CN117201814A - Remote desktop screen frame image transmission method, system and storage medium - Google Patents
Remote desktop screen frame image transmission method, system and storage medium Download PDFInfo
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Abstract
The invention discloses a remote desktop screen frame image transmission method, a remote desktop screen frame image transmission system and a remote desktop screen frame image transmission storage medium, which are applied to the technical field of network and information security, and can effectively reduce the transmission delay of screen frame images and relieve the problem of remote desktop display blocking. The method comprises the following steps: acquiring a remote desktop screen frame image; comparing the remote desktop screen frame image with a previous screen image to obtain image difference data; carrying out preset encoding compression processing on the image difference data to obtain encoding compression data; transmitting the encoded compressed data to a preset control end; when the preset control end receives the coded compressed data, carrying out preset decoding and restoring treatment on the coded compressed data to obtain restored data; wherein the preset decoding reduction process corresponds to the preset encoding compression process; and performing window rendering on the preset control end according to the restored data to obtain a target screen frame image.
Description
Technical Field
The invention relates to the technical field of network and information security, in particular to a remote desktop screen frame image transmission method, a remote desktop screen frame image transmission system and a storage medium.
Background
Along with the development of digitization and informatization, computer terminals are increasingly not separated in life and work, and the remote desktop technology is gradually and widely applied to application scenes such as mobile office, office automation and the like, and the situation that some works are often required to be completed by remotely operating an office computer is required in work. However, in the related art, many remote desktop tools often have problems of unsmooth remote screen display and image blocking during operation. Therefore, the above technical problems need to be solved.
Disclosure of Invention
In order to solve at least one of the above technical problems, the invention provides a remote desktop screen frame image transmission method, a remote desktop screen frame image transmission system and a storage medium, which can effectively reduce the transmission delay of screen frame images and relieve the problem of remote desktop display blocking.
In one aspect, an embodiment of the present invention provides a remote desktop screen frame image transmission method, including the following steps:
acquiring a remote desktop screen frame image;
comparing the remote desktop screen frame image with a previous screen image to obtain image difference data; wherein the last frame of screen image is the previous frame of the remote desktop screen frame image;
Carrying out preset encoding compression processing on the image difference data to obtain encoding compression data;
transmitting the encoded compressed data to a preset control end;
when the preset control end receives the coded compressed data, carrying out preset decoding and restoring treatment on the coded compressed data to obtain restored data; wherein the preset decoding reduction process corresponds to the preset encoding compression process;
and performing window rendering on the preset control end according to the restored data to obtain a target screen frame image.
According to some embodiments of the invention, the acquiring a remote desktop screen frame image includes:
acquiring images of a full screen and full pixels of a remote desktop screen through a preset acquisition frequency to obtain a frame image of the remote desktop screen; the remote desktop screen frame image comprises pixel point coordinate data and pixel point pixel values.
According to some embodiments of the invention, the comparing the remote desktop screen frame image with the previous screen image to obtain image difference data includes:
traversing the pixel value of the pixel point of the remote desktop screen frame image, and recording the pixel point coordinate data corresponding to the pixel point of which the pixel value of the pixel point of the remote desktop screen frame image is different from that of the pixel point of the previous screen image to obtain difference coordinate data;
And obtaining the image difference data according to the difference coordinate data and the corresponding pixel value of the pixel point.
According to some embodiments of the invention, the pixel point coordinate data includes abscissa data and ordinate data;
storing bit data of a pre-preset bit number in the abscissa data into a first byte;
storing bit data of a later preset bit number in the abscissa data into a first bit area of a second byte; wherein the post preset bit number is the total bit number of the pixel point coordinate data minus the remaining bit number of the pre preset bit number;
storing the bit data of the pre-preset bit number in the ordinate data to a third byte;
storing the bit data of the post preset bit number in the ordinate data to a second bit area of the second byte to obtain a fourth byte;
storing the pixel value of the pixel point to a fifth byte;
performing preset compression processing according to the first byte, the third byte, the fourth byte and the fifth byte to obtain the encoded compressed data; wherein the encoded compressed data comprises byte stream data.
According to some embodiments of the invention, before performing the step of comparing the remote desktop screen frame image with a previous screen image to obtain image difference data, the method further comprises:
When the remote desktop screen frame image is determined to be a first frame image, carrying out preset image coding on the remote desktop screen frame image to obtain image coding data;
and sending the image coding data to the preset control end.
According to some embodiments of the present invention, the performing a preset decoding restoration process on the encoded compressed data to obtain restored data includes:
carrying out preset decompression processing on the encoded compressed data to obtain decompressed data; wherein the preset decompression process corresponds to the preset compression process;
and extracting the first byte, the third byte, the fourth byte and the fifth byte from the decompressed data, and restoring the first byte, the third byte and the fourth byte to obtain the pixel point coordinate data.
According to some embodiments of the invention, the method further comprises:
when the preset control end is determined to receive the image coding data, storing the image coding data to the preset control end;
and performing image rendering according to the display window size of the preset control end and the image coding data to obtain the target screen frame image.
On the other hand, the embodiment of the invention also provides a remote desktop screen frame image transmission system, which comprises:
the first module is used for acquiring a remote desktop screen frame image;
the second module is used for comparing the remote desktop screen frame image with the previous screen image to obtain image difference data; wherein the last frame of screen image is the previous frame of the remote desktop screen frame image;
the third module is used for carrying out preset coding compression processing on the image difference data to obtain coding compression data;
a fourth module, configured to transmit the encoded compressed data to a preset control end;
a fifth module, configured to, when it is determined that the preset control unit receives the encoded compressed data, perform preset decoding restoration processing on the encoded compressed data to obtain restored data; wherein the preset decoding reduction process corresponds to the preset encoding compression process;
and a sixth module, configured to perform window rendering on the preset control end according to the restored data, so as to obtain a target screen frame image.
