the P, more traditional auto-focusing is described
AF quick focusing method is improved the focusing efficiency of the cam lens mould group.
It is noted that the AF quick focusing method is able to promoting the camera shooting head mirror without increasing new hardware
The focusing rate of head mould group, that is to say, that the AF quick focusing method is not necessarily to increase the volume of the cam lens mould group
Reach the focusing rate for promoting the cam lens mould group, so that the AF quick focusing method is able to set in miniature electric
It is standby to be used more widely, such as mobile phone.
As shown in Figure 5 A to FIG. 5 C, further, when obtaining picture, below the region R10 and the region L20
A column pixel be respectively seen as individual sensitive chip, and then be able to be exported respectively according to the region R10 and the region L20
One first image 11 and one second image 21.With every row below region R10 described in described Fig. 6 and the region L20
Row radix is abscissa, is ordinate to first image 11 and second imaging using the highest contrast of every row pixel
Figure 21 is analyzed, the first high contrast variation diagram 12 of first image 11 and described of second image
Two high contrast change curves 22 are able to be compared to the same coordinate system.The first high contrast variation diagram 12 has one the
One peak point 121, first peak point 121 corresponding one first mark value 122 on the abscissa of the coordinate system, described the
One mark value 122 moves on the abscissa of the coordinate system with the movement of first peak point 121；Described second is high
Comparison diagram changing value 22 has one second peak point 221, and second peak point 221 is corresponding on the abscissa of the coordinate system
One second mark value 222, second mark value 222 is with the movement of second peak point 221 and in the coordinate system
It is moved on abscissa.When first mark value 122 is equal to second mark value 222, at the cam lens mould group
In focal position, at this point, the T being taken is able to the blur-free imaging on the P, when first mark value 122 is not equal to described
When the second mark value 222, the cam lens mould group is in defocus position, at this point, the T30 being taken can not be on the P
Blur-free imaging.
The cam lens mould group is able to be divided into the focal position or the defocus position according to the imaging of the T
It sets, further, the defocus position includes preceding burnt and rear coke.Specifically, when first mark value 122 is equal to second mark
When note value 222, the cam lens mould group is in the focal position, that is to say, that the T is in imaging on the P
The camera lens Len of clarity highest, the cam lens mould group is mobile without carrying out roll adjustment.When first mark value 122 is small
When second mark value 222, Len mould group burnt position before being in described, when first mark value 122 is greater than second mark
When note value 222, the burnt position after being in described the Len, burnt position is located at the left side of the focal position before described, burnt after described
Position is located at the right side of the focal position, that is to say, that when the T images in the left side of the P, the motor is driven
The Len is biased to the preceding burnt position, that is, moves right, close to the focal position；When first mark value 122 is greater than
When second mark value 222, coke position, the T image in the right side of the P, the horse after the Len mould group is in described
Up to being able to drive the Len to be moved to the left, to burnt position after described close to the focal position.
It to sum up states, by analyzing the size of first mark value 122 and second mark value 222, is sentenced
The Len mould group of breaking is in and burnt position, before described burnt position or it is described after burnt position, and then the motor is able to described in driving
The moving direction of Len, so that the Len moves back and forth on a shorter section finally as the focal position to complete
State the focusing operation of camera.
It is noted that the Len is not necessarily to the work in the motor when the camera is in the focal position
It is moved under, more traditional passive type focal modes need to make that the Len moves through the focus and the defocus is complete
Process, the AF quick focusing method are improved the focusing rate of the cam lens mould group.
Further, the region R only in light G primary colors device and B primary colors device extract, the region L only
To in light G primary colors device and R primary colors device extract, and then make to obtain through the region R and the region L the first one-tenth described
As Figure 11 and second image 12 respectively obtain described first correlation curve Figure 12 and described second correlation curve Figure 22, into
And the focus position is in the cam lens mould group according to first mark value 122 and second mark value 222
It sets, and then the direction movement that the motor is able to that the Len mould group is driven to determine to one is quickly to reach the focal position.
To pass it is noted that the AF quick focusing method is also improved when the T can be absorbed when wave living
The difficult phenomenon of active focal modes of uniting focusing, to improve the cam lens mould group imaging success rate.
It is noted that the AF quick focusing method be also improved because the T be glass when because reflection is able to
The phenomenon crossed glass and make focusing difficult.
As shown in Figure 7, Figure 8, it to sum up states, the AF quick focusing method includes the following steps:
A: it shoots and the effective pixel area of the sensitive chip is divided into the region R10 and the region L20 after the T
Two parts export the first image RP11 and beat up the second image LP21 to simulate the left eye and right eye of people；
B: judge the position when Len focus and defocus of the cam lens mould group；
C: judge the current location of the Len with the moving direction of the determination motor；With
D: the mobile Len to the focal position completes focusing with blur-free imaging.
