CN103246131A - Method of realizing three-dimensional multi-region automatic focusing by utilizing lens-incline-controllable focusing motor - Google Patents
Method of realizing three-dimensional multi-region automatic focusing by utilizing lens-incline-controllable focusing motor Download PDFInfo
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- CN103246131A CN103246131A CN2013101869537A CN201310186953A CN103246131A CN 103246131 A CN103246131 A CN 103246131A CN 2013101869537 A CN2013101869537 A CN 2013101869537A CN 201310186953 A CN201310186953 A CN 201310186953A CN 103246131 A CN103246131 A CN 103246131A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
- H04N23/673—Focus control based on electronic image sensor signals based on contrast or high frequency components of image signals, e.g. hill climbing method
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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
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
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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
- G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
- G03B3/10—Power-operated focusing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/62—Control of parameters via user interfaces
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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
- G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
- G03B2205/0007—Movement of one or more optical elements for control of motion blur
- G03B2205/0023—Movement of one or more optical elements for control of motion blur by tilting or inclining one or more optical elements with respect to the optical axis
Abstract
The invention discloses a method of realizing three-dimensional multi-region automatic focusing by utilizing a lens-incline-controllable focusing motor, comprising the following steps of A, carrying out z axis automatic focusing; B, carrying out Rx axis automatic focusing or Ry axis automatic focusing; and C, carrying out Ry axis automatic focusing or Rx axis automatic focusing. Compared with the traditional automatic focusing method, the method provides more lens motion dimensionalities for controlling, and can realize three-dimensional multi-region automatic focusing through effectively controlling the position (the first dimensionality) of a lens and the dip angles of two orthogonal directions (the second and third dimensionalities). When an object inclines until the depth of field cannot cover the whole object simultaneously, the focusing on all regions can be automatically realized, manual focusing is not needed, and the method has the advantages that the reliability is higher, the speed is rapider, the precision is higher, and no training is needed.
Description
Technical field
The present invention discloses a kind of camera lens focusing method, particularly a kind of utilization can control the automatic method of focusing of focusing motor realization 3 dimension multi-regions that camera lens tilts.
Background technology
Impacting mobile phone market along with what smart mobile phone covered the sky and the earth, all be smart mobile phone most likely in the mobile phone, and camera function almost is the function of general intelligence mobile phone indispensability.At present, 5,000,000 or above high-pixel camera head universal day by day in smart mobile phone, make the quality of mobile phone photograph more and more near digital camera.But, high-pixel mobile phone camera of the prior art does not but contain some optics and the mechanical part of digital camera, disappearance on this hardware, can allow the effect of taking pictures of shooting mobile phone than digital camera difference undoubtedly, more specifically, present shooting mobile phone has only an autofocus motor to realize nearly burnt burnt translation function far away at most, makes camera lens close or away from imageing sensor to what being controlled to of camera lens mostly was the one-dimensional degree.And large-scale camera arrangement, as slr camera, have more complicated mechanical devices control camera lens and carry out the motion of various dimensions with respect to imageing sensor, for example utilize the camera lens translation to realize optics anti-shake (OIS), and utilize the camera lens support with favored policy to realize moving axle photography etc.
For the photographic effect that makes the mobile phone with camera function is further drawn close to digital camera, many internationally recognizable mobile phone focusing motor manufacturer all begins to research and develop three focusing motor, and has developed based on the anti-shake focusing motor of the optics of camera lens translation.But these motors are because uncontrollable camera lens produces the inclination with respect to imageing sensor, therefore can't adjust the angle of camera lens optical axis and imageing sensor equally.When the focal plane of camera lens and image sensor plane are not parallel (during as camera lens focal plane deflection, or simultaneously during the different object of shooting distance), these motors then uncontrollable camera lens are realized clear picture focusing in the whole imaging scope.In addition, the structure of these motors is very complicated, and volume and power consumption are bigger, also fails to promote in smart mobile phone market and comes.
