CN106534666A - Phase focusing method, device and terminal equipment - Google Patents

Abstract

The present application discloses a phase focusing method, device and terminal equipment. The method includes: during the phase focusing process, determining whether the difference of the phase detection data is less than a preset threshold value; if the difference of the phase detection data is less than the threshold value, performing image acquisition at a preset frequency and obtaining the scene contrast of each frame of the image; determining the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame of the image; and adjusting the lens position accordingly according to the in-focus position of the target image frame. Through the embodiments of the present application, the accuracy of focusing can be guaranteed and the speed of focusing can be improved.

Description

Phase focusing method, device and terminal equipment

technical field

The present application relates to the field of imaging technology, and in particular to a phase focusing method, device and terminal equipment.

Background technique

With the development of terminal equipment, whether to configure the camera function has become a major factor for users to choose terminal equipment. Users also have higher and higher requirements for the camera function of terminal equipment, that is, they can quickly obtain clear images.

Phase focusing is used more and more because of its speed. However, because the acquisition phase pixels are easily affected by noise, unstable external light, etc., the phase data output is unstable, and sometimes the calculated out-of-focus position is unstable, which eventually leads to a slow and inaccurate focusing process.

Contents of the invention

This application aims to solve one of the technical problems in the related art at least to a certain extent.

Therefore, an object of the present application is to propose a phase focusing method, which can ensure the accuracy of focusing and improve the speed of focusing.

The first purpose of the present application is to propose a phase focusing method.

The second purpose of the present application is to propose a phase focusing device.

The third purpose of the present application is to provide a terminal device.

The fourth objective of the present application is to provide a non-transitory computer-readable storage medium.

The fifth object of the present application is to provide a computer program product.

To achieve the above purpose, a phase focusing method proposed according to the embodiment of the first aspect of the present application includes the following steps:

During the phase focusing process, it is judged whether the difference of the phase detection data is smaller than a preset threshold value;

If the difference of the phase detection data is less than the threshold value, image acquisition is performed according to a preset frequency, and the scene contrast of each frame of image is acquired;

Determine the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame of image;

The lens position is adjusted accordingly according to the in-focus position of the target image frame.

In the phase focusing method of the embodiment of the present application, firstly, during the phase focusing process, it is judged whether the difference of the phase detection data is less than the preset threshold value, and then the phase detection data difference is less than the threshold value, and then it is performed according to the preset frequency. Image acquisition, and obtain the scene contrast of each frame of image, then determine the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame of image, and finally adjust the lens position according to the in-focus position of the target image frame. Therefore, the accuracy of focusing can be ensured, and the speed of focusing can be improved.

To achieve the above purpose, a phase focusing device proposed according to the embodiment of the first aspect of the present application includes:

A judging module, configured to judge whether the difference of the phase detection data is less than a preset threshold value during the phase focusing process;

An acquisition module, configured to perform image acquisition according to a preset frequency when the difference of the phase detection data is less than the threshold value;

An acquisition module, configured to acquire the scene contrast of each frame of image;

A determining module, configured to determine the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame of image;

The adjustment module is configured to adjust the lens position correspondingly according to the in-focus position of the target image frame.

In the phase focusing device of the embodiment of the present application, firstly, during the phase focusing process, it is judged whether the difference of the phase detection data is less than the preset threshold value, and then the phase detection data difference is smaller than the threshold value, and then the phase focusing is performed according to the preset frequency. Image acquisition, and obtain the scene contrast of each frame of image, then determine the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame of image, and finally adjust the lens position according to the in-focus position of the target image frame. Therefore, the accuracy of focusing can be ensured, and the speed of focusing can be improved.

To achieve the above purpose, a terminal device according to the embodiment of the third aspect of the present application includes: a housing, a processor, a memory, a circuit board, and a power supply circuit, wherein the circuit board is arranged in the housing to form a Inside the space, the processor and the memory are arranged on the circuit board; the power supply circuit is used to supply power to each circuit or device of the terminal device; the memory is used to store executable program codes; the The processor runs a program corresponding to the executable program code by reading the executable program code stored in the memory, so as to perform the following steps:

During the phase focusing process, it is judged whether the difference of the phase detection data is smaller than a preset threshold value;

If the difference of the phase detection data is less than the threshold value, image acquisition is performed according to a preset frequency, and the scene contrast of each frame of image is obtained;

Determine the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame of image;

The lens position is adjusted accordingly according to the in-focus position of the target image frame.

