CN101668192B - Method for transmitting images with large data volume in real time based on C/S mode - Google Patents
Method for transmitting images with large data volume in real time based on C/S mode Download PDFInfo
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Abstract
The invention relates to computer image processing technology, in particular to a method for transmitting images with large data volume in real time based on a C/S mode. The method comprises the following steps: segmenting an image required to be transmitted in real time into a plurality of data blocks at an image transmitting terminal; transmitting the data blocks to an image receiving terminal by a transmitting thread; receiving the data blocks by a receiving thread of the image receiving terminal; recombining the data blocks into an original image; transmitting synchronous information to the image transmitting terminal according to a predetermined transmitting time interval; and continuing transmitting the image until finishing transmitting. In the method adopted, real-time transmission of images can be implemented through network communication completely without compressing or using hardware for real-time image transmission, in particular images with the large data volume; and the advantage is more remarkable for a program production and broadcast system in the field of radio and television.
Description
Technical field
The present invention relates to computer image processing technology, be specifically related to a kind of method based on the C/S model transmitting images with large data volume in real time.
Background technology
In the TCP/IP network application, the Main Patterns of two process interphase interactions of communication is customer end/server mode, i.e. C/S (Client/Server) pattern.In this pattern, user end to server is filed a request, and after server receives request, provides corresponding service.It is mainly used in the fields such as message communicating, file transfer, image transmitting.Image transmitting divides again two kinds of compression domain and uncompressed domains, and the former does image first the preliminary treatment such as compression, and data volume is reduced, and the image after then will compressing transmits, to reach the purpose of carrying out in real time image transmitting; Latter directly transmits image, when the data volume of image is smaller, the transmission of carrying out in real time image is no problem, but when the resolution of image is large, the data volume of image is large as reach 1M when above, because data volume is very large, the real-time Transmission that is difficult to accomplish image, and be starved of the real-time Transmission of carrying out image sometimes, such as the transmission of television image, perhaps the technical staff wishes to carry out the real-time Transmission of image.
Based on above-mentioned situation, how real-time and efficiently transmitting image information is a focus of field of picture communication research.At present, in order to realize the real-time Transmission of image, often adopt following method:
(1) by means of the hardware compression device, can realize the real-time Transmission of the image of high-resolution, big data quantity fully by increasing hardware coder, but the method weak point is to have increased hardware coder, has namely greatly increased cost, and does not utilize existing network environment fully;
(2) pass through Internet Transmission fully, advantage is not increase hardware, utilize existing network fully, cost is very low, and uses conveniently, but shortcoming is also arranged, the method is to carry out the transmission of image by single thread, be only applicable to the smaller image transmitting of data volume, such as the image less than 1M, in this case can the real-time Transmission image, but larger as during greater than 1M when image data amount, when carrying out the transmission of image by single thread, in order to realize the real-time Transmission of image, usually need in advance image information to be quantized compression, go redundancy, reduce transmitted data amount, improve efficiency of transmission, but the row compression will inevitably the damage image quality during to image, also will inevitably take cpu resource, efficiency of transmission is reduced, and therefore, this scheme mainly is fit to the Image Communication of low resolution.
Therefore, how to take full advantage of existing communication network, the image of real-time Transmission big data quantity is problem to be solved by this invention quickly and efficiently.
Summary of the invention
The objective of the invention is to utilize present communication network, can realize the real-time Transmission of image of the real-time Transmission, particularly big data quantity of image, fully need to be by means of the image hardware that adds, it is convenient to use, and image transmitting is efficiently quick, and is with low cost.