On the other hand, the embodiment of the invention also provides a remote desktop screen frame image transmission system, which comprises:
At least one processor;
at least one memory for storing at least one program;
the at least one program, when executed by the at least one processor, causes the at least one processor to implement the remote desktop screen frame image transmission method as described in the above embodiments.
In another aspect, an embodiment of the present invention further provides a computer storage medium, in which a program executable by a processor is stored, where the program executable by the processor is used to implement the remote desktop screen frame image transmission method according to the above embodiment.
The remote desktop screen frame image transmission method, the remote desktop screen frame image transmission system and the storage medium have at least the following beneficial effects: according to the embodiment of the invention, the remote desktop screen frame image is firstly obtained, and the remote desktop screen frame image is compared with the last frame of screen image, so that the difference between the currently obtained remote desktop screen frame image and the last frame of desktop screen frame image, namely the last frame of screen image, is obtained, and the image difference data is obtained. Further, in the embodiment of the invention, the image difference data is subjected to preset encoding compression processing to obtain encoded compression data, and the encoded compression data is transmitted to the preset control end, so that the amount of transmitted data is effectively reduced by encoding compression of the difference data between images of the front frame and the rear frame and transmission to the preset control end, and the transmission delay of the screen frame image is effectively reduced. And then, when the preset control end is determined to receive the encoded compressed data, the encoded compressed data is subjected to preset decoding reduction processing to obtain reduction data, and window rendering is performed on the preset control end according to the reduction data to obtain a target screen frame image, so that the reduction of the remote desktop screen frame image is realized, the transmission efficiency of the remote desktop screen frame image is effectively improved, the transmission delay of the screen frame image is effectively reduced, and the problem of remote desktop display blocking is relieved.
Drawings
FIG. 1 is a flowchart of a method for transmitting remote desktop screen frame images according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an image acquisition result data format according to an embodiment of the present application;
FIG. 3 is a schematic diagram of the coding and decoding principle according to an embodiment of the present application;
FIG. 4 is a schematic diagram of byte stream data formed after encoding according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a first byte calculation process in a position encoding process according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a third byte calculation process in a position encoding process according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a fourth byte calculation process in a position encoding process according to an embodiment of the present application;
FIG. 8 is a flowchart illustrating a method for transmitting a remote desktop screen frame image according to an embodiment of the present application;
FIG. 9 is a modular view of a remote desktop screen frame image transmission system provided by an embodiment of the present application;
fig. 10 is a schematic block diagram of a remote desktop screen frame image transmission system according to an embodiment of the present application.
Detailed Description
The embodiments described herein should not be construed as limiting the application, and all other embodiments, which may be made by those of ordinary skill in the art without the benefit of the present disclosure, are intended to be within the scope of the present application.
In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is to be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with one another without conflict.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the application only and is not intended to be limiting of the application.
Before describing embodiments of the present application, related terms referred to in the present application will be first described.
Remote desktop: is a mode of remotely operating a computer for visually accessing the desktop environment of the remote computer, allowing a user to connect to the remote computer over a network and use the remote computer's desktop interface and application programs on the local computer. The remote desktop can be connected in a local area network or through the Internet, and is commonly used in the scenes of tele-office, remote technical support, remote education and the like.
Along with the development of digitization and informatization, computer terminals are increasingly not separated in life and work, and the remote desktop technology is gradually and widely applied to application scenes such as mobile office, office automation and the like, and the situation that some works are often required to be completed by remotely operating an office computer is required in work. However, in the related art, many remote desktop tools often have problems of unsmooth remote screen display and image blocking during operation. Therefore, the above technical problems need to be solved.
An embodiment of the invention provides a remote desktop screen frame image transmission method, a remote desktop screen frame image transmission system and a storage medium, which can effectively reduce the transmission delay of screen frame images and relieve the problem of remote desktop display blocking. Referring to fig. 1, the method of the embodiment of the present invention includes, but is not limited to, step S110, step S120, step S130, step S140, step S150, and step S160.
Specifically, the method application process of the embodiment of the invention includes, but is not limited to, the following steps:
s110: and acquiring a remote desktop screen frame image.
S120: and comparing the remote desktop screen frame image with the previous screen image to obtain image difference data. Wherein the last frame of screen image is the previous frame of remote desktop screen frame image.
S130: and carrying out preset encoding compression processing on the image difference data to obtain encoding compression data.
S140: and transmitting the encoded compressed data to a preset control end.
S150: when the preset control end is determined to receive the coded compressed data, carrying out preset decoding and restoring treatment on the coded compressed data to obtain restored data. The preset decoding reduction processing corresponds to the preset encoding compression processing.
S160: and performing window rendering at a preset control end according to the restored data to obtain a target screen frame image.
