CN111158107B - A focusing method, device and equipment for a lens module - Google Patents

Abstract

The embodiments of the present specification disclose a focusing method, device and equipment for a lens module. The scheme includes: obtaining the angle between the lens module and the horizontal plane, and obtaining the distance between the lens module and the object to be photographed; under the determined angle and distance, based on pre-stored relationship data between the recording distance and the driving current value, determine The corresponding driving current value is used to drive the voice coil camera of the lens module to achieve focusing.

Description

A focusing method, device and equipment for a lens module

technical field

The present application relates to the technical field of automatic control, and in particular, to a focusing method, device and equipment for a lens module.

Background technique

In the prior art, a voice coil motor (Voice Coil Motor, VCM) is usually provided in a lens module with a camera function in a device such as a smartphone. The function of the voice coil motor in the lens module is to drive the lens to move, so as to adjust the image distance and the corresponding object distance, so that the lens module can capture 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 sheet is controlled by changing the DC current of the coil in the motor, thereby driving the lens on the spring sheet to move. Based on this principle, the lens module with the voice coil motor itself can achieve high focusing accuracy.

However, on the other hand, there are some technologies in the prior art that have higher requirements on the clarity of the image, so that the focusing accuracy of the existing lens module with a voice coil motor cannot quickly meet the standard. In the prior art, for the focusing method of a lens module with a voice coil motor, it is usually necessary to repeatedly adjust the image distance of the lens module based on the acquired image clarity, and the focusing can be completed only after a clearer image is obtained. ,low efficiency.

Therefore, how to further improve the focusing efficiency of the lens module with the voice coil motor has become an urgent technical problem to be solved.

SUMMARY OF THE INVENTION

In view of this, the embodiments of the present specification provide a focusing method, device and equipment for a lens module, which are used to improve the focusing efficiency of a lens module having a voice coil motor.

In order to solve the above-mentioned technical problems, the embodiments of this specification are implemented as follows:

A method for focusing a lens module provided by the embodiments of this specification includes:

obtaining first angle information; the first angle information represents the first angle between the lens orientation of the lens module and the horizontal plane;

obtaining first distance information; the first distance information represents the first distance between the lens module and the target object to be photographed;

determining the drive current value corresponding to the first distance under the first included angle based on the existing relationship data between the recorded distance and the drive current value;

The voice coil motor of the lens module is driven by the current of the driving current value.

A focusing device for a lens module provided by the embodiments of this specification includes:

an angle information acquisition module, used for acquiring first angle information; the first angle information represents the first angle between the lens orientation of the lens module and the horizontal plane;

a distance information acquisition module, configured to acquire first distance information; the first distance information represents the first distance between the lens module and the target object to be photographed;

a drive current value determination module, configured to determine the drive current value corresponding to the first distance under the first included angle based on the existing relationship data between the recorded distance and the drive current value;

The driving module is used for driving the voice coil motor of the lens module with the current of the driving current value.

An electronic device for focusing a lens module provided by the embodiments of this specification includes:

at least one processor; and,

a memory communicatively coupled to the at least one processor; wherein,

The memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to:

obtaining first angle information; the first angle information represents the first angle between the lens orientation of the lens module and the horizontal plane;

obtaining first distance information; the first distance information represents the first distance between the lens module and the target object to be photographed;

determining the drive current value corresponding to the first distance under the first included angle based on the existing relationship data between the recorded distance and the drive current value;

The voice coil motor of the lens module is driven by the current of the driving current value.

The above-mentioned at least one technical solution adopted in the embodiments of this specification can achieve the following beneficial effects:

By acquiring first angle information; the first angle information represents the first angle between the lens orientation of the lens module and the horizontal plane; the first distance information is acquired; the first distance information represents the lens module The first distance from the target object to be photographed; based on the existing relationship data between the recorded distance and the drive current value, determine the drive current value corresponding to the first distance under the first included angle; The current of the driving current value drives the voice coil motor of the lens module to complete focusing, thereby eliminating the need to repeatedly adjust the image distance according to the clarity of the image, thereby improving the focusing efficiency of the lens module with the voice coil motor.

