CN105573016B - A kind of auto-focusing window method of adjustment and system - Google Patents
A kind of auto-focusing window method of adjustment and system Download PDFInfo
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- CN105573016B CN105573016B CN201510974527.9A CN201510974527A CN105573016B CN 105573016 B CN105573016 B CN 105573016B CN 201510974527 A CN201510974527 A CN 201510974527A CN 105573016 B CN105573016 B CN 105573016B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/18—Focusing aids
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Abstract
The invention discloses a kind of auto-focusing window method of adjustment and systems.Initial focusing window is determined by area-of-interest, its field angle is calculated by image height and image distance in every bit on focusing window boundary, new image distance is obtained by new lens location when lens location changes in focus process, the image height for obtaining new focusing window boundary point is calculated with new image distance and the field angle of initial focusing window boundary point, new focusing window is formed, part of the new focusing window boundary beyond image-receptive boundary image boundary where replaces.The present invention solves the problems, such as that magnification change causes as drifting about during digital camera auto-focusing, can unknown material away from the case where rapidly calculate as drift value caused by magnification change, and then adjust focusing window, realize that scenery follows.This method is not influenced by image fog-level, is calculated simply, robustness is good.
Description
Technical field
The invention belongs to digital imaging technology field, it is related to a kind of auto-focusing window method of adjustment and system.
Background technique
During digital camera auto-focusing, usually select interested region for window of focusing in viewfinder by user
Mouthful, focusing evaluation then is carried out to the image in focusing window by camera, to judge best focus position.However, such as Fig. 1 institute
Show, with the back-and-forth motion of camera lens in focus process, imaging magnification changes, the focusing window for causing user to input
The picture of interior scenery drifts about, thus the problems such as generating inconsistent focus target, focusing inaccuracy.
Traditional auto-focusing window selection does not consider the drift of picture caused by magnification change in focus process generally, quiet
In scape shooting, no longer change after focusing window is selected.
Be presently available for solve focusing window in scenery picture drift about the prior art first is that moving subjects tracking
Technology.This kind of technology is primarily based on Computer Vision Detection and goes out the physical feature to match in adjacent two field pictures, then calculates
The displacement of moving subjects out, and then corresponding adjustment is made to focusing window, realize moving subjects tracking.The disadvantage of this type of technology is that
On the one hand calculate complicated, on the other hand big for fuzzy quantity its robustness of image is poor, it is difficult to realize characteristic matching.
Therefore, the prior art lacks a kind of targeted, quick, steady solution.
Summary of the invention
In order to solve the problems, such as background technique, the invention proposes a kind of auto-focusing window method of adjustment and it is
System solves the technical issues of magnification change in focus process causes the picture of object scene to drift about.
The technical solution adopted by the invention is as follows:
One, a kind of magnification change leads to the auto-focusing window method of adjustment as drifting about, and as shown in Figure 4 includes following step
It is rapid:
1) initial focusing window is determined by area-of-interest；
2) for every bit on initial focusing window boundary, its field angle is calculated by the image height and image distance of each point；
3) in focus process, lens location is in the following ways updated focusing window when changing: by new camera lens
Position obtains new image distance, calculates separately the new focusing of acquisition with the field angle of new image distance and each boundary point of initial focusing window
The image height of window edge point, connects these boundary points, forms new focusing window, to realize following to the image of drift.
The lens location, which changes, refers to camera lens moving along optical axis axial direction.Focusing window boundary changes with lens location,
It is unrelated with picture material itself.
If new focusing window boundary exceeds the boundary of image-receptive, new focusing window boundary exceeds image-receptive
The part on boundary image boundary where replaces, that is, gives up in focusing window beyond image boundary part.
The initial focusing window shape, size, position select to change all in accordance with user.
Arbitrary Boundaries point S in the step 2)1Field angle θ be calculated using the following equation:
Wherein, h1For boundary point S1Image height, d1The image distance of boundary point when for first frame image, i.e., initial focusing window
Image distance.
New focusing window boundary point S in the step 3)2Image height h2It is calculated using the following equation:
h2=d2·tanθ (4)
Wherein, d2For new image distance, θ is initial focusing window boundary point S1Field angle.
Magnification change causes as the problem of drift during the method for the present invention is directed to digital camera auto-focusing.
