CN106950793B - A kind of real-time method for obtaining motorized zoom lens imaging viewing field angle - Google Patents
A kind of real-time method for obtaining motorized zoom lens imaging viewing field angle Download PDFInfo
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- CN106950793B CN106950793B CN201710160330.0A CN201710160330A CN106950793B CN 106950793 B CN106950793 B CN 106950793B CN 201710160330 A CN201710160330 A CN 201710160330A CN 106950793 B CN106950793 B CN 106950793B
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- focal length
- zoom lens
- length value
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- field angle
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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
- G03B43/00—Testing correct operation of photographic apparatus or parts thereof
Abstract
Disclose a kind of method for obtaining motorized zoom lens imaging viewing field angle in real time, comprising: S1, the imaging viewing field for changing motorized zoom lens obtain N number of focal length value and field angle corresponding with each focal length value；N is the positive integer not less than 2；S2, according to N group field angle and focal length value, be fitted imaging viewing field angle and the functional relation of focal length value of motorized zoom lens；S3, the functional relation is inquired based on the current focal length value of motorized zoom lens, determines the current imaging viewing field angle of motorized zoom lens.The present invention can the current field angle angle value of quick obtaining, real-time is good, and the accuracy and accuracy of acquired results are high.
Description
Technical field
The present invention relates to video monitorings and Optoelectronic Countermeasure Technology field, more particularly to a kind of acquisition motorized zoom lens in real time
The method at imaging viewing field angle.
Background technique
Background of related of the invention is illustrated below, but these explanations might not constitute it is of the invention existing
Technology.
The application fields such as imaging are linked with important to passive ranging, laser night vision in the imaging viewing field angle for obtaining camera lens
Meaning.It, can inverting target by obtaining imaging viewing field angle and known target baseline size in monocular baseline passive ranging
Distance.
In laser night vision technical field, when adjusting imaging viewing field, need to obtain imaging viewing field angular data value in real time, in turn
The angle of divergence of laser is adjusted, real-time linkage mechanism is formed.
General focal length zoom lens is motorized adjustment mode, is embedded with driving motor and zoom potentiometer and (or counts
Device), with record Different Logic focal length value (potential value or count value, reference can be made to Fuji can company motorized zoom lens D60 ×
12.5A-V41 type monitoring camera).For example potentiometer, the potentiometer value can be converted to digital signal, input master after analog-to-digital conversion
Processor；For example count value then directly feeds back to primary processor.Especially in imaging and passive imaging technical field, the field angle of acquisition
Data precision by directly affect target apart from inversion accuracy, it is therefore desirable to solve zoom lens field angle high-precision obtain it is difficult
Topic.
Summary of the invention
It, can be fast it is an object of the invention to propose a kind of method for obtaining motorized zoom lens imaging viewing field angle in real time
The current field angle angle value of speed, effective acquisition.
The method that the present invention obtains motorized zoom lens imaging viewing field angle in real time, comprising:
S1, the imaging viewing field for changing motorized zoom lens, obtain N number of focal length value and view corresponding with each focal length value
Rink corner；N is the positive integer not less than 2；
S2, according to N group field angle and focal length value, the function at the imaging viewing field angle and focal length value that are fitted motorized zoom lens closes
System；
S3, the functional relation is inquired based on the current focal length value of motorized zoom lens, determines that motorized zoom lens are current
Imaging viewing field angle.
Preferably, field angle includes horizontal field of view angle and vertical field of view angle.
Preferably, focal length value is the partial pressure value by motor-driven lens focal length partial pressure potential device by production when modulus A/D transformation
Raw logic focal length value.
Preferably, change the imaging viewing field of motorized zoom lens in step S1 according to ascending or descending order.
Preferably, step S2 further comprises:
N group field angle and focal length value are arranged in the way of field angle ascending or descending order；
For any one group of data, if being between focal length value therein and focal length value sequence before being arranged in this group of data
Existing nonmonotonicity then rejects field angle and focal length value in current group data.
Preferably, the value of N is 2-3 times of the zoom magnification of motorized zoom lens.
Preferably, if being H × V, power zoom apart from the imaging object plane size that motorized zoom lens distance is camera lens at R
The visual field of camera lens meets following relationship:
In formula, θHFor the horizontal field of view angle of motorized zoom lens, θVFor the vertical field of view angle of motorized zoom lens, unit is
Degree °, f are physics focal length value；F, the unit of H, V and R are mm.
Preferably, if motorized zoom lens focal length is f, detector target surface is having a size of h × v, then the view of motorized zoom lens
Field meets following relationship:
In formula, θHFor the horizontal field of view angle of motorized zoom lens, θVFor the vertical field of view angle of motorized zoom lens, unit is
Degree °, f are physics focal length value；H, the unit of v, f are mm.
