CN101102487A - Video transmission system and method based on VGA and HDMI display mode - Google Patents
Video transmission system and method based on VGA and HDMI display mode Download PDFInfo
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- CN101102487A CN101102487A CNA2007101195755A CN200710119575A CN101102487A CN 101102487 A CN101102487 A CN 101102487A CN A2007101195755 A CNA2007101195755 A CN A2007101195755A CN 200710119575 A CN200710119575 A CN 200710119575A CN 101102487 A CN101102487 A CN 101102487A
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Abstract
The system comprises a sending end and a receiving end both connected via IP network. Said sending end uses a video collection device with 1394 or HDMI interface to get original HD TV video data, and makes pretreatment for the original video data, and uses video encoder to encode the video data, and transmits the encoded video data to the receiving end; the receiving end uses a video decoder to decode the video data and makes post-process for the decoded data; the terminal display device can either use a VGA interface to display analog video image, or use the HDMI interface to display a HD digital video image.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of system and method that collects video acquisition, transmits and be shown as one, this system and method shows based on VGA and two kinds of patterns of HDMI.Wherein, described VGA is the Video Graphic Array abbreviation of (showing the drawing array), and HDMI is the abbreviation of High Definition Multimedia Interface (HDMI (High Definition Multimedia Interface)).
Background technology
Along with the fast development of multimedia technology, audio frequency, video, image etc. extensively are melted in the daily life, become an indispensable part, such as cable TV, and home theater etc.Multimedia technology can also combine with computer, internet technology, is applied to various fields such as video conference, audio/video on-demand, long-distance education.Simultaneously, along with the rise of high definition video collecting and display device, the HD video fast development is to satisfy demand for experience and some application scenario that definition is had relatively high expectations that people improve day by day.
The acquisition of vision signal relates to multiple different technology such as collection, transmission and demonstration.Because the transmission of video image transmission system, particularly HD video, have that data volume is big, real-time requires characteristics such as height, have bigger technical difficulty, therefore also become restriction video image and computer, internet further combined with key factor.
In existing Video transmission system, the general ordinary video encoding and decoding standard that uses such as MPEG-2, becomes single-definition (as 800 * 600) resolution with video image compression, cause the loss of video image details so inevitably, can't arrive the purpose that high definition shows.MPEG-4, H.264 wait the high definition video encoding and decoding standard to provide the real-time guarantee, can effectively transmit high-definition video signal for the transmission of HD video.Simultaneously, HDMI (HDMI (High Definition Multimedia Interface)) can provide the data transfer bandwidth up to 5Gbps, guaranteeing to be enough to deal with a 1080P (audio signal of 1920 * 1080P) video and one 8 sound channel with the high-resolution video and the multichannel audio data of digital form transmission uncompressed under the high-quality situation.Though the video image display effect of VGA interface is general, present most of terminal presentation facilities are still continued to use, so the VGA interface is the indispensable part of Video transmission system.Above-mentioned technology all is that the transmission of transmission of video images, particularly HD video provides high-fidelity and real-time guarantee.
Summary of the invention
The present invention is directed to the defective or the deficiency that exist in the prior art, a kind of Video transmission system based on VGA and two kinds of display modes of HDMI is provided, adopt this system can realize collection of video signal, transmission and demonstration, and perfect by improving, this system also has characteristics such as video quality height, real-time are good, highly versatile.
The present invention also provides a kind of video transmission method based on VGA and two kinds of display modes of HDMI.
The total technical conceive of the present invention is, based on VGA and two kinds of interfaces of HDMI and IP network, utilize the HD video source, high-definition video signal codec and terminal presentation facility, realize collection of video signal, transmission and demonstration, on terminal presentation facility, both can pass through VGA interface transmitting and displaying video image, and the while display control interface, HDMI interface transmitting and displaying high-definition digital video picture can be passed through again.