Two, a kind of magnification change leads to the auto-focusing window adjustment system as drifting about:
It further include difference as shown in figure 5, including focusing evaluation module, camera lens, lens driving module and search module
The focusing window computing module being connect with focusing evaluation module and lens driving module, the initial focusing window transmission of user's input
To focusing window computing module, focusing window computing module receives the image distance data that lens driving module transfer comes, and combines
Image height processing in initial focusing window obtains new focusing window, and new focusing window is finally input to focusing evaluation module
In.
The lens driving module is the motor for driving camera lens to be moved forward and backward along optical axis.
It is described focusing evaluation module according to focusing window computing module transmit come new focusing window carry out focusing evaluation,
Search module is sent by evaluation result, the displacement of camera lens is determined by search module, controls lens driving module moving lens.
The Atomatic focusing method process of focusing window variation is as shown in figure 3, the method for the present invention is related to wherein in the prior art
The adjustment of focusing window.As shown in Figure 1, existing digital camera makes focus target exist in focusing, by being moved forward and backward camera lens
At sharply defined image on fixed image-receptive, this focusing mode make unknown material away from the case where can not calculate by magnifying power
Caused picture drift value.The method of the present invention moves the focusing model of variation mainly for camera lens shown in Fig. 1 along optical axis direction, simplifies
The mobile model of image-receptive as shown in Figure 2 is obtained afterwards.Fig. 2's of the present invention simplifies focusing model, and main thought is will be right
The movement of camera lens replaces with the movement of image-receptive in burnt model, can quickly calculate according to this model as drift value,
To adjust to focusing window, realize that scenery follows.
The beneficial effects of the present invention are:
The present invention includes a kind of focusing model of simplification, can quickly, steadily be calculated based on this model as drift value,
To realize that focusing window follows object scene to adjust.
The present invention can unknown material away from the case where find out as drift value, and then adjust focusing window, realize scenery with
With.The method of the present invention is unrelated with picture material itself, is not influenced by image fog-level, has and calculates simply, robustness is good
The advantages that.
Detailed description of the invention
Through the following detailed description taken in conjunction with the accompanying drawings, above and other of the invention aspect, features and advantages will be by more clear
Understand to Chu, in which:
Fig. 1 is the focusing model of camera lens position change；
Fig. 2 is simplified model of focusing used in the present invention；
Fig. 3 is the Atomatic focusing method flow chart of focusing window variation；
Fig. 4 is that the method for the present invention focusing window adjusts flow chart；
Fig. 5 is present system module annexation figure；
Fig. 6 is initial focusing window of the embodiment of the present invention when lens location continuously changes；
Fig. 7 is the trace performance image of one of state when lens location continuously changes of the embodiment of the present invention；
Fig. 8 be the embodiment of the present invention when lens location continuously changes the two of state trace performance image；
Fig. 9 be the embodiment of the present invention when lens location continuously changes the three of state trace performance image；
Figure 10 be the embodiment of the present invention when lens location continuously changes the four of state trace performance image；
Figure 11 be the embodiment of the present invention when lens location continuously changes the five of state trace performance image；
Figure 12 is initial focusing window of the embodiment of the present invention when object scene is close to image border
Figure 13 be the embodiment of the present invention except object scene floats to image when one of state trace performance image.
Figure 14 be the embodiment of the present invention except object scene floats to image when state two trace performance image.
In figure: 1, image-receptive, 2, camera lens.
Specific embodiment
Exemplary embodiment of the present invention is described in detail with reference to the accompanying drawings.However, the present invention can be with many differences
Form implement, and should not be construed as limited to the embodiments set forth herein.Above-mentioned different form includes to different fields
Scape focusing, and it is not limited to the scene in embodiment.Above-mentioned different form further include different shapes and sizes, position it is initial right
Burnt window, and it is not limited to the initial focusing window in embodiment.
