CN111158107B - Focusing method, device and equipment of lens module - Google Patents
Focusing method, device and equipment of lens module Download PDFInfo
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- CN111158107B CN111158107B CN202010005978.2A CN202010005978A CN111158107B CN 111158107 B CN111158107 B CN 111158107B CN 202010005978 A CN202010005978 A CN 202010005978A CN 111158107 B CN111158107 B CN 111158107B
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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
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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
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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
- 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
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
Abstract
The embodiment of the specification discloses a focusing method, a focusing device and focusing equipment of a lens module. The scheme comprises the following steps: acquiring an angle between a lens module and a horizontal plane, and acquiring a distance between the lens module and an object to be shot; and under the determined angle and distance, determining a corresponding driving current value based on the pre-stored relation data of the recording distance and the driving current value, and driving the voice coil camera of the lens module by adopting the current of the driving current value so as to realize focusing.
Description
Technical Field
The present disclosure relates to the field of automatic control technologies, and in particular, to a method, an apparatus, and a device for focusing a lens module.
Background
In the prior art, a Voice Coil Motor (VCM) is generally provided in a lens module having a camera function in a device such as a smart phone. The voice coil motor has the function of driving the lens to move in the lens module, so that the image distance and the corresponding object distance are adjusted, and the lens module can shoot clear images.
The focusing principle of the lens module with the voice coil motor is that in a permanent magnetic field, the stretching position of the spring piece is controlled by changing the direct current of the coil in the motor, so that the lens on the spring piece is driven to move. Based on the principle, the lens module with the voice coil motor can achieve high focusing precision.
On the other hand, some technologies in the prior art have higher requirements on the definition of an image, so that the focusing accuracy of the existing lens module with the voice coil motor cannot meet the standard quickly. In the prior art, for a focusing method of a lens module with a voice coil motor, it is generally necessary to repeatedly adjust an image distance of the lens module based on a captured image resolution until a relatively clear image is obtained, so that focusing can be completed, and efficiency is low.
Therefore, how to further improve the focusing efficiency of the lens module with the voice coil motor is a technical problem to be solved.
Disclosure of Invention
In view of this, embodiments of the present disclosure provide a method, an apparatus, and a device for focusing a lens module, which are used to improve the focusing efficiency of the lens module with a voice coil motor.
In order to solve the above technical problem, the embodiments of the present specification are implemented as follows:
an embodiment of the present disclosure provides a focusing method for a lens module, including:
acquiring first angle information; the first angle information represents a first included angle between the orientation of the lens module and the horizontal plane;
acquiring first distance information; the first distance information represents a first distance between the lens module and a target object to be shot;
determining a driving current value corresponding to the first distance under the first included angle based on existing relation data of the recorded distance and the driving current value;
and driving the voice coil motor of the lens module by adopting the current of the driving current value.
An embodiment of the present specification provides a focusing apparatus for a lens module, including:
the angle information acquisition module is used for acquiring first angle information; the first angle information represents a first included angle between the orientation of the lens module and the horizontal plane;
the distance information acquisition module is used for acquiring first distance information; the first distance information represents a first distance between the lens module and a target object to be shot;
the driving current value determining module is used for determining a driving current value corresponding to the first distance under the first included angle based on existing relation data of the recorded distance and the driving current value;
and the driving module is used for driving the voice coil motor of the lens module by adopting the current of the driving current value.
An electronic device provided in an embodiment of the present specification for focusing a lens module includes:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to:
acquiring first angle information; the first angle information represents a first included angle between the orientation of the lens module and the horizontal plane;
acquiring first distance information; the first distance information represents a first distance between the lens module and a target object to be shot;
determining a driving current value corresponding to the first distance under the first included angle based on existing relation data of the recorded distance and the driving current value;
and driving the voice coil motor of the lens module by adopting the current of the driving current value.
The embodiment of the specification adopts at least one technical scheme which can achieve the following beneficial effects:
obtaining first angle information; the first angle information represents a first included angle between the orientation of the lens module and the horizontal plane; acquiring first distance information; the first distance information represents a first distance between the lens module and a target object to be shot; determining a driving current value corresponding to the first distance under the first included angle based on existing relation data of the recorded distance and the driving current value; the current of the driving current value can be directly adopted to drive the voice coil motor of the lens module to finish focusing, so that the image distance does not need to be repeatedly adjusted according to the definition of an image, and the focusing efficiency of the lens module with the voice coil motor is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic structural diagram of a lens module with a voice coil motor according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart illustrating a focusing method of a lens module according to an embodiment of the present disclosure;
fig. 3 is a schematic flowchart illustrating a calibration method for a lens module according to an embodiment of the present disclosure;
fig. 4 is a schematic flowchart illustrating a focusing method of a lens module according to another embodiment of the present disclosure;
fig. 5 is a schematic flowchart illustrating another focusing method for a lens module according to an embodiment of the present disclosure;
fig. 6 is a schematic flowchart illustrating another focusing method for a lens module according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a focusing device corresponding to the lens module shown in fig. 2 according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of an electronic device for focusing a lens module, which corresponds to fig. 2 and is provided in an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a lens module with a voice coil motor in an embodiment of the present disclosure. As shown in fig. 1, includes: a housing 101 for forming an air-gap magnetic field, a coil winding 102, a mirror 103 and an elastic member 104. When the coil winding 102 is energized with a current, the coil winding 102 itself generates a magnetic field, which is not referred to as a first magnetic field. The housing 101 for forming the air-gap magnetic field may be made of a permanent magnet, and the formed magnetic field is the second magnetic field. The interaction between the first magnetic field and the second magnetic field may generate a force for driving the coil winding 102 to move in the axial direction. One end of the coil winding 102 is connected to the elastic member 104, and the other end is provided with a load such as a mirror 103. By adjusting the current value of the current flowing through the coil winding 102, the coil winding 102 can be controlled to drive the lens 103 to move to a specified position. After moving to the designated position, the coil winding 102 can reach an equilibrium state under the action of the magnetic force and the elastic force of the elastic member 104. The above is a brief description of the structure and principle of the lens module of the voice coil motor, and the actual structure of the lens module includes other parts, which are not all shown here.
