CN106954004A - Screen sharing method and device - Google Patents

Abstract

The present invention discloses a method and device for screen sharing, which relates to the field of communication technology, in order to solve the problem that the real-time and smoothness of screen sharing cannot be guaranteed. The method comprises: dividing the current frame image and the next frame image into the same number of corresponding meta-images, wherein the number of pixels contained in each meta-image in the current frame image is the same as the number of pixels contained in each meta-image in the next frame image and corresponds to each other; selecting a second preset number of pixel detection points in each meta-image of the current frame image, and the pixel points in the next frame image corresponding to the pixel detection points are target pixel points; calculating the pixel change amount between each pixel detection point and the corresponding target pixel point; if the pixel change amount is greater than a threshold value, sending the meta-image to which the target pixel point whose pixel change amount is greater than the threshold value belongs to to a data synchronization screen. The scheme provided by the present invention is suitable for use in screen sharing.

Description

Method and device for screen sharing

technical field

The present invention relates to the technical field of communication networks, in particular to a screen sharing method and device.

Background technique

Using the screen sharing technology, it is possible to realize the transmission of digital multimedia and other content (such as video content) between multiple screens, and to synchronize the display content of different screens. At present, the commonly used scheme of screen sharing is: intercept the current frame and the next frame of the screen image of the terminal, and scan each pixel of the current frame of the screen image and the next frame of the screen image (each frame of the screen image is composed of pixels ), calculate the three primary colors (Red, Green, Blue, hereinafter referred to as RGB) value of each pixel point, if the pixel point of the next frame screen image changes in RGB value relative to the pixel point of the current frame screen image, then RGB will occur The image composed of pixels with changing values is sent to another screen of the terminal, or to the screens of other terminals, so that the image data is shared from one screen to another.

However, in the above screen sharing solution, the terminal needs to calculate the RGB value of each pixel of the screen image, and each screen image contains a large number of pixels, so the calculation amount is relatively large, which greatly consumes the computing resources of the terminal , which slows down the running speed of the terminal, thereby slowing down the speed at which the terminal transmits image data, and cannot guarantee the real-time and fluency of screen sharing.

Contents of the invention

Embodiments of the present invention provide a method and device for screen sharing, which are used to ensure the real-time performance and fluency of screen sharing.

To achieve the above object, the present invention adopts the following technical solutions:

A method of screen sharing, comprising:

The current frame image and the next frame image are respectively divided into the same number of element images corresponding to each other, wherein, the number of pixels contained in each element image in the current frame image and the number of pixels contained in each element image in the next frame image The images contain the same number of pixels and are in one-to-one correspondence, and each element image contains a first preset number of pixels;

A second preset number of pixel detection points are respectively selected in each element image of the current frame image, and the pixel points in the next frame image corresponding to the pixel detection points are target pixel points, wherein the first 2. The preset quantity is smaller than the first preset quantity;

Calculate the amount of pixel change between each pixel detection point and its corresponding target pixel point;

If the pixel change amount is greater than the threshold value, the original image to which the target pixel point whose pixel change amount is greater than the threshold value belongs to is sent to the data synchronization screen.

A device for screen sharing, comprising:

A division unit, configured to divide the current frame image and the next frame image into the same number of meta-images corresponding to one-to-one, wherein the number of pixels contained in each meta-image in the current frame image is the same as that of the next frame Each meta-image in the image contains the same number of pixels and one-to-one correspondence, and each meta-image respectively contains a first preset number of pixels;

A selection unit, configured to select a second preset number of pixel detection points in each element image divided by the division unit of the current frame image, and the pixel detection points corresponding to the pixel detection points in the next frame image The pixel point is a target pixel point, wherein the second preset number is smaller than the first preset number;

A calculation unit, configured to calculate the amount of pixel variation between each pixel detection point selected by the selection unit and its corresponding target pixel;

The sending unit is configured to send the meta image to which the target pixel whose pixel change amount is greater than the threshold belongs to the data synchronization screen if the pixel change amount calculated by the calculation unit is greater than the threshold value.