The embodiment of the present invention is as follows:
The auto-focusing window adjustment of exemplary embodiment of the present, process are executed for the focusing window shown in Fig. 6
Referring to Fig. 3 and Fig. 4, system block diagram is referring to Fig. 5.Specific implementation step are as follows:
1) it is rectangle that user, which chooses scenery S interested, focusing window in Fig. 6, includes image the 715th row to the 1100th row,
The pixel of 960th column to the 1330th column, focusing window have vertex P1(715,960)、P2(715,1330)、P3(1100,960)、P4
(1100,1330)。
2) for rectangle focusing window, it is only necessary to which carrying out calculating to its four vertex can be obtained new focusing window.By
Formula 1 successively calculates vertex P1、P2、P3、P4Field angle θ1、θ2、θ3、θ4.Specifically, d1To obtain image distance when Fig. 6
50.0mm, i.e. image-receptive 1 arrive the distance of camera lens 2, h1For the image height on vertex, the i.e. distance on vertex to picture centre.
3) such as Fig. 7, moving lens obtain next frame image, new image distance d are calculated according to lens location at this time2=
42.1mm.Again by formula 2, with the calculated field angle θ of step 2)1、θ2、θ3、θ4Successively calculate focusing window vertex in Fig. 6
The corresponding image height in Fig. 7, and then obtain its position, i.e. P1'(726,959)、P2'(726,1387)、P3'(1172,959)、
P4'(1172,1387).With P1'、P2'、P3'、P4' it is vertex, determine new focusing window.New focusing window is moved together with S
Dynamic and amplification, realizes scenery and follows.Since the window edge of the method for the present invention is calculated by image distance and field angle, with image
Content itself is unrelated, so not influenced by image fog-level, has robustness.
Fig. 8 shows two followability of the state when image focusing continuously changes according to an exemplary embodiment of the present
Energy.This state image distance is 43.8mm, and it is the 724th row to 1157 rows, the 959th column to that focusing window, which is calculated, through this method
1375 column.
Fig. 9 shows three followability of the state when image focusing continuously changes according to an exemplary embodiment of the present
Energy.This state image distance is 45.4mm, and it is the 722nd row to 1142 rows, the 959th column to that focusing window, which is calculated, through this method
1363 column.
Figure 10 shows according to an exemplary embodiment of the present when image focusing continuously changes the four of state and follows
Performance.This state image distance is 47.0mm, and it is the 719th row to 1127 rows, the 959th column to that focusing window, which is calculated, through this method
1352 column.
Figure 11 shows according to an exemplary embodiment of the present when image focusing continuously changes the five of state and follows
Performance.This state image distance is 48.6mm, and it is the 717th row to 1112 rows, the 960th column to that focusing window, which is calculated, through this method
1340 column.
It is can be seen that from Fig. 7 to Figure 11 since lens location continuously changes during the focusing process, when image defocus, foundation
The method of the present invention can steadily follow the picture of object scene.
Figure 12 shows the initial focusing window when object scene is close to image border according to an exemplary embodiment of the present
Mouthful.This state image distance is 50.0mm, and initial focusing window is the 660th row to 880 rows, the 20th column to the 320th column.
Figure 13 shows according to an exemplary embodiment of the present one of state when except object scene floating to image
Trace performance image.This state image distance be 45.7mm, through this method step 1) to 3) be calculated focusing window be the 661st row arrive
900 rows, the -62nd column to the 264th column.Casting out beyond focusing window behind image boundary part, is obtained is the 661st row to 900 rows, the
1 column to the 264th column.
Figure 14 shows according to an exemplary embodiment of the present one of state when except object scene floating to image
Trace performance image.This state image distance be 42.1mm, through this method step 1) to 3) be calculated focusing window be the 662nd row arrive
917 rows, the -129th column to the 218th column.Casting out beyond focusing window behind image boundary part, is obtained is the 662nd row to 917 rows,
1st column to the 218th column.
When can see object scene according to an exemplary embodiment of the present invention from Figure 12 to Figure 14 and floating to except image
Trace performance, since lens location is during the focusing process far from image-receptive, image magnification ratio increases, and is floated with object scene
When moving on to except image, method can follow the remaining picture of object scene according to the present invention.It can be seen that the technology of the present invention significant effect
It is prominent, it can quickly, steadily calculate as drift value, realize that focusing window follows object scene to adjust.
