CN107911612A - A kind of camera automatic focusing method and apparatus - Google Patents
A kind of camera automatic focusing method and apparatus Download PDFInfo
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- CN107911612A CN107911612A CN201711400984.2A CN201711400984A CN107911612A CN 107911612 A CN107911612 A CN 107911612A CN 201711400984 A CN201711400984 A CN 201711400984A CN 107911612 A CN107911612 A CN 107911612A
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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
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D3/00—Control of position or direction
- G05D3/12—Control of position or direction using feedback
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Abstract
The present invention discloses a kind of camera automatic focusing method and apparatus, the method carries out scene modeling first, the modeling data collection being made of azimuth and object distance is established for different holder azimuths, when equipment works, focal length, azimuth determine object distance, image distance and focus uncompensation distance according to monitoring objective, since object distance, image distance and focal length are fixed, it have also contemplated that temperature-compensating, monitor camera only focuses on the target for needing to monitor, not danced in the air etc. by rainy weather, the weather that snows, mosquito influences, the error for avoiding autofocus system from occurring.
Description
Technical field
The present invention relates to a kind of camera automatic focusing method and apparatus, belong to field of intelligent video surveillance.
Background technology
Video monitoring camera auto-focusing algorithm is generally basede on image contrast and maximizes strategy, is running into some special feelings
During condition, such as rainy weather, the weather that snows, mosquito dance in the air etc. and to influence, and this kind of autofocus system is often made a fault.Example
Such as, monitoring target is in distant view position, but autofocus system gathers focus point on raindrop nearby, snowflake, mosquito,
So as to produce focal error.
The content of the invention
The defects of for the prior art, the present invention provide a kind of ` auto focusing methods and device, solve rain, snow, dust storm etc.
Under weather condition, the automatic focus issues of monitor camera.
In order to solve the technical problem, technology and scheme that the present invention uses are：A kind of camera automatic focusing method,
Comprise the following steps：S01）, scene modeling, scene modeling unit sends specific length F to lens zoom unit, lens zoom
Lens focus is adjusted to specific length F, temperature compensation unit and calculates focusing uncompensation distance E according to current lens focal length F by unit,
Reference point location (α [i], β [i]) is sent to cradle head control unit, cradle head control unit and adjusts holder by scene modeling unit
To reference point location, automatic focus control unit according to auto-focusing algorithm detection calculate to focus-image distance v [i], and according into
As formula 1/u+1/v=1/f calculates current object distance u [i], scene modeling unit preservation datum mark modeling data (α [i], β
[i], u [i]), selection afterwards has the azimuthal datum mark of different holders, and corresponding modeling is built for each datum mark
Data set { (α [i], β [i], u [i]), 1≤i≤N }, scene modeling unit sends modeling data collection to scene modeling
Data cell；S02）, equipment in the operating condition, policer operation unit and scene modeling data cell need when receiving monitoring objective
The focal length f and holder azimuth (α, β) wanted, scene modeling data cell are concentrated using interpolation algorithm from the modeling data of storage
Select the corresponding object distance u in holder azimuth (α, β), and object distance u is sent to policer operation unit, policer operation unit is by mirror
Head focal length f is pass on to lens zoom unit, and lens zoom unit adjusts lens focus to f is focused on needed for monitoring objective, by cloud
Platform azimuth (α, β) sends to cradle head control unit, cradle head control unit and adjusts holder to azimuth needed for monitoring objective
(α, β), object is sent to lens focusing unit, focusing unit away from u and calculates image distance v, temperature-compensating root according to object distance u
Focusing uncompensation distance e is aligned according to current lens focal length f, system completes target according to gathering v and focusing uncompensation distance e and focused
Journey.
Camera automatic focusing method of the present invention is, it is specified that length F is camera lens maximum focal length f_max.
Camera automatic focusing method of the present invention, temperature compensation unit calculate the mistake of focusing uncompensation distance according to focusing on
Cheng Wei：Temperature compensation unit setting focal length compensation table { (f [i], e [i])：I=1,2 ..., n }, given focal length f meets f [i]≤f
＜ f [i+1], the corresponding uncompensation distance of focal length is tried to achieve using interpolation method.