For achieving the above object, the technical solution used in the present invention is: a kind of method based on the C/S model transmitting images with large data volume in real time comprises the steps:
(1) at the send-thread of image transmitting terminal establishment more than 2 or 2, at the receiving thread of image receiving terminal establishment more than 2 or 2, and one to one relation will be set up between send-thread and the receiving thread, enable to intercom mutually, wherein, send-thread is identical with the quantity of receiving thread;
(2) quantity that when the image transmitting terminal determines that each width of cloth image segmentation become data block, should cut apart, described quantity is the quantity more than 2 or 2, and the quantity of this quantity and send-thread and receiving thread is identical;
(3) at the image receiving terminal be set the time interval of transmitting between adjacent two width of cloth images, to determine the transmitting time of synchronizing information;
When (4) beginning the real-time Transmission image, at first the image transmitting terminal sends the request of transmitting image to the image receiving terminal, after the image receiving terminal is received request, starts receiving thread, will agree that the order that sends image sends back to the image transmitting terminal; The image transmitting terminal starts send-thread after receiving the transmission order of image receiving terminal, the image transmitting terminal is according to the quantity described in the step (2), the first width of cloth image segmentation is become data block more than 2 or 2, then by send-thread data block is sent to the image receiving terminal, the image receiving terminal is by corresponding receiving thread receive data piece, after receiving thread receives all data blocks, by the image receiving terminal data block that receives is reassembled into original image, and upgrade synchronizing information according to pre-determined time interval in the step (3), and synchronizing information is sent to the image transmitting terminal;
(5) processing finishes if image transmitting is complete, if need to continue transmitting image, after then the image transmitting terminal is received synchronizing information from the image receiving terminal, the image transmitting terminal becomes data block more than 2 or 2 with the second width of cloth image segmentation, according to the described method transmission of step (4) with receive the second width of cloth image;
(6) repeating step (4) and step (5) are until all image transmittings are complete.
Further, obtain better invention effect for making the present invention, in the step (1), set up when concerning one to one between send-thread and the receiving thread, send-thread is set to identical port with the port of receiving thread, can realize;
Further, obtain better invention effect for making the present invention, for 2M and the image more than the 2M, send-thread and receiving thread are more than 4 or 4, piece image are divided into 4 data blocks or more than 4, the data volume between the data block is identical;
Further, obtain better invention effect for making the present invention, in the step (3), the time interval of transmitting between adjacent two width of cloth images is 〉=16ms; Further, for television image, the time interval of transmitting between adjacent two width of cloth images is 25fps or 30fps;
Further, obtain better invention effect for making the present invention, in step (4), (5), (6), data block of each send-thread/receiving thread sending/receiving;
Further, for guaranteeing data block of each send-thread/receiving thread sending/receiving, the method that adopts is: when creating send-thread and receiving thread in the step (1), each send-thread/receiving thread can obtain a sequence number simultaneously, sequence number is since 0, follow-up cumulative 1, its sequence number is identical between the send-thread of intercommunication and the receiving thread mutually; When the image receiving terminal was divided into data block with image, each data block also can obtain a sequence number, and sequence number is since 0, and follow-up cumulative 1; When the image transmitting terminal sent data block, the send-thread of specific numbers only sent the data block identical with own sequence number; In like manner, the receiving thread of image receiving terminal also has this corresponding relation with the data block that receives;
Further, the time interval of transmitting between adjacent two width of cloth images that set in advance in strict accordance with the image receiving terminal when image is sent, guarantee simultaneously data block of each send-thread/receiving thread sending/receiving, the present invention has adopted many locks and Mutex object method, and is specific as follows:
For the image transmitting terminal, after all data blocks of piece image are sent, can enter lock more than waits for, the event that should many locks withdraws from the whether update image data block of event and a manual triggers by an overall situation that automatically triggers forms, the latter after all send-threads are all received the return path signal that the image receiving terminal sends by manual triggers;
For the image receiving terminal, after having created all receiving threads, entering lock more than waits for, should be formed by the video data block recombination event that an overall situation that automatically triggers withdraws from event and a manual triggers by many locks, the latter after all receiving threads all receive separately data block by manual triggers;
Again further, many locks of image transmitting terminal, the specific works flow process is: in each send-thread, want first the transmission of executing data piece, Waiting Graph is as the return path signal of receiving terminal transmission afterwards, after receiving return path signal, under the protection of Mutex object, share counter and add 1, after this this thread enters the wait of lock more than, when the counting of finding to share counter when certain thread is identical with the quantity of send-thread, manual triggers update image data block event is shared counter O reset simultaneously, and the data block that enters thus a new round sends;
Many locks of image receiving terminal; the specific works flow process is: in each receiving thread; want first the reception of executing data piece; under the protection of Mutex object, share counter after receiving and add 1; and to image transmitting terminal transmission return path signal; after this entering lock more than waits for; when the counting of finding to share counter when certain receiving thread is identical with the quantity of receiving thread; manual triggers reconstructed picture data block recombination event; by the image receiving terminal all data blocks that receive are reassembled into original image; and upgrade simultaneously synchronizing information according to the pre-determined time interval, and synchronizing information is sent to the image transmitting terminal.
