JP2023136848A - Focusing method, electronic instrument and readable storage medium - Google Patents

Abstract

To provide a focusing method, electronic instrument and readable storage medium that relate to a communication technology field.SOLUTION: The present electronic instrument has a lens. The lens includes: a first lens that uses a VCM; and a second lens that is a focus variable lens fixed in an optical axis direction of the lens. One or more first lenses are provided on each of the object side and imaging side of the second lens. A method includes the steps of: controlling so as to move focus of the first lens or focus of the first lens and the second lens to a plurality of prescribed positions; determining a target focal distance corresponding to a contrast peak of the plurality of prescribed positions; and controlling so as to move the focus of the second lens to the target focal distance.SELECTED DRAWING: Figure 2

Description

Embodiments of the present application relate to the field of communication technology, and in particular to focusing methods, electronic devices, and readable storage media.

Currently, there are two main types of autofocus: contrast AF (autofocus) and phase difference AF. Contrast AF is a method that determines the focus position by measuring the contrast peak, so it is characterized by high distance measurement accuracy and the ability to measure distances even to lenses with dark open F-numbers. Furthermore, since imaging and ranging can be performed using all pixels in principle, there is no need for pixel interpolation, and in principle there is no deterioration in image quality. Regarding phase difference AF, since the amount of defocus and the direction of the shift can be known, the lens can be driven instantly. Therefore, it is characteristic that a high-speed focusing operation can be obtained.

The disadvantage of contrast AF is that the defocus amount and blur direction are not known, and if the contrast drops at the start of contrast peak measurement, the driving direction is reversed and the peak is measured again. Furthermore, since the camera once exceeds the peak (overshoots) and then returns to detect the in-focus point, the distance measurement speed inevitably becomes slow. A disadvantage of phase difference AF is that distance measurement accuracy is inferior to contrast AF. Here, generally, a method is used in which the first half is performed by phase difference AF, and the second half is shared by contrast AF.

Regarding speeding up contrast AF processing, conventional technical means include changing the exposure amount so that the contrast peak appears earlier, calculating the contrast value based on the changed subject light, correcting the peak, and changing the focus position. seek.

Regarding the improvement of the accuracy of contrast AF, as a conventional technical means, edge components are calculated in order to prevent false contrast peaks such as camera shake, and this peak is not determined to be the in-focus position.

These methods are effective for calculating the peak value, but the final focus lens operation requires driving a minute actuator, so the overall AF speed depends on the responsiveness and accuracy of the actuator. becomes important.

Currently, the mainstream drive method is often a leaf spring method using VCM. This structure is simple and easy to make, so it can be made relatively inexpensively, and many manufacturers have adopted this method. One of the advantages is that there is less risk of dust generation because there are no sliding parts, but when moving the lens, the balance between the two leaf springs is lost and tilting is likely to occur. Furthermore, the gear configuration also causes backlash, resulting in a large time loss when the driving direction is reversed.

It is an object of the embodiments of the present application to provide a focusing method, an electronic device, and a readable storage medium that can solve the problem of how to speed up autofocus.

In order to solve the above technical problem, the present application is realized as follows.
As a first aspect, embodiments of the present application provide a focusing method applied to an electronic device having a lens. The lens includes a first lens using VCM and a second lens that is a variable focus lens fixed in the optical axis direction of the lens. One or more of the first lenses are provided on the object side and the imaging side of the second lens, respectively. The method includes the steps of controlling the focus of the first lens or the focuses of the first lens and the second lens to move to a plurality of predetermined positions, and a target corresponding to a contrast peak at the plurality of predetermined positions. The method includes determining a focal length, and controlling the focal point of the second lens to move to the target focal length.

In a second aspect, embodiments of the present application provide an electronic device having a lens. The lens includes a first lens using VCM and a second lens that is a variable focus lens fixed in the optical axis direction of the lens. One or more of the first lenses are provided on the object side and the imaging side of the second lens, respectively. The electronic device includes a first control module for controlling the focus of the first lens or the focus of the first lens and the second lens to move to a plurality of predetermined positions; The apparatus further includes a first determination module for determining a target focal length corresponding to a contrast peak, and a second control module for controlling the focal point of the second lens to move to the target focal length.

