CN1178144C - Method for displaying synchronously content of host on client machine - Google Patents
Method for displaying synchronously content of host on client machine Download PDFInfo
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- CN1178144C CN1178144C CNB021260265A CN02126026A CN1178144C CN 1178144 C CN1178144 C CN 1178144C CN B021260265 A CNB021260265 A CN B021260265A CN 02126026 A CN02126026 A CN 02126026A CN 1178144 C CN1178144 C CN 1178144C
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Abstract
The present invention discloses a method for synchronously displaying the content of a host computer on a client computer, which is suitable for the computer field. The present invention has the technical scheme that still images and motion images on the host computer are respectively and synchronously displayed by adopting corresponding processing modes; as for the still images, a screen change interception module adopted at the terminal of the host computer intercepts screen changes and transmits the screen changes to the client computer to be displayed; as for the motion images, a motion image compression module is adopted for compression, and the compressed images are transmitted to the client computer to be displayed after motion image decompression; in addition, the two processing modes can be switched manually or automatically. Thereby, the systematical flexibility is increased; the client computer can synchronously display the still images of the host computer, and fluent motion images can be obtained on the client computer.
Description
Technical field
The present invention relates to computer realm, particularly a kind of method that on client computer, shows the main frame displaying contents synchronously.
Background technology
In the PC that the user uses, desktop computer remains mainstream model, because its powerful, low price at present.But in application, desktop computer also exposes some shortcomings:
A. need a bigger desk-top space to place main frame and display;
B. because main frame, display, keyboard and mouse line are more, be difficult to reach neat and artistic;
C. because the desktop computer stationkeeping, when it requires the user to use desktop computer, need straighten one's clothes and sit properly, not look sideways, office for a long time, the user causes easily and has a pain in the back;
D. because the desktop computer stationkeeping can't realize the pursuit of use-patterns such as the domestic consumer is flexible to PC, convenience, leisure.
When desktop computer was widely popular, many users had selected personal visit equipment (PAD).Easy to carry, the flexible operation of PAD can allow the user handle official business in sofa or the first-class a home from home of bed.But, very limited just because of the function that the portability of PAD can realize it.
In order on PAD, to utilize the power of desktop computer, can be by the communication interface of computing machine, as lan interfaces, wireless lan interfaces, serial line interface, USB (universal serial bus) (USB) interface etc., PAD (as client computer) and desktop computer (as main frame) are coupled together, on client computer, show the main frame displaying contents and utilize host resource to operate, thereby as much as possible the portability of PAD and the powerful processing capacity of desktop computer are combined, for the user provides service.
By application described above as seen, content displayed on the main frame need shown on the client computer synchronously, the method that on client computer, shows the main frame displaying contents in the prior art synchronously, all adopt fixing tupe at any image on the main frame, generally on main frame, adopt an image processing module, after main frame image information or change information compression with the main frame image, be transferred to client computer, show after by client computer image information or image change information being decompressed, satisfied general computer utility.But, under the situation of playing moving images, in some multimedia application such as displaying video image, image data amount is very big, view data is still transmitted continuously in the compression and decompression process, in case compression and decompression have delay in time, will cause the interrupted of client computer demonstration.
In addition, because the performance of current PAD is also lower, the bandwidth of transmit port also is not enough to bear googol according to handling capacity, in this case, if still adopt the synchronous display method of prior art, can't the adaptive video broadcast etc. multimedia application, have a strong impact on the quality of the moving image that the user sees by client computer.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of method that on client computer, shows the main frame displaying contents synchronously, can adapt to multimedia application such as general application and video playback better.
In order to achieve the above object, the invention provides a kind of method that shows the main frame displaying contents on client computer synchronously, client computer is connected by communication port with main frame, it is characterized in that,
The processing mode of rest image and the processing mode of moving image are changed mutually,
At rest image,
In host side, the former frame Still image data and the present frame Still image data of storing compared, if consistent, then do not carry out subsequent operation, if inconsistent, then send Still image data to client computer,
At client-side, receive described Still image data and demonstrate rest image;
At moving image,
In host side, the data of the moving image of current demonstration are compressed, send the compressed moving image data to client computer then,
At client-side, the described compressed moving image data of receiving are decompressed, demonstrate moving image then.
In host side, described to client computer transmission Still image data, further comprise: Still image data is compressed before;
At client-side, the described rest image that demonstrates further comprises before: the Still image data of receiving is decompressed.