Description of drawings

The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation of the present application. In the attached image:

1 is a schematic structural diagram of a lens module with a voice coil motor in the embodiment of this specification;

FIG. 2 is a schematic flowchart of a focusing method of a lens module provided by an embodiment of the present specification;

3 is a schematic flowchart of a method for calibrating a lens module according to an embodiment of the present specification;

4 is a schematic flowchart of another focusing method of a lens module provided by the embodiment of the present specification;

5 is a schematic flowchart of another focusing method of a lens module provided by the embodiment of the present specification;

6 is a schematic flowchart of another focusing method of a lens module provided by the embodiment of the present specification;

FIG. 7 is a schematic structural diagram of a focusing device corresponding to a lens module of FIG. 2 provided by an embodiment of the present specification;

FIG. 8 is a schematic structural diagram of an electronic device for focusing a lens module corresponding to FIG. 2 according to an embodiment of the present specification.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

The technical solutions provided by the embodiments of the present application will be 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 according to an embodiment of the present specification. As shown in FIG. 1 , it includes: a casing 101 for forming an air gap magnetic field, a coil winding 102 , a lens 103 and an elastic member 104 . After the coil winding 102 is supplied with current, the coil winding 102 will generate a magnetic field, which may be referred to as the first magnetic field. The casing 101 for forming the air gap magnetic field may be made of permanent magnet material, and the formed magnetic field is the second magnetic field. The interaction between the first magnetic field and the second magnetic field can 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 lens 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 a balanced state under the action of the magnetic field 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. The actual structure of the lens module also includes other parts, not all of which are shown here.

The inventors have found through research that, in actual use, the load weight of the lens 103 and other structures carried by the coil winding 102 will generate pressure on the elastic member 104 under the action of gravity. Also, the lens module may be photographed at various angles. When the angle between the lens module and the horizontal plane is different, the pressure value of the above pressure will also change. The change in the pressure value will cause the object distance to be focused by the lens to change when the current value of the driving current remains unchanged. This change, from the perspective of object distance, can range from a few centimeters or more; from the perspective of image distance, the range of the changed distance is from a few microns to hundreds of microns.

Although this change value is small, since technologies such as iris recognition have extremely high requirements for focusing accuracy, the above-mentioned small change value will also cause the focusing accuracy to fail to meet the standard.

When faced with the above problems, those skilled in the art usually adopt a method of repeatedly adjusting the image distance of the lens module based on the acquired image clarity, until a clearer image is obtained, and then the focusing is completed. Therefore, the focusing efficiency is improved. low.

The low focusing efficiency is a serious problem in some application scenarios. For example, in the payment scene using iris recognition, if the focusing efficiency is low, it will lead to a long payment time for a single user. If the user waiting to pay is multiple users waiting in line, the delay in this time will be very important. Users at the end of the team also add up. Therefore, it is of great significance to improve the focusing efficiency for high-precision recognition scenes.

In view of this, one or more embodiments of the present specification provide a focusing method for a lens module, so as to improve the focusing efficiency for the lens module.

FIG. 2 is a schematic flowchart of a focusing method of a lens module according to an embodiment of the present specification. From a program perspective, the execution body of the process may be a program mounted on a server or a terminal. The terminal may include devices such as a smart phone, a tablet computer, or a notebook computer with a camera.

As shown in Figure 2, the process can include the following steps:

Step 202: obtaining first angle information; the first angle information represents the first angle between the lens orientation of the lens module where the voice coil motor is located and the horizontal plane;

In practical applications, it is possible to communicate with the angle measuring device on the equipment where the lens module is located, and obtain the angle information detected by the angle measuring device as the first angle information.

Step 204: obtaining first distance information; the first distance information represents the first distance between the lens module and the target object to be photographed;

In practical applications, it is possible to communicate with the distance measuring device on the device where the lens module is located, and obtain the distance information detected by the distance measuring device as the first distance information.

Step 206: Determine the drive current value corresponding to the first distance under the first included angle based on the existing relationship data between the recorded distance and the drive current value;

The relationship data between the recorded distance and the driving current value may be multiple sets of calibration data obtained by pre-calibration, or may be a focus mapping function used to represent the mapping relationship between the distance and the driving current value. Multiple sets of calibration data can be stored in the focus table. The driving current value corresponding to the first distance under the first included angle may be determined by means of table look-up or function calculation.