The terminal device of the embodiment of the present application firstly determines whether the difference of the phase detection data is less than the preset threshold value during the phase focusing process, and then performs image processing according to the preset frequency when the difference of the phase detection data is less than the threshold value. Collect and obtain the scene contrast of each frame of image, then determine the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame of image, and finally adjust the lens position correspondingly according to the in-focus position of the target image frame. Therefore, the accuracy of focusing can be ensured, and the speed of focusing can be improved.

To achieve the above purpose, a non-transitory computer-readable storage medium is proposed according to the embodiment of the fourth aspect of the present application. When the instructions in the storage medium are executed by the processor of the mobile terminal, the mobile terminal can execute a A phase focusing method, said method comprising:

During the phase focusing process, it is judged whether the difference of the phase detection data is smaller than a preset threshold value;

If the difference of the phase detection data is less than the threshold value, image acquisition is performed according to a preset frequency, and the scene contrast of each frame of image is obtained;

Determine the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame of image;

The lens position is adjusted accordingly according to the in-focus position of the target image frame.

To achieve the above purpose, according to a computer program product proposed in an embodiment of the fifth aspect of the present application, when the instruction processor in the computer program product executes, a phase focusing method is executed, the method includes:

During the phase focusing process, it is judged whether the difference of the phase detection data is smaller than a preset threshold value;

If the difference of the phase detection data is less than the threshold value, image acquisition is performed according to a preset frequency, and the scene contrast of each frame of image is acquired;

Determine the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame of image;

The lens position is adjusted accordingly according to the in-focus position of the target image frame.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, wherein:

FIG. 1 is a flowchart of a phase focusing method according to an embodiment of the present application;

FIG. 2 is a flowchart of a phase focusing method according to another embodiment of the present application;

Fig. 3 is a schematic diagram of scene contrast according to an embodiment of the present application;

Fig. 4 is a schematic diagram of scene contrast according to another embodiment of the present application;

Fig. 5 is a schematic diagram of scene contrast according to another embodiment of the present application;

FIG. 6 is a schematic structural diagram of a phase focusing device according to an embodiment of the present application; and

Fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

detailed description

Embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary, and are intended to explain the present application, and should not be construed as limiting the present application.

The following describes the phase focusing method, device and terminal equipment according to the embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a flowchart of a phase focusing method according to an embodiment of the present application.

As shown in Figure 1, the phase focusing method of the embodiment of the present application includes the following steps:

Step 101, during the phase focusing process, it is judged whether the difference of the phase detection data is smaller than a preset threshold value.

Step 102, if the difference of the phase detection data is smaller than the threshold value, image acquisition is performed according to a preset frequency, and the scene contrast of each frame of image is acquired.

Specifically, the phase focusing method provided in this embodiment is configured in electronic devices such as mobile phones, computers, and smart wearable devices that have a camera function.

Usually, in order to obtain a clear image, it is necessary to change the object distance and the position of the distance through the camera focusing mechanism, and the process of making the subject image clear is focusing. Among them, phase focusing has fast speed and high precision, and it is used more and more. However, the acquisition of phase pixels in phase focusing is easily affected by noise, unstable external light, etc. There are problems such as slow focusing process and low accuracy.

In order to solve the above problem, an embodiment of the present application proposes a phase focusing method. During phase focusing, the focus position is assisted by scene contrast statistical comparison, so as to ensure the accuracy of focusing and improve the speed of focusing.

Specifically, in the process of phase focusing, two images can be acquired, thereby the image pixel waveforms of the two images can be obtained, and the difference value of the phase detection data can be calculated according to the image pixel waveforms of the two images, and according to the phase detection The difference of the data is used for phase focusing.

