CN101977322A - Screen coding system based on universal video coding standard - Google Patents
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Abstract
The invention relates to a screen coding system based on universal video coding standard, belonging to the technical field of video image processing. The system comprises a screen information acquiring module, a color space conversion module and an improved universal coder, wherein the screen information acquiring module is connected with the color space conversion module and transmits an original screen image and variant region information; the color space conversion module is connected with the improved universal coder, transmits variant region information and codes an input image; and the improved universal coder outputs the coded and compressed data. The system can effectively reduce the occupancy rate of a CPU.
Description
Technical field
What the present invention relates to is a kind of system of technical field of video image processing, specifically is a kind of screen coding system based on the generic video coding standard.
Background technology
At aspects such as the computer remote Web-based instruction, supervisory control system, Web conferences, the computer screen video compression is a kind of important link, because screen picture resolution is higher, and the content complexity, screen picture is higher to network bandwidth requirement.Video coding is meant the method that the digital video frequency flow sequence is deposited with data bit still less, and the coding of screen video is meant that hereinafter to be referred as screen coding the digital video frequency flow sequence is produced by screen picture.This technology can reduce effectively needs data quantity transmitted, thereby reduces the pressure to network.
Compare with ordinary video, screen video has the resolution height, changes characteristics such as not remarkable between frame and the frame.And the generic video coding standard is considered in the general video, and picture material and object of which movement are very complicated, and the generic video coding standard provides abundant tool of compression, therefore in order to reach compression effectiveness preferably, needs a large amount of calculating usually.If the generic video coding standard is directly used in screen coding, can take a large amount of CPU times, be applied to real-time live scene especially, high like this CPU usage is difficult to accept.
So at the screen video compression, the special-purpose screen video coding method of sampling is compressed usually.But the screen coding method has bigger limitation to the screen video content, and violent when the screen picture variation, when particularly playing one section video, compression effectiveness will variation.
Find through literature search prior art, remote desktop method for synchronous under the patent general environment of Chinese patent literature CN101014127A has proposed a kind of based on the motion prediction that changes subregion and the screen video encoding scheme of compensation, this scheme has certain advantage, but the lasting variation acute variation of screen picture can cause compression ratio to descend, and using has certain limitation.
Summary of the invention
The present invention is directed to the prior art above shortcomings, a kind of screen coding system based on the generic video coding standard is provided, can effectively reduce CPU usage.
The present invention is achieved by the following technical solutions, the present invention includes: screen message acquisition module, color-space conversion module and modified model universaling coder, wherein: the screen message acquisition module is connected with color-space conversion module and transmits original screen picture and region of variation information, color-space conversion module is connected with the modified model universaling coder and transmits region of variation information and encoding input image, the data after the compression of modified model universaling coder output encoder.
Described encoding input image is meant: the image that meets modified model universaling coder input picture call format;
Described screen message acquisition module is used for obtaining current screen image information and region of variation information from computer display sub-system, and wherein: region of variation information is meant: the current screen image of being described by the coordinate of rectangle is compared the zone that minimum boundary rectangle surrounded of the image-region that the pixel that changes forms with the former frame image.
Described color-space conversion module is used for that the original screen picture that the screen message acquisition module obtains carried out color space conversion and exports the image that a width of cloth meets improved encoder input picture call format based on the generic video coding standard;
Described generic video coding standard is meant: image is cut into the block of pixels of specifying size, and promptly macro block is that unit carries out encoding compression with the macro block; And support to encode with the compression molding of " skipping ", the former frame image that promptly ought compress exists and the on all four macro block of current macro content, it is predicted macroblock, predicted macroblock is identical with current macro position in image, when this current macro block of compression, only write down the sign of positional information He " skipping " pattern of predicted macroblock, do not write down other information about current macro.
Described modified model universaling coder is used for encoding input image is carried out encoding compression and exports packed data, this modified model universaling coder comprises: based on the encoder of generic video coding standard and one newly-increased be embedded in " skipping " pattern fast detecting unit in the generic video encoder, wherein: " skipping " pattern fast detecting unit, be used for the macro block in region of variation not, promptly do not change macro block, directly select " skipping " pattern for it and compress.