Step 208: Drive the voice coil motor of the lens module with the current of the driving current value.

Since the drive current value is obtained according to the pre-calibrated data of the lens module, and the calibration current value is determined based on the image definition meeting the actual demand during the calibration process, the drive current value determined in step 206 is directly used The current that drives the voice coil motor of the lens module can achieve high-precision focusing.

The method in FIG. 2 acquires first angle information; the first angle information represents the first angle between the lens orientation of the lens module and the horizontal plane; the first distance information is acquired; the first distance information represents The first distance between the lens module and the target object to be photographed; based on the existing relationship data between the recorded distance and the drive current value, determine the drive current value corresponding to the first distance under the first angle ; The voice coil motor of the lens module can be directly driven by the current of the driving current value to complete focusing, so that the image distance does not need to be repeatedly adjusted according to the clarity of the image, thereby improving the focusing of the lens module with the voice coil motor. efficiency.

In practical applications, the angle measurement device may specifically adopt: an accelerometer, and/or a gyroscope.

The distance measuring device can specifically adopt:

Structured light ranging module, Time Of Flight (ToF) ranging module, laser ranging module or sonar ranging module.

In practical applications, step 206 may specifically include the following steps:

determining a focus table corresponding to the first included angle; the focus table includes a plurality of value pairs, and the value pairs at least include a distance value and a drive current value corresponding to the one distance value;

The drive current value corresponding to the first distance is determined according to the focus table corresponding to the first included angle.

A focus table can correspond to a specific angle. The focus table stores driving current values corresponding to multiple distances between the lens module and the target object to be photographed under the specific angle.

The focusing table may be obtained by pre-calibrating the lens module. The specific calibration process can be shown in Figure 3.

FIG. 3 is a schematic flowchart of a method for calibrating a lens module according to an embodiment of the present specification. As shown in Figure 3, the calibration method may include the following steps:

Step 302: Obtain second angle information; the second angle information represents the second angle between the lens orientation of the lens module where the voice coil motor is located and the horizontal plane;

The angle between the lens module and the horizontal plane can be adjusted so that the angle of the angle becomes the second angle. Then, for the second included angle, the lens module calibrates the driving current when shooting images with different object distances.

In practical applications, it can communicate with the angle sensor and other components on the equipment used for calibrating the lens module, and obtain the angle information detected by the angle sensor and other components as the second angle information; The data in the data sheet for calibrating the lens module, the data includes the angle information that needs to be calibrated for the lens module. The data table may contain data of each angle that needs to be calibrated for the lens module, and distance data of each distance that needs to be calibrated to the lens module under each angle. Similarly, in step 304, the acquisition method of the distance information can also include at least two methods, one is to obtain the distance information detected by the distance sensor and other components as the second distance information; the other is to read the preset distance information. For the data in the data table for calibrating the lens module, the data includes the distance information that needs to be calibrated for the lens module.

It should be noted that, when using the method of reading the data in the preset data table for calibrating the lens module, the lens orientation of the lens module can also be controlled according to the read angle data. The included angle between the horizontal planes controls the distance between the lens module and the target image according to the read distance data.

Step 304: Obtain second distance information; the second distance information represents the second distance between the lens module where the voice coil motor is located and the target image used for calibration;

The target image can be an image presented by a calibration card with a pattern, or 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 the second included angle, the distance between the lens module and the target image used for calibration can be adjusted so that the distance becomes the second distance.

Step 306 : controlling the lens module to shoot the target image with a plurality of driving current values to obtain a plurality of second calibration images; under one of the driving current values, at least one second calibration image is obtained by shooting ;

When the angle and the distance are determined, the target image can be photographed by using the driving current within the range of the working current value allowed by the lens module. Since the size of the driving current value will cause the change of the focused object distance, one driving current value corresponds to one object distance.

Step 308: From the plurality of second calibration images, determine the second calibration image with the highest definition;

Since one driving current value corresponds to one object distance, and different driving current values correspond to different object distances, the definition of the second calibration image corresponding to each driving current value is also different.

Usually, methods such as Brenner gradient function, Laplacian gradient function or variance function can be used to detect the sharpness of the image. It is not repeated here.