In host side, describedly send Still image data to client computer and be: send present frame rest image and former frame rest image data inequality to client computer.
Described inconsistent by the former frame Still image data and the present frame Still image data that relatively draw storage, further comprise afterwards: the Still image data that the former frame Still image data of storage is updated to present frame.
Data to the moving image of current demonstration are carried out boil down to: with the data compression of the moving image of current demonstration is mpeg format.
This method further comprises:
To the incoming event data of main frame transmission client-side, main frame is determined the incoming event of client-side according to the incoming event data of receiving.
Described at the rest image processing mode with at switching between the moving image processing mode:
When the processing mode at rest image switched to processing mode at moving image, host side and client-side stopped the processing to rest image, begin moving image is handled;
When the processing mode at moving image switched to processing mode at rest image, host side and client-side stopped the processing to moving image, begin rest image is handled.
Described switching can be manual switchover, or automaticallyes switch.
Describedly comprise at the rest image processing mode with at the manual switchover process of moving image processing mode:
At client-side switch key is set, client-side is received the incoming event data of pressing switch key, sends described incoming event data to main frame then;
Main frame is according to the described incoming event data received, determines that client-side presses the incoming event of switch key, starts then at the rest image processing mode with at the switching of moving image processing mode.
Monitor the startup of moving image program and close the described automatic switchover of realization by host side.
Described processing mode at rest image realizes that by software described processing mode at moving image realizes by hardware.
A kind of device that on client computer, shows the main frame displaying contents synchronously, described device comprises at least:
In host side,
Screen printing changes module, is used for the former frame Still image data and the present frame Still image data of storage are compared, if inconsistent, then sends Still image data to first data transmission module,
The moving image compression module is used for the data of the moving image of current demonstration are compressed, and sends the compressed moving image data to first data transmission module then,
First modular converter is used for carrying out screen printing according to the signal that receives and changes switching between module and the moving image compression module,
First data transmission module, be used for that the subscribing client end sends, send data from the data of second data transmission module with to client-side;
At client-side,
Second data transmission module, be used to receive that host side sends, send data from the data of first data transmission module with to host side,
The rest image display module is used for demonstrating rest image according to the Still image data of receiving from second data transmission module,
The moving image decompression module, be used for to receive, from second data transmission module, the compressed moving image data decompress, and demonstrate moving image,
Second modular converter is used for carrying out switching between rest image display module and the moving image decompression module according to the signal that receives;
Communication port is used for the data transmission between first data transmission module and second data transmission module.
Described screen printing changes module and comprises:
The view data backup module is used to store the data of former frame rest image, and sends to the view data comparison module;
The view data interception module is used to intercept the data of present frame rest image, and sends to the view data comparison module;
The view data comparison module is used for the data of the present frame rest image that will receive and the data of former frame rest image and compares, if inconsistent, then sends Still image data to first data transmission module.
In host side, described screen printing changes module and further comprises:
Image data compression module, between the view data comparison module and first data transmission module, be used to receive Still image data from the view data comparison module, and described Still image data compressed, send to second data transmission module by first data transmission module then;
At client-side, described rest image display module comprises:
The view data decompression module, be used for to receive, from second data transmission module, the compression Still image data decompress, send to the view data display module then;
The view data display module is used for demonstrating rest image according to the Still image data of receiving.
This device further comprises:
At client-side,
User's load module is used to receive user's incoming event data, and sends to first data transmission module by second data transmission module;
In host side,
User's incoming event analog module is used for determining user's incoming event of client-side according to the incoming event data of receiving from first data transmission module.
Described moving image compression module comprises at least: hardware-compressed card or hardware-compressed chip;
Described moving image decompression module comprises at least: hardware decompresses and blocks or hardware decompression chip.
The present invention is directed to the processing mode that the rest image on the main frame adopts screen printing to change because the Still image data amount this is just very little, intercepting be again the data of rest image changing unit, so data volume is relatively just littler.What compression process was carried out is lossless compress, has kept all information of original image, therefore guaranteed obtain on the client computer be with main frame on same rest image quality.At the processing mode that the moving image on the main frame adopts moving image to compress, the capture movement image reduces data processing amount and transmission quantity, thereby can guarantee real-time better well.Switching between the different images processing mode can be by manually or automatically carrying out, and is very flexible, both can satisfy the demand of user to the rest image quality, can satisfy the user shows the host motion image synchronously by client computer needs again.