The inventor has found that, in actual use, the load weight of the structure such as the mirror 103 carried by the coil winding 102 generates a pressure on the elastic member 104 under the action of gravity. Moreover, the lens module can shoot at various angles. When the included angle between the lens module and the horizontal plane is different, the pressure value of the pressure can be changed. The variation of the pressure value causes the object distance focused by the lens to vary under the condition that the current value of the driving current is not changed. This variation, in terms of object distance, can range from a few centimeters or more; the distance that varies from an image distance point of view is in the range of a few microns to hundreds of microns.
Although this variation value is small, since the requirement for the focusing accuracy is extremely high in the technology such as iris recognition, the focusing accuracy cannot meet the standard even with the small variation value.
However, in order to solve the above problems, a method generally adopted by those skilled in the art is to repeatedly adjust the image distance of the lens module based on the sharpness of the acquired image until a relatively sharp image is acquired, and then to complete focusing, so that the focusing efficiency is low.
The low focusing efficiency is a serious problem in some application scenarios. For example, in a scenario where iris recognition is used for payment, if the focusing efficiency is low, the payment time of a single user is long, and if the user waiting for payment is a plurality of users waiting in line, the time delay is accumulated for the users at the end of the team. Therefore, the method has great significance for improving the focusing efficiency under the high-precision recognition scene.
In view of this, one or more embodiments of the present disclosure provide a focusing method for a lens module, so as to improve the focusing efficiency of the lens module.
Fig. 2 is a flowchart illustrating a focusing method of a lens module according to an embodiment of the present disclosure. From the viewpoint of the program, the main body of execution of the flow may be the program installed in the server or the terminal. The terminal can comprise a smart phone with a camera, a tablet computer or a notebook computer and other devices.
As shown in fig. 2, the process may include the following steps:
step 202: acquiring first angle information; the first angle information represents a first included angle between the orientation of a lens module where the voice coil motor is located and a horizontal plane;
in practical application, the angle measuring device can communicate with an angle measuring device on equipment where the lens module is located, and angle information detected by the angle measuring device is acquired as first angle information.
Step 204: acquiring first distance information; the first distance information represents a first distance between the lens module and a target object to be shot;
in practical application, the distance measuring device can communicate with a distance measuring device on a device where the lens module is located, and distance information detected by the distance measuring device is acquired as first distance information.
Step 206: determining a driving current value corresponding to the first distance under the first included angle based on existing relation data of the recorded distance and the driving current value;
the recorded distance-to-drive current value relation data may be a plurality of sets of calibration data obtained by performing calibration in advance, or may be a focus mapping function representing a mapping relation between the distance and the drive current value. Multiple sets of calibration data may be stored in the focus table. The driving current value corresponding to the first distance under the first included angle can be determined in a table look-up mode or a function calculation mode.
Step 208: and driving the voice coil motor of the lens module by adopting the current of the driving current value.
Since the driving current value is obtained according to data for calibrating the lens module in advance, and is a calibrated current value determined based on the fact that the image definition meets the actual requirement in the calibration process, the current of the driving current value determined in the step 206 is directly adopted to drive the voice coil motor of the lens module, and high-precision focusing can be realized.
The method of fig. 2, acquiring first angle information; the first angle information represents a first included angle between the orientation of the lens module and the horizontal plane; acquiring first distance information; the first distance information represents a first distance between the lens module and a target object to be shot; determining a driving current value corresponding to the first distance under the first included angle based on existing relation data of the recorded distance and the driving current value; the current of the driving current value can be directly adopted to drive the voice coil motor of the lens module to finish focusing, so that the image distance does not need to be repeatedly adjusted according to the definition of an image, and the focusing efficiency of the lens module with the voice coil motor is improved.
In practical applications, the angle measuring device may specifically adopt: an accelerometer, and/or a gyroscope.
The distance measuring device may specifically employ:
a structured light ranging module, a Time Of Flight (ToF) ranging module, a laser ranging module, or a sonar ranging module.