The method and device for screen sharing provided by the embodiments of the present invention divide the current frame image and the next frame image into the same number of meta-images with one-to-one correspondence, wherein the number of pixels contained in each meta-image in the current frame image The number of pixels contained in each element image in the next frame image is the same and one-to-one correspondence, and then further in each element image of the current frame image, respectively select a second preset number of pixel detection points, wherein, with the The pixel point in the next frame image corresponding to the selected pixel detection point is used as the target pixel point, so that only the pixel change amount of a part of the pixel point in the screen image can be calculated, and it can be determined whether the next frame image is relative to the current frame image. Changes have taken place. Compared with the calculation of the pixel changes of all pixels of the screen image in the prior art, the amount of calculation is reduced. Therefore, the speed of terminal operation is improved, and the speed of terminal image data transmission is accelerated, ensuring that the screen Real-time and fluency of sharing.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a flowchart of a screen sharing method provided by an embodiment of the present invention;

Fig. 2a is an exemplary schematic diagram of the division of the primary image in the current frame image provided by the embodiment of the present invention;

Fig. 2b is an exemplary schematic diagram of the division of the meta-image in the next frame image provided by the embodiment of the present invention;

Fig. 2c is an exemplary schematic diagram of a selected pixel detection point provided by an embodiment of the present invention;

FIG. 3 is a flow chart of another screen sharing method provided by an embodiment of the present invention;

FIG. 4 is a flow chart of another screen sharing method provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of a logical structure of a screen sharing device provided by an embodiment of the present invention;

FIG. 6 is a schematic diagram of a logical structure of a terminal provided by an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In order to solve the problem that the real-time and fluency of screen sharing cannot be guaranteed, an embodiment of the present invention provides a method for screen sharing, as shown in FIG. 1 , the method includes:

Step 101. Divide the current frame image and the next frame image into the same number of element images corresponding to each other, wherein the number of pixels contained in each element image in the current frame image and the number of pixels contained in each element image in the next frame image The included pixels have the same number and one-to-one correspondence, and each element image includes a first preset number of pixels.

For example, Fig. 2a shows the element image divided in the current frame image, and Fig. 2b shows the element image divided in the next frame image. Wherein, the part circled by the dotted line box represents a meta-image. It can be seen from Fig. 2a and Fig. 2b that both the current frame image and the next frame image are divided into 9 meta-images, each meta-image contains 9 pixels, and each pixel corresponds to a coordinate.

Step 102: Select a second preset number of pixel detection points in each element image of the current frame image, and the pixel points in the next frame image corresponding to the pixel detection points are the target pixel points, wherein the second preset number The quantity is less than the first preset quantity.

It should be emphasized that the second preset quantity selected in each meta image may be the same or different. For example, in the current frame image shown in Figure 2a, in the order from left to right and from top to bottom, select 2 pixel detection points from the first meta-image, and select 3 pixel detection points from the second meta-image Pixel detection points.

Step 102 is described here in conjunction with Fig. 2a and Fig. 2b. It is worth noting that the pixels marked black in Fig. 2a are selected pixel detection points, and the pixels marked black in Fig. 2b are pixel detection points corresponding to target pixel. In Figure 2a, in the order from left to right and from top to bottom, in the first meta-image, the terminal selects two pixel points with coordinates (0,1) and (2,0) as pixel detection points, Then in the next frame of image shown in Figure 2b, the coordinates of the pixel corresponding to the pixel detection point are (0,1), (2,0), therefore, the coordinates are (0,1), (2,0) The pixel point is taken as the target pixel point. In the second element image of the current frame image shown in Figure 2a, the terminal selects three pixel detection points, then in the second element image of the next frame image shown in Figure 2b, the selected three pixels The pixel corresponding to the detection point is used as the target detection point.

It should be noted that, in the embodiment of the present invention, in order to increase the speed of pixel detection, in each element image of the current frame image, the number of selected pixel detection points should be smaller than the number of pixels contained in each element image, that is, The second preset number is less than the first preset number. For example, as shown in FIG. 2a, the first preset number is 9. Therefore, the number of pixel detection points selected in each element image should be less than 9.

It should also be noted that in step 102, the method of selecting pixel detection points can be random selection. In addition, in order to make the selected pixel detection points more representative, in the embodiment of the present invention, an edge detection algorithm can also be used Extract the pixels in the current frame image that can describe the basic outline of the entire image, and use the extracted pixels as pixel detection points. For example, the current frame image shown in Figure 2c is a "day" word image, as can be seen from Figure 2c, the pixels contained in the dotted frame can describe the basic outline of the entire "day" word image, therefore, when selecting pixels When , the pixels contained in the dotted frame are selected first. For example, in the order from left to right and from top to bottom, in the first meta-image, select the pixel with coordinates (2,2) as the pixel detection point, and in the second meta-image, select The pixel points with coordinates (2,3) and (2,5) are used as pixel detection points, and in the sixth element image, the pixel points with coordinates (4,6) are selected as pixel detection points.