Camera automatic focusing method of the present invention, temperature compensation unit calculate the mistake of focusing uncompensation distance according to focusing on
Cheng Wei：Temperature compensation unit setting focal length compensation table { (f [i], e [i])：I=1,2 ..., n }, given focal length f meets f [i]≤f
＜ f [i+1], the corresponding uncompensation distance e of focal length f=(e [i+1]-e [i])/(f [i+1]-f is tried to achieve using linear interpolation method
[i])*(f-f[i])。
Camera automatic focusing method of the present invention, scene modeling unit are made according to gridding method selection total-grid intersection point
On the basis of point.
Camera automatic focusing method of the present invention, modeling data collection and prison of the scene modeling data cell based on storage
Control target needed for azimuth, using bilinear interpolation algorithm calculate object away from.
The invention also discloses a kind of camera automatic focusing device, including lens zoom unit, lens focusing unit, temperature
Spend compensating unit, cradle head control unit, automatic focus control unit, scene modeling unit, policer operation unit and scene modeling
Data cell, scene modeling unit are controlled with lens zoom unit, lens focusing unit, cradle head control unit, automatic focus on respectively
Unit communication connection processed, for sending the focusing specific length that scene modeling needs to lens zoom unit, cradle head control unit
With holder azimuth, temperature compensation unit is connected with lens focusing unit and lens zoom unit communication respectively, temperature-compensating list
Member calculates focusing uncompensation distance according to focometer, and automatic focus control unit calculates object distance according to focal length and image distance and feeds back object distance
To scene modeling unit, scene modeling unit is connected with scene modeling data unit communication, for by holder azimuth and object distance
The modeling data collection of composition is stored in scene modeling data cell；Scene modeling data cell and policer operation unit can receive
Focal length and holder azimuth needed for the monitoring objective of external world's input, scene modeling data cell is according to holder azimuth from storage
Modeling data concentrate selection and the matched object distance in holder azimuth and be transmitted to policer operation unit, policer operation unit and mirror
Head zoom unit, lens focusing unit, the connection of cradle head control unit communication, for by the focal length needed for monitoring objective, object distance and
Holder azimuth is transmitted to lens zoom unit, lens focusing unit and cradle head control unit, and camera lens border unit is burnt by camera lens
Image distance is calculated according to object distance, focal length away from focusing, lens focusing unit needed for monitoring objective is adjusted to, temperature compensation unit is according to Jiao
Away from focusing uncompensation distance is calculated, holder is adjusted to azimuth needed for monitoring objective by cradle head control unit, so as to complete target pair
Burnt process.
Beneficial effects of the present invention：The method of the invention carries out scene modeling first, for different holder azimuths
The modeling data collection being made of azimuth and object distance is established, when equipment works, focal length, azimuth determine according to monitoring objective
Object distance, image distance and uncompensation distance is focused, since object distance, image distance and focal length are fixed, it is also considered that temperature-compensating, monitor camera is only
Focusing on needs the target that monitors, and not danced in the air etc. by rainy weather, the weather that snows, mosquito influences, and avoids autofocus system from occurring
Error.
Brief description of the drawings
Fig. 1 is the functional block diagram of device of the present invention.
Embodiment
The present invention is further illustrated with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
The present embodiment discloses a kind of camera automatic focusing method, as shown in Figure 1, this method comprises the following steps：S01）, scene
Specific length F is sent to lens zoom unit, lens zoom unit and adjusts lens focus to rule by modeling, scene modeling unit
Measured length F, temperature compensation unit calculate focusing uncompensation distance E according to current lens focal length F, and scene modeling unit is by datum mark position
Put (α [i], β [i]) to send to cradle head control unit, cradle head control unit adjusts holder to reference point location, automatic to focus on control
Unit processed is calculated to focus-image distance v [i] according to auto-focusing algorithm detection, and is calculated according to imaging formula 1/u+1/v=1/f
Current object distance u [i], scene modeling unit preserve datum mark modeling data (α [i], β [i], u [i]), and selection afterwards has not
With the azimuthal datum mark of holder, for each datum mark build corresponding modeling data collection (α [i], β [i], u [i]),
1≤i≤N }, scene modeling unit sends modeling data collection to scene modeling data cell；S02）, equipment work shape
Under state, policer operation unit and scene modeling data cell receive the focal length f needed during monitoring objective and holder azimuth (α,
β), scene modeling data cell concentrates that to select holder azimuth (α, β) corresponding using interpolation algorithm from the modeling data of storage
Object distance u, and object distance u is sent to policer operation unit, policer operation unit and passs on lens focus f to lens zoom unit,
Lens zoom unit adjusts lens focus to f is focused on needed for monitoring objective, and holder azimuth (α, β) is sent to holder control
Unit processed, cradle head control unit adjust holder to azimuth (α, β) needed for monitoring objective, and object is sent to camera lens away from u
Focus unit, focusing unit calculates image distance v according to object distance u, temperature-compensating according to current lens focal length f align focusing compensation away from
From e, system completes target focus process according to gathering v and focusing uncompensation distance e.