As a third aspect, embodiments of the present application provide an electronic device having a lens. The lens includes a first lens using VCM and a second lens that is a variable focus lens fixed in the optical axis direction of the lens. One or more of the first lenses are provided on the object side and the imaging side of the second lens, respectively. The electronic device further includes a processor, a memory, and a program or instructions stored in the memory and executable by the processor, and when the program or instructions are executed by the processor, the electronic device according to the first aspect Realize the steps of the focusing method.

As a fourth aspect, embodiments of the present application provide a readable storage medium having stored thereon a program or instructions that, when executed by a processor, implement the steps of the focusing method according to the first aspect.

In a fifth aspect, embodiments of the present application provide a chip comprising a processor for executing a program or instructions to realize the method according to the first aspect, and a communication interface coupled to the processor. do.

In the embodiment of the present application, when moving to detect the focus position where the contrast peak occurs, only the VCM (i.e., the first lens) or both the VCM and the variable focus lens (i.e., the second lens) are used together. make it work. Then, the focus position is calculated, and when the lens moves toward the focus position and starts moving again, only the variable focus lens is operated. In this way, by driving the variable focus lens without using VCM, we can minimize response speed delay factors caused by actuators and assembly precision, and the phenomenon of exceeding the contrast peak many times (overshoot). Optimize focus speed.

FIG. 1 is a schematic configuration diagram of a lens in an embodiment of the present application. FIG. 2 is a flowchart of a focusing method in an embodiment of the present application. FIG. 3a is a first diagram showing the position of the target focal length in the embodiment of the present application. FIG. 3b is a second diagram showing the position of the target focal length in the embodiment of the present application. FIG. 3c is a third diagram showing the position of the target focal length in the embodiment of the present application. FIG. 3d is a fourth diagram showing the position of the target focal length in the embodiment of the present application. FIG. 4 is a first diagram showing a method for determining the lens drive direction in the embodiment of the present application. FIG. 5 is a second diagram showing a method for determining the lens driving direction in the embodiment of the present application. FIG. 6 is a third diagram showing a method for determining the lens drive direction in the embodiment of the present application. FIG. 7 is a fourth diagram showing a method for determining the lens drive direction in the embodiment of the present application. FIG. 8 is a schematic configuration diagram of an electronic device in an embodiment of the present application.

The technical solutions in the embodiments of the present application are clearly and completely explained in conjunction with the drawings in the embodiments of the present application. It is clear that the described embodiments are some, but not all, embodiments of the present application. Based on the embodiments in this application, all other embodiments that can be obtained by a person skilled in the art without any creative efforts fall within the protection scope of this application.

The terms "first," "second," etc. in the specification and claims of this application are not used to describe a particular order or sequential order, but to distinguish between similar subject matter. used. Data used in this manner may be interchangeable where appropriate, such as "first", "second", etc., so that the embodiments of the present application may be practiced in orders other than those illustrated or described herein. It should be understood that the objects distinguished by are generally similar, and the number of objects is not limited, for example, the first object may be one or more than one. Further, in the specification and claims, "and/or" indicates at least one of the linked objects. "/" generally indicates that the related objects before and after it are in an "or" relationship.

Hereinafter, technical solutions in the embodiments of the present application will be explained in detail through specific embodiments and their application scenes with reference to the drawings.