Step 310: Record 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 calibration drive current value is recorded, in subsequent actual shooting, the calibration drive current value can be directly used to drive the lens module for image capture according to the actual angle and distance, so that there is no need to determine the actual object distance. process.

By using the steps in FIG. 3 , at least one value pair can be obtained, and the value pair includes a distance value and a drive current value corresponding to the one distance value. Based on the method of FIG. 3 , the aforementioned focus table, or focus mapping function, can be obtained. In practical applications, the terminal can directly calculate the corresponding driving current value based on the first distance currently measured based on the focus mapping function; it can also query the driving current value corresponding to the first distance based on the focus table; Table, perform function fitting, and then calculate the focus mapping function, and then calculate the drive current value corresponding to the first distance according to the focus mapping function calculated by itself.

FIG. 4 is a schematic flowchart of another focusing method of a lens module according to an embodiment of the present specification. As shown in Figure 4, the method may include the following steps:

Step 402: Obtain first angle information; the first angle information represents the first angle between the lens orientation of the lens module and the horizontal plane;

Step 404: Obtain first distance information; the first distance information represents the first distance between the lens module and the target object to be photographed;

Step 406: Obtain calibration angles corresponding to multiple pre-stored focus tables to obtain multiple calibration angles;

In the pre-calibration process, a focus table can be obtained at a certain calibration angle. Devices such as terminals can store multiple focus tables in advance. A focus table corresponds to a calibration angle.

Step 408: From the plurality of calibration angles, determine a first target calibration angle with the smallest difference from the first included angle;

Assuming that the multiple calibration angles are 0°, 30°, 60°, and 90° respectively, and the measured included angle is 25°, the first target calibration angle may be determined to be 30° according to step 408 .

Step 410: Determine the focus table corresponding to the first target calibration angle as the focus table corresponding to the first included angle;

Step 412: Determine a drive current value corresponding to the first distance according to the focus table corresponding to the first included angle.

After the focus table corresponding to the first included angle is determined, the first way to determine the drive current value may be: directly query the focus table for the drive current value corresponding to the first distance.

Specifically, the following steps can be included:

Obtaining distance values of a plurality of numerical pairs in the focusing table corresponding to the first included angle, to obtain a plurality of distance values;

From the plurality of distance values, determining a target calibration distance with the smallest difference from the first distance;

From the focus table corresponding to the first included angle, query the target drive current value corresponding to the target calibration distance;

Based on the target driving current value, a driving current value corresponding to the first distance is determined.

In the above steps, assuming that the distance values are 50cm, 55cm, 60cm, and 65cm respectively, and the measured distance is 58cm, the target calibration distance can be determined to be 60cm. Directly query the driving current value corresponding to 60 cm in the focusing table, and use the query result as the driving current value corresponding to the first distance.

If it is necessary to further improve the focusing accuracy, two target calibration distances adjacent to the first distance can also be determined from the plurality of distance values; based on the drive current values corresponding to the two target calibration distances, the interpolation algorithm to obtain the drive current value corresponding to the first distance.

If it is necessary to further improve the focusing accuracy, the first focusing mapping function corresponding to the first included angle can also be determined according to the focusing table corresponding to the first included angle; the first focusing mapping function is used to represent the distance and the driving current The input of the first focus mapping function is a distance value, and the output of the first focus mapping function is a driving current value; according to the focus mapping function, the driving current value corresponding to the first distance is determined .

The method of FIG. 4 provides a method for determining the drive current value by querying based on the focus table.

FIG. 5 is a schematic flowchart of another focusing method of a lens module according to an embodiment of the present specification. As shown in Figure 5, the method may include the following steps:

Step 502: Obtain first angle information; the first angle information represents the first angle between the lens orientation of the lens module and the horizontal plane;

Step 504: Obtain first distance information; the first distance information represents the first distance between the lens module and the target object to be photographed;

Step 506: Obtain calibration angles corresponding to multiple pre-stored focus tables to obtain multiple calibration angles;

Step 508: From the plurality of calibration angles, determine two target calibration angles adjacent to the first included angle;

Assuming that the multiple calibration angles are 0°, 30°, 60°, and 90° respectively, and the measured included angle is 40°, the two target calibration angles can be determined to be 30° and 60° respectively according to step 508 .