On the other hand, though at large-scale camera arrangement, move lens shaft and released for many years, for fear of the weight and volume problem of camera lens, up to the present, the mechanism of optical axis do not occur changing automatically, this has limited realizes the automatic 3 dimension multi-regions possibility of focusing automatically.
Summary of the invention
Can not change optical axis automatically at the above-mentioned camera lens of mentioning of the prior art, can not realize the automatic 3 dimension multi-regions shortcoming of focusing automatically, the invention provides a kind of utilization and can control the automatic method of focusing of focusing motor realization 3 dimension multi-regions that camera lens tilts, it passes through image analysis algorithm, find the optimization two dimension inclination angle of camera lens, so that captured image effect reaches optimum, solved because the image corner fuzzy problem under camera lens focal plane and the not parallel situation of image sensing plane; Obtain the problem of clear focusing when having solved the different several object of in picture shooting distance simultaneously, optimize the sharpness of whole image.
The present invention solves the technical scheme that its technical matters adopts: a kind of utilization can be controlled the focusing motor that camera lens tilts and realize the 3 dimension multi-regions method of focusing automatically, and this method comprises the steps: A, carry out the z axle focuses automatically; B, carry out the Rx axle and focus automatically or carry out the Ry axle and focus automatically; C, carry out the Ry axle and focus automatically or carry out the Rx axle and focus automatically.
The technical scheme that the present invention solves its technical matters employing further comprises:
When described z axle was focused automatically, concrete steps were as follows:
The stroke of A-1, change camera lens is to stroke 1;
Whether A-2, the image settling position on image sensor by waiting for a regular time, or are observed image and are decided image stable;
A-3, picked-up image;
The focusing district that A-4, calculating x axle and y axle have a common boundary or the sharpness of region-wide focusing district image;
A-5, change stroke to next stroke 2, repeating step A-2 to A-4, until the stroke number more than or equal to the total kilometres number;
A-6, find out the stroke that has maximum sharpness, determine that the trip is best stroke;
A-7, change camera lens stroke are best stroke.
When described Rx axle was focused automatically, concrete steps were as follows:
Pitch angle on B-1, the change camera lens Rx direction;
Whether B-2, the image settling position on image sensor by waiting for a regular time, or are observed image and are decided image stable;
B-3, picked-up image;
B-4, the focusing district of calculating on the positive y axle reach the sharpness of bearing the focusing district image on the y axle;
B-5, change pitch angle on the Rx direction to next pitch angle, repeating step B-2 to B-4, until the stroke number more than or equal to total Rx direction tilt angle number;
B-6, find out the pitch angle on the Rx direction that has maximum sharpness, determine that this pitch angle is the pitch angle on the best Rx direction;
Pitch angle on B-7, the change camera lens Rx direction is the pitch angle on the best Rx direction.
When described Ry axle was focused automatically, concrete steps were as follows:
Pitch angle on C-1, the change camera lens Ry direction;
Whether C-2, the image settling position on image sensor by waiting for a regular time, or are observed image and are decided image stable;
C-3, picked-up image;
C-4, the focusing district of calculating on the positive x axle reach the sharpness of bearing the focusing district image on the x axle;
C-5, change pitch angle on the Ry direction to next pitch angle, repeating step C-2 to C-4, until the stroke number more than or equal to total Ry direction tilt angle number;
C-6, find out the pitch angle on the Ry direction that has maximum sharpness, determine that this pitch angle is the pitch angle on the best Ry direction;
Pitch angle on C-7, the change camera lens Ry direction is the pitch angle on the best Ry direction.
The invention has the beneficial effects as follows: the present invention focuses automatically with tradition and compares, the dimension of more control camera motions is provided, energy is by effectively controlling the position (the 1st dimension) of camera lens and the inclination angle (the 2nd, 3 dimension) of two orthogonal directionss, and realization 3 dimension multi-regions are focused automatically.
Fail to cover simultaneously whole target when target tilts to the depth of field in the past, can only manually move axle with family, realized region-wide focusing.The present invention then can realize region-wide focusing automatically, need not manual realization, have more high reliability, faster, more accurate, need not training etc. a bit.