Referring to FIG. 1, a configuration of a lens of an electronic device in an embodiment of the present application is shown. The lens includes a first lens 1 and a second lens 2 fixed in the optical axis direction of the lens. One or more first lenses 1 are provided on the object side and the imaging side of the second lens 2, respectively. For example, in the scene shown in FIG. 1, two first lenses 1 are provided on one side of the second lens 2, and one first lens 1 is provided on the other side. The engineer can adjust the number of first lenses 1 according to actual requirements. Here, the first lens 1 is a lens using VCM, and can be abbreviated as VCM or VCM lens. The first lens 1 is movable back and forth in the optical axis direction, specifically in the moving direction indicated by the broken line arrow in FIG. The second lens 2 is a variable focus lens, and there are multiple candidates such as a liquid lens and a film lens.A specific focus control method is to apply a voltage without moving the lens in the optical axis direction. This changes the focal point position.

Referring to FIG. 2, the embodiment of the present application provides a focusing method applied to an electronic device having the lens shown in FIG. a step 201 of controlling the focus to move to a plurality of predetermined positions; a step 202 of determining target focal lengths corresponding to contrast peaks at the plurality of predetermined positions; and a step 202 of controlling the focus of the second lens to move to the target focal length. and step 203 for controlling.

In the embodiments of the present application, contrast peaks at a plurality of predetermined positions can be obtained by first operating with a VCM (i.e., the first lens) or by operating in combination with both the VCM and the variable focus lens (i.e., the second lens). After the target focal length corresponding to , that is, the focus position is calculated, and the focus position is determined, only the variable focus lens is operated. In this way, by driving the variable focus lens without using VCM, we can minimize the response speed delay factors caused by the actuator and assembly precision, and the phenomenon of exceeding the contrast peak many times (overshoot), and improve the focus. Optimize speed.

Note that the plurality of predetermined positions are specifically focal positions corresponding to a plurality of focal lengths, and the specific target focal length is the focal length at the plurality of predetermined positions and the corresponding contrast value (or contrast evaluation value).

In a specific embodiment, after controlling the focus of the second lens to move to the target focal length, the method includes determining whether the current contrast has reached a maximum value; When the maximum value is reached, the control of the focus movement of the second lens is stopped (that is, the focus position at this time is the position where the contrast is maximum, and the focus position is appropriate); If the current contrast has not reached the maximum value, the process returns to the step of controlling the focus of the first lens or the focus of the first lens and the second lens to move to a plurality of predetermined positions (i.e., step 201). It further includes.

In the embodiment of the present application, a feedback adjustment mechanism is implemented by determining whether the current contrast has reached the maximum value, and the focus position is appropriately secured.

A specific target focal length determination process will be described below.

In a specific embodiment, the plurality of predetermined locations includes a first location, a second location, and a third location. That is, in step 201, the focal point of the lens is moved to three points, and the position where the contrast evaluation value is maximum is detected. Here, the first position is located between the second position and the third position. The focal length of the first position is X1, the contrast value of the first position is Y1, the focal length of the second position is X2, and the contrast value of the second position is Y2. , the focal length at the third position is X3, the contrast value at the third position is Y3, and the target focal length is X _peak . Determining target focal lengths corresponding to contrast peaks at multiple predetermined locations includes the following four methods.
(1) Referring to FIG. 3a, when the contrast value Y1 at the first position X1 is a contrast peak, the corresponding conditional expression is Y2=Y3. In this case, interpolation processing for calculating the contrast peak is not necessary, and the peak position can be detected using the following calculation formula.
(2) Referring to FIG. 3b, when the contrast value Y1 at the first position X1 and the contrast value Y2 at the second position X2 are the same, the corresponding conditional expression is Y1=Y2. In this case, interpolation processing for calculating the contrast peak is not necessary, and the peak position can be detected using the following calculation formula.
(3) Referring to FIG. 3c, if the contrast peak is closer to the position after the search, then X _peak is closer to X1. In this case, it is necessary to perform interpolation processing to detect the contrast peak position. Here, interpolation processing using first-order approximation will be explained. First, the slope A1 and intercept B1 of a straight line passing through (X1, Y1) and (X3, Y3) are determined.
The sign of the slope of this straight line is reversed to find the slope A2 and intercept B2 of the straight line passing through (X2, Y2).
Then, the X coordinate of the intersection of these two straight lines becomes X _peak .
(4) Referring to FIG. 3d, if the contrast peak is on the Far side of the position after the search, X _peak is on the Far side of X1. In this case as well, interpolation processing is required as in (3), and the calculation formula is the same as (3), so it will be omitted here.