Description of drawings
Fig. 1 is according to image processing apparatus synoptic diagram of the present invention;
Fig. 2 is according to rest image processing module synoptic diagram of the present invention;
Fig. 3 is according to moving image processing module synoptic diagram of the present invention;
Fig. 4 is the manual switchover process flow diagram according to rest image pattern-moving image mode of the present invention;
Fig. 5 is the automatic switchover process flow diagram according to rest image pattern-moving image mode of the present invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Core of the present invention is to adopt the processing mode that adapts with it respectively at rest image that shows on the main frame and moving image, thereby realizes the synchronous demonstration of main frame and client computer.
Content displayed can be divided into two types of rest image and moving images according to the motion state of picture material on the main frame.So-called rest image is meant user interface in the general computer utility, still picture etc., so-called moving image is to the motion scenery image of picked-up continuously, is made up of the image of a frame one frame, as film, video conferencing etc.
In image data transmission, generally will transmit again after the Image Data Compression, can significantly reduce the transmission of data volume like this.Because the data volume of moving image will be far longer than rest image, be applicable to the compression method that on client computer, shows the main frame rest image synchronously, to showing synchronously that on client computer the host motion image just seems unable to do what one wishes.Each width of cloth rest image is exactly a two field picture, needs the data volume handled very little in compression, therefore is easy to guarantee the quality of the rest image that the user sees by client computer.Yet moving image is made up of the image of a frame one frame, and data volume is very big, is easy to cause client computer to show interrupted phenomenon.
In fact, in the prior art under the video playback situation client computer show interrupted problem, be because all images data of main frame all adopt with a kind of processing mode transmits and bring to client computer.And the present invention is directed to the characteristics of rest image and moving image, adopt the processing mode that adapts with it respectively, and then give client computer, thereby can better realize the synchronous demonstration of main frame and client computer image data transmission.
Preferably, at the method for rest image employing software screenshotss technique intercepts screen change, adopt the method for the full frame compression of hardware at moving image.Fig. 1 is according to image processing apparatus synoptic diagram of the present invention, as shown in Figure 1, host side 105 comprises: screen printing variation module 101 is used for the Still image data of screen printing variation and compresses, moving image compression module 104 is used for the full frame compression of host side screen present displayed content, user's incoming event analog module 102 is used to simulate the user's incoming event from client-side, and first data transmission module 103 is used for sending the view data after the compression to client computer and receives incoming event data from client computer; Client-side 110 comprises: the Still image data decompress(ion) that rest image display module 107 is used for the screen change that will receive contracts and shows, the motion image data decompress(ion) that moving image decompression module 108 is used for receiving contracts and shows, user's load module 109 is used to obtain user's incoming event, and second data transmission module 106 is used for receiving from the view data of main frame and with the incoming event data of user's load module 109 and sends main frame to.
Be described in detail the transmission course of data under two kinds of processing modes below respectively.
When on client computer, showing the rest image on the main frame synchronously, adopt a screen printing to change module 101 screen printings in host side and change, be transferred to client computer and show.Screen printing changes in module 101 and the rest image display module 107 and also comprises the function module of refinement more, the functional module of its refinement as
Shown in Figure 2:
The screen printing of host side 105 changes module 101 and also comprises: view data interception module 204 is used to intercept the present frame Still image data to the display-memory mapping, view data backup module 201 is used for the former frame Still image data of real-time storage to the display-memory mapping, view data comparison module 202 is used for the Still image data in the Still image data of view data interception module 204 and the view data backup module 201 is compared, image data compression module 203 is used for the data after the image data compression module comparison are carried out lossless compress, gives first data transmission module 103 then and transmits.The rest image display module 107 of client-side 110 also comprises: the view data that view data decompression module 206 is used for second data transmission module 106 is received decompresses, and the screen rest image that view data display module 205 is used for changing shows on client computer.