Preferably, the imaging viewing field angle in step S2 using Fourier's fit approach fitting motorized zoom lens and focal length value
Functional relation.
Detailed description of the invention
The specific embodiment part provided and referring to the drawings, the features and advantages of the present invention will become more
It is readily appreciated that, in the accompanying drawings:
Fig. 1 is to show the method flow schematic diagram of the invention for obtaining motorized zoom lens imaging viewing field angle in real time；
Fig. 2 is logic focal length value and physics focal length value corresponding relationship.
Specific embodiment
Exemplary embodiments of the present invention are described in detail with reference to the accompanying drawings.Illustrative embodiments are retouched
It states merely for the sake of demonstration purpose, and is definitely not to the present invention and its application or the limitation of usage.
As shown in Figure 1, the method that the present invention obtains motorized zoom lens imaging viewing field angle in real time, comprising:
S1, the imaging viewing field for changing motorized zoom lens, obtain N number of focal length value and view corresponding with each focal length value
Rink corner；N is the positive integer not less than 2；
S2, according to N group field angle and focal length value, the function at the imaging viewing field angle and focal length value that are fitted motorized zoom lens closes
System；
S3, the functional relation is inquired based on the current focal length value of motorized zoom lens, determines that motorized zoom lens are current
Imaging viewing field angle.
The present invention first demarcates the parameter of motorized zoom lens, using N group data fitting motorized zoom lens
The functional relation at imaging viewing field angle and focal length value, step is simple, and the accuracy and accuracy of gained functional relation are high.Work as needs
When obtaining the imaging viewing field angle of motorized zoom lens, the present invention can be inquired based on the current logic focal length value of motorized zoom lens
The functional relation fitted determines imaging viewing field angle corresponding with current logic focal length value, and real-time is good, the field angle of acquisition
Data precision is high.
Focal length value in the present invention, which can be, to be become by the partial pressure value of motor-driven lens focal length partial pressure potential device by modulus A/D
The logic focal length value generated when changing.Logic focal length value is not the physics focal length value of motor-driven lens, logic focal length value and physics focal length
Value is one-to-one relationship, can be evaded since zoom lens physics focal length value is difficult to the problem obtained in real time.
As shown in Fig. 2, motor-driven lens servo motor rotates when lens focusing, the variable resistance pointer on potentiometer is mobile, from
And divider resistance value changes, so as to cause voltage value VrChange,
Wherein VHIt is reference voltage, R is range resistance, and r is variable resistance pointer sampling resistor, VrIt is partial pressure value, since r is with object
It manages the variation of focal length value and changes, at one-to-one relationship, therefore, logic focal length value and physics focal length value are closed at one-to-one correspondence
System.When calibration, logic focal length value is only recorded.
Calibration times N can be selected with the type of motorized zoom lens, such as the value of N is the change of motorized zoom lens
2-3 times of burnt multiple.The times N of calibration is more, the functional relation at imaging viewing field angle and focal length value based on nominal data fitting
It is more accurate.
When demarcating motorized zoom lens parameter, the imaging that can change motorized zoom lens according to ascending or descending order is regarded
?.For example, in laboratory conditions, visual field is adjusted from big to small, the corresponding logic focal length value of different visual fields is successively recorded.It can
To determine the imaging viewing field angle under each imaging viewing field according to the geometrical relationship of imaging.In some embodiments, according to electronic change
The target surface size and current focus value of zoom lens, determine the field angle under current imaging viewing field.
Preferably, if being H × V, power zoom apart from the imaging object plane size that motorized zoom lens distance is camera lens at R
The visual field of camera lens meets following relationship:
In formula, θHFor the horizontal field of view angle of motorized zoom lens, θVFor the vertical field of view angle of motorized zoom lens, unit is
Degree °, f are physics focal length value；F, the unit of H, V and R are mm.
Since under image planes design conditions, physics focal length value f is relatively difficult to obtain in real time, it is possible to by calibration object plane at
As acquisition of information visual field angle value.If motorized zoom lens focal length is f, detector target surface is having a size of h × v, then motorized zoom lens
Visual field meet following relationship:
In formula, θHFor the horizontal field of view angle of motorized zoom lens, θVFor the vertical field of view angle of motorized zoom lens, unit is
Degree °, f are physics focal length value；H, the unit of v, f are mm.
With the increase or reduction at imaging viewing field angle, monotonicity is presented in corresponding focal length value.Therefore, in some embodiments
In, step S2 further comprises:
N group field angle and focal length value are arranged in the way of field angle ascending or descending order；
For any one group of data, if being between focal length value therein and focal length value sequence before being arranged in this group of data
Existing nonmonotonicity then rejects field angle and focal length value in current group data.