After the lens position X _peak of the target is detected as described above, in the present invention, movement to the target is performed as shown in FIG. When contrast AF is started, it is first operated with lens focus using VCM. At this time, the VCM and the variable focus lens may be operated together. The above lens is driven while sequentially analyzing contrast information, and after detecting X _peak , the operation is switched to only the variable focus lens and the lens is driven in the opposite direction.

An advantage of this embodiment is that when calculating X _peak at the start of contrast AF operation, when operating with VCM and a variable focus lens, the contrast peak can be detected faster than when operating with only normal VCM. Is possible. Furthermore, by driving only the variable focus lens after detecting X _peak , the operation up to the focus determination position becomes faster. One of the reasons for this is that the variable focus lens has better responsiveness than the VCM. Mechanisms using VCM usually include mechanical parts such as leaf springs and gears. Here, responsiveness deteriorates due to backlash, physical wear, and assembly errors. In general, variable focus lenses can be expected to improve responsiveness by a factor of 10 compared to VCM. Furthermore, the variable focus lens can be positioned more accurately than the VCM, which improves the phenomenon of overshooting again in the reversal operation after the contrast peak has been exceeded. This improves the precision of focus determination and improves the precision of AF. Furthermore, there is a concern that power consumption will increase due to the combined use of a VCM and a variable focus lens, but the power consumption of a variable focus lens is about 1/5 to 1/10 of that of a VCM, so there is little effect on the system as a whole. Furthermore, if the VCM or the variable focus lens is driven in the wrong direction at the start of contrast AF, the contrast will deteriorate, so the actuator must be reversed to measure the contrast peak. Here, if the VCM is operated, time is wasted when the drive direction is reversed due to factors such as responsiveness and backlash.

In a specific embodiment, before controlling the focus of the first lens or the focus of the first lens and the second lens to move to the plurality of predetermined positions, the method includes moving the focus of the second lens to the first position. determining whether the current contrast continues to decrease; and if the current contrast continues to decrease, changing the focus of the second lens to a second lens opposite to the first direction; After controlling the movement in the direction, performing a step of controlling the focus of the first lens or the focus of the first lens and the second lens to move to a plurality of predetermined positions along the second direction. , if the current contrast does not continue to decrease, controlling the focus of the first lens or the focus of the first lens and the second lens to move to a plurality of predetermined positions along the first direction. The method further includes: performing.

Specifically, the operations are performed as shown in Figs. 5 and 6, the focus is changed using a variable focus lens until the driving direction is reliably determined, and the subsequent movement to the contrast peak is performed using the method shown in Fig. 2. Implemented in process.

As an advantage of the present embodiment, a method is proposed in which only the variable focus lens is used at the start of contrast AF, which has the effect of minimizing time loss caused by misjudgment of the driving direction during the initial operation of contrast AF.

In a specific embodiment, before controlling the focus of the first lens or the focus of the first lens and the second lens to move to the plurality of predetermined positions, the method includes reciprocating the focus of the second lens. and determining a target direction and controlling the focus of the first lens or the focuses of the first lens and the second lens to move to a plurality of predetermined positions along the target direction. The method further includes: performing.

Specifically, as shown in Figure 7, the method of identifying the direction of movement at the start of contrast AF is to move the focus position of the variable focus lens back and forth at high speed, check the contrast of the subject, and check whether the subject is in the foreground. There is a method called wobbling to find out whether the object is deep or deep, and the voltage is specifically controlled to make the object oscillate at high speed. During this wobbling operation, a variable focus lens with good responsiveness is used instead of a VCM.

An advantage of this embodiment is that the direction of the peak search can be quickly determined by using the variable focus lens in a wobbling operation. This wobbling operation improves the speed by a factor of 10 compared to when using VCM. After this, a further speed improvement is achieved by performing a shift to the contrast peak by the process of the method shown in FIG.