The above function that realizes for each module, the transmission course of its Still image data is: at client-side 110, the user operates host side 105 content displayed, as revise document content etc., after user's load module 109 captures user's incoming event, send the incoming event data to second data transmission module 106.Second data transmission module 106 is sent to first data transmission module 103 by network service or USB interface with the incoming event data.After user's incoming event analog module 102 is received incoming event data from first data transmission module 103, the simulation of user's incoming event is caused the operation of central processing unit (CPU), content displayed changes on the host side 105, the rest image that view data interception module 204 intercepting current screens show.The Still image data of former frame compares in view data comparison module 202 in the Still image data of the current screen demonstration that view data interception module 204 is intercepted and the view data backup module 201 then, view data comparison module 202 judges whether two Still image data are identical, if identically just do not carry out subsequent operation, to avoid repetitive operation, reduce main frame and the direct data quantity transmitted of client computer to identical data; If inequality, the Still image data after just will comparing is sent to image data compression module 203.Can view data comparison module 202 be compared the Still image data in Still image data in the view data interception module 204 and the view data backup module 201 by certain time interval is set.After Still image data relatively finished, view data backup module 201 was updated to content in the view data interception module 204 with memory contents.Image data compression module 203 is delivered to first data transmission module 103 after with the Still image data lossless compress.First data transmission module 103 is sent to second data transmission module 106 by network service or USB interface with the Still image data of compressing.Second data transmission module 106 is sent to view data decompression module 206 with the Still image data of compressing and decompresses.View data display module 205 receives the Still image data after decompressing and shows.So far, realized that client computer shows the method for rest image on the main frame synchronously.
When on client computer, showing synchronously the moving image on the main frame, compress, be transferred to client computer and carry out the moving image back of decompressing and show in the current content that host side adopts a moving image compression module to show on to main frame.In order to realize this processing mode, adopt a hardware-compressed card or compression chip in host side, correspondingly adopt a hardware to decompress at client-side and block or the decompression chip, the hardware-compressed card is conciliate compressing card and is used for real-time compression and decompression.Its module diagram is as shown in Figure 3:
When client computer showed moving image synchronously, the transmission course of motion image data was: at client-side 110, after user's load module 109 captures user's incoming event, the incoming event data are sent to second data transmission module 106; Second data transmission module 106 is sent to first data transmission module 103 by network service or USB interface with the incoming event data; User's incoming event analog module 102 is simulated user's incoming event after receiving incoming event data from first data transmission module 103; Moving image compression module 104 adopts hardware that the main frame screen display content is carried out full frame compression then, and the motion image data after the compression is sent to first data transmitting module 103; First data transmission module 103 is sent to second data transmission module 106 by network service or USB interface with the compressed moving image data; Second data transmission module 106 is delivered to moving image decompression module 108 with the compressed moving image data and is decompressed, and on the client computer moving image on the main frame is being restored.So far, realized that client computer shows the method for moving image on the main frame synchronously.
When not being strict especially to the rest image quality requirements, it also is very feasible adopting moving image compress technique compression main frame desktop picture, it can capture all changes of main frame screen, to guarantee at all displaying contents that intactly demonstrate on the client computer on the main frame screen.
Adopt the method for different disposal mode, the present invention that switching between two kinds of processing modes also is provided based on above-mentioned respectively at rest image on the main frame and moving image: to comprise manual switchover and automatic switchover, to increase the dirigibility of system.
The manual switchover mode is to realize by synchronous demonstration rest image to the switching that shows moving image synchronously by a switching key (or button) is set at client-side.Fig. 4 is the manual switchover process flow diagram according to rest image pattern-moving image mode of the present invention, and as shown in Figure 4, the manual switchover implementation procedure of rest image pattern-moving image mode may further comprise the steps at least:
Step 401: the processing mode that shows rest image synchronously is the mode that the client computer of system default shows the main frame displaying contents synchronously, this moment the user show the rest image that shows on the main frame synchronously by client computer, as the office etc.
Step 402～step 405: when the user needed to show the moving image that shows on the main frame synchronously, the user pressed switching key (or button); After user's load module is received handover information, handover information is sent to second data transmission module, second data transmission module is sent to main frame with the handover information of receiving by network service or USB interface, client-side is closed and is used for the corresponding module that rest image is handled, and starts the moving image decompression module.
Step 406～step 407: after first data transmission module is received handover information, be sent to user's incoming event analog module, user's incoming event analog module is according to the handover information of receiving, the user is simulated by the incoming event of switching key (or button), host side is closed and is used for the corresponding module that rest image is handled then, and start the moving image compression module, enter the processing mode that client computer shows moving image on the main frame synchronously.
