CN111767098A - Method and apparatus for adjusting font size - Google Patents

Abstract

The embodiments of the present application disclose a method and an apparatus for adjusting font size. A specific implementation of the method includes: acquiring a picture including the user's face to determine the width of the face in the acquired picture; in response to the ratio of the determined face width to the preset initial face width being greater than the width ratio Threshold, according to the ratio and the initial value of the font size, adjust the font size displayed on the screen. The method can dynamically adjust the font size displayed on the screen by judging the change of the distance between the terminal and the face.

Description

Method and apparatus for adjusting font size

technical field

The embodiments of the present application relate to the field of computer technologies, and in particular, to a method and apparatus for adjusting font size.

Background technique

With the development of the mobile Internet and the popularization of mobile smart terminals, it is more and more common for people to use apps (Applications) for browsing news or shopping. The font settings of the currently used apps are usually set to fixed values. The distance of the screen dynamically sets the font size on demand.

SUMMARY OF THE INVENTION

The embodiments of the present application propose a method and apparatus for adjusting font size.

In a first aspect, an embodiment of the present application provides a method for adjusting font size, the method includes: acquiring a picture including a user's face to determine the width of the face in the acquired picture; responding to the determined face If the ratio of the face width to the preset initial face width is greater than the width ratio threshold, the font size displayed on the screen is adjusted according to the above ratio and the initial value of the font size.

In some embodiments, the above-mentioned initial face width and the above-mentioned initial value of the font size are obtained by the following steps: detecting the face width in the acquired picture at the current sampling moment; in response to detecting the face in the acquired picture The variation range of the width within the second preset duration is less than the preset width variation threshold, the width of the face in the acquired picture is determined as the initial width, and the value of the font size displayed on the above-mentioned screen at the above-mentioned current sampling moment is taken as Font size initial value.

In some embodiments, the above-mentioned determining the width of the face in the acquired picture includes: performing face recognition on the acquired picture, and using the width of the recognized face recognition frame as the width of the face of the acquired picture .

In some embodiments, the above-mentioned acquiring a picture including the user's face to determine the width of the face in the acquired picture includes: acquiring a picture including the user's face with a first preset duration as a period to determine the acquired The width of the face in the picture.

In some embodiments, obtaining a picture including the user's face to determine the width of the face in the obtained picture includes: capturing the picture in front of the screen, identifying whether there is a face in the picture; If there is a face, a picture including the face is acquired with a first preset duration as a period to determine the width of the face in the acquired picture.

In a second aspect, an embodiment of the present application provides an apparatus for adjusting a font size, the apparatus comprising: an acquisition unit configured to acquire a picture including a user's face, so as to determine the width of the face in the acquired picture; The adjustment unit is configured to adjust the font size displayed on the screen according to the ratio and the initial value of the font size in response to the ratio of the determined face width to the preset initial face width being greater than the width ratio threshold.

In some embodiments, the above-mentioned initial face width and the above-mentioned initial value of the font size are obtained by the following steps: detecting the face width in the acquired picture at the current sampling moment; in response to detecting the face in the acquired picture The variation range of the width within the second preset duration is less than the preset width variation threshold, the width of the face in the acquired picture is determined as the initial width, and the value of the font size displayed on the above-mentioned screen at the above-mentioned current sampling moment is taken as Font size initial value.

In some embodiments, the above-mentioned determining the width of the face in the acquired picture includes: performing face recognition on the acquired picture, and using the width of the recognized face recognition frame as the width of the face of the acquired picture .

In some embodiments, the obtaining unit is further configured to: obtain a picture including the user's face in a period of a first preset duration to determine the width of the face in the obtained picture.

In some embodiments, the obtaining unit is further configured to: capture the picture in front of the above-mentioned screen, and identify whether there is a face in the picture; in response to recognizing that there is a face in the picture, obtain a first preset period of time that includes the person A picture of the face to determine the width of the face in the acquired picture.

In a third aspect, an embodiment of the present application provides a server, including: one or more processors; a storage device on which one or more programs are stored, and when the one or more programs are executed by the one or more processors , causing one or more processors to implement the method of any one of the embodiments of the method for resizing a font.