In this embodiment, the embodiment of the present invention first obtains a remote desktop screen frame image. Specifically, in the embodiment of the invention, the remote desktop screen frame image is a desktop screen image of a remote computer. The embodiment of the invention collects the screen image of the remote computer through a preset screen image capturing technology. For example, embodiments of the present invention capture desktop screen frame images of a remote computer via DXGI (image infrastructure, directX Graphics Infrastructure) technology. Then, the embodiment of the invention compares the acquired remote desktop screen frame image with the previous screen image to obtain image difference data. Specifically, in the embodiment of the present invention, the last frame of screen image refers to the previous frame of image of the acquired remote desktop screen frame image, that is, the remote desktop screen frame image acquired last time. The embodiment of the invention compares the currently acquired remote desktop screen frame image with the previously acquired remote desktop screen frame image, namely the last frame of screen image, so as to determine the change information of the remote desktop screen image, thereby obtaining the image difference data. Further, the embodiment of the invention performs preset encoding compression processing on the image difference data to obtain encoded compressed data. Specifically, the preset encoding compression processing in the embodiment of the present invention may be to perform image encoding compression on an area image with a difference, or encode data information related to pixels with a difference into byte stream data, and perform compression processing to obtain encoded compressed data. It is easy to understand that in the embodiment of the present invention, by performing preset encoding compression processing on the image difference data of the remote desktop screen frame image and the previous frame screen image, since the difference between the previous frame and the next frame is usually smaller, the embodiment of the present invention only performs preset encoding compression on the difference portion, so that the amount of data to be transmitted is effectively reduced, the obtained encoding compression data occupies a smaller bandwidth, and the problem of blocking caused by the overlarge remote desktop screen frame image can be effectively alleviated.
Then, the embodiment of the invention transmits the obtained coded compressed data to a preset control end. After the image difference data are subjected to coding compression processing, the corresponding coding compression data are transmitted to a preset control end, namely, a device end used for controlling a remote computer by a user so as to restore a remote desktop screen frame image at the preset control end. Further, when it is determined that the preset control end receives the encoded compressed data, the embodiment of the invention performs preset decoding and restoring processing on the encoded compressed data to obtain restored data. Specifically, in the embodiment of the present invention, the preset decoding reduction process corresponds to the preset encoding compression process, that is, the preset decoding reduction process is a reverse process of the preset encoding compression process. According to the embodiment of the invention, the preset decoding reduction processing is carried out on the encoded compressed data, namely decompression and decoding are carried out, so that the reduced data is obtained, namely corresponding image difference data is obtained through reduction. Finally, according to the embodiment of the invention, window rendering is carried out at the preset control end according to the restored data, and the target screen frame image is obtained. Specifically, the embodiment of the invention replaces and renders the image displayed at the corresponding position according to the restored image difference data on the basis of the screen frame image displayed in the previous frame, thereby restoring the current remote desktop screen frame image, realizing the efficient transmission of the remote desktop screen frame image, reducing the transmission delay of the screen frame image and relieving the problem of remote desktop display blocking.
In some embodiments of the present invention, a remote desktop screen frame image is acquired, including, but not limited to, the steps of:
and acquiring images of the full screen and full pixels of the remote desktop screen through a preset acquisition frequency to obtain a frame image of the remote desktop screen. The remote desktop screen frame image comprises pixel point coordinate data and pixel point pixel values.
In this embodiment, the embodiment of the present invention collects the image of the remote desktop screen by presetting the collection frequency. Specifically, when the remote desktop screen is acquired in the embodiment of the invention, the pixel points of the whole screen in the remote desktop screen are acquired, namely the image acquisition of the whole screen and the whole pixel points is performed. Meanwhile, the preset acquisition frequency in the embodiment of the invention refers to the preset image acquisition frequency, and the embodiment of the invention carries out high-speed acquisition on the remote desktop screen through the preset acquisition frequency, for example, 20 to 60 frames per second, so that the difference between each acquired frame of image and the last frame of image is smaller, and the transmitted data volume is further reduced. In addition, the embodiment of the invention collects the remote desktop screen by presetting the collection frequency, and can timely capture the change condition of the remote desktop screen by increasing the collection frequency, thereby alleviating the problem of remote desktop display blocking caused by screen image acquisition lag. The embodiment of the invention is connected to a remote computer under a preset operating system. When the remote computer receives the corresponding control instruction, the screen image is started to be collected at a high speed according to the corresponding resolution and the preset collection frequency, such as 20-60 frames per second. Meanwhile, in the process of collecting the remote desktop screen frame image, the embodiment of the invention adopts a full-screen full-pixel collecting mode to collect the RGB value of each pixel, and the collected remote desktop screen frame image comprises pixel point coordinate data, such as abscissa data and ordinate data, and pixel point pixel values. Correspondingly, in the embodiment of the invention, the remote desktop screen frame image is stored through the preset matrix table, and the preset matrix table comprises pixel point coordinate data and pixel point pixel values. Referring to fig. 2, a preset matrix table in an embodiment of the present invention includes pixel coordinate data and pixel values of pixels. In the embodiment of the present invention, the pixel coordinate data refers to the position information of the pixel in the image, such as row data (horizontal position) and column data (vertical position). Accordingly, in the embodiment of the present invention, the pixel values of the pixel point include a pixel red value (R value), a pixel green value (G value), and a pixel blue value (B value). In the embodiment of the invention, the preset matrix table is a three-dimensional matrix table, and is stored in a mode of (a first-dimension vertical coordinate, a second-dimension horizontal coordinate, a third-dimension pixel red value (R value), a pixel green value (G value) and a pixel blue value (B value)).
In some embodiments of the present invention, the remote desktop screen frame image is compared to the previous frame screen image to obtain image difference data, including but not limited to the following steps:
and traversing pixel values of pixels of the remote desktop screen frame image, and recording pixel coordinate data corresponding to pixels with differences between the pixel values of pixels of the remote desktop screen frame image and the previous frame of screen image to obtain difference coordinate data.