Technical scheme of the present invention is as follows:
Video transmission system based on VGA and two kinds of display modes of HDMI is characterized in that: comprise by IP network interconnected transmitting terminal and receiving terminal; Described transmitting terminal to obtain original HD video data, carries out preliminary treatment to this original video data by having 1394 or the video capture device of HDMI interface, and by being transferred to receiving terminal behind the video encoding module coding; Described receiving terminal is by the decoding of video decode module, and decoded data are carried out the later stage Video processing, on terminal presentation facility, both can pass through VGA interface transmitting and displaying video image, and the while display control interface, HDMI interface transmitting and displaying high-definition digital video picture can be passed through again.
The architecture of described VGA interface comprises 5 unit modules: it is 1 for timing sequencer: the clock signal that produces all functions module on the control entire chip; It 2 is CRT (cathode ray tube) controller: produce CRT clock signal (as the synchronous HS of row, field synchronization VS signal etc.), refresh synchronously with control CRT display operation and demonstration; It 3 is a graphics controller: each pixel color data of the required display image of control able to programme, and be stored in the color management device; It is 4 for the color management device: extract each pixel rgb three primary colors color data, be digital signal; It is 5 for the DAC digital to analog converter: the rgb digital signal is converted into the RGB analog signal, shows for CRT monitor.
Described HDMI interface has following architecture: comprise 3 independently communication ports: be used for transmitting the TMDS passage of audio/video data and auxiliary data, described TMDS is the abbreviation of minimum translation difference sub-signal; Being used for when automatic configuration transmitting terminal reads the DDC passage of the EDID data structure of receiving terminal, described DDC is the abbreviation of data display channel, described EDID is the abbreviation of expanded display recognition data, and it is a kind of data format, comprises the parameter of relevant terminal equipment and performance thereof; Be used for supporting the CEC passage of advanced level user's function, described CEC is the abbreviation of user's electronic control, and it is an optional passage.
Described HDMI interface comprises: the coding of HDMI sends chip, and the coding that video, audio frequency and auxiliary signal are sent into HDMI sends chip, carries out digital coding; 3 road TMDS data channel and 1 road TMDS clock passage, data after will encoding by 3 road TMDS data channel and 1 road TMDS clock passage are sent to signal receiving end, described TMDS clock passage is used to transmit the video pixel clock signal, as receiving terminal the data that 3 road TMDS data channel transmit is carried out the recovered frequency reference; The HDMI decoding chip of receiving terminal is used for data decode, with corresponding audio signal reduction and deliver in the corresponding processing module.
Described IP network comprises wired IP network and/or Wireless IP network; The resolution of described original video data is the high clear video image resolution of 1440 * 1080i or 1920 * 1080i or 1280 * 720P or 1920 * 1080P or extended formatting; Described video encoding module and video decode module adopt MPEG-4, H.264, high definition video encoding and decoding standards such as VC-1 or AVS.
Described pretreatment module and later stage video processing module be all at PC, or realize on the dedicated video picture processing chip; Preliminary treatment is that video data is reduced or convergent-divergent, code check and frame per second control etc.; The later stage Video processing is used for video image is carried out level and smooth noise reduction, image quality enhancement process such as contrast enhancing, and pixel resolution adjustment; Described PC is meant personal computer, and it comprises based on X86 framework or the desktop computer of Power PC processor, portable PC, notebook computer etc.
Described video capture device has 1394 or the HDMI interface; Described terminal presentation facility has VGA and HDMI interface.
Video transmission method based on VGA and two kinds of patterns demonstrations of HDMI is characterized in that may further comprise the steps:
Step 8, processed video data both can be passed through VGA interface transmitting and displaying video image on terminal presentation facility, and the while display control interface, can pass through HDMI interface transmitting and displaying high-definition digital video picture again.
Preliminary treatment in the described step 2 is that video data is reduced or convergent-divergent, code check and frame per second control.
Later stage Video processing in the described step 7 is that video image is carried out level and smooth noise reduction, the image quality enhancement process that contrast strengthens, and pixel resolution adjustment.