If nonmonotonicity is presented between focal length value therein and focal length value sequence before being arranged in this group of data, show this
For group data there are large error, error can be measured or calculate by being rejected, and improve imaging viewing field angle and the focal length value of fitting
The accuracy of functional relation.
It can imaging viewing field angle using Fourier's fit approach fitting motorized zoom lens and focal length value in step S2
Functional relation.For example, by data fitting is carried out in the CFTOOL function of N group field angle and focal length value input matlab software,
Fourier's fit approach is selected in fitting function, adjustment fourier function is fitted order, enables effectively to be fitted, finally record
The fourier function expression formula.Those skilled in the art can select suitable fourier function fitting rank according to the actual situation
Number, fourier function fitting order is higher, and gained measurement accuracy is higher.
Although referring to illustrative embodiments, invention has been described, but it is to be understood that the present invention does not limit to
The specific embodiment that Yu Wenzhong is described in detail and shows, without departing from claims limited range, this
Field technical staff can make various changes to the illustrative embodiments.
Claims (8)
1. a kind of method for obtaining motorized zoom lens imaging viewing field angle in real time, characterized by comprising:
S1, the imaging viewing field for changing motorized zoom lens, obtain N number of focal length value and field angle corresponding with each focal length value；
N is the positive integer not less than 2；
S2, according to N group field angle and focal length value, be fitted imaging viewing field angle and the functional relation of focal length value of motorized zoom lens；
S3, the functional relation is inquired based on the current focal length value of motorized zoom lens, determine motorized zoom lens it is current at
As field angle；
Wherein, if motorized zoom lens focal length is f, detector target surface is having a size of h × v, then the visual field of motorized zoom lens meets
Following relationship:
In formula, θHFor the horizontal field of view angle of motorized zoom lens, θVFor the vertical field of view angle of motorized zoom lens, unit is degree °, f
For physics focal length value；H, the unit of v, f are mm.
2. the method as described in claim 1, which is characterized in that the field angle includes horizontal field of view angle and vertical field of view angle.
3. the method as described in claim 1, which is characterized in that the focal length value is by motor-driven lens focal length partial pressure potential device
Partial pressure value logic focal length value for generating when being converted by modulus A/D.
4. the method as described in claim 1, which is characterized in that change motorized zoom lens according to ascending or descending order in step S1
Imaging viewing field.
5. the method as described in claim 1, which is characterized in that step S2 further comprises:
N group field angle and focal length value are arranged in the way of field angle ascending or descending order；
For any one group of data, if being presented between focal length value therein and focal length value sequence before being arranged in this group of data non-
Monotonicity then rejects field angle and focal length value in current group data.
6. the method as described in claim 1, which is characterized in that the value of N is the 2-3 of the zoom magnification of motorized zoom lens
Times.
7. the method as described in claim 1, which is characterized in that if being the imaging of camera lens at R apart from motorized zoom lens distance
Object plane size is H × V, then the visual field of motorized zoom lens meets following relationship:
In formula, θHFor the horizontal field of view angle of motorized zoom lens, θVFor the vertical field of view angle of motorized zoom lens, unit is degree °；
H, the unit of V and R is mm.
8. the method as described in claim 1, which is characterized in that be fitted power zoom using Fourier's fit approach in step S2
The imaging viewing field angle of camera lens and the functional relation of focal length value.
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| CN111025321B (en) * | 2019-12-28 | 2022-05-27 | 奥比中光科技集团股份有限公司 | Variable-focus depth measuring device and measuring method |
| CN112666542A (en) * | 2020-12-24 | 2021-04-16 | 山东神戎电子股份有限公司 | Passive distance measuring method of thermal imager |
| CN114299167B (en) * | 2022-03-11 | 2022-07-26 | 杭州灵西机器人智能科技有限公司 | Monocular calibration method, system, device and medium of zoom lens |
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| JP2004029838A (en) * | 2003-07-11 | 2004-01-29 | Sharp Corp | Camera focusing method and camera |
| CN101034240A (en) * | 2006-03-10 | 2007-09-12 | 鸿富锦精密工业（深圳）有限公司 | Automatic focusing method used for testing camera module group |
| CN101191994A (en) * | 2006-12-01 | 2008-06-04 | 鸿富锦精密工业（深圳）有限公司 | Optical look angle measuring systems and its measuring method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004029838A (en) * | 2003-07-11 | 2004-01-29 | Sharp Corp | Camera focusing method and camera |
| CN101034240A (en) * | 2006-03-10 | 2007-09-12 | 鸿富锦精密工业（深圳）有限公司 | Automatic focusing method used for testing camera module group |
| CN101191994A (en) * | 2006-12-01 | 2008-06-04 | 鸿富锦精密工业（深圳）有限公司 | Optical look angle measuring systems and its measuring method |
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