In practical applications, step 206 may specifically include the following steps:
determining a focusing table corresponding to the first included angle; the focusing table comprises a plurality of value pairs, and the value pairs at least comprise a distance value and a driving current value corresponding to the distance value;
and determining a driving current value corresponding to the first distance according to a focusing table corresponding to the first included angle.
A focus table may correspond to a particular angle. The focusing table stores driving current values corresponding to a plurality of distances between the lens module and a target object to be shot under the specific angle.
The focusing table may be obtained by calibrating the lens module in advance. The specific calibration process may be as shown in fig. 3.
Fig. 3 is a schematic flowchart of a calibration method for a lens module according to an embodiment of the present disclosure. As shown in fig. 3, the calibration method may include the steps of:
step 302: acquiring second angle information; the second angle information represents a second included angle between the orientation of the lens module where the voice coil motor is located and the horizontal plane;
the included angle between the lens module and the horizontal plane can be adjusted to be a second included angle. And then calibrating the driving current of the lens module when shooting images with different object distances under the second included angle.
In practical application, the method can be used for communicating with components such as an angle sensor and the like on equipment for calibrating the lens module, and acquiring angle information detected by the components such as the angle sensor and the like as second angle information; and reading data in a preset data table for calibrating the lens module, wherein the data comprises angle information required to calibrate the lens module. The data table may contain data of each angle at which the lens module needs to be calibrated, and distance data of each distance at which the lens module needs to be calibrated at each angle. Similarly, in step 304, at least two methods may be included as the method for acquiring distance information, one being to acquire distance information detected by a distance sensor or the like as second distance information; and the other is to read data in a preset data table for calibrating the lens module, wherein the data comprises distance information required to calibrate the lens module.
It should be noted that, when a preset data table for calibrating the lens module is read, the included angle between the lens orientation of the lens module and the horizontal plane may be controlled according to the read angle data, and the distance between the lens module and the target image may be controlled according to the read distance data.
Step 304: acquiring second distance information; the second distance information represents a second distance between the lens module where the voice coil motor is located and a target image for calibration;
the target image can be an image presented by a calibration card with a pattern, and can also be an image displayed by an electronic device with a screen through the screen.
Under the condition that the included angle between the lens module and the horizontal plane is kept unchanged as a second included angle, the distance between the lens module and the target image for calibration can be adjusted to be the second distance.
Step 306: controlling the lens module to shoot the target image by a plurality of driving current values to obtain a plurality of second calibration images; at least shooting to obtain a second calibration image under one driving current value;
under the condition that the angle and the distance are well determined, the target image can be shot by adopting the driving current within the range of the working current value allowed by the lens module. Since the magnitude of the driving current value causes a change in the focused object distance, one driving current value corresponds to one object distance.
Step 308: determining a second calibration image with highest definition from the plurality of second calibration images;
since one driving current value corresponds to one object distance and the object distances corresponding to different driving current values are different, the definition of the second calibration image corresponding to each driving current value is also different.
The sharpness of the image can be generally detected by using a Brenner gradient function, a Laplacian gradient function, a variance function or the like. And will not be described in detail herein.
Step 310: and recording the driving current value corresponding to the second calibration image with the highest definition as the calibration driving current value corresponding to the second distance under the second included angle.
After the calibrated driving current value is recorded, the lens module can be directly driven by the calibrated driving current value to shoot images according to the actual included angle and distance during subsequent actual shooting, so that the actual object distance determining process is not required to be executed.
With the steps in fig. 3, at least one value pair can be obtained, where the value pair includes a distance value and a driving current value corresponding to the distance value. Based on the method of fig. 3, the aforementioned focusing table, or focusing mapping function, can be obtained. In practical application, the terminal can directly calculate and obtain a corresponding driving current value according to the first distance obtained by current measurement based on a focusing mapping function; or based on the focusing table, the driving current value corresponding to the first distance is obtained through query; and performing function fitting based on the focusing table, calculating to obtain a focusing mapping function, and calculating to obtain a driving current value corresponding to the first distance according to the focusing mapping function obtained by self calculation.
Fig. 4 is a flowchart illustrating another focusing method for a lens module according to an embodiment of the present disclosure. As shown in fig. 4, the method may include the steps of:
step 402: acquiring first angle information; the first angle information represents a first included angle between the orientation of the lens module and the horizontal plane;
step 404: acquiring first distance information; the first distance information represents a first distance between the lens module and a target object to be shot;
step 406: acquiring calibration angles corresponding to a plurality of pre-stored focusing tables to obtain a plurality of calibration angles;
in the pre-calibration process, a focusing table can be obtained under a determined calibration angle. A terminal or the like may store a plurality of focusing tables in advance. One focusing table corresponds to one calibration angle.
Step 408: determining a first target calibration angle with the smallest difference value with the first included angle from the plurality of calibration angles;
assuming that the plurality of calibration angles are 0 °, 30 °, 60 °, 90 ° and the measured angle is 25 °, the first target calibration angle may be determined to be 30 ° according to step 408.
Step 410: determining the focusing table corresponding to the first target calibration angle as the focusing table corresponding to the first included angle;
step 412: and determining a driving current value corresponding to the first distance according to a focusing table corresponding to the first included angle.