And obtaining image difference data according to the difference coordinate data and the corresponding pixel value of the pixel point.
In this embodiment, the embodiment of the present invention obtains the image difference data by traversing each pixel point of the remote desktop screen frame image and the previous frame screen image to determine the difference data of the remote desktop screen frame image and the previous frame screen image. Specifically, according to the embodiment of the invention, firstly, pixel value traversal comparison is carried out according to each pixel according to the remote desktop screen frame image and the last frame screen image, so that the pixel points, namely the pixel points with difference in pixel values, of the remote desktop screen frame image and the last frame screen image are determined. Then, the embodiment of the invention records the pixel point coordinate data corresponding to the pixel point with the difference between the pixel point pixel values of the remote desktop screen image and the previous screen image, thereby obtaining corresponding difference coordinate data. Meanwhile, when corresponding difference coordinate data is obtained through recording, the embodiment of the invention also records the pixel value of the corresponding pixel point. Further, in the embodiment of the invention, the image difference data is constructed by the recorded difference coordinate data and the corresponding pixel values of the pixel points. It is easy to understand that in the embodiment of the invention, by traversing the remote desktop screen frame image and the last screen image to compare the pixel point difference of the front and rear two frames of images, the difference data of the remote desktop screen frame image can be rapidly determined, no complex searching process and algorithm are needed, and the requirement on hardware performance is low.
In some embodiments of the invention, the pixel point coordinate data includes abscissa data and ordinate data. Correspondingly, in the embodiment of the invention, the image difference data is subjected to preset encoding compression processing to obtain encoding compression data, which includes but is not limited to the following steps:
and storing the bit data of the pre-preset bit number in the abscissa data into the first byte.
And storing bit data of a later preset bit number in the abscissa data into a first bit area of the second byte. The post preset bit number is the total bit number of the pixel point coordinate data minus the remaining bit number of the pre-preset bit number.
And storing the bit data of the pre-preset bit number in the ordinate data into a third byte.
And storing bit data of a later preset bit number in the ordinate data into a second bit area of the second byte to obtain a fourth byte.
And storing the pixel value of the pixel point to a fifth byte.
And carrying out preset compression processing according to the first byte, the third byte, the fourth byte and the fifth byte to obtain encoded compressed data. Wherein the encoded compressed data comprises byte stream data.
In this specific embodiment, the pixel point coordinate data stored in the embodiment of the present invention includes abscissa data and ordinate data. In the embodiment of the invention, the abscissa data refers to the abscissa of the pixel point with the difference in pixel value between the currently acquired remote desktop screen image and the last frame of screen image, and the ordinate data refers to the ordinate of the pixel point with the difference in pixel value between the currently acquired remote desktop screen image and the last frame of screen image. Referring to fig. 3, the embodiment of the present invention encodes and stores the abscissa data and the ordinate data of the pixel point into three bytes, respectively. Specifically, the embodiment of the invention firstly stores the bit data of the front preset bit number in the abscissa data into the first byte, and stores the bit data of the rear preset bit number in the abscissa data into the first bit area of the second byte. It should be noted that, in the embodiment of the present invention, the post-preset bit number is the number of bits left by subtracting the pre-preset bit number from the total bit number of the pixel coordinate data, for example, the total bit number of the pixel coordinate data is 12 bits (bit), for example, the abscissa data or the ordinate data are both 12 bits, and the first byte may store 8 bits of data, then the embodiment of the present invention stores the first 8 bits of bit data in the abscissa data into the first byte, and at this time, the post-preset bit number is 4 bits, and is obtained by subtracting 8 from 12. Accordingly, in the embodiment of the present invention, the second byte includes a first bit area and a second bit area. For example, one byte of the embodiment of the present invention may store 8 bits of data, and the embodiment of the present invention divides the first 4-bit area of the second byte into a first bit area and divides the last 4-bit area into a second bit area. Correspondingly, the embodiment of the invention stores the remaining data of the abscissa data, namely the bit data of the post preset bit number, into the first bit area.
Further, in the embodiment of the present invention, the bit data of the first preset number of bits in the ordinate data is stored into the third byte, and the bit data of the last preset number in the ordinate data is stored into the second bit area of the second byte, so as to construct and obtain the fourth byte. The calculation manners of the front preset number of bits and the rear preset number of bits in the embodiment of the present invention are the same as those of the front preset number of bits and the rear preset number of bits of the abscissa data, and are not described herein. Further, the embodiment of the invention stores the pixel value of the corresponding pixel point to the fifth byte. Specifically, in the embodiment of the present invention, the pixel values of the pixel point include a pixel red value (R value), a pixel green value (G value), and a pixel blue value (B value). Accordingly, the fifth byte in the embodiment of the present invention includes a pixel red value storage byte, a pixel green value storage byte, and a pixel blue value storage byte. According to the embodiment of the invention, corresponding pixel data, such as an R value, a G value and a B value, in pixel values of the pixel points are stored in corresponding fifth bytes, such as an R value is stored in a pixel red storage byte, a G value is stored in a pixel green storage byte and a B value is stored in a pixel blue storage byte. Further, the embodiment of the invention performs preset compression processing according to the first byte, the third byte, the fourth byte and the fifth byte to obtain encoded compressed data. Specifically, the preset compression processing in the embodiment of the present invention includes compression processing by zlib (data compression library). Accordingly, the encoded compressed data obtained by compression in the embodiment of the present invention is byte stream data. In the embodiment of the invention, the first byte, the third byte, the fourth byte and the fifth byte can be compressed by using a gzip and deflate compression algorithm. In the embodiment of the invention, the corresponding byte stream data, namely the encoded compressed data, is obtained by carrying out the preset encoding compression processing on the corresponding difference data, and the image is converted into the data stream for processing, so that the lossless compression of the data can be realized, the compression efficiency is effectively improved, and the image quality is not influenced. It should be noted that, in the embodiment of the present invention, the process of performing the preset encoding compression processing on the image difference data to obtain the encoded compressed data is repeated continuously, so as to generate a sequential byte stream, as shown in fig. 4.