Step 103 , calculating the pixel change amount between each pixel detection point and its corresponding target pixel point.

Wherein, the amount of pixel change is used to describe whether the pixels of the next frame image have changed relative to the pixels of the current frame image or to describe the change degree of the pixels of the next frame image relative to the pixels of the current frame image. The amount of pixel change will be described below in conjunction with Figure 2a and Figure 2b. In the current frame image shown in Figure 2a, the RGB value of pixel point A with coordinates (0,0) is #FF0021, and the value shown in Figure 2b is In a frame of image, the RGB value of the pixel A1 whose coordinates are (0,0) is #FF0000, then the pixel change amount can be used to describe the degree of change of the RGB value of the pixel A1 relative to the pixel A.

Step 104, if the pixel variation is greater than the threshold, send the meta image to which the target pixel whose pixel variation is greater than the threshold belongs to the data synchronization screen.

Wherein, the data synchronization screen may be a screen other than the main screen of the terminal, or the data synchronization screen may be a screen of another terminal.

Now, step 104 will be described in conjunction with the example in step 103. Assume that the threshold is #000010. If the difference between pixel RGB values is used to represent the pixel variation, then the pixel variation between pixel A and pixel A1 is #FF0021 -#FF0000, that is, the pixel change amount is #000021, because the pixel change amount #000021 is greater than the threshold value #000010, so the original image to which pixel A1 belongs is sent to the data synchronization screen.

The method and device for screen sharing provided by the embodiments of the present invention divide the current frame image and the next frame image into the same number of meta-images with one-to-one correspondence, wherein the number of pixels contained in each meta-image in the current frame image The number of pixels contained in each element image in the next frame image is the same and one-to-one correspondence, and then further in each element image of the current frame image, respectively select a second preset number of pixel detection points, wherein, with the The pixel point in the next frame image corresponding to the selected pixel detection point is used as the target pixel point, so that only the pixel change amount of a part of the pixel point in the screen image can be calculated, and it can be determined whether the next frame image is relative to the current frame image. Changes have taken place. Compared with the calculation of the pixel changes of all pixels of the screen image in the prior art, the amount of calculation is reduced. Therefore, the speed of terminal operation is improved, and the speed of terminal image data transmission is accelerated, ensuring that the screen Real-time and fluency of sharing.

In another implementation mode provided by the embodiment of the present invention, the method for calculating the amount of pixel change is described. As shown in FIG. 3, step 301, calculate the distance between each pixel detection point and its corresponding target pixel point Pixel deltas include:

Step 301. Calculate pixel parameters of each pixel detection point, where the pixel parameters include RGB values of the three primary colors of the pixel.

For example, in FIG. 2a, the terminal calculates the RGB value of the pixel detection point with coordinates (0,1) as #FF0000.

Step 302, calculating pixel parameters of each target pixel point.

Referring to the example in step 301, in FIG. 2b, after calculation, the RGB value of the target pixel with coordinates (0,1) is #FF3030.

Step 303 , calculating the pixel change amount according to the pixel parameters of each pixel detection point and its corresponding target pixel point.

Wherein, as an implementation manner, the pixel parameter difference between each pixel detection point and the corresponding target pixel point may be calculated, and the calculated difference may be used as the pixel change amount.

Combined with the examples in step 301 and step 302, the difference between the RGB value of the pixel detection point with coordinates (0,1) and the corresponding target pixel point is #FF3030-#FF0000, that is, #003030, then #003030 can be used as Pixel change amount.

The screen sharing method provided by the embodiment of the present invention calculates the pixel change amount between each pixel detection point and its corresponding target pixel point, and can only calculate the pixel change amount of a part of the pixel points in the screen image to determine the next frame image Whether the image of the current frame has changed, therefore, the amount of calculation is reduced, the speed of terminal operation is improved, and the speed of terminal image data transmission is accelerated, which can ensure the real-time and smoothness of screen sharing.