Beneficial effect of the present invention is: adopt method of the present invention, for image transmitting, particularly the large image of data volume does not need compression, need to be by hardware, can realize by network service the real-time Transmission of image fully, and the not loss of the quality of image, it is convenient to use, image transmitting is efficiently quick, with low cost, the program making broadcast system in the field of broadcast televisions particularly, this advantage is more obvious.
Description of drawings
Fig. 1 is the schematic flow sheet of the method for the invention.
Fig. 2 is the work schematic diagram of the many locks of image transmitting terminal in the method for the invention.
Fig. 3 is the schematic diagram that among the embodiment the method for the invention is applied to the television image real-time Transmission.
Fig. 4 is the corresponding relation of send-thread and receiving thread.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in detail.
The present embodiment is take the image transmitting of TV as example, as in Virtual Studio System, the designer of main control end (being equivalent to the image transmitting terminal) needs and (the being equivalent to the image receiving terminal) uniting and adjustment of broadcast end, so that real-time edition is revised scene, this moment, designer was played up the 3D figure on the one hand, on the one hand the 2D image that generates is sent to and broadcast the end demonstration, this reaches real-time with regard to the video image that needs previewer to present, high-fidelity, real-time Transmission to image has proposed high requirement, transmission for television image, China at present 24 dynamic bitmaps of SD that adopt transmits with the frame per second of 25fps more, adopt method of the present invention can easily realize the real-time Transmission of above-mentioned image, as shown in Figure 3, particularly:
As shown in Figure 1, a kind of method based on the C/S model transmitting images with large data volume in real time comprises the steps:
(1) at the send-thread of image transmitting terminal establishment more than 2 or 2, at the receiving thread of image receiving terminal establishment more than 2 or 2, and send-thread and receiving thread set up one to one relation, enable to intercom mutually, wherein, send-thread is identical with the quantity of receiving thread;
In the present embodiment, the image transmitting terminal is designer, and the image receiving terminal creates 4 send-threads for broadcasting end at the image transmitting terminal, and each send-thread can obtain a sequence number simultaneously, and sequence number is since 0, follow-uply adds up 1; Create 4 receiving threads at the image receiving terminal, each receiving thread can obtain a sequence number simultaneously, and sequence number is since 0, and is follow-up cumulative 1, and its sequence number is identical between the send-thread that intercoms mutually and the receiving thread; The establishment of send-thread and receiving thread all realizes by the socket method, and send-thread and receiving thread set up one to one relation, enable to intercom mutually, by specifying identical port to set up one-to-one relationship between send-thread and the receiving thread, thread and corresponding relation were as shown in Figure 4 during this example was executed;
(2) quantity that when the image transmitting terminal determines that each width of cloth image segmentation become data block, should cut apart, described quantity is the quantity more than 2 or 2, and the quantity of this quantity and image send-thread and image receiving thread is identical;
Television image commonly used in the present TV domain of China is 24 dynamic bitmaps of unpressed SD, the data volume of this image is generally all more than 2M, in the present embodiment, piece image is divided into 4 data blocks, data volume between 4 data blocks can be identical, also can be different, be identical in this example;
(3) at the image receiving terminal be set the time interval of transmitting between adjacent two width of cloth images;
At TV domain, the time interval of usually transmitting between adjacent two width of cloth images all is integrated in the I/O card, China generally all adopts the frame per second TV transmission image of 25fps at present, so in the present embodiment, the time interval of transmitting between adjacent two width of cloth images is set to 25fps;