It should be noted that, in some embodiments of the present invention, the manner in which the abscissa data and the ordinate data are stored in 3 bytes may be customized. For example, the embodiment of the invention may store the first 8 bits of the abscissa data into the first byte, the last 4 bits into the first four bits of the second byte, the first 4 bits of the ordinate data into the last four bits of the second byte, and the last 8 bits of the ordinate data into the third byte. Accordingly, in the process of performing decoding reduction processing, reverse processing is required according to the corresponding coding setting. Illustratively, in the embodiment of the present invention, the maximum resolution of the display is 4K (4096×2160, the horizontal coordinate (abscissa) x takes the values of 0-4095, the vertical coordinate (ordinate) y takes the values of 0-2159), and 12 bits can just represent a positive integer up to 4095, and the minimum coding unit of the computer is one byte (8 bits), so the embodiment of the present invention stores the abscissa data and the ordinate data by three bytes. Referring to fig. 5, 6 and 7, in the embodiment of the present invention, coordinates of pixels with differences are x=3196, y=2059, and rgb colors are [206,182,255]. Correspondingly, the binary of the abscissa data is 110001111100, the binary of the ordinate data is 100000001011, and the binary corresponding to the rgb color is [11001110, 10110110,11111111]. Referring to fig. 5, in calculating the value stored in the first byte, x and y are defined as 16-bit unsigned integer data, and the embodiment of the present invention calculates the data stored in the first byte by right-shifting the binary abscissa data by 4 bits. Referring to fig. 6, the embodiment of the present invention calculates the data stored in the third byte by shifting the binary ordinate data by 8 bits to the left, i.e. the last 8 bits of the ordinate data are stored in the third byte. Referring to fig. 7, in calculating the data stored to the fourth byte, the embodiment of the present invention first shifts left the binary abscissa data by 12 bits to obtain the last 4 bits of the abscissa data. Then, the embodiment of the invention right shifts the obtained last 4-bit data by 8 bits and adds the data obtained by right shifting the binary ordinate data by 8 bits, thereby obtaining 8-bit data finally stored in the second byte and obtaining the fourth byte.
In some embodiments of the present invention, before performing the step of comparing the remote desktop screen frame image with the previous screen image to obtain the image difference data, the remote desktop screen frame image transmission method provided by the embodiment of the present invention further includes, but is not limited to, the following steps:
and when the remote desktop screen frame image is determined to be the first frame image, carrying out preset image coding on the remote desktop screen frame image to obtain image coding data.
And sending the image coding data to a preset control end.
In this embodiment, after the remote desktop screen frame image is obtained, the embodiment of the present invention first determines whether the remote desktop screen frame image is a first frame image, so as to determine whether the entire remote desktop screen frame image needs to be sent to a preset control end. Specifically, in the embodiment of the invention, in the process of remotely controlling the remote computer through the preset control end, the acquired remote desktop screen frame image of the first frame needs to be completely transmitted to the preset control end. It is easy to understand that, in the embodiment of the present invention, the transmission of the remote desktop screen frame image is realized by performing encoding compression on the image difference data, so that the acquired desktop screen frame image of the remote computer of the first frame needs to be completely sent to the preset control end, so that the corresponding difference data can be restored and obtained according to the received encoding compression data, and then the corresponding pixel point is replaced, and the current remote desktop screen frame image is rendered and obtained. Correspondingly, when the acquired remote screen frame image is determined to be the first frame image, namely, the first frame image acquired in the remote desktop control process, the embodiment of the invention performs preset image coding on the remote desktop screen frame image to acquire corresponding image coding data. Illustratively, when the remote desktop screen frame image is determined to be the first frame image, the embodiment of the invention directly encodes according to the preset PNG image, thereby obtaining image encoded data. Wherein PNG (Portable Network Graphics) in the embodiment of the present invention is a lossless image coding format for storing and transmitting images, which is an index-based color image format capable of supporting 256 different colors. In addition, since the PNG image encoding algorithm uses a lossless compression manner, it is possible to reduce the file size while maintaining the image quality. The embodiment of the invention adopts the PNG image coding algorithm to code the acquired first frame remote desktop screen frame image so as to compress the image and simultaneously maintain the image quality. Further, the embodiment of the invention sends the encoded image encoded data to the preset control end, so that the preset control end performs image rendering according to the obtained encoded image data, and restores to obtain a complete remote desktop screen frame image.
In some embodiments of the present invention, the encoded compressed data is subjected to a preset decoding restoration process to obtain restored data, including but not limited to the following steps:
and carrying out preset decompression processing on the encoded compressed data to obtain decompressed data. Wherein the preset decompression process corresponds to the preset compression process.
And extracting the first byte, the third byte, the fourth byte and the fifth byte from the decompressed data, and restoring the first byte, the third byte and the fourth byte to obtain pixel point coordinate data.