Claims (7)
1. a kind of auto-focusing window method of adjustment, it is characterised in that method includes the following steps:
1) initial focusing window is determined by area-of-interest；
2) for every bit on initial focusing window boundary, its field angle is calculated by the image height and image distance of each point；
3) in focus process, when camera lens (2) position change, is in the following ways adjusted focusing window: by new camera lens position
It sets and obtains new image distance, calculate separately the new focusing window of acquisition with the field angle of new image distance and each boundary point of initial focusing window
The image height of mouth boundary point, connects the boundary point of acquisition, forms new focusing window, to realize following to the image of drift；
Arbitrary Boundaries point S in the step 2)1Field angle θ be calculated using the following equation:
Wherein, h1For boundary point S1Image height, d1For the image distance of first frame image；
New focusing window boundary point S in the step 3)2Image height h2It is calculated using the following equation:
h2=d2·tanθ (2)
Wherein, d2For new image distance, θ is initial focusing window boundary point S1Field angle.
2. a kind of auto-focusing window method of adjustment according to claim 1, it is characterised in that: the lens location changes
Refer to camera lens moving along optical axis axial direction.
3. a kind of auto-focusing window method of adjustment according to claim 1, it is characterised in that: if new focusing window side
Boundary exceeds the boundary of image, and part of the new focusing window boundary beyond image boundary image boundary where replaces, that is, gives up
Exceed image boundary part in focusing window.
4. a kind of auto-focusing window method of adjustment according to claim 1, it is characterised in that: the initial focusing window
Mouth-shaped, size, position select to change all in accordance with user.
5. a kind of auto-focusing window adjusts system, including focusing evaluation module, camera lens, lens driving module and search mould
Block, it is characterised in that:
It further include the focusing window computing module being connect respectively with focusing evaluation module and lens driving module, user inputs first
Beginning focusing window is transferred to focusing window computing module, and focusing window computing module receives the picture that lens driving module transfer comes
Away from data, and the image height processing in initial focusing window is combined to obtain new focusing window, finally inputs new focusing window
Into focusing evaluation module；
Specifically processing obtains new focusing window in the following ways:
For every bit on initial focusing window boundary, its field angle is calculated by the image height and image distance of each point；
In focus process, when camera lens (2) position change, is in the following ways adjusted focusing window: by new lens location
New image distance is obtained, is calculated separately with the field angle of new image distance and each boundary point of initial focusing window and obtains new focusing window
The image height of boundary point connects the boundary point of acquisition, forms new focusing window, to realize following to the image of drift；
Wherein Arbitrary Boundaries point S1Field angle θ be calculated using the following equation:
Wherein, h1For boundary point S1Image height, d1For the image distance of first frame image；
New focusing window boundary point S2Image height h2It is calculated using the following equation:
h2=d2·tanθ (4)
Wherein, d2For new image distance, θ is initial focusing window boundary point S1Field angle.
6. a kind of auto-focusing window according to claim 5 adjusts system, it is characterised in that: the lens driving mould
Block is the motor for driving camera lens to be moved forward and backward along optical axis.
7. a kind of auto-focusing window according to claim 5 adjusts system, it is characterised in that: the focusing evaluation module
According to focusing window computing module transmit come new focusing window carry out focusing evaluation, send search mould for evaluation result
Block is determined the displacement of camera lens by search module, controls lens driving module moving lens.
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| CN106777363A (en) * | 2017-01-22 | 2017-05-31 | 广东小天才科技有限公司 | Photographing search method and device for mobile terminal |
| CN109510939A (en) * | 2017-09-15 | 2019-03-22 | 中兴通讯股份有限公司 | ROI method of adjustment, device and the storage medium of camera scaling focusing |
| CN107613204B (en) * | 2017-09-28 | 2020-08-28 | 努比亚技术有限公司 | Focusing area adjusting method, terminal and computer storage medium |
| CN108197299B (en) * | 2018-01-24 | 2020-07-24 | 广东小天才科技有限公司 | Photographing and question searching method and system based on handheld photographing equipment |
| CN108322726A (en) * | 2018-05-04 | 2018-07-24 | 浙江大学 | A kind of Atomatic focusing method based on dual camera |
| JP6641572B1 (en) * | 2018-08-24 | 2020-02-05 | エスゼット ディージェイアイ テクノロジー カンパニー リミテッドＳｚ Ｄｊｉ Ｔｅｃｈｎｏｌｏｇｙ Ｃｏ．，Ｌｔｄ | Determination device, control device, imaging device, determination method, and program |
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