CN103747185B - Zooming follow-up realizing method capable of enabling lens to shift with temperatures in auto-adaptive way - Google Patents
Zooming follow-up realizing method capable of enabling lens to shift with temperatures in auto-adaptive way Download PDFInfo
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Abstract
A zooming follow-up realizing method capable of enabling a lens to shift with temperatures in an auto-adaptive way relates to the field of video cameras. On account of the technical defect that the method for judging the current optimal lens curve according to the relationship between an accurate focusing position and an object distance is only suitable for lenses of which the shift hardly varies with the temperatures, the zooming follow-up realizing method comprises a zooming follow-up method and also comprises an initialization processing method and an optimal curve selecting method, wherein the shift value of the lens, which varies with the temperatures, is determined through the initialization processing method in a way that the optimal focusing position value of the same object distance in a wide-angle position at the current temperature is compared with an optimal focusing position value determined by a calibrated zooming follow-up curve provided by a lens manufacturer; according to the optimal curve selecting method, a focusing position correcting value is obtained after the optimal focusing position value determined by a zooming follow-up curve obtained through the zooming follow-up method is added to the shift value, and an optimal zooming follow-up curve is reversely inferred according to the focusing position correcting value and is used as a reference for next zooming follow-up operation. A clearer image is obtained through the movement of the lens according to new data in the zooming process, and the problem that the image becomes dizzy when the lens is moved according to original data is avoided.
Description
Technical field
The present invention relates to field of cameras.It is a kind of zoom follow-up implementation method with temperature drift for automatic adaptation camera lens.
Background technology
With the development further of microelectric technique, very large scale integration technology, the development day of digital imaging technology
Crescent is different, and digital camera gets more and more and occurs in daily life.And focusing technology is the pass of digital imaging products
Key, the domestic research to Techniques of Automatic Focusing has been achieved with some achievements, but main research focus be all static automatic
Focusing technology, the focusing technology not being directed to moving image is furtherd investigate.In practical engineering application, video camera needs to pass through
Zoom follows the tracks of a moving object, how to ensure object blur-free imaging in motion process, and zoom follow-up technology seems especially heavy
Will.One moving object steadily can rapidly be followed the tracks of using good zoom follow-up algorithm.
Zoom follow-up is a part for Techniques of Automatic Focusing, and in autofocus system, feedback control key is to determine focusing
The spike problem of evaluation function.Zoom follow-up algorithm is also obtained by the evaluation function value of relatively different focal positions
Optimal focal position.Zoom follow-up refers to change Jiao of system by the movement of zoom lens when carrying out zoom operation
Away from the focal length due to system changes, and imaging will not focus on original focusing plane, so moving in zoom lens
Need the position by adjusting focus lens while dynamic, so that scenery is focused on the image sensor during zoom.Its
Middle zoom follow-up curve (zoom follow-up curve also known as: lens curved, camera lens zoom curve or zoom curve) refers in a certain thing
Away from the range of each best focus position composition under different focal corresponding relation curve.The method realizing zoom follow-up is main
Have: look-up table, geometry zoom tracing, self adaptation zoom tracing etc., its core is all to obtain zoom follow-up curve and control
Focus lens are moved.
Zoom follow-up system architecture is as shown in figure 1, the view data collecting imageing sensor is sent at picture signal
Reason chip, image signal processing chip obtains image clearly evaluation function value after arranging view data, camera lens automatically controls mould
Root tuber is carried out controlled motor according to object selection value and is rotated, and reaches the effect of zoom follow-up.Wherein evaluation function refers to that image is clear
Image quantization is obtained a value by corresponding mathematical formulae by clear evaluation function, and when image is more clear, the value after quantization is got over
Greatly.
Zoom follow-up algorithm is the object selection value by comparing two width difference zoom curves, and evaluation function value is big
Curve is regarded as optimal zoom curve.
As shown in Fig. 2 wherein y-coordinate represents focal position, the positive direction of y-axis is the distant place focusing on to y-axis to lens curved
Negative direction be focus on nearly direction；X coordinate represents focal position, and the negative direction of x-axis is wide-angle direction, and the positive direction of x-axis is
Focal length direction.
The lens curved of demarcating of the different object distances being provided according to camera lens producer first simulates suitable lens curved, producer
The demarcation lens curved providing a simply reference value.Integrated optical camera lens includes zoom stepper motor and focuses on stepper motor,
While zoom motor rotates, in order to get a distinct image, focus motor also concomitant rotation, concrete rotate step number can directly from
The lens curved of current object distance obtains.For example whole clear during camera lens zoom in order to ensure the object under 1 meter of object distance, need
Focusing lens to be moved to corresponding focal position in 1 meter of zoom curve simultaneously.
