CN103428493A - Light wireless transmission system for high-definition videos - Google Patents
Light wireless transmission system for high-definition videos Download PDFInfo
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Abstract
The invention discloses a light wireless transmission system for high-definition videos. The light wireless transmission system comprises a video server side and a video browser side, wireless data transmission between the video server side and the video browser end is performed through a Mesh network, the video server side comprises a kernel processing chip and a wireless transmitter module connected with the kernel processing chip, an image collecting interface is arranged on the kernel processing chip, and the video browser side adopts a computer and client-side video browsing software based on a Windows platform. According to the light wireless transmission system, long-distance transmission of 720P high-definition images under the condition of limited wireless bandwidth is achieved, a transmitting side device has the advantages of being light in mass, low in power consumption and the like, expensive application to mobile equipment with limited loads is facilitated, problems of major natural disaster scenes, large-scale mass meetings, important security scenes and the like can be assisted to solve, rear commanders need to know problems of real-time information timely to improve the decision response accuracy and timeliness and to improve the working efficiency.
Description
The present invention obtains Tianjin Natural Science Fund In The Light support, and fund number is 13JCYBJC15800.
Technical field
The invention belongs to video image and process and the wireless network communication technique field, relate to a kind of collection and long distance transmitter of high-definition video signal.
Background technology
In the productive life of modern society, to the application demand rapid growth of wireless video transmission.After wireless video transmission system is the video information compression coding that the imageing sensor collection in worksite is arrived, transfer to the rear client by wireless mode, rear is after receiving video information, decode in time and be presented on screen, be convenient to the rear personnel and promptly make a policy, effectively shorten the response time.
Wireless video transmission system militarily can be used for scouting, supervision etc., on civilian, can be used for the fields such as planning survey, remotely sensed image, emergency dealing.Image delivering system for some Police Command Center, often require the on-the-spot realtime graphic communication of accident to command centre, such as major natural disasters scene, large-scale mass-meeting and important security scene etc., to improve accuracy and the promptness of reply decision-making, increase work efficiency.
Wireless image transmission is realtime video transmission, mainly contains two key technologies: the one, and the compression of HD video is processed, i.e. video compression; The 2nd, Wireless Data Transmission, i.e. RFDC in motion.Therefore, development can be in the high-speed mobile process by frequency band, very wide high definition video signal carries out the Wireless Image Transmission Systems of stable transfer, will solve two subject matters: the one, under high-resolution, the video compression algorithm that compression ratio is high as far as possible; The 2nd, the real time high-speed data communication of high stability.
The image resolution ratio of current wireless video image transmission system is lower, is limited by video compression algorithm, and its code stream is higher, and the effective transmission speed of existing wireless communication link is lower, is difficult to transmit the high-definition video signal of low compression ratio.
Development along with computer software and hardware and wireless communication technology, the wireless video transmission technology has also obtained fast development, the application of wireless video transmission technology is also more and more extensive, and the real-time of this bandwidth of data communication to video image transmission system and video pictures is had higher requirement.And in the application of existing wireless video transmission, video compression coding take MPEG2/4, H.261/263 wait as main.Wherein high quality graphic (resolution of standard P AL/NTSC standard is not less than 720 * 576) is generally in the majority with the MPEG2 coding and decoding, and the average code stream of HD video is more than 10Mbps, higher to the transfer of data rate requirement.The developing direction of wireless high definition video transmission system is tending towards high Qinghua, the intellectuality of transmission link, the system function integration of video resolution day by day.
Summary of the invention
The present invention is exactly compression processing and the wireless transmission problem in order to solve above-mentioned high-definition video information of the prior art, and a kind of lightness high-definition video wireless transmission system is provided.
The present invention realizes by following technical scheme:
Lightness high-definition video wireless transmission system of the present invention, comprise video server end and video browser end, and video server end and video browser end carry out Wireless Data Transmission by the Mesh network; The video server end comprises kernel processor chip and the wireless transmitter module be connected with kernel processor chip, is provided with image capture interface on kernel processor chip; The video browser end adopts computer and the client video tour software based on windows platform.
Described image capture interface connects ccd image sensor, cmos image sensor or DV camera apparatus.
Described video server end utilizes H.264/AVC compression standard to carry out the high compression ratio compression to the video data collected.
When described video server end is compressed video data, adopt inter prediction and intraframe predictive coding to remove redundant information, to improve video compression efficiency; Adopt the Integer DCT Transform decoding end can distortion, not there will be the mistake coupling, adopt addition and shifting function to substitute multiplication, reduced the operand of whole algorithm; The entropy coding further compresses for the null value occurred after quantizing, and the coefficient after residual block is quantized is encoded, and removes statistical redundancy.
The directed Wi-Fi antenna that the wireless transmitter module of described video server end is low-power consumption, adopt the RTSP agreement by the data rear transmission of being encoded, the video browser end utilizes the Wi-Fi access point to realize the reception of wireless video data by the form of RTSP protocol access server end by computer.