We propose a method of using only a variable focus lens at the start of contrast AF, which has the effect of minimizing time loss due to misjudgment of the driving direction during the initial operation of contrast AF.

Note that the focusing method in the embodiment of the present application may be executed by a virtual device in an electronic device, or by a control module for executing the focusing method in the virtual device. In an embodiment of the present application, an electronic device according to an embodiment of the present application will be described using an example in which a focusing method is executed with a virtual device.

In embodiments of the present application, an electronic device having a lens is further provided. The lens includes a first lens using VCM and a second lens that is a variable focus lens fixed in the optical axis direction of the lens. One or more of the first lenses are provided on the object side and the imaging side of the second lens, respectively. The electronic device includes a first control module for controlling the focus of the first lens or the focus of the first lens and the second lens to move to a plurality of predetermined positions; The apparatus further includes a first determination module for determining a target focal length corresponding to a contrast peak, and a second control module for controlling the focal point of the second lens to move to the target focal length.

In a specific embodiment, the electronic device determines whether the current contrast has reached a maximum value after controlling the focal point of the second lens to move to the target focal length, and If the contrast has reached the maximum value, instruct the second control module to stop controlling the focus movement of the second lens, and if the current contrast has not reached the maximum value, the first lens or a focus of the first lens and the second lens to a plurality of predetermined positions. .

In a specific embodiment, the plurality of predetermined locations includes a first location, a second location, and a third location. The first position is located between the second position and the third position. The focal length of the first position is X1, the contrast value of the first position is Y1, the focal length of the second position is X2, and the contrast value of the second position is Y2, the focal length at the third position is X3, the contrast value at the third position is Y3, and the target focal length is X _peak .
Specifically, the first determination module
If Y2=Y3,
decided to be,
If Y1=Y2,
decided to be,
If X _peak is on the Near side of X1, or if X _peak is on the Far side of X1,
Decide to be.

In a specific embodiment, the electronic device moves the focus of the first lens or the focus of the first lens and the second lens to a plurality of predetermined positions before moving the focus of the first lens to a plurality of predetermined positions. a third control module for controlling the movement of the focal point of the second lens in a first direction; and determining whether the current contrast continues to decrease, and if the current contrast continues to decrease, moving the focal point of the second lens in a first direction. instructing the third control module to control movement in a second direction opposite to the first direction, and then moving the focal point of the first lens along the second direction; instructing the first control module to perform the step of controlling the focus of the first lens and the second lens to move to a plurality of predetermined positions, and if the current contrast does not continue to decrease, the first control module the first control to perform the step of controlling the focus of the first lens or the focus of the first lens and the second lens to move to a plurality of predetermined positions along a direction of and a second determination module for instructing the module.

In a specific embodiment, the electronic device moves the focus of the first lens or the focus of the first lens and the second lens to a plurality of predetermined positions before moving the focus of the first lens to a plurality of predetermined positions. a fourth control module for controlling the focal point of the first lens to swing back and forth; and a fourth control module for determining a target direction and controlling the focal point of the first lens or the first lens and the second lens along the target direction. and a second determining module for instructing the first control module to perform the step of controlling the focal point of a lens to move to a plurality of predetermined positions.

The virtual module in the above embodiments may be a device, a component, an integrated circuit, or a chip in a terminal. The device may be a mobile electronic device or a non-mobile electronic device. Typically, mobile electronic devices are mobile phones, tablets, laptops, handhelds, in-vehicle electronics, wearable devices, etc., and non-mobile electronic devices are personal computers (PCs), televisions (TVs), etc. Examples include lockers and self-service machines, but are not particularly limited in the embodiments of the present application.

A virtual module in embodiments of the present application may be a device with an operating system. This operating system may be an Android operating system, an iOS operating system, or any other possible operating system, but is not particularly limited in the embodiments of the present application.

FIG. 8 is a diagram showing a hardware configuration of an electronic device that implements an embodiment of the present application.