In this embodiment, the embodiment of the present invention decompresses and decodes the received encoded compressed data by presetting a reverse processing procedure of the encoding compression processing, thereby obtaining corresponding pixel coordinate data and pixel values. Specifically, in the embodiment of the invention, firstly, preset decompression processing is performed on the encoded compressed data to obtain decompressed data. In the embodiment of the invention, the preset decompression processing corresponds to the preset compression processing. For example, in the embodiment of the present invention, compression processing is performed by zlib to obtain encoded compressed data, and accordingly, after receiving byte stream data sent from a remote end, that is, encoded compressed data, the embodiment of the present invention also performs decompression by zlib to obtain decompressed data. Further, the embodiment of the invention extracts the corresponding first byte, third byte, fourth byte and fifth byte from the decompressed data, namely, extracts the corresponding pixel point coordinate data and pixel point pixel value, decodes the extracted first byte, third byte and fourth byte according to the reverse process of the encoding process, and restores the extracted first byte, third byte and fourth byte to obtain the pixel point coordinate data, such as abscissa data and ordinate data. Illustratively, the fifth byte in the embodiment of the present invention includes a pixel red value storage byte, a pixel green value storage byte, and a pixel blue value storage byte, and the pixel values include a pixel red value (R value), a pixel green value (G value), and a pixel blue value (B value). Accordingly, in the embodiment of the present invention, the R value corresponds to the pixel red storage byte, the G value corresponds to the pixel green storage byte, and the B value corresponds to the pixel blue storage byte. Therefore, in the embodiment of the present invention, information of a differential pixel is stored in every 6 bytes, and in the embodiment of the present invention, 6 bytes are read from the beginning of decompressed data obtained by decompression, coordinate data of the pixel is restored by the first three bytes of the read 6 bytes of data, such as abscissa data and ordinate data, and at the same time, pixel values of the pixel are obtained by extracting the last three bytes of the read 6 bytes of data. For example, in the encoding process, the embodiment of the invention stores the first 8 bits of the abscissa data into the first byte, the last 4 bits into the first four bits of the second byte, and the first 4 bits of the ordinate data into the last four bits of the second byte, and the last 8 bits of the ordinate data into the third byte, so that in the process of restoring the coordinate data of the pixel point, the embodiment of the invention adds the 8 bits of the first byte to the first 4 bits of the second byte in the first three bytes to form complete 12 bits of data, restores to obtain the abscissa data, and adds the last 4 bits of the second byte to the 8 bits of the third byte to form complete 12 bits of data, and reconstructs to obtain the ordinate data.
It is easy to understand that after the corresponding pixel coordinate data is restored, for example, the abscissa data and the ordinate data, the pixel coordinate data is used to find the pixel at the corresponding position from the previous frame of screen image, and the pixel value of the pixel is replaced by the pixel value of the pixel read from the fifth byte, so that the pixel update of the differential pixel is realized. Correspondingly, after processing 6 bytes of data, the embodiment of the invention repeats the process of extracting the first byte, the third byte, the fourth byte and the fifth byte from the decompressed data and recovering the first byte, the third byte and the fourth byte to obtain the coordinate data of the pixel point, namely, continuously reading the subsequent 6 bytes of data, decompressing and decoding until all bytes are read and all differential pixels are replaced. Then, the embodiment of the invention takes the image data obtained after replacement as the screen image data of the frame, and renders the image to the window after mapping according to the display window size of the preset controller, thereby realizing remote desktop display and alleviating the problem of remote desktop display blocking caused by overlarge transmitted remote desktop screen frame image.
In some embodiments of the present invention, the remote desktop screen frame image transmission method provided in the embodiments of the present invention further includes, but is not limited to, the following steps:
when the preset control end is determined to receive the image coding data, the image coding data is stored to the preset control end.
And performing image rendering according to the display window size of the preset control end and the image coding data to obtain a target screen frame image.
In this embodiment, when receiving the encoded compressed data transmitted by the remote computing, the embodiment of the present invention first determines whether the encoded compressed data is image encoded data. Specifically, in the embodiment of the invention, when the remote desktop screen frame image of the first frame is acquired, the remote desktop screen frame image of the first frame needs to be completely transmitted to the preset control end, and when the subsequent remote desktop screen frame image is acquired, the image difference data between the remote desktop screen frame image of the first frame and the remote desktop screen frame image of the previous frame is transmitted to the preset control end. Therefore, the encoding compression scheme adopted for the first frame image is different from that for the other frames. Correspondingly, when the data received by the preset control end is determined to be the image coding data, the embodiment of the invention firstly stores the image coding data into the memory of the local equipment, namely the preset control end. Then, the embodiment of the invention performs image rendering according to the display window size of the preset control end and the image coding data to obtain a target screen frame image. When the received image encoding data is a PNG image, the embodiment of the present invention stores the image matrix data in a local computer memory, so that the pixel values of the corresponding differential pixel points in the image matrix data can be replaced according to the received encoding compression data. Then, the embodiment of the invention immediately performs image scaling and rendering according to the window size of the local computer, so as to display the target screen frame image to the local computer, namely a preset control end.