As can be drawn from Figure 2 to draw a conclusion, lens curved multiple is bigger, discrete more serious.And under little multiple each camera lens
Curve is substantially to overlap.It is thus desirable to passing through to select a plurality of different camera lens bent according to accurate focal position and the relation of object distance
Line is only the optimum lenses curve of current object distance judging which bar lens curved.
When eyeglass shifts, focal length with focus on relation also can occur corresponding change, that is, zoom curve becomes
Change, the therefore original zoom curve preserving is inapplicable.
Above algorithm is to judge current optimum lenses curve based on the relation of accurate focal position and object distance, only suitable
Offset the camera lens little with temperature change for eyeglass.Algorithm is very poor to different camera lens adaptability, increased debugging volume production
Difficulty.It is thus desirable to proposing a kind of solution to solve the adaptability problem existing.
Content of the invention
In sum, the purpose of the present invention is that relation for accurate focal position and object distance to judge currently optimal mirror
Cephalic flexure line, is only applicable to the technical deficiency little with the camera lens of temperature change for the eyeglass skew, and a kind of adaptation automatically proposing
Camera lens is with the zoom follow-up implementation method of temperature drift.
For solving the present invention, technical problem is proposed, the technical scheme of employing is: a kind of camera lens that automatically adapts to is with temperature drift
Zoom follow-up implementation method, include: obtain zoom and follow up the zoom follow-up method that curve controlled focus lens automatically focus on；
It is characterized in that: also include init processing method and best curve system of selection；Described init processing method adopts
The demarcation zoom follow-up curve that wide-angle position is provided with camera lens producer to best focus position value under the Current Temperatures of same object distance
Determine best focus position value be compared, determine camera lens vary with temperature after deviant；Described best curve selects
Method is the best focus position value and described deviant phase that the zoom follow-up curve obtaining described zoom follow-up method determines
Plus after, draw focal position correction value, according to the anti-release of focal position correction value optimal zoom follow-up curve, become as next
The reference of follow-up operation again.
Described focal position correction value extrapolates optimal zoom follow-up curve by look-up table with comparing size.
The invention has the benefit that because the eyeglass focal position of camera lens can vary with temperature generation skew, with demarcation
Parameter there is deviation, so zoom follow-up curve can accordingly change.Because camera lens is when wide-angle, the camera lens depth of field
Good, focusing need not be adjusted it is possible to see the object of different object distances, measure the deviant of current lens when wide-angle by mistake
Difference is little.According to deviant and original zoom follow-up curve, obtain eyeglass optimal with the different object distances correspondence after temperature drift
Zoom follows up curve, and counter after present convergence location is corrected pushes away optimal zoom follow-up curve.Or directly by present convergence position
Put and be worth to the focal position after a correction plus skew, push away best curve using the focal position after correction is counter.Skew
Value imports original data and will reduce error in current system for the original data.Will with new data moving lens during zoom
Obtain the image becoming apparent from, it is to avoid lead to image to thicken with legacy data moving lens.
Increase the adaptability to different camera lenses, the debugging during reduction development ＆ production and volume production difficulty, improve zoom mistake
Image definition in journey, improves customer experience.
Brief description
Fig. 1 zoom follow-up system construction drawing；
The zoom follow-up curve map of the original demarcation of Fig. 2；
The zoom follow-up implementation method process chart of Fig. 3 present invention；
Fig. 4 zoom follow-up curvilinear motion comparison diagram.
Specific embodiment
Below in conjunction with accompanying drawing and concrete case, technical scheme is further described.
The zoom follow-up implementation method of the present invention is increase initialization process on the basis of traditional zoom follow-up method
Method and best curve system of selection.Traditional zoom follow-up method obtains zoom follow-up curve controlled focus lens and automatically gathers
Jiao, does not consider best focus position value with temperature offset factor.
Described init processing method is using best focus position value under wide-angle position is to the Current Temperatures of same object distance
The best focus position value that the demarcation zoom follow-up curve being provided with camera lens producer is determined is compared, and determines that camera lens becomes with temperature
Deviant after change；As shown in Figure 4 it is assumed that under 10 meters of object distances when wide-angle the best focus position of original demarcation be
A, obtaining after temperature change demarcating best focus position under 10 meters of object distances is b, and it is exactly that camera lens varies with temperature that wherein a deducts b
Deviant c afterwards.Its center line n is the zoom follow-up curve that the original object distance demarcated is 10m, and line m is to be revised according to deviant c
Counter afterwards push away draw corresponding object distance be 10m zoom follow up curve.According to current best focus position pass through look-up table with than
Extrapolate optimal zoom follow-up curve compared with size.For example zoom follow-up curve a is c in the focal position under front focal length, zoom
Follow-up curve b is d in the focal position under front focal length, and wherein current best focus position is e, and the difference of wherein c and e compares d
Little with the difference of e, then zoom follow up curve a be zoom follow up the optimal zoom that curve a and zoom follow up between curve b with
Enter curve.When zoom follow-up moves focus motor along zoom follow-up curve a, image will become more apparent.