After determining the focusing table corresponding to the first included angle, a first manner of determining the driving current value may be: and directly inquiring the driving current value corresponding to the first distance in the focusing table.
The method specifically comprises the following steps:
obtaining distance values of a plurality of value pairs in a focusing table corresponding to the first included angle to obtain a plurality of distance values;
determining a target calibration distance with the minimum difference value with the first distance from the plurality of distance values;
inquiring a target driving current value corresponding to the target calibration distance from a focusing table corresponding to the first included angle;
and determining a driving current value corresponding to the first distance based on the target driving current value.
In the above steps, assuming that the plurality of distance values are 50cm, 55cm, 60cm and 65cm respectively, and the actual measurement distance is 58cm, it may be determined that the target calibration distance is 60 cm. And directly inquiring the driving current value corresponding to 60cm in the focusing table, and taking the inquired result as the driving current value corresponding to the first distance.
If the focusing precision needs to be further improved, two target calibration distances adjacent to the first distance can be determined from the plurality of distance values; and calculating to obtain a driving current value corresponding to the first distance by an interpolation algorithm based on the driving current values corresponding to the two target calibration distances.
If the focusing precision needs to be further improved, a first focusing mapping function corresponding to the first included angle can be determined according to a focusing table corresponding to the first included angle; the first focus mapping function is used for representing the mapping relation between the distance and the driving current value, the input of the first focus mapping function is the distance value, and the output of the first focus mapping function is the driving current value; and determining a driving current value corresponding to the first distance according to the focusing mapping function.
The method of fig. 4 provides a method of determining a drive current value based on a focus table lookup.
Fig. 5 is a flowchart illustrating another focusing method for a lens module according to an embodiment of the present disclosure. As shown in fig. 5, the method may include the steps of:
step 502: acquiring first angle information; the first angle information represents a first included angle between the orientation of the lens module and the horizontal plane;
step 504: acquiring first distance information; the first distance information represents a first distance between the lens module and a target object to be shot;
step 506: acquiring calibration angles corresponding to a plurality of pre-stored focusing tables to obtain a plurality of calibration angles;
step 508: determining two target calibration angles adjacent to the first included angle from the plurality of calibration angles;
assuming that the plurality of calibration angles are 0 °, 30 °, 60 °, 90 ° and the measured angle is 40 °, it can be determined according to step 508 that the two target calibration angles are 30 ° and 60 °, respectively.
Step 510: and calculating to obtain a focusing table corresponding to the first included angle through an interpolation algorithm based on the focusing tables corresponding to the two target calibration angles.
The principle of the interpolation algorithm is to establish an equation according to the proportional relationship, and then solve the equation to calculate the required data.
The calculation method is exemplified as follows: assuming that the data corresponding to a1 is B1 and the data corresponding to a2 is B2, now that the data corresponding to a is known to be B, with a between a1 and a2, the value of a can be calculated as (a1-a)/(a1-a2) ═ B1-B)/(B1-B2), where a1, a2, B1, B2, B are all known data.
Step 512: and determining a driving current value corresponding to the first distance according to a focusing table corresponding to the first included angle.
The specific implementation manner of step 512 may refer to the content of step 412, and is not described herein again.
The method of fig. 5 provides a method of performing interpolation calculation based on two focusing tables, constructing a new focusing table, and performing lookup according to the new focusing table to determine the driving current value.
Fig. 6 is a flowchart illustrating another focusing method for a lens module according to an embodiment of the present disclosure. As shown in fig. 6, the method may include the steps of:
step 602: acquiring first angle information; the first angle information represents a first included angle between the orientation of the lens module and the horizontal plane;
step 604: acquiring first distance information; the first distance information represents a first distance between the lens module and a target object to be shot;
step 606: obtaining calibration angles corresponding to a plurality of pre-stored focusing mapping functions to obtain a plurality of calibration angles;
in this embodiment, the focusing mapping function corresponding to each calibration angle is obtained in the previous calibration process.
Step 608: determining a second target calibration angle with the smallest difference value with the first included angle from the plurality of calibration angles;
step 610: determining a focusing mapping function corresponding to the second target calibration angle as a focusing mapping function corresponding to the first included angle;
step 612: and determining a driving current value corresponding to the first distance according to the focusing mapping function.
The first distance can be directly used as an input and substituted into the focusing mapping function, and the result output by the focusing mapping function is determined as the driving current value corresponding to the first distance.
The method of fig. 6 provides a method of determining a driving current value by determining a focusing mapping function corresponding to an actually measured included angle based on a focusing mapping function obtained in a pre-calibration process and substituting an actually measured distance into the focusing mapping function.
Based on the same idea, the embodiment of the present specification further provides a device corresponding to the above method. Fig. 7 is a schematic structural diagram of a focusing device corresponding to the lens module shown in fig. 2 according to an embodiment of the present disclosure. As shown in fig. 7, the apparatus may include:
an angle information obtaining module 702, configured to obtain first angle information; the first angle information represents a first included angle between the orientation of the lens module and the horizontal plane;
a distance information obtaining module 704, configured to obtain first distance information; the first distance information represents a first distance between the lens module and a target object to be shot;
a driving current value determining module 706, configured to determine, based on existing relation data between a recorded distance and a driving current value, a driving current value corresponding to the first distance at the first included angle;
and the driving module 708 is configured to drive the voice coil motor of the lens module by using the current of the driving current value.