The present invention can solve when in the screen during displaying video, uses traditional relatively poor problem of screen own coding scheme compression effectiveness, and compares when using generic video coding standard encoder to carry out screen coding, and this system can effectively reduce CPU usage.System of the present invention can be widely used in fields such as the computer remote Web-based instruction, supervisory control system, Web conference, computer remote control system.
Description of drawings
Fig. 1 is a system construction drawing of the present invention.
Fig. 2 is a system construction drawing among the embodiment 2.
Fig. 3 is the operation chart of color-space conversion module among the embodiment 2.
Fig. 4 is the operational flowchart of improved h.264 generic video encoder among the embodiment 2.
Embodiment
Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
As shown in Figure 1, present embodiment comprises: screen message acquisition module 110, color-space conversion module 120 and modified model universaling coder 130, wherein: screen message acquisition module 110 is connected with color-space conversion module 120 and transmits original screen picture 101 and region of variation information 102, color-space conversion module is connected with the modified model universaling coder, and transmission region of variation information, and one the width of cloth meet the image of modified model universaling coder input picture call format, be designated hereinafter simply as encoding input image 103, the data 104 after the compression of modified model universaling coder output encoder.
Described screen message acquisition module 110 is used for obtaining current screen image information and region of variation information 102 from computer display sub-system, and wherein: region of variation information 102 is meant: the current screen image of being described by the coordinate of rectangle is compared the zone that minimum boundary rectangle surrounded of the image-region that the pixel that changes forms with the former frame image.
Described color-space conversion module 120 is used for that the original screen picture that screen message acquisition module 110 obtains carried out color space conversion and exports the image that a width of cloth meets improved encoder input picture call format based on the generic video coding standard, this generic video coding standard is meant: at first image is cut into the block of pixels of specifying size, it is macro block, with the macro block is that unit carries out encoding compression, encode with the compression molding of " skipping " then, the former frame image that promptly ought compress exists and the on all four macro block of current macro content, it is predicted macroblock, and predicted macroblock is identical with current macro position in image, when this current macro block of compression, only write down the sign of positional information He " skipping " pattern of predicted macroblock, do not write down other information about current macro.
Described modified model universaling coder 130 is used for encoding input image is carried out encoding compression and exports packed data, this modified model universaling coder 130 comprises: based on the encoder of generic video coding standard and one newly-increased be embedded in " skipping " pattern fast detecting unit in the generic video encoder, wherein: " skipping " pattern fast detecting unit, be used for the macro block in region of variation not, promptly do not change macro block, directly select " skipping " pattern for it and compress.
In screen coding system based on the universal coding standard, screen message acquisition module 110 at first obtains information such as current screen image and region of variation, these information are put into buffering area, and color-space conversion module 120, from buffering area, take out screen picture, carry out the conversion of color space according to region of variation information 102, output meets the improved image that requires based on the encoder pattern of the input of generic video coding standard, be so-called encoding input image, modified model universaling coder 130 utilizes region of variation that encoding input image is compressed.Comprise " skipping " pattern device for fast detecting 131 in the generic video encoder, its effect is the region of variation that provides according to screen message acquisition module 110, judge current macro whether compress by available " skipping " pattern fast, promptly, all should directly use " skipping " pattern for the macro block in region of variation not.At last, the data output after the generic video encoder will compress.Above process is called screen recording.
Embodiment 2
An embodiment of the screen coding system of the universal coding standard that is based on as shown in Figure 2, this embodiment system uses the Mirror Driver mechanism under the Windows operating system to obtain screen message, adopts the generic video coding standard h.264 the video that the screen picture sequence forms to be compressed.H.264 standard cuts into size with video image and compresses for the macro block of 16*16, and comprises the situation that a kind of P_Skip pattern represents that current macro is identical with the predicted macroblock content.
The form of Windows operating system screen picture is colored bitmap, is called rgb format; The present embodiment system adopts senior abridged table high profile h.264, and the input image colors form of this abridged table support is YUV, so color-space conversion module 120 is responsible for converting RGB to YUV.
This embodiment system comprises following 5 modules: Mirror driver screen message acquisition module 221, RGB be to YUV modular converter 222, improved h.264 generic video encoder 223, timer 224 and user interface 225.Timer wherein is used to control the screen coded system and carries out screen recording according to specified frequency, up to artificial end screen recording process.User interface wherein makes the user can specify the parameter of screen coding and the beginning and the end of control screen recording.
At first, obtain screen message by Mirror driver screen message acquisition module 221, comprise screen picture, region of variation also comprises the resolution and the color format of current screen.