, it is specified that length F is camera lens maximum focal length f_max in the present embodiment.
In the present embodiment, the process that temperature compensation unit calculates focusing uncompensation distance according to focusing on is：Temperature compensation unit
Set focal length compensation table { (f [i], e [i])：I=1,2 ..., n }, given focal length f meets f [i]≤f ＜ f [i+1], utilizes interpolation
Method tries to achieve the corresponding uncompensation distance of focal length.
Temperature compensation unit, which can also be adopted, alternatively calculates focusing uncompensation distance, its process is：Temperature-compensating
Unit setting focal length compensation table { (f [i], e [i])：I=1,2 ..., n }, given focal length f meets f [i]≤f ＜ f [i+1], utilizes
Linear interpolation method tries to achieve the corresponding uncompensation distance e of focal length f=(e [i+1]-e [i])/(f [i+1]-f [i]) * (f-f [i]).
In the present embodiment, scene modeling unit selects total-grid intersection point as datum mark according to gridding method.
In the present embodiment, azimuth needed for modeling data collection and monitoring objective of the scene modeling data cell based on storage,
Using bilinear interpolation algorithm calculate object away from.The bilinear interpolation method has been the prior art, and the present embodiment is no longer tired
State.
Embodiment 2
The present embodiment discloses a kind of camera automatic focusing device, including lens zoom unit, lens focusing unit, temperature-compensating
Unit, cradle head control unit, automatic focus control unit, scene modeling unit, policer operation unit and scene modeling data sheet
Member, scene modeling unit respectively with lens zoom unit, lens focusing unit, cradle head control unit, automatic focus control unit
Communication connection, for sending focusing specific length and the holder that scene modeling needs to lens zoom unit, cradle head control unit
Azimuth, temperature compensation unit are connected with lens focusing unit and lens zoom unit communication respectively, temperature compensation unit according to
Focal length calculates focusing uncompensation distance, and automatic focus control unit calculates object distance according to focal length and image distance and object distance is fed back to scene
Modeling unit, scene modeling unit are connected with scene modeling data unit communication, for form holder azimuth and object distance
Modeling data collection is stored in scene modeling data cell；Scene modeling data cell and policer operation unit can receive extraneous defeated
The focal length needed for monitoring objective entered and holder azimuth, modeling of the scene modeling data cell according to holder azimuth from storage
Selection is with the matched object distance in holder azimuth and being transmitted to policer operation unit in data set, policer operation unit and lens zoom
Unit, lens focusing unit, the connection of cradle head control unit communication, for by the focal length needed for monitoring objective, object distance and holder side
Parallactic angle is transmitted to lens zoom unit, lens focusing unit and cradle head control unit, and lens focus is adjusted to by camera lens border unit
Focused on needed for monitoring objective, lens focusing unit calculates image distance according to object distance, focal length, and temperature compensation unit is calculated according to focal length
Go out uncompensation distance of focusing, holder is adjusted to azimuth needed for monitoring objective by cradle head control unit, so as to complete target focus process.
Described above is only that the basic principle of the present invention and preferred embodiment, those skilled in the art do according to the present invention
The improvement and replacement gone out, belongs to protection scope of the present invention.