Advantage and good effect that the present invention has are:
This system has realized the long-distance transmissions of 720P high-definition image under limited wireless bandwidth condition, and transmitting end device has the characteristics such as lightweight, low-power consumption, be convenient to the expanded application on the mobile device limited in load-carrying, help solve such as major natural disasters scene, large-scale mass-meeting and important security scene etc., the commanding in the rear personnel need to understand in time the problem of real time information, to improve accuracy and the promptness of reply decision-making, increase work efficiency.This system is mainly used in HD video remote wireless transmission in all conglomeraties and field.
The accompanying drawing explanation
Fig. 1 is the structure chart of the video server end of lightness high-definition video wireless transmission system of the present invention;
Fig. 2 is the H.264 transmission of video functional block diagram based on RTP/UDP of lightness high-definition video wireless transmission system of the present invention;
Fig. 3 is single-frequency Wireless Mesh structure chart of the present invention;
Fig. 4 is the information interaction function diagram of video browser end of the present invention and video server end.
Embodiment
Below in conjunction with the drawings and specific embodiments, lightness high-definition video wireless transmission system of the present invention is described in detail.
Lightness high-definition video wireless transmission system of the present invention, comprise video server end and video browser end, video server end and video browser end carry out Wireless Data Transmission by Mesh network (multihop network), with flow processs such as the collection that completes high-resolution video, coding, wireless transmission, decoding, real-time playbacks.The video server end comprises kernel processor chip and the wireless transmitter module be connected with kernel processor chip, is provided with image capture interface on kernel processor chip; The video browser end adopts computer and the client video tour software based on windows platform.
Described image capture interface is the high-definition video signal input interface, for connecting the equipment such as ccd image sensor, cmos image sensor or DV video camera.
Fig. 1 is the structure chart of the video server end of lightness high-definition video wireless transmission system of the present invention.As shown in Figure 1, the video server end utilizes TMS320DM368 type processor as kernel processor chip, the video processing subsystem that utilizes chip carries out collection and the preliminary treatment of raw video signal to the signal of image capture interface input, and uses inner integrated coding and decoding video coprocessor to complete most Video compression work.Utilize H.264/AVC compression standard to carry out the high compression ratio compression to the video collected, and the H.264 algorithm of increasing income is improved, good network adaptability, anti-dropout performance and anti-error code, make it meet wireless video transmission to the low delay of video flowing, low code check requirement.
The directed Wi-Fi antenna that the wireless transmitter module of video server end is low-power consumption, characteristics for wireless video transmission to picture hysteresis sensitivity, the video server end adopts RTSP (real time streaming transport protocol) to carry out RTP encapsulation packing to compressing video frequency flow, with real-time and the stability of guaranteeing HD video, and the Mesh network that utilizes EMAC module that the TMS320DM368 kernel processor chip carries to coordinate a plurality of Wi-Fi AP to form, with the error code that adapts to better transmission channel under complex electromagnetic environment, disturb, the robustness of raising system, the stability of enhancing system image quality, realize the wireless transmission of 720P HD video data.
H.264 in, adopt inter prediction and intraframe predictive coding to remove redundant information, to improve video compression efficiency; Adopt the Integer DCT Transform decoding end can distortion, not there will be the mistake coupling, adopt addition and shifting function to substitute multiplication, reduced the operand of whole algorithm; The entropy coding further compresses for the null value occurred after quantizing, and the coefficient after residual block is quantized is encoded, and removes statistical redundancy.
The course of work of video server end is as follows:
The STM320DM368 chip carries out data acquisition to the video camera of plugging into or CCD chip and obtains the 720P video code flow, utilize VPSS (Video Processing Subsystem, video processing subsystem) Video processing in, VPFE in VPSS (Video processing front end) utilizes ISIF (image sensor interface) to be controlled the video flowing obtained by transducer and parameter such as arranges at the preliminary treatment, then will be from the CCD/CMOS uncorrected data to YCbCr-4:2:2 or the YCbCr-4:2:0 data transaction by programmable image passage (IPIPE).Data after conversion are stored in SDRAM (Synchronous Dynamic Random Access Memory by DMA (direct memory access) passage, synchronous DRAM) in, then by HDVICP (high definition encoding and decoding coprocessor) by the processing of encoding of dma mode transmitting video data.
HDVICP in DM368 compresses processing to the yuv format vision signal, and compression algorithm is used H.264 standard.H.264 in, adopt the mode of predictive transformation, quantization encoding and statistical coding to eliminate the redundant information in the video information of front-end collection: at first, to carry out Motion estimation and compensation and eliminate the time redundancy existed between consecutive frame.Again the residual error after motion compensation is carried out to integer transform and eliminate spatial redundancy.Next conversion coefficient is quantized to eliminate visual redundancy, finally the coefficient after quantizing and motion vector are carried out to entropy coding elimination statistical redundancy, finally obtain the compressed bit stream of standard.
The normal video code stream obtained transfers to SPI interface (the Serial Peripheral Interface of full duplex by dma controller, serial peripheral interface), SPI interface and COFDM (Coded Orthogonal Frequency Division Multiplexing, being Coded Orthogonal Frequency Division Multiplexing (COFDM)) the corresponding SPI interface of module is connected, the highest 20MHz that is set to of CLK lineman's working frequency of DM368SPI interface, regulate requirement with the transmission rate that meets video code flow, video stream packets length is 188 bytes.