The resolution of computer screen is 1024*768 or higher, before obtaining screen picture, system can be automatically change the resolution of screen into 800*600, and this is that data volume is too big in the cataloged procedure, when screen recording finished, original value can be returned the resolution adjustment to automatically by system.The color format of obtaining is generally 32 RGB bitmaps, is specially 32 BGRA.
The embodiment system uses Mirror Driver to obtain screen message, and Mirror Driver is that Windows provides a kind of virtual display driver technology, and physical operations on practical video equipment such as the display screen is simulated at a slice memory headroom.Therefore can obtain screen picture rectangle region of variation accurately by this mechanism.The embodiment system will change 16 rectangular sub-regions territories that screen picture is cut into 4*4, and each rectangular area is obtained minimum rectangle region of variation respectively, and each rectangle region of variation has 16 groups of coordinates altogether by the coordinate representation in the upper left corner and the lower right corner.
It is the encoder x264 that increase income of the h.264 standard followed that the embodiment system selects universaling coder 130 for use, and this encoder speed is fast, and compression effectiveness is good, is widely used in field of video encoding, and the input image colors space of this encoder support is specially YUV420.Therefore, RGB converts the screen picture of BGRA form to the YUV modular converter encoding input image of YUV420 form.As shown in Figure 3, during operation, the pixel in the region of variation is carried out color space conversion Fig. 3 a, and these pixels are copied to relevant position Fig. 3 b of former frame image, cover because of the invalid administrative division map 3c of variation.
X.264 video encoder comprises following main modular:
1) macro block cutting device is used for input picture is cut into the pixel macroblock of 16*16.
2) frame type determining device is judged the frame type of image to be encoded.In x264, three kinds of frame types are arranged, key frame is called the I frame, and the single directional prediction frame is called the P frame, bi-directional predicted frames B frame.Consider present embodiment mainly towards real-time application, so the function of B frame is closed.The module that wherein, can not comprise " skipping P_Skip " pattern in the I frame.X264 judges according to image change degree scenecut and default set of pictures length GOP whether present image is crucial I frame.The present embodiment system establishes scenecut=40, GOP=100.
3) compact model decision-making device is used to judge the compact model of current macro.Wherein comprise " skipping P_Skip " pattern device for fast detecting, its effect is the region of variation that provides according to screen message acquisition module 110, judge current macro whether compress by available " skipping P_Skip " pattern fast, promptly, all should directly use " skipping P_Skip " pattern for the macro block in region of variation not.
4) compressor reducer be used for carrying out data compression according to the predictive mode of selecting, and the data after will compressing is write as a video file.
As shown in Figure 4, encoding input image carries out after macro block cutting and the frame type judgement, carry out the selection of compact model by the compact model decision-making device, if this frame is not a key frame, then at first by " skipping " pattern device for fast detecting according to region of variation information 102, detect current macro and whether be arranged in region of variation, when macro block not in region of variation, be its selection pattern of " skipping P_Skip ".For the macro block in the region of variation, the macro block compact model decision-making device of x264 can be selected suitable compact model for it.For key frame, x264 compact model decision-making device will carry out mode decision according to the strategy of acquiescence.At last, compressor reducer carries out data compression according to compact model, and the data after will compressing are write as a video file.
Present embodiment has increased " skipping P_Skip " pattern fast detecting module on the basis of generic video encoder x264, this module utilizes 102 pairs of unconverted macro blocks of region of variation information to carry out the high-speed decision of compact model.For color-space conversion module 120, present embodiment utilizes region of variation information 102, has reduced the image-region that need carry out color space conversion.Therefore, the present embodiment system with respect to do not use region of variation information 102 generally based on the screen recording system of universaling coder 130, operand has significantly and reduces.
Be configured in CPU core 2duo2.0GHz, using the operating position of the CPU of this screen recording system of vTune9.0 test run on the notebook computer of internal memory 1G.The data that obtain show, color space conversion after utilizing region of variation to be optimized and encoding operation time are compared with the operating time that does not have to optimize, the cpu clock number that takies has reduced 99.58% and 54.84% respectively, and the cpu clock number that whole system takies has reduced 62%.XP provides in addition, contains the CPU usage based on x264 screen recording system of " skipping " pattern fast detecting, also never improve system 44% be reduced to 25%.