In a fourth aspect, an embodiment of the present application provides a computer-readable medium on which a computer program is stored, and when the program is executed by a processor, implements the method in any one of the embodiments of the method for adjusting font size.

In the method and device for adjusting font size provided by the embodiments of the present application, first, a picture including the user's face is acquired to determine the width of the face in the acquired picture; If the ratio of the set initial face width is greater than the width ratio threshold, the font size displayed on the screen is adjusted according to the above ratio and the initial value of the font size. The method for adjusting the font size can determine the change ratio of the distance between the face and the terminal screen according to the change of the width of the face, so as to achieve the effect of dynamically adjusting the font size displayed on the screen.

Description of drawings

Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

FIG. 1 is an exemplary system architecture diagram to which an embodiment of the present application may be applied;

2 is a flowchart of one embodiment of a method for adjusting font size according to the present application;

2-1 is a face recognition diagram of one embodiment of a method for adjusting font size according to the present application;

2-2 is a schematic diagram of one embodiment of a method for adjusting font size according to the present application;

3 is a schematic diagram of an application scenario of the method for adjusting font size according to an embodiment of the present application;

Figure 4 is a flowchart of yet another embodiment of a method for adjusting font size according to the present application;

5 is a schematic structural diagram of an embodiment of an apparatus for adjusting font size according to the present application;

FIG. 6 is a schematic structural diagram of a computer system suitable for implementing the server of the embodiment of the present application.

Detailed ways

The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the related invention, but not to limit the invention. In addition, it should be noted that, for the convenience of description, only the parts related to the related invention are shown in the drawings.

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

FIG. 1 illustrates an exemplary system architecture 100 to which the method for adjusting font size or the apparatus for adjusting font size of the present application may be applied.

As shown in FIG. 1, the system architecture 100 may include a user 101, a terminal device 102 for adjusting font size.

The user can browse text and the like through the screen installed on the terminal device 102 . Various applications for browsing text may be installed on the terminal device 102 , such as browser applications, shopping applications, social platform software, and the like.

The terminal device 102 may be hardware or software. When the terminal device 102 is hardware, it can be various electronic devices having a display screen and supporting picture browsing, including but not limited to smart phones, tablet computers, laptop computers, desktop computers, and the like. When the terminal device 102 is software, it can be installed in the electronic devices listed above. It can be implemented as multiple software or software modules (eg, to provide distributed services), or as a single software or software module. There is no specific limitation here.

It should be noted that, the method for adjusting the font size provided by the embodiment of the present application is usually performed by the terminal device 102 . Accordingly, the means for adjusting the font size is usually provided in the terminal device 102 .

It should be understood that the number of terminal devices 102 in FIG. 1 is merely illustrative. There can be any number of terminal devices according to implementation needs.

With continued reference to FIG. 2, a flow 200 of one embodiment of a method for adjusting font size according to the present application is shown. The method for adjusting font size includes the following steps:

Step 201: Acquire a picture including the user's face to determine the width of the face in the acquired picture.

In this embodiment, the execution body of the method for adjusting the font size (for example, the terminal device 102 shown in FIG. 1 ) can usually present information such as text through a screen installed on the execution body. When the user is reading the text information on the above-mentioned screen, the above-mentioned execution body can take a picture of the user through a camera installed on the execution body, or can take a picture of the user through a camera that is communicatively connected to the execution body, and can also use Other specified ways to obtain a picture including the user's face. The width of the face in the above picture can be determined by means of face recognition. Specifically, the face area in the picture can be identified first, and then the identified face area can be cut out by using the face recognition frame, and the width of the face recognition frame can be determined as the width of the face in the above picture, as shown in the figure 2-1.

Step 202, in response to the ratio of the determined face width to the preset initial face width being greater than the preset width ratio threshold, adjust the font size displayed on the screen according to the ratio and the initial value of the font size.