Wherein, the step C is further comprised the steps of:
C.1: judging whether the camera is in the focal position, if so then execute step C.5, if otherwise executing step
Suddenly C.4；
C.2: judging whether the Len is in preceding burnt position and thens follow the steps if not C.4 if so then execute step C.2；
C.3: it is mobile that the motor drives the Len to be biased to the rear burnt position；
C.4: it is mobile that the motor drives the Len to be biased to the preceding burnt position；With
C.5: the motor stops driving the Len mobile, to complete to focus.
It is noted that step included by above-mentioned steps C also obtains as following steps:
C.1: C.4 whether judgement is described thens follow the steps in focal position if so then execute step C.5 if not；
C.2: judging whether the Len is in the rear burnt position and thens follow the steps if not if so then execute step C.2
C.4；
C.3: it is mobile that the motor drives the Len to be biased to the preceding burnt position；
C.4: it is mobile that the motor drives the Len to be biased to the rear burnt position；With
C.5: the motor stops driving the Len mobile, to complete to focus.
It is noted that C.4 C.1 the step be a cyclic process to the step, i.e., the described motor passes through always
The current location of the Len is judged to determine and drive the moving direction of the Len until the Len moves to the focal position.
It is noted that when the T is in dynamic, the step A, the step B, the step C and the step
Rapid D is in cyclic process, and with the determination T, in different location, the motor is able to be judged according to the current location of the Len
Out to the driving direction of the Len.
The step A further include step A.1: pair of analysis the first image RP12 and the second image LP22
Than degree, to be able to obtain the first peak point 121 and second image of the contrast of the first image RP12
Second peak point 221 of the contrast of LP22 is located at the positional relationship that the same coordinate system is, wherein when first peak point
When 121 the first mark value 122 is equal with the second mark value 222 of second peak point 221, the Len is located at focus position
It sets, when the first mark value 122 of first peak point 121 is less than second mark value 222 of second peak point 221
When, the Len is in preceding burnt position, when first mark value 122 of first peak point 121 is greater than second peak value
The Len is in rear burnt position when second mark value 222 of point 221.
It will be further appreciated that more traditional passive type focal modes, the AF quick focusing method is able to accurately determine institute
It states Len and needs mobile direction, rather than just can determine that the Len needs to move with the rear burnt section by covering the preceding coke
Direction, and then the time of cam lens mould group focusing is greatly saved.
It will be further appreciated that the AF quick focusing method does not increase new portion on the basis of realizing auto-focusing
Part, so be able to adapt to electronic equipment, such as mobile phone, the development trend of microminaturization and be widely used.
Above content is enumerating for specific embodiments of the present invention, for the equipment and structure of wherein not detailed description, is answered
When being interpreted as that the existing common apparatus in this field and universal method is taken to be practiced.
The above embodiment of the present invention is only to illustrate that technical solution of the present invention is used simultaneously, only the column of technical solution of the present invention
It lifts, the technical solution and its protection scope being not intended to restrict the invention.Using equivalent technologies mean, equivalent apparatus etc. to this hair
The improvement of technical solution disclosed in bright claims and specification is considered to be without departing from claims of the present invention
And range disclosed in specification.
Claims (12)
1. a kind of AF quick focusing method, which is characterized in that the AF rapid focus mode the following steps are included:
A: the effective pixel area of sensitive chip is divided into region R and region L two parts after photographic subjects object, to simulate the left side of people
A column pixel below the region R and the region L is respectively seen as individually photosensitive by eye and right eye when obtaining picture
Chip exports the first image RP and the second image LP according to the region R and the region L respectively；
B: analysis the first image RP and the second image LP, judge cam lens mould group camera lens focus and from
Position when burnt, when the of contrast of first peak point less than the second image LP of the contrast of the first image RP
When two peak points, the camera lens is in preceding burnt position；
C: the current location of the camera lens is judged to determine the moving direction of motor；With
D: the mobile camera lens to the focal position completes focusing with blur-free imaging.
2. a kind of AF quick focusing method as described in claim 1, which is characterized in that the defocus still further comprises preceding coke
With rear coke, the focal position is located between the preceding burnt position and rear burnt position, when the camera lens is in defocus position, institute
Camera lens is stated to be able to be biased to the preceding burnt position under the driving of the motor or be biased to the rear burnt position movement to be moved to
Focal position is stated to complete focus.
3. a kind of AF quick focusing method as claimed in claim 2, which is characterized in that the step C is further comprised the steps of:
C.1: judging whether the camera lens is in the focal position, if so then execute step C.5, then follow the steps if not C.4；
C.2: judging whether the camera lens is in the preceding burnt position and thens follow the steps if not C.4 if so then execute step C.2；
C.3: it is mobile that the motor drives the camera lens to be biased to the rear burnt position；
C.4: it is mobile that the motor drives the camera lens to be biased to the preceding burnt position；With
C.5: the motor stops driving the camera lens mobile, to complete to focus.