By adopting the device of fig. 7, the current of the driving current value can be directly adopted to drive the voice coil motor of the lens module to complete focusing, so that the image distance does not need to be repeatedly adjusted according to the definition of an image, and the focusing efficiency of the lens module with the voice coil motor is improved.
In practical applications, the angle information obtaining module 702 may specifically include:
the first sensing parameter acquisition unit is used for acquiring a first sensing parameter of an angle measurement device on equipment where the lens module is located;
and the first angle information obtaining unit is used for obtaining the first angle information according to the first induction parameter.
In practical applications, the angle measuring device may specifically include: an accelerometer, and/or a gyroscope.
In practical applications, the distance information obtaining module 704 may specifically include:
the second sensing parameter acquisition unit is used for acquiring a second sensing parameter of the distance measuring device on the equipment where the lens module is located;
and the first distance information obtaining unit is used for obtaining the first distance information according to the second induction parameter.
In practical applications, the distance measuring device may specifically include:
structured light ranging module, TOF range finding module, laser rangefinder module or sonar range finding module.
In practical applications, the driving current value determining module 706 may specifically include:
a focusing table determining unit, configured to determine a focusing table corresponding to the first included angle; the focusing table comprises a plurality of value pairs, and the value pairs at least comprise a distance value and a driving current value corresponding to the distance value;
and the driving current value determining unit is used for determining the driving current value corresponding to the first distance according to the focusing table corresponding to the first included angle.
In practical applications, the focusing table determining unit may specifically include:
the first calibration angle acquisition subunit is used for acquiring calibration angles corresponding to a plurality of pre-stored focusing tables to obtain a plurality of calibration angles;
the first target calibration angle determining subunit is used for determining a first target calibration angle with the smallest difference value with the first included angle from the plurality of calibration angles;
and the first focusing table determining subunit is configured to determine the focusing table corresponding to the first target calibration angle as the focusing table corresponding to the first included angle.
In practical applications, the focusing table determining unit may specifically include:
the second calibration angle acquisition subunit is used for acquiring calibration angles corresponding to a plurality of pre-stored focusing tables to obtain a plurality of calibration angles;
the second target calibration angle determining subunit is configured to determine two target calibration angles adjacent to the first included angle from the plurality of calibration angles;
and the second focusing table determining subunit is used for calculating to obtain the focusing table corresponding to the first included angle through an interpolation algorithm based on the focusing tables corresponding to the two target calibration angles.
In practical applications, the driving current value determining unit may specifically include:
a distance value obtaining subunit, configured to obtain distance values of a plurality of value pairs in the focusing table corresponding to the first included angle, so as to obtain a plurality of distance values;
a target calibration distance determining subunit, configured to determine, from the plurality of distance values, a target calibration distance having a smallest difference from the first distance;
the target driving current value query subunit is configured to query a target driving current value corresponding to the target calibration distance from the focusing table corresponding to the first included angle;
and the first driving current value determining subunit is configured to determine, based on the target driving current value, a driving current value corresponding to the first distance.
In practical applications, the driving current value unit may specifically include:
a first focus mapping function determining subunit, configured to determine, according to the focus table corresponding to the first included angle, a first focus mapping function corresponding to the first included angle; the first focus mapping function is used for representing the mapping relation between the distance and the driving current value, the input of the first focus mapping function is the distance value, and the output of the first focus mapping function is the driving current value;
and the second driving current value determining subunit is used for determining the driving current value corresponding to the first distance according to the first focus mapping function.
In practical applications, the driving current value determining module 706 may specifically include:
a second focus mapping function determining unit, configured to determine a second focus mapping function corresponding to the first included angle; the second focus mapping function is used for representing a mapping relation between a distance and a driving current value, the input of the second focus mapping function is a distance value, and the output of the second focus mapping function is a driving current value;
and the driving current value determining unit is used for determining a driving current value corresponding to the first distance according to the second focus mapping function.
In practical applications, the second focus mapping function determining unit may specifically include:
the third calibration angle acquisition subunit is used for acquiring calibration angles corresponding to a plurality of pre-stored focusing mapping functions to obtain a plurality of calibration angles;
a third target calibration angle determining subunit, configured to determine, from the multiple calibration angles, a second target calibration angle with a smallest difference from the first included angle;
and the second focusing mapping function determining subunit is configured to determine a second focusing mapping function corresponding to the first included angle from the focusing mapping function corresponding to the second target calibration angle.
Based on the same idea, the embodiment of the present specification further provides an electronic device corresponding to the method.
Fig. 8 is a schematic structural diagram of an electronic device for focusing a lens module, which corresponds to fig. 2 and is provided in an embodiment of the present disclosure. The electronic device may include a smart phone with a camera, a tablet computer, a notebook computer, or the like.