Step 510: Based on the focus tables corresponding to the two target calibration angles, through an interpolation algorithm, calculate and obtain the focus table corresponding to the first included angle.

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.

An example of the calculation method is as follows: Assuming that the data corresponding to A1 is B1, the data corresponding to A2 is B2, and now it is known that the data corresponding to A is B, and A is between A1 and A2, you can follow (A1-A) /(A1-A2)=(B1-B)/(B1-B2) Calculate the value of A, where A1, A2, B1, B2, and B are all known data.

Step 512: Determine a drive current value corresponding to the first distance according to the focus table corresponding to the first included angle.

For a specific implementation manner of step 512, reference may be made to the content of step 412, which will not be repeated here.

The method of FIG. 5 provides a method of performing interpolation calculation based on two focus tables, constructing a new focus table, and then querying according to the new focus table to determine the driving current value.

FIG. 6 is a schematic flowchart of another focusing method of a lens module according to an embodiment of the present specification. As shown in Figure 6, the method may include the following steps:

Step 602: Obtain first angle information; the first angle information represents the first angle between the lens orientation of the lens module and the horizontal plane;

Step 604: Obtain first distance information; the first distance information represents the first distance between the lens module and the target object to be photographed;

Step 606: Obtain calibration angles corresponding to multiple pre-stored focus mapping functions to obtain multiple calibration angles;

In this embodiment, the focus mapping function corresponding to each calibration angle has been obtained in the pre-calibration process.

Step 608: From the plurality of calibration angles, determine a second target calibration angle with the smallest difference from the first included angle;

Step 610: Determine the focus mapping function corresponding to the second target calibration angle as the focus mapping function corresponding to the first included angle;

Step 612: Determine a drive current value corresponding to the first distance according to the focus mapping function.

The first distance may be directly used as an input and substituted into the focus mapping function, and the output result of the focus mapping function may be determined as the driving current value corresponding to the first distance.

The method of FIG. 6 provides a method of determining the focus mapping function corresponding to the measured angle based on the focus mapping function obtained in the pre-calibration process, and substituting the measured distance into the focus mapping function to determine the drive current value.

Based on the same idea, the embodiments of the present specification also provide a device corresponding to the above method. FIG. 7 is a schematic structural diagram of a focusing device corresponding to a lens module of FIG. 2 according to an embodiment of the present specification. As shown in Figure 7, the apparatus may include:

An angle information acquisition module 702, configured to acquire first angle information; the first angle information represents the first angle between the lens orientation of the lens module and the horizontal plane;

A distance information acquisition module 704, configured to acquire first distance information; the first distance information represents the first distance between the lens module and the target object to be photographed;

a drive current value determination module 706, configured to determine the drive current value corresponding to the first distance under the first included angle based on the existing relationship data between the recorded distance and the drive current value;

The driving module 708 is used for driving the voice coil motor of the lens module with the current of the driving current value.

With the device in FIG. 7 , the voice coil motor of the lens module can be directly driven by the current of the driving current value to complete focusing, so that it is not necessary to repeatedly adjust the image distance according to the clarity of the image, thereby improving the performance of the voice coil motor. The focusing efficiency of the lens module.

In practical applications, the angle information acquisition module 702 may specifically include:

a first sensing parameter obtaining unit, configured to obtain the first sensing parameter of the angle measuring device on the equipment where the lens module is located;

A first angle information obtaining unit, configured to obtain the first angle information according to the first sensing parameter.

In practical applications, the angle measurement device may specifically include: an accelerometer and/or a gyroscope.

In practical applications, the distance information acquisition module 704 may specifically include:

A second sensing parameter obtaining unit, configured to obtain the second sensing parameter of the ranging device on the device where the lens module is located;

A first distance information obtaining unit, configured to obtain the first distance information according to the second sensing parameter.

In practical applications, the distance measuring device may specifically include:

Structured light ranging module, ToF ranging module, laser ranging module or sonar ranging module.