When (4) beginning the real-time Transmission television image, at first the image transmitting terminal sends the request of transmitting image to the image receiving terminal, after the image receiving terminal is received request, starts 4 receiving threads, will agree that the order that sends image sends back to the image transmitting terminal; The image transmitting terminal starts 4 send-threads after receiving the transmission order of image receiving terminal, the image transmitting terminal is according to the quantity that determines in advance in the step (2), the first width of cloth image segmentation is become 4 data blocks that data volume is identical, each data block also can obtain a sequence number simultaneously, sequence number is since 0, and is follow-up cumulative 1, namely obtains data block 0, data block 1, data block 2 and data block 3 amount to 4 data blocks; Then by 4 send-threads these 4 data blocks are sent to the image receiving terminal, when sending data block, the send-thread of specific numbers only sends the data block identical with own sequence number, such as 1 transmission of send-thread data block 1 identical with own sequence number, in like manner, the receiving thread of receiving terminal and the data block that receives also have this corresponding relation, can guarantee that like this each send-thread only sends a data block; The image receiving terminal receives 4 data blocks by 4 corresponding receiving threads, owing to having set up in advance one to one relation between send-thread and the receiving thread, therefore be easy to realize the reception of data block, it is the data block 0 that receiving thread 0 receives from send-thread 0, the data block 1 that receiving thread 1 receives from send-thread 1, the data block 2 that receiving thread 2 receives from send-thread 2, the data block that receiving thread 3 receives from send-thread 3, after receiving thread receives all data blocks, 4 data blocks that will be received by the image receiving terminal are reassembled into original image, and upgrade synchronizing information according to the time interval information (the transmission frame per second that is image is 25fps) of image transmitting integrated in the I/O card, and synchronizing information is sent to the image transmitting terminal; The specific works flow process of send-thread and receiving thread as shown in Figure 2;
In the transmission course of the above-mentioned data block that is formed by image segmentation, for the transmission that guarantees image is carried out in strict accordance with the frame per second of 25fps, shared resource is used in mutual exclusion between the send-thread/receiving thread of each data block, the present invention has adopted many locks and Mutex object method for this reason, and is particularly as follows:
For the image transmitting terminal, after all data blocks of a two field picture are sent, can enter lock more than waits for, the event that should many locks withdraws from the whether update image data block of event and a manual triggers by an overall situation that automatically triggers forms, the latter after all send-threads are all received the return path signal that the image receiving terminal sends by manual triggers, that is: in each send-thread, want first the transmission of executing data piece, Waiting Graph is as the return path signal of receiving terminal transmission afterwards, after receiving return path signal, under the protection of Mutex object, share counter and add 1, after this this thread enters the wait of lock more than, when certain thread finds that shared counter is 4, manual triggers update image data block event namely can have been upgraded the data of data block, shares simultaneously counter O reset, and the renewal of video data block means the beginning that new piece image sends, the data block that enters thus a new round sends, and detailed process as shown in Figure 2;
At the image receiving terminal; after having created all receiving threads; entering lock more than waits for; should be formed by the video data block recombination event that an overall situation that automatically triggers withdraws from event and a manual triggers by many locks; the latter after all receiving threads all receive separately data block by manual triggers; that is: in each receiving thread; want first the reception of executing data piece; under the protection of Mutex object, share counter after receiving and add 1; and to image transmitting terminal transmission return path signal; after this entering lock more than waits for; when certain receiving thread found that shared counter is 4, manual triggers reconstructed picture data block recombination event was reassembled into original image by the image receiving terminal with all data blocks that receive; and upgrade I/O card synchronizing information, and synchronizing information is sent to the image transmitting terminal.
(5) if also have image to need transmission, after then the image transmitting terminal is received synchronizing information from the image receiving terminal, the image transmitting terminal is divided into 4 data blocks that data volume is identical with the second two field picture, according to the transmission of the described method of step (4) with receive the second two field picture;
(6) repeating step (4) and step (5) are until all image transmittings are complete.
Method of the present invention is not limited to the embodiment described in the embodiment, and those skilled in the art's technical scheme according to the present invention draws other execution mode, belongs to equally technological innovation scope of the present invention.