Step 408～step 411: the moving image on the main frame finishes, the user presses switching key (or button), user's load module is received handover information, handover information is sent to second data transmission module, second data transmission module is sent to main frame with handover information by network service or USB interface, while client-side closing movement image decompressor module, and start the corresponding module that is used for the rest image processing.
Step 412～step 413: after first data transmission module is received handover information, user's incoming event analog module is according to the handover information of receiving, the user is simulated by the incoming event of switching key (or button), host side closing movement image compression module then, and starting the corresponding module that is used for the rest image processing, the client computer of getting back to system default shows the processing mode of rest image on the main frame synchronously.
Have a look automatic switching mode below, automatic switching mode is to utilize main frame to catch the startup of moving image playing program and close, and then handover information is sent to client computer, realizes by synchronous demonstration rest image to the switching of demonstration moving image synchronously.Fig. 5 is the automatic switchover process flow diagram according to rest image pattern-moving image mode of the present invention, and as shown in Figure 5, the automatic switchover implementation procedure of rest image pattern-moving image mode may further comprise the steps at least:
Step 501: the processing mode that shows rest image synchronously is the mode that the client computer of system default shows the main frame displaying contents synchronously, and this moment, the user showed rest image on the main frame synchronously by client computer, as office etc.
Step 502～step 505: after starting the moving image playing program, main frame captures the moving image playing program and moves, host side is closed and is used for the corresponding module that rest image is handled, and starting the moving image compression module, first data transmission module information that will start the moving image decompression module is sent to client computer by network service or USB interface then.
Step 506～step 507: after second data transmission module is received the information that starts the moving image decompression module, client-side is closed and is used for the corresponding module that rest image is handled, and start the moving image decompression module, enter the processing mode that client computer shows moving image on the main frame synchronously.
Step 508～step 511: behind the closing movement image playing program, main frame captures the moving image playing program and cuts out, host side closing movement image compression module, and starting the corresponding module that is used for the rest image processing, first data transmission module is sent to client computer with the information of closing movement image decompressor module by network service or USB interface then.
Step 512～step 513: after second data transmission module is received the information of closing movement image decompressor module, client-side closing movement image decompressor module, and starting the corresponding module that is used for the rest image processing, the client computer of getting back to system default shows the processing mode of rest image on the main frame synchronously.
In system, manual switchover mode and automatic switching mode can simultaneously and be deposited, and by the needs of user according to operation, select corresponding switching mode, to realize the dirigibility and the convenience of system.
In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (16)
1, a kind of method that on client computer, shows the main frame displaying contents synchronously, client computer is connected by communication port with main frame, it is characterized in that,
The processing mode of rest image and the processing mode of moving image are changed mutually,
At rest image,
In host side, the former frame Still image data and the present frame Still image data of storing compared, if consistent, then do not carry out subsequent operation, if inconsistent, then send Still image data to client computer,
At client-side, receive described Still image data and demonstrate rest image;
At moving image,
In host side, the data of the moving image of current demonstration are compressed, send the compressed moving image data to client computer then,
At client-side, the described compressed moving image data of receiving are decompressed, demonstrate moving image then.
2, method according to claim 1 is characterized in that,
In host side, described to client computer transmission Still image data, further comprise: Still image data is compressed before;
At client-side, the described rest image that demonstrates further comprises before: the Still image data of receiving is decompressed.
3, method according to claim 1 and 2 is characterized in that, in host side, describedly sends Still image data to client computer and is: send present frame rest image and former frame rest image data inequality to client computer.
4, method according to claim 1, it is characterized in that, described inconsistent by the former frame Still image data and the present frame Still image data that relatively draw storage, further comprise afterwards: the Still image data that the former frame Still image data of storage is updated to present frame.
5, method according to claim 1 is characterized in that, the data of the moving image of current demonstration are carried out boil down to: with the data compression of the moving image of current demonstration is mpeg format.
6, method according to claim 1 is characterized in that, this method further comprises:
To the incoming event data of main frame transmission client-side, main frame is determined the incoming event of client-side according to the incoming event data of receiving.
7, method according to claim 1 is characterized in that, and is described at the rest image processing mode with at being converted between the moving image processing mode:
When the processing mode at rest image switched to processing mode at moving image, host side and client-side stopped the processing to rest image, begin moving image is handled;
When the processing mode at moving image switched to processing mode at rest image, host side and client-side stopped the processing to moving image, begin rest image is handled.