In addition, can control the focusing motor that camera lens tilts among the present invention, can also realize that optics is anti-shake, the function that high-end large-scale camera arrangements such as optical axis verticality compensation just possess.
The present invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
The cam stereo structural representation of Fig. 1 for adopting among the present invention.
The camera cross-sectional view of Fig. 2 for adopting among the present invention.
Fig. 3 is preceding light path synoptic diagram for the present invention adjusts.
Fig. 4 adjusts back light path synoptic diagram for the present invention.
Fig. 5 is regional partition structure synoptic diagram for the present invention focuses.
Fig. 6 is process flow diagram of the present invention.
Fig. 7 is the process flow diagram of focusing automatically of z axle among the present invention.
Fig. 8 is the process flow diagram of focusing automatically of Rx axle among the present invention.
Fig. 9 is the process flow diagram of focusing automatically of Ry axle among the present invention.
Among the figure, 101-camera lens, 102-motor, the 103-imageing sensor, 201-target, the single convex lens head of 202-, the 204-imaging, the single convex lens head of 212-direction, the new imaging of 214-, the focusing district that 301-x axle and y axle have a common boundary, focusing district on the positive x axle of 302-, the focusing district on the positive y axle of 303-, the focusing district on the negative x axle of 304-, focusing district on the negative y axle of 305-, the region-wide focusing of 306-district.
Embodiment
Present embodiment is the preferred embodiment for the present invention, and other all its principles are identical with present embodiment or approximate with basic structure, all within protection domain of the present invention.
Please referring to accompanying drawing 1 and accompanying drawing 2, the motor that adopts among the present invention is for controlling the focusing motor that camera lens tilts, the camera that adopts among the present invention mainly comprises camera lens 101, can control focusing motor 102 and image sensor 103 that camera lens 101 tilts, camera lens 101 is under the control of motor 102, degree of freedom is three-dimensional at least, and comprising that Z axle translation direction, Rx direction of principal axis rotate and the Ry direction of principal axis rotates, described camera lens 101 can be made up of one or more eyeglasses.
The camera structure of the employing among the present invention specifically utilizes of the prior artly controls the focusing motor that camera lens tilts (for example the patent No. is that the United States Patent (USP) of US2009/0237517 and the patent No. are 200810090504.1 Chinese patent) or other actuating devices are realized 3 dimension multi-region focus function.Because the moving element of described motor is comparatively light and handy, the size of actuation element and power consumption can allow general small-sized flow device (as mobile phone) accept.
Be mainly a kind of utilization among the present invention and can control the automatic method of focusing of focusing motor realization 3 dimension multi-regions that camera lens tilts, please in conjunction with referring to accompanying drawing 3 and accompanying drawing 4, in the accompanying drawing 3, when target 201 tilts, when single convex lens head 202 did not tilt, imaging 204 may can't region-widely focus on because image exceeds the depth of field.In the present embodiment, described target can be made up of one or more objects.
Single convex lens head 202 in this method is equal to the camera lens 101 in single-lens system.See also accompanying drawing 4, by motor 102, adjust camera lens 202 pitch angle, according to husky nurse law (Scheimpflug principle is referring to GB Patent No. 1139), reach new single convex lens head direction 212, and new imaging 214, reach region-wide focusing.
Please in conjunction with referring to accompanying drawing 5, in the present embodiment, adopt the multi-region focusing to realize in region-wide focusing process, in the present embodiment, the multi-region focusing comprises five districts, be respectively 304 districts on the positive x axle, 302 districts on the negative x axle, 303 districts on the positive y axle, 305 districts on the negative y axle, and in 301 districts of x axle and y axle boundary, or 306 region-wide (namely being whole image).The present invention is not limited to five districts in the specific implementation, can for three the district or more than, and the district the position, position and the direction of x axle and y axle also do not have hard and fast rule.
Please referring to accompanying drawing 6,3 Wei Wu districts among the present invention are the method for focusing automatically, and concrete steps are as follows: at first, and at 301 districts or 306 district's images, carrying out the z axle focuses automatically, this is the automatic focusing of approximate tradition 1 dimension, then, goes or 305 district's images at 303, carrying out the Rx axle focuses automatically, at last, at 302 or 304 district's images, carry out the Ry axle and focus automatically.