It is understandable that the sharpest image can be obtained when the difference of the phase detection data approaches zero. However, the difference value of the phase detection data is unstable. When focusing, the present application no longer refers to whether the difference value of the phase detection data approaches zero, but determines the focus position according to the scene contrast of each frame of image. The specific instructions are as follows:

First, it is judged whether the difference of the phase detection data is smaller than a preset threshold value. When the difference of the phase detection data is less than the threshold value, it means that the in-focus position is very close, so that the image acquisition can be performed according to the preset frequency, and the scene contrast of each frame of image can be obtained.

Wherein, the preset threshold value can be selected and set according to actual application needs. The preset frequency can be selected and set according to actual application needs.

Among them, there are many ways to obtain the scene contrast of each frame of image, which can be selected and set according to actual application needs.

Specifically, in this example, image processing data such as pixels of each frame of image may be obtained, and the image processing data may be filtered according to a preset algorithm to obtain the scene contrast of each frame of image. Among them, the preset algorithm can be selected and set according to actual application needs, such as Kalman filter algorithm, median filter algorithm, and the like.

Step 103: Determine the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame of image.

Step 104, adjust the lens position accordingly according to the in-focus position of the target image frame.

Specifically, the higher the scene contrast, the clearer the image. Therefore, it is necessary to determine the target image frame corresponding to the maximum scene contrast, so that the position corresponding to the target image frame is the in-focus position, and finally adjust the lens position accordingly according to the in-focus position.

Among them, there are many ways to determine the maximum value of scene contrast, which can be selected and set according to actual application requirements. Examples are as follows:

In the first example, the maximum value of the scene contrast can be obtained through multiple rounds of comparison by obtaining the scene contrast of all image frames.

In the second example, the scene contrast of the current image frame can be compared with the scene contrast of the previous and subsequent image frames through the slope climbing algorithm. If the scene contrast of the current image frame is larger than that of the previous and subsequent image frames, and the scene contrast tends to decrease If a certain value is satisfied, the scene contrast of the current image frame is the maximum value of the scene contrast.

The maximum value of the scene contrast can be obtained by any of the above methods, thus, the target image frame corresponding to the maximum value of the scene contrast, and finally the lens position is adjusted accordingly according to the in-focus position of the target image frame.

In the phase focusing method of the embodiment of the present application, firstly, during the phase focusing process, it is judged whether the difference of the phase detection data is less than the preset threshold value, and then the phase detection data difference is less than the threshold value, and then it is performed according to the preset frequency. Image acquisition, and obtain the scene contrast of each frame of image, then determine the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame of image, and finally adjust the lens position according to the in-focus position of the target image frame. Therefore, the accuracy of focusing can be ensured, and the speed of focusing can be improved.

Fig. 2 is a flowchart of a phase focusing method according to another embodiment of the present application.

As shown in Figure 2, the phase focusing method of the embodiment of the present application includes the following steps:

Step 201, during the phase focusing process, it is judged whether the difference of the phase detection data is smaller than a preset threshold value.

Step 202 , if the difference of the phase detection data is smaller than the threshold value, image acquisition is performed according to a preset frequency, and the scene contrast of each frame of image is acquired.

It should be noted that the description of steps S201-S202 corresponds to the above-mentioned steps S101-S102, therefore, the description of the corresponding steps S202-S202 refers to the description of the above-mentioned steps S101-S102, which will not be repeated here.

Step 203, the first scene contrast of the Kth image frame acquired at the T cycle time and the second scene contrast of the (K-1)th image frame acquired at the (T-1) cycle time, and with the ( The contrast of the third scene of the (K+1)th image frame acquired at the time of the T+1) period is compared respectively.

Step 204, if it is known that the contrast of the first scene is smaller than the contrast of the second scene, the contrast of the third scene is smaller than the contrast of the first scene, and the downward trend of scene contrast meets the preset threshold, then determine the (K-1)th image frame as the target image frame .

Step 205, if it is known that the contrast of the first scene is smaller than the contrast of the second scene and the contrast of the third scene is larger than the contrast of the first scene, continue to detect the change trend of the scene contrast of the subsequent image frames collected to determine the target image frame.

Specifically, at first, three image frames of the Kth image frame, the (K-1)th image frame, and the (K-1)th image frame are respectively acquired at three cycle times of T, T-1, and T+1, The scene contrasts corresponding to the three image frames respectively are three scene contrasts of the first scene contrast, the second scene contrast and the third scene contrast.