In this embodiment, the width ratio threshold may be set according to actual needs, and the specific value is not limited. The font size presented on the screen can be adjusted to the above-mentioned expected font size by dividing the initial value of the font by the ratio to obtain the expected value of the adjusted font size.

In this embodiment, the ratio of the distance between the user and the screen to the initial distance can be determined by the ratio of the face width to the preset initial face width, where the initial distance refers to the distance between the user and the screen at the moment of the initial face width. the distance. The specific principle is the pinhole model shown in Figure 2-2, f is the focal length of the camera, c is the optical center of the lens, the light emitted by the object passes through the optical center of the camera, and then is imaged on the image sensor or image plane, Assuming that the distance between the plane where the object is located and the camera plane is d, the actual height of the object is H, and the height on the sensor is h, then there is such a relationship: f/d=h/H, where / represents the division symbol. Since f and H are unchanged, the relationship between the distance d1 and the height h1 after the position change is consistent with: d1/d=h1/h, so that the width h of the face on the terminal screen before the position change and the position after the change can be determined according to the According to the ratio of the width h1 of the face on the terminal screen, the ratio p=h1/h of the movement of the face from the screen is calculated. That is, the ratio of the distance change between the face and the screen can be obtained by the ratio of the face width to the preset initial face width, so that the font size displayed on the screen can be adjusted according to the above ratio. Optionally, if the above ratio is greater than a preset threshold (for example, 1.05), the font size is enlarged to 1.05 times the initial value of the font size.

In some optional implementations of this embodiment, the above-mentioned initial face width and the above-mentioned initial value of the font size may be obtained by the following steps: detecting the face width in the obtained picture at the current sampling moment, and responding to the detection The variation range of the width of the face in the acquired picture within the second preset duration is smaller than the preset width variation threshold, and the width of the face in the acquired picture is determined as the initial width. The value of the font size displayed on the above-mentioned screen at the above-mentioned current sampling time is taken as the initial value of the font size. The above-mentioned second preset duration may be set according to actual needs, which is not limited in this application, and may be, for example, 10 seconds. The above-mentioned preset width change threshold may be set according to actual needs, which is not limited in this application, and may be, for example, 0.08. For example, the width of the user's face is detected with a period of 2 seconds, and it is detected that the variation of the width of the face within 10 seconds is less than 0.08, that is, the variation has the following relationship: |x2-x1|<0.08, where x1 represents 2 seconds The face width before, x2 represents the face width after 2 seconds, || represents the absolute value sign, and |x2-x1| represents the change range of the face width before and after 2 seconds. This means that the user is in a state where the position of the user has little change from the screen within 10 seconds, that is, the size of the text on the screen is suitable for the position of the current user. Therefore, the detected face width can be determined as the initial width, and the value of the font size displayed on the screen at the above-mentioned current sampling moment is used as the initial value of the font size. The initial value of the initial width and font size corresponds to the state that the user is in when reading the text on the screen more comfortably.

Continue to refer to FIG. 3 , which is a schematic diagram of an application scenario of the method for adjusting font size according to this embodiment. In the application scenario of FIG. 3 , a screen and a camera are installed on the terminal 301 for adjusting the font size, and text is displayed on the screen. A picture including the face of the user 302 is obtained through the camera, and the face width a is determined from the picture. In response to the ratio of the determined face width a to the preset initial face width b is greater than the width ratio threshold of 1.05, the result obtained by multiplying the above ratio by the initial value m of the font size is taken as the target font size x, and the screen is displayed on the screen. The font size is adjusted to the target font size x.

In this embodiment, the initial face width b and the initial value m of the font size are obtained through the following steps: detecting the user's face width with a cycle of 2 seconds, detecting that the change range of the face width within 10 seconds is less than 0.05, and using The detected face width is determined as the initial width, and the value of the font size displayed on the screen at the above-mentioned current sampling moment is used as the initial value of the font size. The initial value of the initial width and font size corresponds to the state that the user is in when reading the text on the screen more comfortably.