Technique effect of the present invention is as follows:
1. adopt high definition video collecting equipment, video image quality height;
2. adopt the HD video encoding and decoding standard, image fault is little, and system's time delay is little, real-time good;
3. HDMI high-definition digital video display interface is promptly arranged, keep VGA analog signal display interface again, system's highly versatile.
Description of drawings
Fig. 1 is a system block diagram of the present invention.
Fig. 2 is a system works functional-block diagram of the present invention, and numeral 1 to 9 is a flow sequence number in the square frame.
Fig. 3 is the block diagram of HDMI interface among the present invention.
Fig. 4 is the block diagram of VGA interface among the present invention.
Reference numeral lists as follows:
The 100-video source, 200-transmitting terminal, 300-IP network, 400-receiving terminal, 500-VGA display device, 600-HDMI display device.
Embodiment
As shown in Figure 1, high-resolution video transfer system of the present invention, this system is based on VGA and two kinds of interfaces of HDMI, and it comprises: video source 100, transmitting terminal 200, IP network 300, receiving terminal 400, VGA display device 500, HDMI display device 600.Wherein, described video source 100 and transmitting terminal 200 by have 1394 or the transmission line of HDMI interface link to each other; Transmitting terminal 200, receiving terminal 400 is interconnected by IP network 300; Receiving terminal 400 links to each other by the transmission line with VGA interface with VGA display device 500; Receiving terminal 400 links to each other by the transmission line with HDMI interface with HDMI display device 600.
The output interface of described video source 100 is 1394 or the HDMI interface;
The input interface of described transmitting terminal 200 is 1394 or the HDMI interface, and output interface is the IP network interface;
The input interface of described receiving terminal 400 is the IP network interface, and output interface has VGA and two kinds of interfaces of HDMI;
The input interface of described VGA display device 500 is the VGA interface;
The input interface of described HDMI display device 600 is the HDMI interface.
The function that described transmitting terminal 200 is realized comprises:
(1) by video capture device, obtains original HD video data;
(2) original video data is carried out preliminary treatment;
(3) by video encoding module to coding video data;
(4) video data after will encoding is sent to receiving terminal 400 by IP network 300.
The function that described receiving terminal 400 is realized comprises:
(1) by IP network 300 receiver, video code stream;
(2) decode by the video decode module;
(3) decoded video data is carried out the later stage Video processing;
(4) use the terminal presentation facility display frame with VGA and HDMI interface, wherein the VGA interface can display control interface, and the HDMI interface is the display video picture only.
The present invention is based on the video transmission method that two kinds of patterns of VGA and HDMI show, it comprises:
(1) collection of high-definition video signal obtains original video data, and by 1394 or the HDMI interface original video data at a high speed, is nondestructively sent to pretreatment module;
(2) original video data is carried out preliminary treatment;
(3) start video encoding module to coding video data, so that Network Transmission improves real-time;
(4) video data after will encoding is sent to receiving terminal 400 by IP network 300;
(5) by IP network 300 receiver, video code streams;
(6) starting the video decode module decodes;
(7) decoded video data is carried out the later stage Video processing;
(8) use the terminal presentation facility display frame with VGA and HDMI interface, wherein the VGA interface can display control interface, and the HDMI interface is the display video picture only.