It is worth emphasizing that in order to further improve the real-time performance and smoothness of the transmitted images in screen sharing, the transmitted images need to be processed. Based on this, in another implementation mode provided by the embodiment of the present invention, as shown in FIG. 4 As shown, in step 104, if the pixel variation is greater than the threshold, before sending the original image to which the target pixel whose pixel variation is greater than the threshold belongs to the data synchronization screen, step 401 may also be executed.

Step 401: Perform compression processing on the original image to which the target pixel point whose pixel change amount is greater than a threshold belongs.

It can be understood that when there are two identical data in the original image, only one of the data can be saved and transmitted, and duplicate and redundant data can be removed to compress the original image data. Based on this, in the embodiment of the present invention, The transmitted data can also be reduced by compressing the transmitted meta-image prior to transmission of the shared image.

The screen sharing method provided by the embodiment of the present invention can compress the transmitted meta-image, thus avoiding the transmission of redundant data and further improving the real-time performance and fluency of screen sharing.

Corresponding to the method shown in FIG. 1, FIG. 3 and FIG. 4, in order to solve the problem that the real-time performance and fluency of screen sharing cannot be guaranteed, an embodiment of the present invention proposes a screen sharing device, as shown in FIG. 5, The device includes: a division unit 501 , a selection unit 502 , a calculation unit 503 , a sending unit 505 and a compression unit 504 . Wherein, the division unit 501 , the selection unit 502 , the calculation unit 503 , the compression unit 504 and the sending unit 505 are connected in sequence, and the sending unit 505 is connected to the calculation unit 503 .

A division unit 501, configured to divide the current frame image and the next frame image into the same number of element images corresponding to one-to-one, wherein, the number of pixels contained in each element image in the current frame image and the number of pixels contained in each element image in the next frame image The number of pixels contained in the meta-images is the same and corresponds to each other, and each meta-image contains a first preset number of pixels;

The selection unit 502 is used to select a second preset number of pixel detection points in each element image divided by the division unit 501 of the current frame image, and the pixel points in the next frame image corresponding to the pixel detection points are the target Pixels, wherein the second preset number is smaller than the first preset number;

A calculation unit 503, configured to calculate the amount of pixel change between each pixel detection point selected by the selection unit 502 and its corresponding target pixel point;

The sending unit 505 is configured to send the meta image to which the target pixel whose pixel change amount is greater than the threshold belongs to the data synchronization screen if the pixel variation calculated by the calculation unit 503 is greater than the threshold.

The screen sharing device provided by the embodiment of the present invention divides the current frame image and the next frame image into the same number of meta-images with one-to-one correspondence, wherein the number of pixels contained in each meta-image in the current frame image and the next The number of pixels contained in each element image in a frame image is the same, and the pixels contained in the element image in the current frame image correspond to the pixels contained in the element image in the next frame image, and then further in each image of the current frame image In each element image, a second preset number of pixel detection points are respectively selected, wherein the pixel points in the next frame of image corresponding to the selected pixel detection points are just used as target pixel points, thereby, only each frame of image can be calculated The amount of pixel change of some pixels in the middle can determine whether the next frame image has changed relative to the current frame image. Compared with the calculation of the pixel change amount of all pixels of the screen image in the prior art, the amount of calculation is reduced, so , improving the running speed of the terminal, thereby speeding up the speed of image data transmission by the terminal, and ensuring the real-time and fluency of screen sharing.

In another implementation manner proposed by the embodiment of the present invention, the calculation unit 503 is also used to calculate the pixel parameters of each pixel detection point, and the pixel parameters include the RGB values of the three primary colors of the pixel; calculate the pixel parameters of each target pixel point ; Calculate the pixel change amount according to the pixel parameters of each pixel detection point and its corresponding target pixel point.

The screen sharing device provided by the embodiment of the present invention calculates the pixel change amount between each pixel detection point and its corresponding target pixel point, and can only calculate the pixel change amount of a part of the pixel points in the screen image to determine the next frame of image Whether the image of the current frame has changed, therefore, the amount of calculation is reduced, the speed of terminal operation is improved, and the speed of terminal image data transmission is accelerated, which can ensure the real-time and smoothness of screen sharing.

In another implementation mode proposed by the embodiment of the present invention, the calculation unit 503 is also used to calculate the difference between the pixel parameters of each pixel detection point and the corresponding target pixel, and use the calculated difference as the pixel change amount .