Above-mentioned experimental result shows, based on the screen coding system of generic video coding standard, when using generic video coding standard encoder to carry out screen coding, this system can effectively reduce CPU usage.
Claims (6)
1. screen coding system based on the generic video coding standard, it is characterized in that, comprise: screen message acquisition module, color-space conversion module and modified model universaling coder, wherein: the screen message acquisition module is connected with color-space conversion module and transmits original screen picture and region of variation information, color-space conversion module is connected with the modified model universaling coder and transmits region of variation information and encoding input image, the data after the compression of modified model universaling coder output encoder.
2. the screen coding system based on the generic video coding standard according to claim 1 is characterized in that described encoding input image is meant: the image that meets modified model universaling coder input picture call format.
3. the screen coding system based on the generic video coding standard according to claim 1, it is characterized in that, described screen message acquisition module is used for obtaining current screen image information and region of variation information from computer display sub-system, and wherein: region of variation information is meant: the current screen image of being described by the coordinate of rectangle is compared the zone that minimum boundary rectangle surrounded of the image-region that the pixel that changes forms with the former frame image.
4. the screen coding system based on the generic video coding standard according to claim 1, it is characterized in that described color-space conversion module is used for that the original screen picture that the screen message acquisition module obtains carried out color space conversion and exports the image that a width of cloth meets improved encoder input picture call format based on the generic video coding standard.
5. according to the described screen coding system of above-mentioned arbitrary claim based on the generic video coding standard, it is characterized in that, described generic video coding standard is meant: image is cut into the block of pixels of specifying size, and promptly macro block is that unit carries out encoding compression with the macro block; And support to encode with the compression molding of " skipping ", the former frame image that promptly ought compress exists and the on all four macro block of current macro content, it is predicted macroblock, predicted macroblock is identical with current macro position in image, when this current macro block of compression, only write down the sign of positional information He " skipping " pattern of predicted macroblock, do not write down other information about current macro.
6. the screen coding system based on the generic video coding standard according to claim 1 and 2, it is characterized in that, described modified model universaling coder is used for encoding input image is carried out encoding compression and exports packed data, this modified model universaling coder comprises: based on the encoder of generic video coding standard and one newly-increased be embedded in " skipping " pattern fast detecting unit in the generic video encoder, wherein: " skipping " pattern fast detecting unit, be used for the macro block in region of variation not, promptly do not change macro block, directly select " skipping " pattern for it and compress.
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| CN105677279A (en) * | 2016-01-08 | 2016-06-15 | 全时云商务服务股份有限公司 | Desktop area sharing method and system and corresponding sharing terminal and watching terminal |
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| CN109309867A (en) * | 2017-07-28 | 2019-02-05 | 中兴通讯股份有限公司 | Display methods, display terminal and the computer readable storage medium of terminal |
| CN111741093A (en) * | 2020-06-12 | 2020-10-02 | 喻军 | Screen-based data transmission method, screen-based data reception device, screen-based data setting system, and readable storage medium |
| CN111953986A (en) * | 2020-07-23 | 2020-11-17 | 西安万像电子科技有限公司 | Image processing method and device |
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| CN102821278B (en) * | 2012-07-27 | 2015-03-11 | 深信服网络科技（深圳）有限公司 | Remote desktop image transmission method and remote desktop image transmission system |
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| CN106534859B (en) * | 2015-09-11 | 2021-01-15 | 中兴通讯股份有限公司 | Image transmission method and device based on SPICE protocol |
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| CN106681679A (en) * | 2017-01-19 | 2017-05-17 | 深圳市云点科技有限公司 | Transmission method and device of remote desktop picture |
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| CN111741093A (en) * | 2020-06-12 | 2020-10-02 | 喻军 | Screen-based data transmission method, screen-based data reception device, screen-based data setting system, and readable storage medium |
| CN111741093B (en) * | 2020-06-12 | 2023-06-30 | 喻军 | Screen-based data transmitting method, receiving device, setting system and readable storage medium |
| CN111953986A (en) * | 2020-07-23 | 2020-11-17 | 西安万像电子科技有限公司 | Image processing method and device |
| CN115955573A (en) * | 2023-03-15 | 2023-04-11 | 广州思涵信息科技有限公司 | Real-time remote synchronous projection method for two-dimensional image |
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Application publication date: 20110216 |