8, according to claim 1 or 7 described methods, it is characterized in that described switching can be manual switchover, or automatically switch.
9, method according to claim 8 is characterized in that, describedly comprises at the rest image processing mode with at the manual switchover process of moving image processing mode:
At client-side switch key is set, client-side is received the incoming event data of pressing switch key, sends described incoming event data to main frame then;
Main frame is according to the described incoming event data received, determines that client-side presses the incoming event of switch key, starts then at the rest image processing mode with at the switching of moving image processing mode.
10, method according to claim 8 is characterized in that, monitors the startup of moving image program and closes the described automatic switchover of realization by host side.
11, method according to claim 1 is characterized in that, described processing mode at rest image realizes that by software described processing mode at moving image realizes by hardware.
12, a kind of device that shows the main frame displaying contents on client computer synchronously is characterized in that described device comprises at least:
In host side,
Screen printing changes module, is used for the former frame Still image data and the present frame Still image data of storage are compared, if inconsistent, then sends Still image data to first data transmission module,
The moving image compression module is used for the data of the moving image of current demonstration are compressed, and sends the compressed moving image data to first data transmission module then,
First modular converter is used for carrying out screen printing according to the signal that receives and changes switching between module and the moving image compression module,
First data transmission module, be used for that the subscribing client end sends, send data from the data of second data transmission module with to client-side;
At client-side,
Second data transmission module, be used to receive that host side sends, send data from the data of first data transmission module with to host side,
The rest image display module is used for demonstrating rest image according to the Still image data of receiving from second data transmission module,
The moving image decompression module, be used for to receive, from second data transmission module, the compressed moving image data decompress, and demonstrate moving image,
Second modular converter is used for carrying out switching between rest image display module and the moving image decompression module according to the signal that receives;
Communication port is used for the data transmission between first data transmission module and second data transmission module.
13, device according to claim 12 is characterized in that, described screen printing changes module and comprises:
The view data backup module is used to store the data of former frame rest image, and sends to the view data comparison module;
The view data interception module is used to intercept the data of present frame rest image, and sends to the view data comparison module;
The view data comparison module is used for the data of the present frame rest image that will receive and the data of former frame rest image and compares, if inconsistent, then sends Still image data to first data transmission module.
14, device according to claim 13 is characterized in that,
In host side, described screen printing changes module and further comprises:
Image data compression module, between the view data comparison module and first data transmission module, be used to receive Still image data from the view data comparison module, and described Still image data compressed, send to second data transmission module by first data transmission module then;
At client-side, described rest image display module comprises:
The view data decompression module, be used for to receive, from second data transmission module, the compression Still image data decompress, send to the view data display module then;
The view data display module is used for demonstrating rest image according to the Still image data of receiving.
15, device according to claim 12 is characterized in that, this device further comprises:
At client-side,
User's load module is used to receive user's incoming event data, and sends to first data transmission module by second data transmission module;
In host side,
User's incoming event analog module is used for determining user's incoming event of client-side according to the incoming event data of receiving from first data transmission module.
16, device according to claim 12 is characterized in that,
Described moving image compression module comprises at least: hardware-compressed card or hardware-compressed chip;
Described moving image decompression module comprises at least: hardware decompresses and blocks or hardware decompression chip.
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| CN102143360B (en) * | 2010-06-30 | 2013-08-07 | 华为技术有限公司 | Image coding method and device |
| CN103677697B (en) * | 2012-09-10 | 2019-03-29 | 联想(北京)有限公司 | A kind of information processing method and a kind of electronic equipment |
| WO2015012296A1 (en) * | 2013-07-23 | 2015-01-29 | スカラ株式会社 | Transmission-side computer, reception-side computer, and method and computer program executed by said computers |
| CN106375841B (en) * | 2015-07-23 | 2020-02-11 | 阿里巴巴集团控股有限公司 | Wireless screen projection data processing method, wireless screen projection data processing device, wireless screen projection video data display method, wireless screen projection video data display device and electronic equipment |
| CN107507475B (en) * | 2017-07-27 | 2020-06-16 | 北京华文众合科技有限公司 | Central control system, interactive teaching system and method |
| CN109922301A (en) * | 2019-03-18 | 2019-06-21 | 广州兰德视讯有限公司 | The method and device of data conferencing picture quality is improved in video conference |
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