In another implementation manner proposed by the embodiment of the present invention, the compression unit 504 is configured to perform compression processing on an original image to which a target pixel point whose pixel change amount is greater than a threshold belongs.

The screen sharing device provided by the embodiment of the present invention can compress the transmitted meta-image, thus avoiding the transmission of redundant data and further improving the real-time performance and fluency of screen sharing.

An embodiment of the present invention also provides a terminal. As shown in FIG. 6 , the device includes a memory 601 , a processor 602 , a transceiver 603 , and a bus 604 . Wherein, the bus 604 is sequentially connected with the memory 601 , the processor 602 and the transceiver 603 .

The memory 601 may be a ROM (Read Only Memory, read-only memory) static storage device, a ROM dynamic storage device, or a RAM (Random Access Memory, random access memory). Memory 601 may store an operating system and other application programs. When implementing the technical solutions provided by the embodiments of the present invention through software or firmware, program codes for implementing the technical solutions provided by the embodiments of the present invention are stored in the memory 601 and executed by the processor 602 .

The transceiver 603 is used for communication with other devices or communication networks (such as but not limited to Ethernet, RAN Radio Access Network, wireless access network, WLAN (Wireless Local Area Network, wireless local area network), etc.).

The processor 602 may adopt a general-purpose central processing unit (Central Processing Unit, CPU), a microprocessor, an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits for Relevant programs are executed to realize the technical solutions provided by the embodiments of the present invention.

The bus 604 may include a path for transmitting information between various components (such as the memory 601 , the transceiver 603 and the processor 602 ) in the terminal of the embodiment of the present invention.

It should be noted that although the hardware shown in FIG. 6 only shows a memory 601, a transceiver 603, a processor 602, and a bus 604, in the specific implementation process, those skilled in the art should understand that the terminal also includes a normal Other devices necessary for operation. Meanwhile, according to specific needs, those skilled in the art should understand that hardware devices for realizing other functions may also be included.

Specifically, when the terminal shown in FIG. 6 is used to implement the device shown in the embodiment of FIG. 5, the processor 602 in the device is used to divide the current frame image and the next frame image into the same number and one-to-one correspondence , wherein the number of pixels contained in each meta image in the current frame image and the number of pixels contained in each meta image in the next frame image are the same and one-to-one correspondence, and each meta image contains the first preset number of pixels; respectively select a second preset number of pixel detection points in each element image of the current frame image, and the pixel points in the next frame image corresponding to the pixel detection points are target pixel points, wherein the second The preset number is less than the first preset number; calculating the pixel change amount between each pixel detection point and its corresponding target pixel point;

The transceiver 603 is configured to send the meta image to which the target pixel whose pixel change amount is greater than the threshold belongs to the data synchronization screen if the pixel change amount is greater than the threshold value.

The terminal provided by the embodiment of the present invention divides the current frame image and the next frame image into the same number of meta-images with one-to-one correspondence, wherein the number of pixels contained in each meta-image in the current frame image and the number of pixels in the next frame image The number of pixels contained in each element image in the image is the same and one-to-one correspondence, and then further in each element image of the current frame image, respectively select a second preset number of pixel detection points, wherein, with the selected pixel detection points The corresponding pixel in the next frame of image is used as the target pixel, so that only the pixel variation of a part of the pixels in the screen image can be calculated to determine whether the next frame of image has changed relative to the current frame of image, and In the prior art, compared with the calculation of the pixel changes of all pixels of the screen image, the amount of calculation is reduced, so the speed of terminal operation is improved, and the speed of terminal image data transmission is accelerated, which can ensure the real-time performance of screen sharing and fluency.

The processor 602 is also used to calculate the pixel parameters of each pixel detection point, and the pixel parameters include the RGB values of the three primary colors of the pixel; calculate the pixel parameters of each target pixel point; The pixel parameter calculates the amount of pixel change.

The screen sharing terminal provided by the embodiment of the present invention calculates the pixel change amount between each pixel detection point and its corresponding target pixel point, and can only calculate the pixel change amount of a part of the pixel points in the screen image to determine the next frame of image Whether the image of the current frame has changed, therefore, the amount of calculation is reduced, the speed of terminal operation is improved, and the speed of terminal image data transmission is accelerated, which can ensure the real-time and smoothness of screen sharing.