As shown in fig. 8, the electronic device 800 may include:
at least one processor 810; and the number of the first and second groups,
a memory 830 communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory 830 stores instructions 820 executable by the at least one processor 810 to enable the at least one processor 810 to:
acquiring first angle information; the first angle information represents a first included angle between the orientation of the lens module and the horizontal plane;
acquiring first distance information; the first distance information represents a first distance between the lens module and a target object to be shot;
determining a driving current value corresponding to the first distance under the first included angle based on existing relation data of the recorded distance and the driving current value;
and driving the voice coil motor of the lens module by adopting the current of the driving current value.
By adopting the electronic equipment shown in fig. 8, the current of the driving current value can be directly adopted to drive the voice coil motor of the lens module to complete focusing, so that the image distance does not need to be repeatedly adjusted according to the definition of an image, and the focusing efficiency of the lens module with the voice coil motor is improved.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
In the 90 s of the 20 th century, improvements in a technology could clearly distinguish between improvements in hardware (e.g., improvements in circuit structures such as diodes, transistors, switches, etc.) and improvements in software (improvements in process flow). However, as technology advances, many of today's process flow improvements have been seen as direct improvements in hardware circuit architecture. Designers almost always obtain the corresponding hardware circuit structure by programming an improved method flow into the hardware circuit. Thus, it cannot be said that an improvement in the process flow cannot be realized by hardware physical modules. For example, a Programmable Logic Device (PLD), such as a Field Programmable Gate Array (FPGA), is an integrated circuit whose Logic functions are determined by programming the Device by a user. A digital system is "integrated" on a PLD by the designer's own programming without requiring the chip manufacturer to design and fabricate application-specific integrated circuit chips. Furthermore, nowadays, instead of manually making an Integrated Circuit chip, such Programming is often implemented by "logic compiler" software, which is similar to a software compiler used in program development and writing, but the original code before compiling is also written by a specific Programming Language, which is called Hardware Description Language (HDL), and HDL is not only one but many, such as abel (advanced Boolean Expression Language), ahdl (alternate Hardware Description Language), traffic, pl (core universal Programming Language), HDCal (jhdware Description Language), lang, Lola, HDL, laspam, hardward Description Language (vhr Description Language), vhal (Hardware Description Language), and vhigh-Language, which are currently used in most common. It will also be apparent to those skilled in the art that hardware circuitry that implements the logical method flows can be readily obtained by merely slightly programming the method flows into an integrated circuit using the hardware description languages described above.
The controller may be implemented in any suitable manner, for example, the controller may take the form of, for example, a microprocessor or processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) executable by the (micro) processor, logic gates, switches, an Application Specific Integrated Circuit (ASIC), a programmable logic controller, and an embedded microcontroller, examples of which include, but are not limited to, the following microcontrollers: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20, and Silicone Labs C8051F320, the memory controller may also be implemented as part of the control logic for the memory. Those skilled in the art will also appreciate that, in addition to implementing the controller as pure computer readable program code, the same functionality can be implemented by logically programming method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Such a controller may thus be considered a hardware component, and the means included therein for performing the various functions may also be considered as a structure within the hardware component. Or even means for performing the functions may be regarded as being both a software module for performing the method and a structure within a hardware component.
The systems, devices, modules or units illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. One typical implementation device is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functionality of the units may be implemented in one or more software and/or hardware when implementing the present application.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium which can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (25)
1. A focusing method of a lens module comprises the following steps:
acquiring first angle information; the first angle information represents a first included angle between the orientation of the lens module and the horizontal plane;
acquiring first distance information; the first distance information represents a first distance between the lens module and a target object to be shot;
determining a driving current value corresponding to the first distance under the first included angle based on existing relation data of the recorded distance and the driving current value; the relation data is a plurality of groups of calibration data obtained by calibration in advance, or a focusing mapping function used for representing the mapping relation between the distance and the driving current value; the multiple groups of calibration data are stored in focusing tables, one focusing table corresponds to a specific angle, and driving current values corresponding to multiple distances between the lens module and the target object to be shot at the specific angle are stored in each focusing table;
and driving the voice coil motor of the lens module by adopting the current of the driving current value.
2. The method according to claim 1, wherein the acquiring the first angle information specifically includes:
acquiring a first induction parameter of an angle measuring device on equipment where the lens module is located;
and obtaining the first angle information according to the first induction parameter.
3. The method according to claim 2, wherein the angle measuring device comprises: an accelerometer, and/or a gyroscope.
4. The method of claim 1, wherein the obtaining the first distance information specifically comprises:
acquiring a second induction parameter of a distance measuring device on the equipment where the lens module is located;
and obtaining the first distance information according to the second induction parameter.
5. The method of claim 4, wherein the ranging device specifically comprises:
structured light ranging module, TOF range finding module, laser rangefinder module or sonar range finding module.
6. The method according to claim 1, wherein the determining the driving current value corresponding to the first distance at the first included angle specifically includes:
determining a focusing table corresponding to the first included angle; the focusing table comprises a plurality of value pairs, and the value pairs at least comprise a distance value and a driving current value corresponding to the distance value;
and determining a driving current value corresponding to the first distance according to a focusing table corresponding to the first included angle.