Further, comparing the contrast ratio of the first scene with the contrast ratio of the second scene and the contrast ratio of the third scene respectively, there are many kinds of results obtained. Examples are as follows:

In a first example, the contrast of the first scene is smaller than the contrast of the second scene, and the contrast of the third scene is smaller than the contrast of the first scene.

Specifically, according to the above comparison results, it can be obtained that the scene contrast presents a downward trend as time goes by. In order to ensure the accuracy of the judgment, it is also necessary to determine that the downward trend of the scene contrast satisfies the preset threshold, so as to determine that the downward trend of the scene contrast is established, and thus the (K-1)th image frame is taken as the target image frame.

Fig. 3 is a schematic diagram of scene contrast according to an embodiment of the present application. As shown in FIG. 3 , it can be determined that the point A corresponding to the T-1th cycle time is the maximum value of scene contrast, which corresponds to the target image frame.

In a second example, the contrast of the first scene is smaller than the contrast of the second scene, and the contrast of the third scene is greater than the contrast of the first scene.

Specifically, according to the above comparison results, it can be obtained that the scene contrast presents a trend of decreasing and then increasing as time goes by. Thus, image frames cannot be directly targeted. Further analysis is required, as described in detail below:

Example 1: if the scene contrast of the subsequent acquired image frames is all lower than the second scene contrast, it means that the corresponding scene contrast may suddenly rise due to the influence of jitter at the moment of the T+1 period. Therefore, the scene contrast presents a downward trend, and the (K-1)th image frame is determined as the target image frame.

Fig. 4 is a schematic diagram of scene contrast according to another embodiment of the present application. As shown in FIG. 4 , it can be determined that the point A corresponding to the T-1th cycle time is the maximum value of scene contrast, which corresponds to the target image frame.

Example 2, if there is an image frame with a contrast greater than the second scene in the image frames acquired subsequently, it means that the scene contrast has not shown a downward trend, and it is necessary to determine the image frame with a contrast greater than the second scene as the target image frame.

Fig. 5 is a schematic diagram of scene contrast according to another embodiment of the present application. As shown in FIG. 5 , it can be determined that the point D corresponding to the period T+2 is the maximum value of scene contrast, which corresponds to the target image frame.

In a third example, the contrast of the first scene is greater than the contrast of the second scene, and the contrast of the third scene is smaller than the contrast of the first scene.

Specifically, the above comparison results cannot directly determine that the scene contrast presents a downward trend, which is an uncertain situation. Therefore, it is necessary to continue to obtain the scene contrast of the image frame at each cycle time, and re-acquire a new scene contrast to compare the obtained target image. frame.

Step 206, adjust the lens position accordingly according to the in-focus position of the target image frame.

It should be noted that the description of step S206 corresponds to the above-mentioned step S104, so for the description of step S206, refer to the description of the above-mentioned step S104, which will not be repeated here.

In the phase focusing method of the embodiment of the present application, firstly, during the phase focusing process, it is judged whether the difference of the phase detection data is less than the preset threshold value, and then the phase detection data difference is less than the threshold value, and then it is performed according to the preset frequency. Image acquisition, and obtain the scene contrast of each frame of image, then determine the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame of image, and finally adjust the lens position according to the in-focus position of the target image frame. Therefore, the accuracy of focusing can be ensured, and the speed of focusing can be improved.

In order to realize the above embodiments, the present application proposes a phase focusing device.

Fig. 6 is a schematic structural diagram of a phase focusing device according to an embodiment of the present application.

As shown in FIG. 6 , the phase focusing device of the embodiment of the present application includes: a judgment module 61 , a collection module 62 , an acquisition module 63 , a determination module 64 and an adjustment module 65 .

Wherein, the judging module 61 is used for judging whether the difference of the phase detection data is smaller than a preset threshold value during the phase focusing process.

The acquisition module 62 is configured to perform image acquisition according to a preset frequency when the difference of the phase detection data is less than a threshold value.

The obtaining module 63 is used to obtain the scene contrast of each frame of image.

The determination module 64 is configured to determine the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame of image.