Claims (10)
1. the method based on the C/S model transmitting images with large data volume in real time comprises the steps:
(1) at the send-thread of image transmitting terminal establishment more than 2 or 2, at the receiving thread of image receiving terminal establishment more than 2 or 2, and one to one relation will be set up between send-thread and the receiving thread, enable to intercom mutually, wherein, send-thread is identical with the quantity of receiving thread;
(2) quantity that when the image transmitting terminal determines that each width of cloth image segmentation become data block, should cut apart, described quantity is the quantity more than 2 or 2, and the quantity of this quantity and send-thread and receiving thread is identical;
(3) at the image receiving terminal be set the time interval of transmitting between adjacent two width of cloth images, to determine the transmitting time of synchronizing information;
When (4) beginning the real-time Transmission image, at first the image transmitting terminal sends the request of transmitting image to the image receiving terminal, after the image receiving terminal is received request, starts receiving thread, will agree that the order that sends image sends back to the image transmitting terminal; The image transmitting terminal starts send-thread after receiving the transmission order of image receiving terminal, the image transmitting terminal is according to the quantity described in the step (2), the first width of cloth image segmentation is become data block more than 2 or 2, then by send-thread data block is sent to the image receiving terminal, the image receiving terminal is by corresponding receiving thread receive data piece, after receiving thread receives all data blocks, by the image receiving terminal data block that receives is reassembled into original image, and upgrade synchronizing information according to pre-determined time interval in the step (3), and synchronizing information is sent to the image transmitting terminal;
(5) processing finishes if image transmitting is complete, if need to continue transmitting image, after then the image transmitting terminal is received synchronizing information from the image receiving terminal, the image transmitting terminal becomes data block more than 2 or 2 with the second width of cloth image segmentation, according to the described method transmission of step (4) with receive the second width of cloth image;
(6) repeating step (4) and step (5) are until all image transmittings are complete.
2. a kind of method based on the C/S model transmitting images with large data volume in real time as claimed in claim 1, it is characterized in that: in the step (1), set up when concerning one to one between send-thread and the receiving thread, send-thread is set to identical port with the port of receiving thread.
3. a kind of method based on the C/S model transmitting images with large data volume in real time as claimed in claim 1, it is characterized in that: for 2M and the image more than the 2M, send-thread and receiving thread are more than 4 or 4, piece image are divided into 4 data blocks or more than 4.
4. a kind of method based on the C/S model transmitting images with large data volume in real time as claimed in claim 3, it is characterized in that: the data volume between the data block is identical.
5. a kind of method based on the C/S model transmitting images with large data volume in real time as claimed in claim 1 is characterized in that: in the step (3), the time interval of transmitting between adjacent two width of cloth images is 〉=16ms.
6. a kind of method based on the C/S model transmitting images with large data volume in real time as claimed in claim 5, it is characterized in that: for television image, the time interval of transmitting between adjacent two width of cloth images is 25fps or 30fps.
7. a kind of method based on the C/S model transmitting images with large data volume in real time as claimed in claim 1 is characterized in that: in step (4), (5), (6), and data block of each send-thread/receiving thread sending/receiving.
8. a kind of method based on the C/S model transmitting images with large data volume in real time as claimed in claim 7, it is characterized in that: for guaranteeing data block of each send-thread/receiving thread sending/receiving, the method that adopts is: when creating send-thread and receiving thread in the step (1), each send-thread/receiving thread can obtain a sequence number simultaneously, sequence number is since 0, follow-up cumulative 1, its sequence number is identical between the send-thread of intercommunication and the receiving thread mutually; When the image receiving terminal was divided into data block with image, each data block also can obtain a sequence number, and sequence number is since 0, and follow-up cumulative 1; When the image transmitting terminal sent data block, the send-thread of specific numbers only sent the data block identical with own sequence number; In like manner, the receiving thread of image receiving terminal also has this corresponding relation with the data block that receives.