7. The method according to claim 6, wherein the determining the focusing table corresponding to the first included angle specifically includes:
acquiring calibration angles corresponding to a plurality of pre-stored focusing tables to obtain a plurality of calibration angles;
determining a first target calibration angle with the smallest difference value with the first included angle from the plurality of calibration angles;
and determining the focusing table corresponding to the first target calibration angle as the focusing table corresponding to the first included angle.
8. The method according to claim 6, wherein the determining the focusing table corresponding to the first included angle specifically includes:
acquiring calibration angles corresponding to a plurality of pre-stored focusing tables to obtain a plurality of calibration angles;
determining two target calibration angles adjacent to the first included angle from the plurality of calibration angles;
and calculating to obtain a focusing table corresponding to the first included angle through an interpolation algorithm based on the focusing tables corresponding to the two target calibration angles.
9. The method according to claim 6, wherein determining the driving current value corresponding to the first distance according to the focusing table corresponding to the first included angle specifically comprises:
obtaining distance values of a plurality of value pairs in a focusing table corresponding to the first included angle to obtain a plurality of distance values;
determining a target calibration distance with the minimum difference value with the first distance from the plurality of distance values;
inquiring a target driving current value corresponding to the target calibration distance from a focusing table corresponding to the first included angle;
and determining a driving current value corresponding to the first distance based on the target driving current value.
10. The method according to claim 6 or 8, wherein determining the driving current value corresponding to the first distance according to the focusing table corresponding to the first included angle specifically comprises:
determining a first focus mapping function corresponding to the first included angle according to a focus table corresponding to the first included angle; the first focus mapping function is used for representing the mapping relation between the distance and the driving current value, the input of the first focus mapping function is the distance value, and the output of the first focus mapping function is the driving current value;
and determining a driving current value corresponding to the first distance according to the first focus mapping function.
11. The method according to claim 1, wherein the determining the driving current value corresponding to the first distance at the first included angle specifically includes:
determining a second focus mapping function corresponding to the first included angle; the second focus mapping function is used for representing a mapping relation between a distance and a driving current value, the input of the second focus mapping function is a distance value, and the output of the second focus mapping function is a driving current value;
and determining a driving current value corresponding to the first distance according to the second focus mapping function.
12. The method according to claim 11, wherein the determining the second focus mapping function corresponding to the first included angle specifically includes:
obtaining calibration angles corresponding to a plurality of pre-stored focusing mapping functions to obtain a plurality of calibration angles;
determining a second target calibration angle with the smallest difference value with the first included angle from the plurality of calibration angles;
and determining a focusing mapping function corresponding to the first included angle according to the focusing mapping function corresponding to the second target calibration angle.
13. A focusing device of a lens module comprises:
the angle information acquisition module is used for acquiring first angle information; the first angle information represents a first included angle between the orientation of the lens module and the horizontal plane;
the distance information acquisition module is used for acquiring first distance information; the first distance information represents a first distance between the lens module and a target object to be shot;
the driving current value determining module is used for determining a driving current value corresponding to the first distance under the first included angle based on existing relation data of the recorded distance and the driving current value; the relation data is a plurality of groups of calibration data obtained by calibration in advance, or a focusing mapping function used for representing the mapping relation between the distance and the driving current value; the multiple groups of calibration data are stored in focusing tables, one focusing table corresponds to a specific angle, and driving current values corresponding to multiple distances between the lens module and the target object to be shot at the specific angle are stored in each focusing table;
and the driving module is used for driving the voice coil motor of the lens module by adopting the current of the driving current value.
14. The apparatus according to claim 13, wherein the angle information obtaining module specifically includes:
the first sensing parameter acquisition unit is used for acquiring a first sensing parameter of an angle measurement device on equipment where the lens module is located;
and the first angle information obtaining unit is used for obtaining the first angle information according to the first induction parameter.
15. The device according to claim 14, wherein the angle measuring device comprises: an accelerometer, and/or a gyroscope.
16. The apparatus according to claim 15, wherein the distance information obtaining module specifically includes:
the second sensing parameter acquisition unit is used for acquiring a second sensing parameter of the distance measuring device on the equipment where the lens module is located;
and the first distance information obtaining unit is used for obtaining the first distance information according to the second induction parameter.
17. The device of claim 16, wherein the ranging device comprises:
structured light ranging module, TOF range finding module, laser rangefinder module or sonar range finding module.
18. The apparatus according to claim 13, wherein the driving current value determining module specifically includes:
a focusing table determining unit, configured to determine a focusing table corresponding to the first included angle; the focusing table comprises a plurality of value pairs, and the value pairs at least comprise a distance value and a driving current value corresponding to the distance value;
and the driving current value determining unit is used for determining the driving current value corresponding to the first distance according to the focusing table corresponding to the first included angle.
19. The apparatus according to claim 18, wherein the focus table determining unit specifically includes:
the first calibration angle acquisition subunit is used for acquiring calibration angles corresponding to a plurality of pre-stored focusing tables to obtain a plurality of calibration angles;
the first target calibration angle determining subunit is used for determining a first target calibration angle with the smallest difference value with the first included angle from the plurality of calibration angles;
and the first focusing table determining subunit is configured to determine the focusing table corresponding to the first target calibration angle as the focusing table corresponding to the first included angle.