Described best curve system of selection is that the zoom follow-up curve determination of described zoom follow-up method acquisition is optimal
After focal position value is added with described deviant, draw focal position correction value, optimal according to the anti-release of focal position correction value
Zoom follow-up curve, as the reference of next zoom follow-up operation.
Follow up curve in conjunction with deviant c and original zoom, by revise the zoom obtaining the different object distances after eyeglass skew with
Enter curve, present convergence location can be pushed away optimal zoom follow-up curve using zoom follow-up curve after correction is counter.Or directly
Present convergence location is obtained the focal position after a correction plus deviant c, pushes away using the focal position after correction is counter
Good zoom follow-up curve.Deviant c is imported original data and will reduce error in current system for the original data.Zoom mistake
The image that will obtain becoming apparent from new data moving lens in journey, it is to avoid lead to image to become mould with legacy data moving lens
Paste.
Because, under little multiple, lens curved is substantially overlap, does not select curve and can meet holding image clearly
Requirement, but when two adjacent curve focal position gap ratios are larger, curve ratio is more discrete.When the curve selecting is not
During best curve, image starts to fog it is necessary to again select curve.Therefore zoom follow-up needs an optimal zoom follow-up
The handling process of Curve selection, so that zoom follow-up procedural image can become apparent from.
When entering best curve selection process:
1. first have to judgement and redirect direction, record evaluation function value a of current curves simultaneously；If direction flag p is 1
, trade-off curve upwards, otherwise downward trade-off curve.
2. record current curves evaluation function value b.If a is more than b, then follow-up curve ratio b is corresponding for a corresponding zoom
More preferably, curve adjustment direction is incorrect for zoom follow-up curve, and direction flag p needs to adjust, so direction flag p is taken
Instead；Otherwise b corresponding zoom follow-up curve ratio a corresponding zoom follow-up curve is more preferably, and curve adjustment direction is correctly it is not necessary to adjust
Direction.
The core of the present invention is the mistake increasing the deviant that a measurement camera lens varies with temperature in zoom follows up algorithm
Journey, simultaneously by the reference of deviant alternatively curve, reduces the error of trade-off curve, allows image during zoom become more clear
Clear, improve customer experience.
Claims (1)
1. a kind of automatic adaptation camera lens, with the zoom follow-up implementation method of temperature drift, includes: obtains zoom follow-up curve control
The zoom follow-up method that focus lens processed focus on automatically；It is characterized in that: also include init processing method and best curve
System of selection；Described init processing method is using best focus position value under wide-angle position is to the Current Temperatures of same object distance
The best focus position value that the demarcation zoom follow-up curve being provided with camera lens producer is determined is compared, and determines that camera lens becomes with temperature
Deviant after change；Described best curve system of selection is that the zoom follow-up curve obtaining described zoom follow-up method determines
Best focus position value be added with described deviant after, draw focal position correction value, push away according to focal position correction value is counter
Go out optimal zoom follow-up curve, as the reference of next zoom follow-up operation；Described focal position correction value is passed through to table look-up
Method extrapolates optimal zoom follow-up curve with comparing size.
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| CN106161941B (en) * | 2016-07-29 | 2022-03-11 | 南昌黑鲨科技有限公司 | Automatic double-camera focus tracking method and device and terminal |
| CN107147905B (en) * | 2017-06-08 | 2020-06-05 | Oppo广东移动通信有限公司 | Camera module testing method and device and computer readable storage medium |
| CN108924415B (en) * | 2018-06-27 | 2021-02-02 | 亿嘉和科技股份有限公司 | Method for carrying out consistency calibration on individual focusing difference of zoom camera |
| CN110839126B (en) * | 2018-08-15 | 2021-07-20 | 杭州海康威视数字技术股份有限公司 | Zoom tracking method and device and zoom camera |
| CN111722355A (en) * | 2019-03-19 | 2020-09-29 | 杭州海康微影传感科技有限公司 | Method and device for focusing thermal imaging lens based on temperature compensation |
| CN111294511B (en) * | 2020-02-06 | 2021-12-14 | 北京小米移动软件有限公司 | Focusing method and device of camera module and storage medium |
| CN112601012B (en) * | 2020-12-07 | 2022-03-01 | 深圳市维海德技术股份有限公司 | Zoom follow-up method, device and computer readable storage medium |
| CN114710603B (en) * | 2022-03-24 | 2024-02-13 | 深圳市维海德技术股份有限公司 | Temperature drift correction method, system, terminal equipment and medium |
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