9. such as claim 7 or 8 described a kind of methods based on the C/S model transmitting images with large data volume in real time, it is characterized in that: the time interval of transmitting between adjacent two width of cloth images that set in advance in strict accordance with the image receiving terminal when image is sent, guarantee simultaneously data block of each send-thread/receiving thread sending/receiving, the present invention has adopted many locks and Mutex object method, and is specific as follows:
For the image transmitting terminal, after all data blocks of piece image are sent, can enter lock more than waits for, the event that should many locks withdraws from the whether update image data block of event and a manual triggers by an overall situation that automatically triggers forms, the latter after all send-threads are all received the return path signal that the image receiving terminal sends by manual triggers;
For the image receiving terminal, after having created all receiving threads, entering lock more than waits for, should be formed by the video data block recombination event that an overall situation that automatically triggers withdraws from event and a manual triggers by many locks, the latter after all receiving threads all receive separately data block by manual triggers.
10. a kind of method based on the C/S model transmitting images with large data volume in real time as claimed in claim 9, it is characterized in that: many locks of image transmitting terminal, the specific works flow process is: in each send-thread, want first the transmission of executing data piece, Waiting Graph is as the return path signal of receiving terminal transmission afterwards, after receiving return path signal, under the protection of Mutex object, share counter and add 1, after this this thread enters the wait of lock more than, when the counting of finding to share counter when certain thread is identical with the quantity of send-thread, manual triggers update image data block event is shared counter O reset simultaneously, and the data block that enters thus a new round sends;
Many locks of image receiving terminal; the specific works flow process is: in each receiving thread; want first the reception of executing data piece; under the protection of Mutex object, share counter after receiving and add 1; and to image transmitting terminal transmission return path signal; after this entering lock more than waits for; when the counting of finding to share counter when certain receiving thread is identical with the quantity of receiving thread; manual triggers reconstructed picture data block recombination event; by the image receiving terminal all data blocks that receive are reassembled into original image; and upgrade simultaneously synchronizing information according to the pre-determined time interval, and synchronizing information is sent to the image transmitting terminal.
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| CN103248452B (en) * | 2012-02-10 | 2017-02-15 | 宇龙计算机通信科技(深圳)有限公司 | Data sending device, data receiving device, terminal and data transmission method |
| CN102685257B (en) * | 2012-06-11 | 2016-01-27 | 深圳中兴网信科技有限公司 | Data synchronization processing system, data synchronizing processing method, server system |
| CN103686067B (en) * | 2012-09-25 | 2017-01-25 | 中国航天科工集团第二研究院二〇七所 | A compression-free high-definition image real-time transmission method based on a TCP |
| CN103414743B (en) * | 2013-07-03 | 2016-12-28 | 百度在线网络技术（北京）有限公司 | A kind of picture transmission method and system |
| CN104580094A (en) * | 2013-10-21 | 2015-04-29 | 中兴通讯股份有限公司 | Image transmission method and device |
| CN104142865A (en) * | 2014-07-18 | 2014-11-12 | 国家电网公司 | Data collecting and processing method based on thread synchronization |
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| CN106529195A (en) * | 2016-12-02 | 2017-03-22 | 郑州云海信息技术有限公司 | Data acquisition and analysis method and device |
| US20180174359A1 (en) * | 2016-12-15 | 2018-06-21 | Mediatek Inc. | Frame difference generation hardware in a graphics system |
| CN108419029A (en) * | 2018-05-07 | 2018-08-17 | 威创集团股份有限公司 | A kind of spelling wall image transfer method and device |
| CN109634957B (en) * | 2018-11-19 | 2019-11-29 | 中国石油集团长城钻探工程有限公司 | A kind of log data dynamic high-efficiency access method |
| CN111683065A (en) * | 2020-05-23 | 2020-09-18 | 上海沪工焊接集团股份有限公司 | Data transmission method, system and device of welding machine communication protocol and storage medium |
| CN113473106A (en) * | 2021-06-18 | 2021-10-01 | 青岛小鸟看看科技有限公司 | Image transmission method, image display and processing device, and image transmission system |
| US11758108B2 (en) | 2021-06-18 | 2023-09-12 | Qingdao Pico Technology Co., Ltd. | Image transmission method, image display device, image processing device, image transmission system, and image transmission system with high-transmission efficiency |
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