The method provided by the above embodiments of the present application achieves the effect of dynamically adjusting the font size displayed on the screen by determining the change ratio of the distance between the face and the terminal screen according to the change in the width of the face. Compared with the usual fixed font size adjustment, when the user's distance from the screen changes, the user cannot see the text content clearly. In the prior art, there is a need to automatically adjust the font size according to the distance. The method provided by the above embodiments of the present application can automatically adjust the font size according to the distance.

With further reference to FIG. 4, a flow 400 of yet another embodiment of a method for adjusting font size is shown. The process 400 of the method for adjusting font size includes the following steps:

Step 401, obtaining a picture including the user's face with the first preset duration as a period, so as to perform face recognition on the obtained picture, and use the width of the recognized face recognition frame as the face width of the obtained picture. .

In this embodiment, the first preset duration may be set according to actual needs, which is not limited in this application, for example, the first preset duration may be 2 seconds. The execution body of the method for adjusting the font size (for example, the terminal device 102 shown in FIG. 1 ) can usually present information such as text through a screen installed on the execution body. When the user is reading the text information on the above-mentioned screen, the above-mentioned execution body can take a picture of the user through a camera installed on the execution body, or can take a picture of the user through a camera that is communicatively connected to the execution body, and can also use Other specified ways to obtain a picture including the user's face. Optionally, the width of the face in the above picture may be determined by means of face recognition. Specifically, the face in the picture may be identified, and then the identified face may be cut out through the face identification frame, and the width of the face identification frame may be determined as the width of the face in the above picture. The above face recognition frame can be various shapes according to actual needs, such as a square (as shown in Figure 2-1).

Step 402, in response to the ratio of the determined face width to the preset initial face width being greater than the width ratio threshold, adjust the font size displayed on the screen according to the ratio and the initial value of the font size.

In this embodiment, the specific operation of step 402 is basically the same as the operation of step 202 in the embodiment shown in FIG. 2 , and details are not repeated here.

In some optional implementations of this embodiment, the above-mentioned determining the width of the face in the acquired picture includes: performing face recognition on the acquired picture, and using the width of the recognized face recognition frame as the The width of the face of the acquired image.

In some optional implementations of this embodiment, the above-mentioned initial face width and the above-mentioned initial value of the font size are obtained by the following steps: detecting the face width in the obtained picture at the current sampling moment; The variation range of the width of the face in the acquired picture within the second preset duration is less than the preset width variation threshold, the width of the face in the acquired picture is determined as the initial width, and the above-mentioned screen at the current sampling moment is determined as the initial width. The value of the rendered font size is used as the font size initial value.

In some optional implementations of this embodiment, obtaining a picture including the user's face to determine the width of the face in the obtained picture includes: capturing the picture in front of the screen, and identifying whether there is a face in the picture ; In response to recognizing that there is a face in the picture, acquiring a picture including the human face with a first preset duration as a period to determine the width of the face in the acquired picture.

As can be seen from FIG. 4 , compared with the embodiment corresponding to FIG. 2 , the process 400 of the method for adjusting the font size in this embodiment highlights the acquisition of a picture including the user's face with the first preset duration as a period , and the steps of performing face recognition on the acquired picture, and taking the width of the recognized face recognition frame as the face width of the acquired picture. Detecting the width of the face with a certain period of time can be set more flexibly to adjust the frequency of fonts, so as to avoid the negative effect of flickering caused by excessive frequency to users. This method performs face recognition, and uses the width of the face recognition frame as the face width, so that the face width can be obtained more uniformly. When the distance between the user's face and the screen changes, it helps to improve the accuracy of the calculation of the face width change ratio.

Further referring to FIG. 5 , as an implementation of the methods shown in the above figures, the present application provides an embodiment of an apparatus for adjusting font size, and the apparatus embodiment corresponds to the method embodiment shown in FIG. 2 , Specifically, the device can be applied to various electronic devices.

The apparatus 500 for adjusting the font size of this embodiment includes: an obtaining unit 501 and an adjusting unit 502 . The acquiring unit 501 is configured to acquire a picture including the user's face to determine the width of the face in the acquired picture; the adjusting unit 502 is configured to respond to the determined face width and a preset initial face width The ratio is greater than the width ratio threshold, and the font size displayed on the screen is adjusted according to the above ratio and the initial value of the font size.