Please in conjunction with referring to accompanying drawing 7, in the present embodiment, the z axle method of focusing is automatically realized by image analysis algorithm, and is specific as follows:
One, changes the stroke of camera lens to stroke 1.Stroke in the present embodiment is defined as the relative position of camera lens on the z axle, and the reference position of stroke can be for image sensor 103 or the position of camera lens when not having motor not switch on.
Two, image settling position on image sensor 103, can be by waiting for a regular time, or observe image and decide image whether stable, because when camera lens 202 positions fixedly the time, the sharpness of image can't settle out, usually, camera lens 202 is when moving to certain position rapidly, because factors such as inertia, camera lens 202 also can be near this position swing a period of time, the image of this moment also can't be focused clear, therefore need wait for a period of time, and is clear up to image, the concrete stand-by period is relevant with the multiple parameters of total system and lens performance, be approximately about tens to up to a hundred milliseconds, in a word, more short more good.
Three, picked-up image.
Four, calculate the sharpness (sh) of 301 districts or 306 district's images.
Five, change stroke to next stroke 2, in the present embodiment, a stroke of common camera lens 202 is generally about tens microns, and conventional selects 30 ~ 80 microns, repeating step two to four, until the stroke number more than or equal to total kilometres number (nh).
Six, find out the stroke that has maximum sharpness (sh), determine that the trip is best stroke.
Seven, changing stroke is best stroke.
Please in conjunction with referring to accompanying drawing 8, the Rx axle in the present embodiment is the method for focusing automatically, the Rx axle automatically method and the z axle of focusing the method for focusing is close automatically, concrete steps are as follows:
One, the pitch angle on the change camera lens Rx direction.
Two, wait for that a regular time is stable until image.
Three, picked-up image.
Four, calculate the sharpness (ui) of 303 districts and 305 district's images.
Five, next pitch angle is arrived at the pitch angle that changes on the Rx direction, in the present embodiment, a pitch angle of common camera lens 202 can be selected 3 ~ 10 °, repeating step two to four, and the pitch angle number on the Rx direction is more than or equal to total Rx direction tilt angle number (ni).
Six, find out pitch angle on the Rx direction that has maximum sharpness (ui), this pitch angle is the pitch angle on the best Rx direction.
Seven, the stroke of change camera lens is the pitch angle on the best Rx direction.
Please in conjunction with referring to accompanying drawing 9, the Ry axle in the present embodiment is the method for focusing automatically, the Ry axle automatically the method for focusing and Rx axle the method for focusing is very approaching automatically, concrete steps are as follows:
One, the pitch angle on the change Ry direction.
Two, wait for that a regular time is stable until image.
Three, picked-up image.
Four, calculate (vj) of 302 districts and 304 district's images.
Five, next pitch angle is arrived at the pitch angle that changes on the Ry direction, in the present embodiment, a pitch angle of common camera lens 202 can be selected 3 ~ 10 °, repeating step two to four, until the pitch angle number on the Ry direction more than or equal to the pitch angle number (nj) on total Ry direction.
Six, find out pitch angle on the Ry direction that has maximum sharpness (vj), this pitch angle is the pitch angle on the best Ry direction.
Seven, the change stroke is the pitch angle on the best Ry direction.
Above-mentioned flow process is a specific embodiment of the present invention, but when specifically implementing, detailed process and step can be changed, as Rx axle focusing and the Ry axle precedence of focusing automatically automatically.
The present invention focuses automatically with tradition and compares, and the dimension of more control camera motions is provided, can be by effectively controlling the position (the 1st dimension) of camera lens and the inclination angle (the 2nd, 3 dimension) of two orthogonal directionss, and realization 3 dimension multi-regions are focused automatically.
Fail to cover simultaneously whole target when target tilts to the depth of field in the past, can only manually move axle with family, realized region-wide focusing.The present invention then can realize region-wide focusing automatically, need not manual realization, have more high reliability, faster, more accurate, need not advantages such as training.