In practical applications, the drive current value determination module 706 may specifically include:

A focus table determination unit, configured to determine a focus table corresponding to the first included angle; the focus table includes a plurality of value pairs, and the value pairs include at least one distance value and a drive corresponding to the one distance value current value;

A drive current value determination unit, configured to determine the drive current value corresponding to the first distance according to the focus table corresponding to the first included angle.

In practical applications, the focusing table determining unit may specifically include:

The first calibration angle obtaining subunit is used for obtaining calibration angles corresponding to a plurality of pre-stored focusing tables to obtain a plurality of calibration angles;

a first target calibration angle determination subunit, configured to determine, from the plurality of calibration angles, a first target calibration angle with the smallest difference from the first included angle;

The first focus table determination subunit is configured to determine the focus table corresponding to the first target calibration angle as the focus table corresponding to the first included angle.

In practical applications, the focusing table determining unit may specifically include:

The second calibration angle obtaining subunit is used to obtain calibration angles corresponding to multiple pre-stored focus tables, and obtain multiple calibration angles;

a second target calibration angle determination subunit, configured to determine two target calibration angles adjacent to the first included angle from the plurality of calibration angles;

The second focus table determination subunit is configured to calculate the focus table corresponding to the first included angle through an interpolation algorithm based on the focus tables corresponding to the two target calibration angles.

In practical applications, the drive current value determination unit may specifically include:

a distance value obtaining subunit, used for obtaining the distance values of a plurality of numerical pairs in the focusing table corresponding to the first included angle, to obtain a plurality of distance values;

a target calibration distance determination subunit, configured to determine, from the plurality of distance values, a target calibration distance with the smallest difference from the first distance;

a target driving current value query subunit, configured to query the target driving current value corresponding to the target calibration distance from the focusing table corresponding to the first included angle;

The first drive current value determination subunit is configured to determine the drive current value corresponding to the first distance based on the target drive current value.

In practical applications, the drive current value unit may specifically include:

The first focus mapping function determination subunit is used to determine the first focus mapping function corresponding to the first included angle according to the focus table corresponding to the first included angle; the first focus mapping function is used to represent the distance and a mapping relationship of driving current values, the input of the first focus mapping function is a distance value, and the output of the first focus mapping function is a driving current value;

The second driving current value determination subunit is configured to determine the driving current value corresponding to the first distance according to the first focus mapping function.

In practical applications, the drive current value determination module 706 may specifically include:

The second focus mapping function determination unit is used to determine the second focus mapping function corresponding to the first included angle; the second focus mapping function is used to represent the mapping relationship between the distance and the driving current value, and the second focus mapping function The input of the function is a distance value, and the output of the second focus mapping function is a drive current value;

A drive current value determination unit, configured to determine a drive current value corresponding to the first distance according to the second focus mapping function.

In practical applications, the second focus mapping function determination unit may specifically include:

The third calibration angle obtaining subunit is used for obtaining calibration angles corresponding to multiple pre-stored focus mapping functions to obtain multiple calibration angles;

a third target calibration angle determination subunit, configured to determine, from the plurality of calibration angles, a second target calibration angle with the smallest difference from the first included angle;

The second focus mapping function determination subunit is configured to determine the second focus mapping function corresponding to the first angle by calibrating the focus mapping function corresponding to the second target angle.

Based on the same idea, the embodiments of the present specification also provide an electronic device corresponding to the above method.

FIG. 8 is a schematic structural diagram of an electronic device for focusing a lens module corresponding to FIG. 2 according to an embodiment of the present specification. The electronic device may include a smartphone, a tablet computer, or a laptop computer with a camera.

As shown in FIG. 8, the electronic device 800 may include:

at least one processor 810; and,

a memory 830 in communication with the at least one processor; wherein,

The memory 830 stores instructions 820 executable by the at least one processor 810, the instructions being executed by the at least one processor 810 to enable the at least one processor 810 to:

obtaining first angle information; the first angle information represents the first angle between the lens orientation of the lens module and the horizontal plane;

obtaining first distance information; the first distance information represents the first distance between the lens module and the target object to be photographed;

determining the drive current value corresponding to the first distance under the first included angle based on the existing relationship data between the recorded distance and the drive current value;

The voice coil motor of the lens module is driven by the current of the driving current value.