20. The apparatus according to claim 18, wherein the focus table determining unit specifically includes:
the second calibration angle acquisition subunit is used for acquiring calibration angles corresponding to a plurality of pre-stored focusing tables to obtain a plurality of calibration angles;
the second target calibration angle determining subunit is configured to determine two target calibration angles adjacent to the first included angle from the plurality of calibration angles;
and the second focusing table determining subunit is used for calculating to obtain the focusing table corresponding to the first included angle through an interpolation algorithm based on the focusing tables corresponding to the two target calibration angles.
21. The apparatus according to claim 18, wherein the driving current value determining unit specifically includes:
a distance value obtaining subunit, configured to obtain distance values of a plurality of value pairs in the focusing table corresponding to the first included angle, so as to obtain a plurality of distance values;
a target calibration distance determining subunit, configured to determine, from the plurality of distance values, a target calibration distance having a smallest difference from the first distance;
the target driving current value query subunit is configured to query a target driving current value corresponding to the target calibration distance from the focusing table corresponding to the first included angle;
and the first driving current value determining subunit is configured to determine, based on the target driving current value, a driving current value corresponding to the first distance.
22. The apparatus according to claim 18 or 20, wherein the driving current value unit specifically comprises:
a first focus mapping function determining subunit, configured to determine, according to the focus table corresponding to the first included angle, a first focus mapping function corresponding to the first included angle; the first focus mapping function is used for representing the mapping relation between the distance and the driving current value, the input of the first focus mapping function is the distance value, and the output of the first focus mapping function is the driving current value;
and the second driving current value determining subunit is used for determining the driving current value corresponding to the first distance according to the first focus mapping function.
23. The apparatus according to claim 13, wherein the driving current value determining module specifically includes:
a second focus mapping function determining unit, configured to determine a second focus mapping function corresponding to the first included angle; the second focus mapping function is used for representing a mapping relation between a distance and a driving current value, the input of the second focus mapping function is a distance value, and the output of the second focus mapping function is a driving current value;
and the driving current value determining unit is used for determining a driving current value corresponding to the first distance according to the second focus mapping function.
24. The apparatus according to claim 23, wherein the second focus mapping function determining unit specifically includes:
the third calibration angle acquisition subunit is used for acquiring calibration angles corresponding to a plurality of pre-stored focusing mapping functions to obtain a plurality of calibration angles;
a third target calibration angle determining subunit, configured to determine, from the multiple calibration angles, a second target calibration angle with a smallest difference from the first included angle;
and the second focusing mapping function determining subunit is configured to determine a second focusing mapping function corresponding to the first included angle from the focusing mapping function corresponding to the second target calibration angle.
25. An electronic device for focusing a lens module, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to:
acquiring first angle information; the first angle information represents a first included angle between the orientation of the lens module and the horizontal plane;
acquiring first distance information; the first distance information represents a first distance between the lens module and a target object to be shot;
determining a driving current value corresponding to the first distance under the first included angle based on existing relation data of the recorded distance and the driving current value; the relation data is a plurality of groups of calibration data obtained by calibration in advance, or a focusing mapping function used for representing the mapping relation between the distance and the driving current value; the multiple groups of calibration data are stored in focusing tables, one focusing table corresponds to a specific angle, and driving current values corresponding to multiple distances between the lens module and the target object to be shot at the specific angle are stored in each focusing table;
and driving the voice coil motor of the lens module by adopting the current of the driving current value.
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| CN202110949288.7A CN113589473B (en) | 2020-01-03 | 2020-01-03 | Focusing method, device and equipment of lens module |
| CN202010005978.2A CN111158107B (en) | 2020-01-03 | 2020-01-03 | Focusing method, device and equipment of lens module |
| PCT/CN2020/134767 WO2021135867A1 (en) | 2020-01-03 | 2020-12-09 | Lens module focusing method and apparatus, and device |
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| CN111158107B (en) * | 2020-01-03 | 2021-07-06 | 支付宝(杭州)信息技术有限公司 | Focusing method, device and equipment of lens module |
| CN114157801B (en) * | 2020-09-08 | 2024-02-27 | 北京小米移动软件有限公司 | Switching control method and device of camera module and storage medium |
| CN112651382B (en) * | 2021-01-15 | 2024-04-02 | 北京中科虹霸科技有限公司 | Focusing data calibration system and iris image acquisition system |
| CN113452917B (en) * | 2021-07-06 | 2023-04-25 | 信利光电股份有限公司 | Front-back shared camera automatic focusing method and system |
| CN116095473A (en) * | 2021-11-01 | 2023-05-09 | 中兴终端有限公司 | Lens automatic focusing method, device, electronic equipment and computer storage medium |
| CN114598813A (en) * | 2022-02-13 | 2022-06-07 | 昆山丘钛微电子科技股份有限公司 | Camera module automatic focusing control method and device |
| CN115079369B (en) * | 2022-05-25 | 2023-12-26 | 北京都视科技有限公司 | Optical focusing method and device of lens module, storage medium and lens module |
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| WO2021135867A1 (en) | 2021-07-08 |
| CN113589473A (en) | 2021-11-02 |
| CN113589473B (en) | 2023-09-29 |
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