As shown in Figure 2, the operation principle that the present invention is based on the Video transmission system that two kinds of patterns of VGA and HDMI show is:
1. the collection of high-definition video signal, obtain original video data, its resolution is: the high clear video image of 1440 * 1080i or 1920 * 1080i or 1280 * 720P or 1920 * 1080P or extended formatting, and by 1394 or the HDMI interface original video data at a high speed, is nondestructively sent to pretreatment module;
2. original video data is reduced or convergent-divergent preliminary treatment such as code check and frame per second control;
3. transmitting terminal is to coding video data, can carry out video coding by HD video encoder (MPEG-4, H.264, VC-1 or AVS);
4. the video data after transmitting terminal will be encoded is sent to receiving terminal by IP network 300;
5. receiving terminal is by IP network 300 receiving video datas;
6. receiving terminal is decoded to video data, can carry out video decode by HD video decoder (MPEG-4, H.264, VC-1 or AVS);
7. receiving terminal carries out image quality to decoded data and strengthens later stage Video processing such as pixel resolution adjustment;
8. for terminal presentation facility, then pass through VGA interface transmitting and displaying video image with VGA interface, and the while display control interface;
9. for terminal presentation facility, then by HDMI interface transmitting and displaying high-definition digital video picture with HDMI interface.
As can be seen from Figure 2,1394 of step 1 or HDMI gathers, the video preprocessor of step 2 is handled, the video coding of step 3 and the transmission of step 4 are finished by transmitting terminal; The video post-processed of the reception of step 5, the video decode of step 6, step 7, the VGA of step 8 show and the HDMI demonstration of step 9 is finished by receiving terminal.
As shown in Figure 3, the architecture of HDMI interface among the present invention, it comprises 3 independently communication port: TMDS, DDC and CEC.
Described TMDS is the abbreviation of Transition Minimized Differential Signal (minimum translation difference sub-signal), and the TMDS passage is used for transmitting audio/video data and auxiliary data.
Described DDC is the abbreviation of Digital Display Channel (data display channel), and the DDC passage is used for when automatic configuration transmitting terminal and reads the EDID data structure of receiving terminal.Described EDID is the abbreviation of Extended Display IdentificationData (expanded display recognition data), and it is a kind of data format, comprises the parameter of relevant terminal equipment and performance thereof.
Described CEC is the abbreviation of Consumer Electronics Control (user's electronic control), and the CEC passage is an optional passage, is used for supporting some advanced level user's functions, as infrared remote control etc.
The HDMI interface comprises among the present invention: the coding of HDMI sends chip, and the coding that video, audio frequency and auxiliary signal are sent into HDMI sends chip, carries out digital coding; Data after will encoding by 3 road TMDS data channel and 1 road TMDS clock passage are sent to signal receiving end, described TMDS clock passage is used to transmit the video pixel clock signal, as receiving terminal the data that 3 road TMDS data channel transmit is carried out the recovered frequency reference; The HDMI decoding chip of receiving terminal is used for data decode, with corresponding audio signal reduction and deliver in the corresponding processing module.Corresponding processing module is meant HD video display terminal or HD video encoder.Auxiliary signal comprises field, line synchronizing signal.
The audio/video method for transmitting signals of HDMI interface among the present invention, its feature comprises:
(1) video, audio frequency and auxiliary signal (as field, line synchronizing signal) are sent into the coding transmission chip of HDMI, carry out digital coding;
(2) pass through 3 road TMDS data channel and 1 road TMDS clock channel transfer to signal receiving end.Described TMDS clock passage is used to transmit the video pixel clock signal, as receiving terminal the data that 3 road TMS data channel transmit is carried out the recovered frequency reference;
(3) the HDMI decoding chip of receiving terminal carries out data decode, with corresponding audio signal reduction and deliver in the corresponding processing module (as HD video display terminal or HD video encoder).
As shown in Figure 4, the architecture of VGA interface among the present invention, it comprises 5 unit modules:
1. timing sequencer: the clock signal that produces all functions module on the control entire chip;
(2.CRT cathode ray tube) controller: produce CRT clock signal (as the synchronous HS of row, field synchronization VS signal etc.), refresh synchronously with control CRT display operation and demonstration;
3. graphics controller: each pixel color data of the required display image of control able to programme, and be stored in the color management device;
4. color management device: extract each pixel rgb three primary colors color data, be digital signal;
(5.DAC digital to analog converter): the rgb digital signal is converted into the RGB analog signal, shows for CRT monitor.