The processor 602 is further configured to calculate a pixel parameter difference between each pixel detection point and the corresponding target pixel point, and use the calculated difference as a pixel change amount.

The processor 602 is configured to perform compression processing on an element image to which a target pixel point whose pixel change amount is greater than a threshold belongs.

The screen sharing terminal provided by the embodiment of the present invention can compress the transmitted meta-image, thus avoiding the transmission of redundant data and further improving the real-time performance and fluency of screen sharing.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be realized by means of software plus necessary general-purpose hardware, and of course also by hardware, but in many cases the former is a better embodiment . Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product is stored in a readable storage medium, such as a floppy disk of a computer , a hard disk or an optical disk, etc., including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute the methods of various embodiments of the present invention.

The above are only specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or replacements within the technical scope disclosed in the present invention shall be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. A method for screen sharing, characterized in that the method comprises: The current frame image and the next frame image are respectively divided into the same number of element images corresponding to each other, wherein, the number of pixels contained in each element image in the current frame image and the number of pixels contained in each element image in the next frame image The images contain the same number of pixels and are in one-to-one correspondence, and each element image contains a first preset number of pixels; A second preset number of pixel detection points are respectively selected in each element image of the current frame image, and the pixel points in the next frame image corresponding to the pixel detection points are target pixel points, wherein the first 2. The preset quantity is smaller than the first preset quantity; Calculate the amount of pixel change between each pixel detection point and its corresponding target pixel point; If the pixel change amount is greater than the threshold value, the original image to which the target pixel point whose pixel change amount is greater than the threshold value belongs to is sent to the data synchronization screen. 2. The method for screen sharing according to claim 1, wherein calculating the pixel change amount between each pixel detection point and the corresponding target pixel point comprises: Calculate the pixel parameters of each pixel detection point; Calculate the pixel parameters of each target pixel; The pixel change amount is calculated according to the pixel parameters of each pixel detection point and its corresponding target pixel point. 3. The screen sharing method according to claim 2, wherein the pixel parameters include RGB values of the three primary colors of the pixel. 4. The method for screen sharing according to claim 2, wherein the calculation of the pixel change amount according to the pixel parameters of each pixel detection point and its corresponding target pixel point comprises: The difference between the pixel parameters of each pixel detection point and the corresponding target pixel is calculated, and the calculated difference is used as the pixel change amount. 5. The screen sharing method according to any one of claims 1 to 4, characterized in that, if the amount of pixel change is greater than a threshold value, the original image to which the target pixel point whose pixel change amount is greater than the threshold value is sent Before proceeding to the data synchronization screen, the method further includes: Perform compression processing on the original image to which the target pixel point whose pixel variation is greater than the threshold belongs. 6. A device for screen sharing, characterized in that the device comprises: A division unit, configured to divide the current frame image and the next frame image into the same number of meta-images corresponding to one-to-one, wherein the number of pixels contained in each meta-image in the current frame image is the same as that of the next frame Each meta-image in the image contains the same number of pixels and one-to-one correspondence, and each meta-image respectively contains a first preset number of pixels; A selection unit, configured to select a second preset number of pixel detection points in each element image divided by the division unit of the current frame image, and the pixel detection points corresponding to the pixel detection points in the next frame image The pixel point is a target pixel point, wherein the second preset number is smaller than the first preset number; A calculation unit, configured to calculate the amount of pixel variation between each pixel detection point selected by the selection unit and its corresponding target pixel; The sending unit is configured to send the meta image to which the target pixel whose pixel change amount is greater than the threshold belongs to the data synchronization screen if the pixel change amount calculated by the calculation unit is greater than the threshold value. 7. The screen sharing device according to claim 6, characterized in that, The calculation unit is also used to calculate the pixel parameters of each pixel detection point; calculate the pixel parameters of each target pixel point; calculate the pixel change amount according to the pixel parameters of each pixel detection point and its corresponding target pixel point. 8 . The screen sharing device according to claim 7 , wherein the pixel parameters include RGB values of three primary colors of the pixel. 9. The screen sharing device according to claim 7, characterized in that, The calculation unit is further configured to calculate the difference between the pixel parameters of each pixel detection point and the corresponding target pixel, and use the calculated difference as the pixel change amount. 10. The screen sharing device according to any one of claims 6 to 9, further comprising: The compression unit is configured to perform compression processing on the original image to which the target pixel point whose pixel change amount is greater than a threshold belongs.