In this embodiment, the above-mentioned initial face width and the above-mentioned initial value of the font size are obtained by the following steps: detecting the face width in the acquired picture at the current sampling moment; in response to detecting the face in the acquired picture The variation range of the width within the second preset duration is less than the preset width variation threshold, the width of the face in the acquired picture is determined as the initial width, and the value of the font size displayed on the above-mentioned screen at the above-mentioned current sampling moment is taken as Font size initial value.

In some optional implementations of this embodiment, the above-mentioned determining the width of the face in the acquired picture includes: performing face recognition on the acquired picture, and using the width of the recognized face recognition frame as the The width of the face of the acquired image.

In some optional implementations of this embodiment, the above-mentioned obtaining unit is further configured to: obtain a picture including the user's face with a first preset duration as a period, so as to determine the width of the face in the obtained picture.

In some optional implementations of this embodiment, the above-mentioned obtaining unit is further configured to: capture the picture in front of the above-mentioned screen, and identify whether there is a face in the picture; in response to identifying a face in the picture, use the first preset A picture including the face is acquired periodically for a period of time to determine the width of the face in the acquired picture.

Referring to FIG. 6 below, it shows a schematic structural diagram of a computer system 600 suitable for implementing the electronic device of the embodiment of the present application. The electronic device shown in FIG. 6 is only an example, and should not impose any limitations on the functions and scope of use of the embodiments of the present application.

As shown in FIG. 6, a computer system 600 includes a central processing unit (CPU) 601, which can be loaded into a random access memory (RAM) 603 according to a program stored in a read only memory (ROM) 602 or a program from a storage section 608 Instead, various appropriate actions and processes are performed. In the RAM 603, various programs and data necessary for the operation of the system 600 are also stored. The CPU 601 , the ROM 602 , and the RAM 603 are connected to each other through a bus 604 . An input/output (I/O) interface 605 is also connected to bus 604 .

The following components are connected to the I/O interface 605: an input section 606 including a camera, etc.; an output section 607 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 608 including a hard disk, etc.; and The communication section 609 includes a network interface card such as a LAN card, a modem, and the like. The communication section 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to the I/O interface 605 as needed. A removable medium 611, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is mounted on the drive 610 as needed so that a computer program read therefrom is installed into the storage section 608 as needed.

In particular, according to embodiments of the present disclosure, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the method illustrated in the flowchart. In such an embodiment, the computer program may be downloaded and installed from the network via the communication portion 609 and/or installed from the removable medium 611 . When the computer program is executed by the central processing unit (CPU) 601, the above-described functions defined in the method of the present application are performed.

It should be noted that the computer-readable medium mentioned above in the present application may be a computer-readable signal medium or a computer-readable storage medium, or any combination of the above two. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or a combination of any of the above. More specific examples of computer readable storage media may include, but are not limited to, electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read only memory (ROM), erasable Programmable read only memory (EPROM or flash memory), fiber optics, portable compact disk read only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing. In this application, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this application, however, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code therein. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device . Program code embodied on a computer readable medium may be transmitted using any suitable medium including, but not limited to, wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

Computer program code for performing the operations of the present application may be written in one or more programming languages, including object-oriented programming languages—such as Java, Smalltalk, C++, but also conventional Procedural programming language - such as the "C" language or similar programming language. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer, or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (eg, using an Internet service provider through Internet connection).

The flowchart and block diagrams in the Figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code that contains one or more logical functions for implementing the specified functions executable instructions. It should also be noted that, in some alternative implementations, the functions noted in the blocks may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It is also noted that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented in dedicated hardware-based systems that perform the specified functions or operations , or can be implemented in a combination of dedicated hardware and computer instructions.