Should be pointed out that the above embodiment can make those skilled in the art more fully understand the present invention, but do not limit the present invention in any way.Therefore, although this specification has been described in detail the present invention with reference to accompanying drawing, but, those skilled in the art are to be understood that, still can make amendment or be equal to replacement the present invention, for example, the receiving terminal in the accompanying drawing is only indicated one situation, but obvious many networkings often in reality is implemented; In addition, transmitting terminal and receiving terminal also can be integrated on same the PC; Having the display device and the display device with HDMI interface of VGA interface, both can be two different display devices, also can be an equipment that has these two kinds of display interfaces simultaneously.And all do not break away from the technical scheme and the improvement thereof of the spirit and scope of the present invention, and it all should be encompassed in the middle of the protection range of patent of the present invention.
Claims (10)
1. based on the Video transmission system of VGA and two kinds of display modes of HDMI, it is characterized in that: comprise by IP network interconnected transmitting terminal and receiving terminal; Described transmitting terminal to obtain original HD video data, carries out preliminary treatment to this original video data by having 1394 or the video capture device of HDMI interface, and by being transferred to receiving terminal behind the video encoding module coding; Described receiving terminal is by the decoding of video decode module, and decoded data are carried out the later stage Video processing, on terminal presentation facility, both can pass through VGA interface transmitting and displaying video image, and the while display control interface, HDMI interface transmitting and displaying high-definition digital video picture can be passed through again.
2. the Video transmission system based on VGA and two kinds of display modes of HDMI according to claim 1, it is characterized in that: the architecture of described VGA interface comprises 5 unit modules: it is 1 for timing sequencer: the clock signal that produces all functions module on the control entire chip; It 2 is CRT (cathode ray tube) controller: produce CRT clock signal (as the synchronous HS of row, field synchronization VS signal etc.), refresh synchronously with control CRT display operation and demonstration; It 3 is a graphics controller: each pixel color data of the required display image of control able to programme, and be stored in the color management device; It is 4 for the color management device: extract each pixel rgb three primary colors color data, be digital signal; It is 5 for the DAC digital to analog converter: the rgb digital signal is converted into the RGB analog signal, shows for CRT monitor.
3. the Video transmission system based on VGA and two kinds of display modes of HDMI according to claim 1, it is characterized in that: described HDMI interface has following architecture: comprise 3 independently communication ports: be used for transmitting the TMDS passage of audio/video data and auxiliary data, described TMDS is the abbreviation of minimum translation difference sub-signal; Being used for when automatic configuration transmitting terminal reads the DDC passage of the EDID data structure of receiving terminal, described DDC is the abbreviation of data display channel, described EDID is the abbreviation of expanded display recognition data, and it is a kind of data format, comprises the parameter of relevant terminal equipment and performance thereof; Be used for supporting the CEC passage of advanced level user's function, described CEC is the abbreviation of user's electronic control, and it is an optional passage.
4. the Video transmission system based on VGA and two kinds of display modes of HDMI according to claim 1, it is characterized in that: described HDMI interface comprises: the coding of HDMI sends chip, the coding that video, audio frequency and auxiliary signal are sent into HDMI sends chip, carries out digital coding; 3 road TMDS data channel and 1 road TMDS clock passage, data after will encoding by 3 road TMDS data channel and 1 road TMDS clock passage are sent to signal receiving end, described TMDS clock passage is used to transmit the video pixel clock signal, as receiving terminal the data that 3 road TMDS data channel transmit is carried out the recovered frequency reference; The HDMI decoding chip of receiving terminal is used for data decode, with corresponding audio signal reduction and deliver in the corresponding processing module.
5. the Video transmission system based on VGA and two kinds of display modes of HDMI according to claim 1, it is characterized in that: described IP network comprises wired IP network and/or Wireless IP network; The resolution of described original video data is the high clear video image resolution of 1440 * 1080i or 1920 * 1080i or 1280 * 720P or 1920 * 1080P or extended formatting; Described video encoding module and video decode module adopt MPEG-4, H.264, high definition video encoding and decoding standards such as VC-1 or AVS.