The adjustment module 65 is used to adjust the lens position correspondingly according to the in-focus position of the target image frame.

Specifically, firstly, it is judged whether the difference of the phase detection data is smaller than a preset threshold value. When the difference of the phase detection data is less than the threshold value, it means that the in-focus position is very close, so that the image acquisition can be performed according to the preset frequency, and the scene contrast of each frame of image can be obtained.

The obtaining module 63 is used to obtain image processing data of each frame of image, and filter the image processing data according to a preset algorithm to obtain scene contrast of each frame of image.

The determination module 64 is used to compare the first scene contrast of the Kth image frame acquired at the T cycle time with the second scene contrast of the (K-1)th image frame acquired at the (T-1) cycle time, and the The third scene contrast of the (K+1)th image frame acquired at (T+1) cycle time is compared respectively;

If it is known that the contrast of the first scene is smaller than the contrast of the second scene, the contrast of the third scene is smaller than the contrast of the first scene, and the downward trend of scene contrast meets the preset threshold, then determine the (K-1)th image frame as the target image frame.

The determination module is also used to continue to detect the change trend of the scene contrast of subsequent captured image frames to determine the target image frame if it is known that the first scene contrast is less than the second scene contrast and the third scene contrast is greater than the first scene contrast.

The determining module is further configured to determine the (K-1)th image frame as the target image frame if the scene contrasts of the subsequently collected image frames are all smaller than the second scene contrast.

The determination module is further configured to determine that the image frame with a contrast greater than the second scene is the target image frame if there is an image frame with a contrast greater than the second scene in the subsequently collected image frames.

It should be noted that the foregoing explanations of the phase focusing method embodiment are also applicable to the phase focusing device of this embodiment, and its implementation principle is similar, so details are not repeated here.

In the phase focusing device of the embodiment of the present application, firstly, during the phase focusing process, it is judged whether the difference of the phase detection data is less than the preset threshold value, and then the phase detection data difference is smaller than the threshold value, and then the phase focusing is performed according to the preset frequency. Image acquisition, and obtain the scene contrast of each frame of image, then determine the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame of image, and finally adjust the lens position according to the in-focus position of the target image frame. Therefore, the accuracy of focusing can be ensured, and the speed of focusing can be improved.

Fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

7, terminal device 1000 may include one or more of the following components: processor 1001, memory 1002, power circuit 1003, multimedia component 1004, audio component 1005, input/output (I/O) interface 1006, sensor component 1007 , and a communication component 1008 .

The power supply circuit 1003 is used to supply power to various circuits or devices of the terminal device; the memory 1002 is used to store executable program codes; the processor 1001 reads the executable program codes stored in the memory 1002 to run the program to perform the following steps:

During the phase focusing process, it is judged whether the difference of the phase detection data is smaller than a preset threshold value.

If the difference of the phase detection data is less than the threshold value, image acquisition is performed according to a preset frequency, and the scene contrast of each frame of image is obtained.

The target image frame corresponding to the maximum value of the scene contrast is determined according to the scene contrast of each frame of image.

Adjust the lens position accordingly according to the in-focus position of the target image frame.

It should be noted that the foregoing explanations of the phase focusing method embodiment are also applicable to the terminal device of this embodiment, and its implementation principles are similar, so details are not repeated here.

The terminal device of the embodiment of the present application firstly determines whether the difference of the phase detection data is less than the preset threshold value during the phase focusing process, and then performs image processing according to the preset frequency when the difference of the phase detection data is less than the threshold value. Collect and obtain the scene contrast of each frame of image, then determine the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame of image, and finally adjust the lens position correspondingly according to the in-focus position of the target image frame. Therefore, the accuracy of focusing can be ensured, and the speed of focusing can be improved.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations on the present application, and those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (11)