Referring to fig. 8, fig. 8 is a complete flow chart of a remote desktop screen frame image transmission method according to an embodiment of the invention. A TCP server is deployed in the bastion intranet to realize the forwarding of TCP data, a computer needing remote management starts a client, starts and connects to the TCP server after the acquisition frequency of screen capture is set, generates a 32-bit login key and a computer name, and waits for a preset control end to be accessed. Meanwhile, on the side of the remote computer, the client is started first, after the client logs in the fort machine to pass the authentication, the name and key of the computer to be controlled are input, the TCP server forwards the request to the computer to be controlled, after the key passes the confirmation, the control end computer starts a control window, the controlled end starts to collect the screen image according to the appointed frequency, codes and compresses the screen image and sends the screen image to the TCP server, and the TCP server forwards the screen image to the computer to be controlled. In the process of carrying out remote control on a remote computer through a preset control end, after the remote computer receives an instruction, firstly, carrying out full-screen and full-pixel image acquisition on a remote desktop screen according to the acquired preset acquisition frequency, such as 20-60 frames per second, and the corresponding resolution, so as to obtain a remote desktop screen frame image. The RGB value of each pixel point acquired by the embodiment of the invention is stored through a three-dimensional preset matrix table. Then, the embodiment of the invention judges whether the acquired remote desktop screen frame image is a first frame image. When the acquired remote desktop screen frame image is determined to be the first frame image, the embodiment of the invention performs preset image coding on the first frame image to obtain image coding data. For example, the embodiment of the invention directly encodes the remote desktop screen frame image of the first frame according to the PNG image format, and then sends the encoded remote desktop screen frame image to the preset control end. In addition, when the acquired remote desktop screen frame image is not the first frame image, the embodiment of the invention obtains difference coordinate data by traversing the pixel point value of the remote desktop screen frame image to record the pixel point coordinate data corresponding to the pixel point where the pixel point pixel value of the remote desktop screen frame image and the pixel point pixel value of the previous frame screen image are different. For example, the embodiment of the invention carries out pixel point pixel value traversal comparison on the remote desktop screen frame image obtained currently and the previous frame screen image according to each pixel, thereby recording coordinate values and pixel values inconsistent with the pixel point pixel value of the previous frame screen image. Correspondingly, the embodiment of the invention constructs the image difference data according to the difference coordinate data and the corresponding pixel point pixel value. The difference coordinate data in the image difference data in the embodiment of the invention comprises abscissa data and ordinate data. Further, the embodiment of the invention performs preset encoding compression processing on the image difference data to obtain encoded compressed data. Specifically, in the embodiment of the invention, first bit data of a pre-preset bit number in abscissa data is stored in a first byte, and bit data of a post-preset bit number in the abscissa data is stored in a first bit area of a second byte. Then, the embodiment of the invention stores the bit data of the front preset bit number of the ordinate data into the third byte, and stores the bit data of the rear preset bit number of the ordinate data into the second bit area of the second byte, so as to obtain the fourth byte. Meanwhile, in the embodiment of the present invention, the pixel value of the corresponding pixel point, such as RGB value, is stored in the fifth byte. Then, the embodiment of the invention performs preset compression processing, such as zlib compression processing, according to the first byte, the third byte, the fourth byte and the fifth byte, so as to generate byte stream data, namely encoded compressed data. Likewise, the embodiment of the invention transmits the encoded compressed data to a preset control terminal. It should be noted that, in the preset encoding compression process of the embodiment of the present invention, the manner of storing the abscissa data and the ordinate data into three bytes may be arbitrarily set, and decoding is performed according to the reverse order in the decoding process.
Further, when the preset control end is determined to receive the encoded compressed data, performing preset decoding and restoring processing on the encoded compressed data to obtain restored data. Specifically, in the embodiment of the invention, firstly, preset decompression processing is performed on the encoded compressed data to obtain decompressed data. Then, the embodiment of the invention extracts the first byte, the third byte, the fourth byte and the fifth byte from the decompressed data, decodes the extracted byte data, and restores the extracted byte data to obtain corresponding pixel point coordinate data and pixel point pixel values. Finally, according to the embodiment of the invention, window rendering is carried out at a preset control end according to pixel coordinate data and pixel point pixel values in the restored data, and a target screen frame image is obtained. In addition, when the preset control end receives the image coding data, the embodiment of the invention firstly stores the image coding data to the preset control end. Then, the embodiment of the invention performs image rendering according to the display window size of the preset control end and the image coding data to obtain a target screen frame image.
Referring to fig. 9, an embodiment of the present invention further provides a remote desktop screen frame image transmission system, including:
A first module 210 is configured to obtain a remote desktop screen frame image.
The second module 220 is configured to compare the remote desktop screen frame image with the previous screen image to obtain image difference data. Wherein the last frame of screen image is the previous frame of remote desktop screen frame image.
The third module 230 is configured to perform a preset encoding compression process on the image difference data to obtain encoded compressed data.
A fourth module 240, configured to transmit the encoded compressed data to a preset control terminal.
And a fifth module 250, configured to, when it is determined that the preset control unit receives the encoded compressed data, perform a preset decoding restoration process on the encoded compressed data, and obtain restored data. The preset decoding reduction processing corresponds to the preset encoding compression processing.
And a sixth module 260, configured to perform window rendering at a preset control end according to the restored data, so as to obtain a target screen frame image.
The content of the method embodiment of the invention is suitable for the system embodiment, the specific function of the system embodiment is the same as that of the method embodiment, and the achieved beneficial effects are the same as those of the method. Referring to fig. 10, an embodiment of the present invention further provides a remote desktop screen frame image transmission system, including:
At least one processor 310.
At least one memory 320 for storing at least one program.
The at least one program, when executed by the at least one processor 310, causes the at least one processor 310 to implement the remote desktop screen frame image transmission method as described in the above embodiments.
The content of the method embodiment of the application is suitable for the system embodiment, the specific function of the system embodiment is the same as that of the method embodiment, and the achieved beneficial effects are the same as those of the method.