Claims (7)
- A kind of 1. camera automatic focusing method, it is characterised in that：Comprise the following steps：S01）, scene modeling, scene modeling list Specific length F is sent to lens zoom unit, lens zoom unit and adjusts lens focus to specific length F, temperature and mend by member Repay unit and focusing uncompensation distance E is calculated according to current lens focal length F, scene modeling unit is by reference point location (α [i], β [i]) Send to cradle head control unit, cradle head control unit and adjust holder to reference point location, automatic focus control unit is according to certainly Dynamic focusing algorithm detection is calculated to focus-image distance v [i], and calculates current object distance u [i] according to imaging formula 1/u+1/v=1/f, Scene modeling unit preserves datum mark modeling data (α [i], β [i], u [i]), and selection is azimuthal with different holders afterwards Datum mark, corresponding modeling data collection { (α [i], β [i], u [i]), 1≤i≤N } is built for each datum mark, Scene modeling unit sends modeling data collection to scene modeling data cell；S02）, equipment in the operating condition, policer operation Unit and scene modeling data cell receive the focal length f and holder azimuth (α, β) needed during monitoring objective, scene modeling number Concentrated according to unit using interpolation algorithm from the modeling data of storage and select the corresponding object distance u in holder azimuth (α, β), and by thing Sent away from u to policer operation unit, policer operation unit and pass on lens focus f to lens zoom unit, lens zoom unit Lens focus is adjusted to f is focused on needed for monitoring objective, holder azimuth (α, β) is sent to cradle head control unit, holder control Unit processed adjusts holder to azimuth (α, β) needed for monitoring objective, and object is sent to lens focusing unit, focusing away from u Unit calculates image distance v according to object distance u, and temperature-compensating aligns focusing uncompensation distance e according to current lens focal length f, system according to Gathering v and focusing uncompensation distance e complete target focus process.
- 2. camera automatic focusing method according to claim 1, it is characterised in that：Specific length F is maximum burnt for camera lens Away from f_max.
- 3. camera automatic focusing method according to claim 1, it is characterised in that：Temperature compensation unit is counted according to focusing Calculate focusing uncompensation distance process be：Temperature compensation unit setting focal length compensation table { (f [i], e [i])：I=1,2 ..., n }, give Focus and meet f [i]≤f ＜ f [i+1] away from f, the corresponding uncompensation distance of focal length is tried to achieve using interpolation method.
- 4. the camera automatic focusing method according to claim 1 or 3, it is characterised in that：Temperature compensation unit is according to poly- Jiao calculate focusing uncompensation distance process be：Temperature compensation unit setting focal length compensation table { (f [i], e [i])：i=1,2,…, N }, given focal length f meets f [i]≤f ＜ f [i+1], and the corresponding uncompensation distance e of focal length f=(e [i are tried to achieve using linear interpolation method +1]-e[i])/(f[i+1]-f[i])*(f-f[i])。
- 5. camera automatic focusing method according to claim 1, it is characterised in that：Scene modeling unit is according to gridding method Total-grid intersection point is selected as datum mark.
- 6. camera automatic focusing method according to claim 1, it is characterised in that：Scene modeling data cell is based on depositing Azimuth needed for the modeling data collection and monitoring objective of storage, using bilinear interpolation algorithm calculate object away from.
- A kind of 7. camera automatic focusing device, it is characterised in that：Mended including lens zoom unit, lens focusing unit, temperature Repay unit, cradle head control unit, automatic focus control unit, scene modeling unit, policer operation unit and scene modeling data Unit, scene modeling unit respectively with lens zoom unit, lens focusing unit, cradle head control unit, auto focus control list Member communication connection, for sending focusing specific length and the cloud that scene modeling needs to lens zoom unit, cradle head control unit Platform azimuth, temperature compensation unit are connected with lens focusing unit and lens zoom unit communication respectively, temperature compensation unit root Focusing uncompensation distance is calculated according to focal length, automatic focus control unit calculates object distance according to focal length and image distance and object distance is fed back to field Scape modeling unit, scene modeling unit are connected with scene modeling data unit communication, for holder azimuth and object distance to be formed Modeling data collection be stored in scene modeling data cell；Scene modeling data cell and policer operation unit can receive the external world Focal length and holder azimuth needed for the monitoring objective of input, scene modeling data cell building from storage according to holder azimuth According to concentrating selection and the matched object distance in holder azimuth and being transmitted to policer operation unit, policer operation unit becomes modulus with camera lens Burnt unit, lens focusing unit, the connection of cradle head control unit communication, for by the focal length needed for monitoring objective, object distance and holder Azimuth is transmitted to lens zoom unit, lens focusing unit and cradle head control unit, and camera lens border unit is by lens focus tune To focusing needed for monitoring objective, lens focusing unit calculates image distance according to object distance, focal length, and temperature compensation unit is according to focometer Focusing uncompensation distance is calculated, holder is adjusted to azimuth needed for monitoring objective by cradle head control unit, is focused so as to complete target Journey.
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Cited By (5)
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