6. the Video transmission system based on VGA and two kinds of display modes of HDMI according to claim 1 is characterized in that: described pretreatment module and later stage video processing module be all at PC, or realize on the dedicated video picture processing chip; Preliminary treatment is that video data is reduced or convergent-divergent, code check and frame per second control etc.; The later stage Video processing is used for video image is carried out level and smooth noise reduction, image quality enhancement process such as contrast enhancing, and pixel resolution adjustment; Described PC is meant personal computer, and it comprises based on X86 framework or the desktop computer of Power PC processor, portable PC, notebook computer etc.
7. the Video transmission system based on VGA and two kinds of display modes of HDMI according to claim 1 is characterized in that: described video capture device has 1394 or the HDMI interface; Described terminal presentation facility has VGA and HDMI interface.
8. based on the video transmission method of VGA and two kinds of patterns demonstrations of HDMI, it is characterized in that may further comprise the steps:
Step 1 by having 1394 or the video capture device of HDMI interface, obtains original HD video data;
Step 2 is carried out preliminary treatment to original video data;
Step 3, by video encoding module to pretreated coding video data;
Step 4, the video flowing after transmitting terminal will be encoded sends to receiving terminal by IP network;
Step 5, receiving terminal is by the video data behind the IP network received code;
Step 6 is decoded to the video data that receives by the video decode module;
Step 7 is carried out the later stage Video processing to decoded video data;
Step 8, processed video data both can be passed through VGA interface transmitting and displaying video image on terminal presentation facility, and the while display control interface, can pass through HDMI interface transmitting and displaying high-definition digital video picture again.
9. the video transmission method based on VGA and two kinds of patterns demonstrations of HDMI according to claim 8, it is characterized in that: the preliminary treatment in the described step 2 is that video data is reduced or convergent-divergent, code check and frame per second control.
10. the video transmission method based on VGA and two kinds of patterns demonstrations of HDMI according to claim 8, it is characterized in that: the later stage Video processing in the described step 7 is that video image is carried out level and smooth noise reduction, the image quality enhancement process that contrast strengthens, and pixel resolution adjustment.
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| CNA2007101195755A CN101102487A (en) | 2007-07-26 | 2007-07-26 | Video transmission system and method based on VGA and HDMI display mode |
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| CNA2007101195755A CN101102487A (en) | 2007-07-26 | 2007-07-26 | Video transmission system and method based on VGA and HDMI display mode |
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| CN101916186A (en) * | 2010-07-30 | 2010-12-15 | 深圳创维－Rgb电子有限公司 | Method, device and terminal for expanded display of mobile terminal view |
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| CN105578139A (en) * | 2015-12-23 | 2016-05-11 | 苏州市职业大学 | High definition video collection and display system |
| CN106341635A (en) * | 2016-09-23 | 2017-01-18 | 赵立峰 | Full HD video generating system and method |
| CN106851165A (en) * | 2017-03-28 | 2017-06-13 | 歌尔科技有限公司 | A kind of HDMI signal expansion circuits, extended method and VR products |
| CN106851165B (en) * | 2017-03-28 | 2023-10-13 | 歌尔科技有限公司 | HDMI signal expansion circuit, expansion method and VR product |
| CN110312158A (en) * | 2018-03-27 | 2019-10-08 | 北京市博汇科技股份有限公司 | A kind of monitoring method and device of embedded more pictures |
| CN111405271A (en) * | 2020-03-25 | 2020-07-10 | 中晨科技（深圳）有限公司 | Micro display driving system |
| CN111954062A (en) * | 2020-07-14 | 2020-11-17 | 西安万像电子科技有限公司 | Information processing method and device |
| CN112599083A (en) * | 2020-12-24 | 2021-04-02 | 深圳市洲明科技股份有限公司 | Data transmission method, data receiving method, sending card and receiving card of display screen |
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