1. A phase focusing method, is characterized in that, comprises the following steps: During the phase focusing process, it is judged whether the difference of the phase detection data is smaller than a preset threshold value; If the difference of the phase detection data is less than the threshold value, image acquisition is performed according to a preset frequency, and the scene contrast of each frame of image is acquired; Determine the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame of image; The lens position is adjusted accordingly according to the in-focus position of the target image frame. 2. The method according to claim 1, wherein said obtaining the scene contrast of each frame image comprises: Obtain the image processing data of each frame of image; Filtering is performed on the image processing data according to a preset algorithm to obtain the scene contrast of each frame of image. 3. The method according to claim 1, wherein the determination of the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame image comprises: The first scene contrast of the Kth image frame acquired at the T cycle time and the second scene contrast of the (K-1)th image frame acquired at the (T-1) cycle time, and the contrast at (T+1 ) The third scene contrast of the (K+1)th image frame acquired at the cycle time is compared respectively; If it is known that the contrast of the first scene is smaller than the contrast of the second scene, the contrast of the third scene is smaller than the contrast of the first scene, and the downward trend of the contrast of the scene satisfies the preset threshold, then determine the (K-1)th image frames are the target image frames. 4. The method according to claim 3, wherein said determination of the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame image further comprises: If it is known that the first scene contrast is less than the second scene contrast, and the third scene contrast is greater than the first scene contrast, then continue to detect the change trend of the scene contrast of the image frames subsequently collected to determine the target image frame. 5. The method according to claim 4, wherein the continuous detection of the change trend of the scene contrast of the subsequent image frames collected, to determine the target image frame, comprises: If the scene contrast of the subsequent image frames collected is less than the second scene contrast, then determine the (K-1)th image frame as the target image frame; If there is an image frame with a contrast greater than the second scene in the subsequently acquired image frames, determine that the image frame with a contrast greater than the second scene is the target image frame. 6. A phase focusing device, characterized in that it comprises: A judging module, configured to judge whether the difference of the phase detection data is less than a preset threshold value during the phase focusing process; An acquisition module, configured to perform image acquisition according to a preset frequency when the difference of the phase detection data is less than the threshold value; An acquisition module, configured to acquire the scene contrast of each frame of image; A determining module, configured to determine the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame of image; The adjustment module is configured to adjust the lens position correspondingly according to the in-focus position of the target image frame. 7. The device according to claim 6, wherein the acquisition module is used for: Obtain the image processing data of each frame of image; Filtering is performed on the image processing data according to a preset algorithm to obtain the scene contrast of each frame of image. 8. The device according to claim 6, wherein the determination module is used for: The first scene contrast of the Kth image frame acquired at the T cycle time and the second scene contrast of the (K-1)th image frame acquired at the (T-1) cycle time, and the contrast at (T+1 ) The third scene contrast of the (K+1)th image frame acquired at the cycle time is compared respectively; If it is known that the contrast of the first scene is smaller than the contrast of the second scene, the contrast of the third scene is smaller than the contrast of the first scene, and the downward trend of the contrast of the scene satisfies the preset threshold, then determine the (K-1)th image frames are the target image frames. 9. The device according to claim 8, wherein the determining module is further configured to: If it is known that the first scene contrast is less than the second scene contrast, and the third scene contrast is greater than the first scene contrast, then continue to detect the change trend of the scene contrast of the image frames subsequently collected to determine the target image frame. 10. The device according to claim 9, wherein the determination module is further used for: If the scene contrast of the subsequent image frames collected is less than the second scene contrast, then determine the (K-1)th image frame as the target image frame; If there is an image frame with a contrast greater than the second scene in the subsequently acquired image frames, determine that the image frame with a contrast greater than the second scene is the target image frame. 11. A terminal device, characterized by comprising: a housing, a processor, a memory, a circuit board, and a power supply circuit, wherein the circuit board is placed inside the space enclosed by the housing, and the processor and The memory is set on the circuit board; the power supply circuit is used to supply power to each circuit or device of the terminal equipment; the memory is used to store executable program code; the processor reads the The stored executable program code is used to run a program corresponding to the executable program code for performing the following steps: During the phase focusing process, it is judged whether the difference of the phase detection data is smaller than a preset threshold value; If the difference of the phase detection data is less than the threshold value, image acquisition is performed according to a preset frequency, and the scene contrast of each frame of image is acquired; Determine the target image frame corresponding to the maximum value of the scene contrast according to the scene contrast of each frame of image; The lens position is adjusted accordingly according to the in-focus position of the target image frame.