An embodiment of the present application also provides a computer-readable storage medium storing computer-executable instructions for execution by one or more control processors, for example, performing the remote desktop screen frame image transmission method steps described in the above embodiments.
The content of the method embodiment of the application is suitable for the system embodiment, the specific function of the system embodiment is the same as that of the method embodiment, and the achieved beneficial effects are the same as those of the method.
The terms "first," "second," "third," "fourth," and the like in the description of the application and in the above figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one (item)" means one or more, and "a plurality" means two or more. "and/or" for describing the association relationship of the association object, the representation may have three relationships, for example, "a and/or B" may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
The step numbers in the above method embodiments are set for convenience of illustration, and the order of steps is not limited in any way, and the execution order of the steps in the embodiments may be adaptively adjusted according to the understanding of those skilled in the art.
While the preferred embodiment of the present application has been described in detail, the present application is not limited to the embodiments described above, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present application, and these equivalent modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.
Claims (10)
1. The remote desktop screen frame image transmission method is characterized by comprising the following steps of:
acquiring a remote desktop screen frame image;
comparing the remote desktop screen frame image with a previous screen image to obtain image difference data; wherein the last frame of screen image is the previous frame of the remote desktop screen frame image;
carrying out preset encoding compression processing on the image difference data to obtain encoding compression data;
transmitting the encoded compressed data to a preset control end;
when the preset control end receives the coded compressed data, carrying out preset decoding and restoring treatment on the coded compressed data to obtain restored data; wherein the preset decoding reduction process corresponds to the preset encoding compression process;
And performing window rendering on the preset control end according to the restored data to obtain a target screen frame image.
2. The method for transmitting a remote desktop screen frame image according to claim 1, wherein the acquiring a remote desktop screen frame image includes:
acquiring images of a full screen and full pixels of a remote desktop screen through a preset acquisition frequency to obtain a frame image of the remote desktop screen; the remote desktop screen frame image comprises pixel point coordinate data and pixel point pixel values.
3. The method for transmitting a remote desktop screen frame image according to claim 2, wherein comparing the remote desktop screen frame image with a previous screen image to obtain image difference data comprises:
traversing the pixel value of the pixel point of the remote desktop screen frame image, and recording the pixel point coordinate data corresponding to the pixel point of which the pixel value of the pixel point of the remote desktop screen frame image is different from that of the pixel point of the previous screen image to obtain difference coordinate data;
and obtaining the image difference data according to the difference coordinate data and the corresponding pixel value of the pixel point.
4. A remote desktop screen frame image transmission method according to claim 3, wherein the pixel point coordinate data includes abscissa data and ordinate data;
the performing preset encoding compression processing on the image difference data to obtain encoding compression data comprises the following steps:
storing bit data of a pre-preset bit number in the abscissa data into a first byte;
storing bit data of a later preset bit number in the abscissa data into a first bit area of a second byte; wherein the post preset bit number is the total bit number of the pixel point coordinate data minus the remaining bit number of the pre preset bit number;
storing the bit data of the pre-preset bit number in the ordinate data to a third byte;
storing the bit data of the post preset bit number in the ordinate data to a second bit area of the second byte to obtain a fourth byte;
storing the pixel value of the pixel point to a fifth byte;
performing preset compression processing according to the first byte, the third byte, the fourth byte and the fifth byte to obtain the encoded compressed data; wherein the encoded compressed data comprises byte stream data.
5. The method of claim 1, wherein prior to performing the step of comparing the remote desktop screen frame image with a previous screen image to obtain image difference data, the method further comprises:
when the remote desktop screen frame image is determined to be a first frame image, carrying out preset image coding on the remote desktop screen frame image to obtain image coding data;
and sending the image coding data to the preset control end.
6. The method for transmitting remote desktop screen frame images according to claim 4, wherein said performing a preset decoding and restoring process on the encoded compressed data to obtain restored data includes:
carrying out preset decompression processing on the encoded compressed data to obtain decompressed data; wherein the preset decompression process corresponds to the preset compression process;
and extracting the first byte, the third byte, the fourth byte and the fifth byte from the decompressed data, and restoring the first byte, the third byte and the fourth byte to obtain the pixel point coordinate data.
7. The method of claim 5, further comprising:
when the preset control end is determined to receive the image coding data, storing the image coding data to the preset control end;
and performing image rendering according to the display window size of the preset control end and the image coding data to obtain the target screen frame image.
8. A remote desktop screen frame image transmission system, comprising:
the first module is used for acquiring a remote desktop screen frame image;
the second module is used for comparing the remote desktop screen frame image with the previous screen image to obtain image difference data; wherein the last frame of screen image is the previous frame of the remote desktop screen frame image;
the third module is used for carrying out preset coding compression processing on the image difference data to obtain coding compression data;
a fourth module, configured to transmit the encoded compressed data to a preset control end;
a fifth module, configured to, when it is determined that the preset control unit receives the encoded compressed data, perform preset decoding restoration processing on the encoded compressed data to obtain restored data; wherein the preset decoding reduction process corresponds to the preset encoding compression process;
And a sixth module, configured to perform window rendering on the preset control end according to the restored data, so as to obtain a target screen frame image.
9. A remote desktop screen frame image transmission system, comprising:
at least one processor;
at least one memory for storing at least one program;
when the at least one program is executed by the at least one processor, the at least one processor is caused to implement the remote desktop screen frame image transmission method of any one of claims 1 to 7.
10. A computer storage medium in which a processor-executable program is stored, wherein the processor-executable program, when executed by the processor, is for implementing the remote desktop screen frame image transmission method of any one of claims 1 to 7.
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