Using the electronic device shown in FIG. 8 , it is possible to directly drive the voice coil motor of the lens module to complete focusing by using the current of the driving current value, so that it is not necessary to repeatedly adjust the image distance according to the clarity of the image, thereby improving the performance of the camera. The focusing efficiency of the lens module of the voice coil motor.

The foregoing describes specific embodiments of the present specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that in the embodiments and still achieve desirable results. Additionally, the processes depicted in the figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

In the 1990s, improvements in a technology could be clearly differentiated between improvements in hardware (eg, improvements to circuit structures such as diodes, transistors, switches, etc.) or improvements in software (improvements in method flow). However, with the development of technology, the improvement of many methods and processes today can be regarded as a direct improvement of the hardware circuit structure. Designers almost get the corresponding hardware circuit structure by programming the improved method flow into the hardware circuit. Therefore, it cannot be said that the improvement of a method flow cannot be realized by hardware entity modules. For example, a Programmable Logic Device (PLD) (eg, Field Programmable Gate Array (FPGA)) is an integrated circuit whose logic function is determined by user programming of the device. It is programmed by the designer to "integrate" a digital system on a PLD without having to ask the chip manufacturer to design and manufacture a dedicated integrated circuit chip. And, instead of making integrated circuit chips by hand, these days, much of this programming is done using software called a "logic compiler", which is similar to the software compiler used in program development and writing, but before compiling The original code also has to be written in a specific programming language, which is called Hardware Description Language (HDL), and there is not only one HDL, but many kinds, such as ABEL (Advanced Boolean Expression Language) , AHDL (Altera Hardware Description Language), Confluence, CUPL (Cornell University Programming Language), HDCal, JHDL (Java Hardware Description Language), Lava, Lola, MyHDL, PALASM, RHDL (RubyHardware Description Language), etc. The most commonly used are VHDL (Very-High-Speed Integrated Circuit Hardware Description Language) and Verilog. It should also be clear to those skilled in the art that a hardware circuit for implementing the logic method process can be easily obtained by simply programming the method process in the above-mentioned several hardware description languages and programming it into the integrated circuit.

The controller may be implemented in any suitable manner, for example, the controller may take the form of eg a microprocessor or processor and a computer readable medium storing computer readable program code (eg software or firmware) executable by the (micro)processor , logic gates, switches, application specific integrated circuits (ASICs), programmable logic controllers and embedded microcontrollers, examples of controllers include but are not limited to the following microcontrollers: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20 and Silicon Labs C8051F320, the memory controller can also be implemented as part of the control logic of the memory. Those skilled in the art also know that, in addition to implementing the controller in the form of pure computer-readable program code, the controller can be implemented as logic gates, switches, application-specific integrated circuits, programmable logic controllers and embedded devices by logically programming the method steps. The same function can be realized in the form of a microcontroller, etc. Therefore, such a controller can be regarded as a hardware component, and the devices included therein for realizing various functions can also be regarded as a structure within the hardware component. Or even, the means for implementing various functions can be regarded as both a software module implementing a method and a structure within a hardware component.

The systems, devices, modules or units described in the above embodiments may be specifically implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer can be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, 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 the convenience of description, when describing the above device, the functions are divided into various units and described respectively. Of course, when implementing the present application, the functions of each unit may be implemented in one or more software and/or hardware.

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, etc.) 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 in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

Memory may include non-persistent memory in computer readable media, random access memory (RAM) and/or non-volatile memory in the form of, for example, read only memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.

Computer-readable media includes both persistent and non-permanent, removable and non-removable media, and storage of information may be implemented by any method or technology. Information may be computer readable instructions, data structures, modules of programs, 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 Disc (DVD) or other optical storage, Magnetic tape cartridges, tape-based disk storage or other magnetic storage devices or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media, such as modulated data signals and carrier waves.

It should also be noted that the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device comprising a series of elements includes not only those elements, but also Other elements not expressly listed, or which are inherent to such a process, method, article of manufacture, or apparatus are also included. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article of manufacture, or device that includes 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 storage devices.

Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, as for the system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and for related parts, please refer to the partial descriptions of the method embodiments.

The above descriptions are merely examples of the present application, and are not intended to limit the present application. Various modifications and variations of this application are possible for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the scope of the claims of this 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 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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