The units involved in the embodiments of the present application may be implemented in a software manner, and may also be implemented in a hardware manner. The described unit can also be provided in the processor, for example, it can be described as: a processor includes an acquisition unit and an adjustment unit. Wherein, the names of these units do not constitute a limitation of the unit itself in some cases, for example, the acquiring unit may also be described as "a unit that acquires a picture including a user's face".

As another aspect, the present application also provides a computer-readable medium, which may be included in the apparatus described in the above-mentioned embodiments, or may exist independently without being assembled into the apparatus. The above-mentioned computer-readable medium carries one or more programs, and when the above-mentioned one or more programs are executed by the device, the device causes the device to: acquire a picture including the user's face, so as to determine the width of the face in the acquired picture; In response to the ratio of the determined face width to the preset initial face width being greater than the width ratio threshold, the font size displayed on the screen is adjusted according to the above ratio and the initial value of the font size.

The above description is only a preferred embodiment of the present application and an illustration of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover the above technical features or Other technical solutions formed by any combination of its equivalent features. For example, a technical solution is formed by replacing the above features with the technical features disclosed in this application (but not limited to) with similar functions.

Claims (12)

1. A method for adjusting font size, comprising: Obtain a picture including the user's face to determine the width of the face in the obtained picture; In response to the ratio of the determined face width to the preset initial face width being greater than the width ratio threshold, the font size presented on the screen is adjusted according to the ratio and the initial value of the font size. 2. The method of claim 1, wherein the initial face width and the initial value of the font size are obtained by: Detect the width of the face in the acquired picture at the current sampling moment; In response to detecting that the variation range of the width of the face in the acquired picture within the second preset duration is less than the preset width variation threshold, determining the width of the face in the acquired picture as the initial width, and setting the current sampling At the moment, the value of the font size displayed on the screen is used as the initial value of the font size. 3. The method according to claim 1, wherein the determining the width of the face in the acquired picture comprises: Perform face recognition on the acquired picture, and use the width of the recognized face recognition frame as the face width of the acquired picture. 4. The method according to claim 1, wherein the obtaining a picture including the user's face to determine the width of the face in the obtained picture comprises: A picture including the user's face is acquired in a period of the first preset duration to determine the width of the face in the acquired picture. 5. The method according to one of claims 1-4, wherein the obtaining a picture including the user's face to determine the width of the face in the obtained picture comprises: Capture the picture in front of the screen, and identify whether there is a face in the picture; In response to recognizing that there is a face in the picture, a picture including the face is acquired in a period of a first preset duration to determine the width of the face in the acquired picture. 6. An apparatus for adjusting font size, comprising: an acquiring unit, configured to acquire a picture including the user's face, to determine the width of the face in the acquired picture; The adjustment unit is configured to adjust the font size presented on the screen according to the ratio and the initial value of the font size in response to the ratio of the determined face width to the preset initial face width being greater than the width ratio threshold. 7. The apparatus of claim 6, wherein the initial face width and the initial value of the font size are obtained by: Detect the width of the face in the acquired picture at the current sampling moment; In response to detecting that the variation range of the width of the face in the acquired picture within the second preset duration is less than the preset width variation threshold, determining the width of the face in the acquired picture as the initial width, and setting the current sampling At the moment, the value of the font size displayed on the screen is used as the initial value of the font size. 8. The apparatus according to claim 7, wherein the determining the width of the face in the acquired picture comprises: Perform face recognition on the acquired picture, and use the width of the recognized face recognition frame as the face width of the acquired picture. 9. The apparatus of claim 6, wherein the obtaining unit is further configured to: A picture including the user's face is acquired in a period of the first preset duration to determine the width of the face in the acquired picture. 10. The apparatus of one of claims 6-9, wherein the acquisition unit is further configured to: Capture the picture in front of the screen, and identify whether there is a face in the picture; In response to recognizing that there is a face in the picture, a picture including the face is acquired in a period of a first preset duration to determine the width of the face in the acquired picture. 11. A server comprising: one or more processors; a storage device on which one or more programs are stored, The one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of any one of claims 1-5. 12. A computer-readable medium having stored thereon a computer program, wherein the program, when executed by a processor, implements the method of any one of claims 1-5.

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