4. a kind of AF quick focusing method as claimed in claim 2, which is characterized in that the step C is further comprised the steps of:
C.1: judging whether the camera lens is in focal position, if so then execute step C.5, then follow the steps if not C.4；
C.2: judging whether the camera lens is in the rear burnt position and thens follow the steps if not C.4 if so then execute step C.2；
C.3: it is mobile that the motor drives the camera lens to be biased to the preceding burnt position；
C.4: it is mobile that the motor drives the camera lens to be biased to the rear burnt position；With
C.5: the motor stops driving the camera lens mobile, to complete to focus.
5. a kind of AF quick focusing method as claimed in claim 3, which is characterized in that the step C.1 to the step C.4
For a cyclic process, i.e., the described motor passes through the current location for judging the camera lens always to determine the movement for driving the camera lens
Direction is until the camera lens moves to the focal position.
6. a kind of AF quick focusing method as claimed in claim 4, which is characterized in that the step C.1 to the step C.4
For a cyclic process, i.e., the described motor passes through the current location for judging the camera lens always to determine the movement for driving the camera lens
Direction is until the camera lens moves to the focal position.
7. a kind of AF quick focusing method as described in claim 1, which is characterized in that when the object is in dynamic,
The step A, the step B, the step C and the step D are in cyclic process, with the determination object in different positions
It is able to be judged the motor to the driving direction of the camera lens according to the current location of the camera lens when setting.
8. a kind of AF quick focusing method as claimed in claim 5, which is characterized in that when the object is in dynamic,
The step A, the step B, the step C and the step D are in cyclic process, with the determination object in different positions
It is able to be judged the motor to the driving direction of the camera lens according to the current location of the camera lens when setting.
9. a kind of AF quick focusing method as claimed in claim 6, which is characterized in that when the object is in dynamic,
The step A, the step B, the step C and the step D are in cyclic process, with the determination object in different positions
It is able to be judged the motor to the driving direction of the camera lens according to the current location of the camera lens when setting.
10. a kind of AF quick focusing method as claimed in claim 7, which is characterized in that the step A further include step A.1:
The contrast of the first image RP and the second image LP are analyzed, to be able to obtain the first image RP's
Second peak point of the contrast of the first peak point of contrast and the second image LP is located at position when the same coordinate system
Set relationship, wherein when the abscissa of first peak point is equal with the abscissa of second peak point, the camera lens position
In focal position, after when the abscissa of first peak point is greater than the abscissa of second peak point, the camera lens is in
Burnt position.
11. a kind of AF quick focusing method as claimed in claim 8, which is characterized in that the step A further include step A.1:
The contrast of the first image RP and the second image LP are analyzed, to be able to obtain the first image RP's
Second peak point of the contrast of the first peak point of contrast and the second image LP is located at position when the same coordinate system
Set relationship, wherein when the abscissa of first peak point is equal with the abscissa of second peak point, the camera lens position
In focal position, after when the abscissa of first peak point is greater than the abscissa of second peak point, the camera lens is in
Burnt position.
12. a kind of AF quick focusing method as claimed in claim 9, which is characterized in that the step A further include step A.1:
The contrast of the first image RP and the second image LP are analyzed, to be able to obtain the first image RP's
Second peak point of the contrast of the first peak point of contrast and the second image LP is located at position when the same coordinate system
Set relationship, wherein when the abscissa of first peak point is equal with the abscissa of second peak point, the camera lens position
In focal position, after when the abscissa of first peak point is greater than the abscissa of second peak point, the camera lens is in
Burnt position.
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| CN106773459B (en) * | 2016-12-16 | 2019-02-01 | 歌尔股份有限公司 | A kind of focusing method, device and camera for camera |
| WO2019061079A1 (en) * | 2017-09-27 | 2019-04-04 | 深圳市大疆创新科技有限公司 | Focusing processing method and device |
| CN107566741B (en) * | 2017-10-26 | 2020-04-14 | Oppo广东移动通信有限公司 | Focusing method, focusing device, computer readable storage medium and computer equipment |
| WO2019104508A1 (en) * | 2017-11-29 | 2019-06-06 | 深圳市大疆创新科技有限公司 | Image sensor, chip, image processing device, and related method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101918873A (en) * | 2008-02-13 | 2010-12-15 | 佳能株式会社 | Image forming apparatus |
| CN103842877A (en) * | 2011-09-30 | 2014-06-04 | 富士胶片株式会社 | Imaging device and focus parameter value calculation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4189647B2 (en) * | 2003-02-24 | 2008-12-03 | フジノン株式会社 | Auto focus system |
| JP2012234152A (en) * | 2011-04-19 | 2012-11-29 | Canon Inc | Imaging apparatus and control method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101918873A (en) * | 2008-02-13 | 2010-12-15 | 佳能株式会社 | Image forming apparatus |
| CN103842877A (en) * | 2011-09-30 | 2014-06-04 | 富士胶片株式会社 | Imaging device and focus parameter value calculation method |
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