In addition, can control the focusing motor that camera lens tilts among the present invention, can also realize that optics is anti-shake, the function that high-end large-scale camera arrangements such as optical axis verticality compensation just possess.
Claims (4)
1. a utilization can be controlled the automatic method of focusing of focusing motor realization 3 dimension multi-regions that camera lens tilts, and it is characterized in that: described method comprises the steps:
A, carry out the z axle and focus automatically;
B, carry out the Rx axle and focus automatically or carry out the Ry axle and focus automatically;
C, carry out the Ry axle and focus automatically or carry out the Rx axle and focus automatically.
2. utilization according to claim 1 can be controlled the automatic method of focusing of focusing motor realization 3 dimension multi-regions that camera lens tilts, and it is characterized in that: when described z axle was focused automatically, concrete steps were as follows:
The stroke of A-1, change camera lens is to stroke 1;
Whether A-2, the image settling position on image sensor by waiting for a regular time, or are observed image and are decided image stable;
A-3, picked-up image;
The focusing district that A-4, calculating x axle and y axle have a common boundary or the sharpness of region-wide focusing district image;
A-5, change stroke to next stroke 2, repeating step A-2 to A-4, until the stroke number more than or equal to the total kilometres number;
A-6, find out the stroke that has maximum sharpness, determine that the trip is best stroke;
A-7, change camera lens stroke are best stroke.
3. utilization according to claim 1 can be controlled the automatic method of focusing of focusing motor realization 3 dimension multi-regions that camera lens tilts, and it is characterized in that: when described Rx axle was focused automatically, concrete steps were as follows:
Pitch angle on B-1, the change camera lens Rx direction;
Whether B-2, the image settling position on image sensor by waiting for a regular time, or are observed image and are decided image stable;
B-3, picked-up image;
B-4, the focusing district of calculating on the positive y axle reach the sharpness of bearing the focusing district image on the y axle;
B-5, change pitch angle on the Rx direction to next pitch angle, repeating step B-2 to B-4, until the stroke number more than or equal to total Rx direction tilt angle number;
B-6, find out the pitch angle on the Rx direction that has maximum sharpness, determine that this pitch angle is the pitch angle on the best Rx direction;
Pitch angle on B-7, the change camera lens Rx direction is the pitch angle on the best Rx direction.
4. utilization according to claim 1 can be controlled the automatic method of focusing of focusing motor realization 3 dimension multi-regions that camera lens tilts, and it is characterized in that: when described Ry axle was focused automatically, concrete steps were as follows:
Pitch angle on C-1, the change camera lens Ry direction;
Whether C-2, the image settling position on image sensor by waiting for a regular time, or are observed image and are decided image stable;
C-3, picked-up image;
C-4, the focusing district of calculating on the positive x axle reach the sharpness of bearing the focusing district image on the x axle;
C-5, change pitch angle on the Ry direction to next pitch angle, repeating step C-2 to C-4, until the stroke number more than or equal to total Ry direction tilt angle number;
C-6, find out the pitch angle on the Ry direction that has maximum sharpness, determine that this pitch angle is the pitch angle on the best Ry direction;
Pitch angle on C-7, the change camera lens Ry direction is the pitch angle on the best Ry direction.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310186953.7A CN103246131B (en) | 2013-05-20 | 2013-05-20 | Utilization can control the focusing motor that camera lens tilts and realize the method for 3 dimension multi-region auto-focusing |
| PCT/CN2014/073328 WO2014187187A1 (en) | 2013-05-20 | 2014-03-12 | Method for realizing tilt-shift photography and three-dimensional multi-area auto-focus via touch screen operation |
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| CN201310186953.7A CN103246131B (en) | 2013-05-20 | 2013-05-20 | Utilization can control the focusing motor that camera lens tilts and realize the method for 3 dimension multi-region auto-focusing |
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| CN103246131B CN103246131B (en) | 2016-06-01 |
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| CN103246131B (en) | 2016-06-01 |
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