This electronic device 800 includes a radio frequency unit 801, a network module 802, an audio output unit 803, an input unit 804, a sensor 805, a display unit 806, a user input unit 807, an interface unit 808, and a memory 809. and components such as, but not limited to, processor 810.

As will be understood by those skilled in the art, electronic device 800 may include a power source (e.g., a battery) to power each component, and the power source may be logically connected to processor 810 via a power management system. Ru. As a result, functions such as charging, discharging, and power consumption management are realized by the power management system. The configuration of the electronic device shown in FIG. 8 is not limited to electronic devices. An electronic device may have more or fewer parts than those shown, some parts may be combined, or different parts may be arranged, but these are omitted here. .

The processor 810 controls the focus of the first lens or the focus of the first lens and the second lens to move to a plurality of predetermined positions, and corresponds to contrast peaks at the plurality of predetermined positions. It is used to determine the target focal length and to control the focal point of the second lens to move to the target focal length.

Optionally, the processor 810 further determines whether the current contrast has reached a maximum value after controlling the focus of the second lens to move to the target focal length. , if the current contrast has reached a maximum value, stop controlling the focus movement of the second lens, and if the current contrast has not reached the maximum value, the focus of the first lens or the It is used to return to the step of controlling the focal points of the first lens and the second lens to move to a plurality of predetermined positions.

Selectably, the plurality of predetermined locations includes a first location, a second location, and a third location, and the first location is between the second location and the third location. , the focal length of the first position is X1, the contrast value of the first position is Y1, the focal length of the second position is X2, and the focal length of the second position is The contrast value of is Y2, the focal length of the third position is X3, the contrast value of the third position is Y3, and the target focal length is X _peak . Optionally, the processor 810 further: if Y2=Y3;
If Y1=Y2,
If X _peak is on the Near side of X1, or if X _peak is on the Far side of X1,
It is used to determine the

Optionally, the processor 810 further controls the movement of the second lens before controlling the focus of the first lens, or the focus of the first lens and the second lens, to move to a plurality of predetermined positions. controlling the focus to move in a first direction; determining whether the current contrast continues to decrease; and if the current contrast continues to decrease, moving the focus of the second lens to the first direction; After controlling the movement in a second direction opposite to the above direction, the focus of the first lens or the focus of the first lens and the second lens is moved to a plurality of predetermined positions along the second direction. and, if the current contrast does not continue to decrease, the focal point of the first lens, or the focus of the first lens and the first lens, along the first direction. The second lens is used to perform a step of controlling the focal point of the second lens to move to a plurality of predetermined positions.

Optionally, the processor 810 further controls the movement of the second lens before controlling the focus of the first lens, or the focus of the first lens and the second lens, to move to a plurality of predetermined positions. The focus is controlled to swing back and forth, and a target direction is determined, and along the target direction, the focus of the first lens, or the focus of the first lens and the second lens is adjusted to a plurality of positions. It is used to execute the step of controlling the movement to a predetermined position.

It should be appreciated that, in embodiments of the present application, input unit 804 may include a graphics processor GPU (Graphics Processing Unit) 8041 and a microphone 8042. Graphics processor 8041 processes image data of still or video images captured by an image capture device (eg, camera) in video capture mode or image capture mode. The display unit 806 can include a display panel 8061, and the display panel 8061 can be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. User input unit 807 includes a touch panel 8071 and other input devices 8072. The touch panel 8071 is also called a touch screen. The touch panel 8071 can include two parts: a touch sensing device and a touch controller. Other input devices 8072 include, but are not limited to, a physical keyboard, a volume control key, function keys such as a switch key, a trackball, a mouse, and a control lever. Memory 809 is used to store software programs and various types of data, including, but not limited to, application programs and operating systems. Processor 810 can integrate an application processor that primarily processes an operating system, user interface, application programs, etc., and a modulation/demodulation processor that primarily processes wireless communications. It should be understood that the modulation and demodulation processor described above may not be integrated into processor 810.

Further, the embodiments of the present application may further provide a readable storage medium storing programs or instructions that, when executed by a processor, realize each process of the above embodiments of the focusing method, and achieve the same technical effect. Although it is possible, we omit the explanation here to avoid duplication.

Here, the processor is a processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

Embodiments of the present application further provide a chip including a processor for executing a program or instructions to realize each process of the embodiment of the focusing method described above, and a communication interface coupled to the processor, the chip comprising the same technology. Although it can be effective, we will omit its explanation here to avoid duplication.

It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system level chips, system chips, chip systems, on-chip system chips, etc.

It is noted that herein the term "comprising", "containing", or any other variation thereof is intended to cover non-exclusive inclusion. Thus, a process, method, article, or device that includes a set of elements can include not only those elements but also other elements not explicitly listed. Alternatively, it may further include elements specific to such a process, method, article or apparatus. Unless further limited, an element qualified by the phrase ``comprising a'' excludes the presence of any other identical element in a process, method, article, or apparatus that includes that element. It's not something you do. It should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to the functions being performed in the order illustrated or discussed; Alternatively, it is possible to perform the functions in the reverse order, eg, it is possible to perform the methods described in a different order than in the order described. Furthermore, various steps may be added, omitted, or combined. Furthermore, features described with reference to some examples may be combined in other examples.

As is clear to those skilled in the art from the description of the embodiments above, the method of the embodiment described above can be realized by adding an essential general-purpose hardware platform to software, or of course can be realized by hardware. Although it is also possible to do so, the former is often the more preferred embodiment. Based on this understanding, the technical solution of the present application can be embodied as a software product essentially or in parts contributing to the prior art. The computer software product is stored on a single storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and can perform the methods described in each embodiment of the present application on a single device (such as a mobile phone, computer, server, air conditioner, or network). Contains several instructions for the device (such as a device) to execute.

Although the embodiments of the present application have been described above in detail with reference to the accompanying drawings, the present application is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are merely illustrative. It is not something that is restrictive. Those skilled in the art will receive a hint from this application and will make many forms without departing from the spirit of this application or the scope protected by the claims, all of which fall within the protection of this application.

Claims (12)

In a focusing method applied to an electronic device having a lens,
The lens includes a first lens using VCM and a second lens that is a variable focus lens fixed in the optical axis direction of the lens,
One or more of the first lenses are provided on the object side and the imaging side of the second lens, respectively,
The method includes:
controlling the focus of the first lens or the focus of the first lens and the second lens to move to a plurality of predetermined positions;
determining target focal lengths corresponding to contrast peaks at the plurality of predetermined positions;
The method is characterized by including the step of controlling the focal point of the second lens to move to the target focal length. The method according to claim 1,
After controlling the focal point of the second lens to move to the target focal length,
determining whether the current contrast has reached its maximum value;
When the current contrast reaches a maximum value, stopping control of the focus movement of the second lens;
If the current contrast has not reached the maximum value, the process returns to the step of controlling the focus of the first lens or the focus of the first lens and the second lens to move to a plurality of predetermined positions. It is characterized by further including. The method according to claim 1,
The plurality of predetermined positions include a first position, a second position, and a third position,
the first position is located between the second position and the third position,
The focal length of the first position is X1, the contrast value of the first position is Y1, the focal length of the second position is X2, and the contrast value of the second position is Y2, the focal length at the third position is X3, the contrast value at the third position is Y3, and the target focal length is _Xpeak ,
The step of determining a target focal length corresponding to the contrast peaks at the plurality of predetermined positions includes:
If Y2=Y3,
to decide to be;
If Y1=Y2,
to decide to be;
If X _peak is on the Near side of X1, or if X _peak is on the Far side of X1,
It is characterized by including determining that The method according to claim 1,
Before controlling the focus of the first lens or the focus of the first lens and the second lens to move to a plurality of predetermined positions,
controlling the focus of the second lens to move in a first direction;
determining whether the current contrast continues to decrease;
If the current contrast continues to decrease, after controlling the focus of the second lens to move in a second direction opposite to the first direction, the first lens or the focus of the first lens and the second lens to a plurality of predetermined positions;
If the current contrast does not continue to decrease, the focus of the first lens or the focus of the first lens and the second lens are moved to a plurality of predetermined positions along the first direction. The method further comprises: performing a step of controlling the method. The method according to claim 1,
Before controlling the focus of the first lens or the focus of the first lens and the second lens to move to a plurality of predetermined positions,
controlling the focal point of the second lens to swing back and forth;
determining a target direction and controlling the focal point of the first lens or the focal points of the first lens and the second lens to move to a plurality of predetermined positions along the target direction; It is characterized by further including. An electronic device having a lens,
The lens includes a first lens using VCM and a second lens that is a variable focus lens fixed in the optical axis direction of the lens,
One or more of the first lenses are provided on the object side and the imaging side of the second lens, respectively,
The electronic device is
a first control module for controlling the focus of the first lens or the focus of the first lens and the second lens to move to a plurality of predetermined positions;
a first determination module for determining target focal lengths corresponding to contrast peaks at the plurality of predetermined positions;
The image forming apparatus may further include a second control module for controlling the focal point of the second lens to move to the target focal length. The electronic device according to claim 6,
After controlling the focus of the second lens to move to the target focal length, determining whether the current contrast has reached a maximum value;
instructing the second control module to stop controlling the focus movement of the second lens if the current contrast reaches a maximum value;
If the current contrast has not reached the maximum value, performing the step of controlling the focus of the first lens or the focus of the first lens and the second lens to move to a plurality of predetermined positions. The method further includes a first determination module for instructing the first control module to. The electronic device according to claim 6,
The plurality of predetermined positions include a first position, a second position, and a third position,
the first position is located between the second position and the third position,
The focal length of the first position is X1, the contrast value of the first position is Y1, the focal length of the second position is X2, and the contrast value of the second position is Y2, the focal length at the third position is X3, the contrast value at the third position is Y3, and the target focal length is _Xpeak ,
The first determination module includes:
If Y2=Y3,
decided to be,
If Y1=Y2,
decided to be,
If X _peak is on the Near side of X1, or if X _peak is on the Far side of X1,
It is characterized by determining that The electronic device according to claim 6,
controlling the focus of the second lens to move in a first direction before controlling the focus of the first lens or the focus of the first lens and the second lens to move to a plurality of predetermined positions; a third control module;
Determine whether the current contrast continues to decrease,
If the current contrast continues to decrease, instruct the third control module to control the movement of the focus of the second lens in a second direction opposite to the first direction; the first control module to perform the step of controlling the focus of the first lens, or the focus of the first lens and the second lens, to move to a plurality of predetermined positions along the direction; instruct,
If the current contrast does not continue to decrease, the focus of the first lens or the focus of the first lens and the second lens are moved to a plurality of predetermined positions along the first direction. and a second determination module for instructing the first control module to perform the control step. The electronic device according to claim 6,
to control the focus of the second lens to swing back and forth before controlling the focus of the first lens or the focus of the first lens and the second lens to move to a plurality of predetermined positions; a fourth control module;
determining a target direction and controlling the focal point of the first lens or the focal points of the first lens and the second lens to move to a plurality of predetermined positions along the target direction; and a second determination module for instructing the first control module to do so. An electronic device having a lens,
The lens includes a first lens using VCM and a second lens that is a variable focus lens fixed in the optical axis direction of the lens,
One or more of the first lenses are provided on the object side and the imaging side of the second lens, respectively,
The electronic device is
further comprising a processor, a memory, and a program or instructions stored in the memory and executable by the processor;
It is characterized in that when the program or instructions are executed by the processor, the steps of the focusing method according to any one of claims 1 to 5 are realized. A readable storage medium, characterized in that a program or instructions are stored thereon, which, when executed by a processor, realize the steps of the focusing method according to any one of claims 1 to 5.