Fig. 2 is the H.264 transmission of video functional block diagram based on RTP/UDP of lightness high-definition video wireless transmission system of the present invention.As shown in Figure 2, utilizing RTSP (Real Time Streaming Protocol, real time streaming transport protocol) in the process that H.264 video is transmitted: the RTP package module is mainly that the H.264 video flowing after compression is encapsulated to packing; RTCP (Real-time Control Protocol, RTCP Real-time Transport Control Protocol) analysis module is responsible for generating and sending the RTCP bag, and analyzes the RTCP bag of regaining; QoS (Quality of Service, service quality) feedback control module, according to the RR message feedback information of receiving, is adjusted dynamically to the transmission rate of RTCP bag; Send buffer module and port is set to send RTP (Real-time Transport Protocol, RTP) bag and RTCP bag; UDP (User Datagram Protocol, User Datagram Protoco (UDP)) directly communicates by letter with ethernet physical layer and carries out the transmission of video RTP bag.Video flowing after coding continues by DMA (Direct Memory Access, direct memory access) bus transfer to Ethernet MAC controller EMAC.
Fig. 3 is single-frequency Wireless Mesh structure chart of the present invention.As shown in Figure 3, single-frequency Wireless Mesh structure chart, Mesh network wireless transmission principle is as follows: Wi-Fi standard commonly used is IEEE802.11n at present, 2.4GHz and 5.8GHz frequency range have been comprised, maintenance is backward compatible to 802.11b/g/a's, at present by MIMO (Multiple-Input Multiple-Output, multiple-input and multiple-output), the technology such as OFDM (Orthogonal Frequency Division Multiplexing, OFDM) can reach the transmission speed of 320 ~ 600Mbps.
The video browser end utilizes the Wi-Fi access point to realize the reception of wireless video data by the form of RTSP protocol access server end by computer.On the PC of client platform, utilize VS2008 to develop and comprise the video browser software that transmission rate detects, the IE browser kernel and the video decode plug-in unit that use the Windows system to carry, according to the image code stream that H.264/AVC compression standard is received the communication module end, decoded, finally generate the 720P digital video sequences of YCbCr-4:2:0 standard, realize the decoding of compressing video frequency flow and demonstration in real time.
In native system, be to utilize Wi-Fi AP (Wi-Fi AccessPoint, wireless access points) approach is transferred to the RTP of video data bag in the wireless channel of 5.8GHz frequency range, AP is one of part formed wireless network, the every 0.1s of AP by SSID (Service Set Identifier) via the broadcast of beacons (signal station) package once, the transmission rate of beacons package is 1Mbps, and bag is long shorter, whole broadcast action is less to the performance impact of network, can guarantee that the Wi-Fi network interface card of client rs PC can receive the broadcasting packages of this SSID.After connecting, what form an interim establishment between the service end in wireless video transmission system and client rs PC controls network without the central distribution formula, starts the transmission of video packets of data under the instruction of PC end.
When wireless video transmission system is carried to when remote, be that the video server end has broken away from the communication range with pc client, can utilize other AP to forward video flowing as relay point and complete multi-hop communication, such transmission form is called as Mesh network (multihop network).In the process of transfer of data, when certain Wi-Fi AP node breaks down, system can select a near node to continue communication, and the existence due to Wi-Fi AP, it has also played to wireless signal the effect that relaying amplifies, so the Mesh network has advantages of robustness, non line of sight transmission, easily deployment, flexible structure, high bandwidth.
In conventional wireless video transmission, system wireless Mesh netword used, in order to reduce application cost, is arranged in a linear a plurality of single-frequency AP usually as far as possible, is set to single-frequency Mesh structure.The Wi-Fi AP node that A is the video server end, the Wi-Fi AP node that H is video tour software end, its most efficiently communication stream to as shown in Figure 3.
Fig. 4 is the information interaction function diagram of video browser end of the present invention and video server end.As shown in Figure 4, in order to realize the wireless transmission of HD video, the video server end need to be by video flowing H.264 by the Wi-Fi Internet Transmission to the video browser end, in the RTSP agreement, the information interactive process of video server and browser software is as follows:
Video browser software is initiated RTSP OPTION request by PC, to obtain the supplying method of video server, returns to corresponding support method after server end receives, and in system, uses: DESCRIBE, SETUP, TEARDOWN, five kinds of modes such as PLAY.
Browser software is initiated RTSP DESCIBE request Concurrency and is sent session description information, the information spinner that video server is received will comprise: media name, decoder type, video resolution, user's decoding capability etc., and return and comprise that media parameter that media name, frame rate, sample rate, type of coding, host-host protocol etc. are necessary is to browser software.
Browser software is initiated the request of RTSP SETUP, and purpose is that transmission is set up and prepared to queued session.After video server is just received, for RTP/RTCP creates the UDP socket, and respond port numbers and session indications.
Browser software is initiated the request of RTSP PLAY, and purpose is that real-time video is play in request.Video server is made the corresponding information that comprises session indications, RTP packet number, timestamp etc. immediately, again video flowing is H.264 carried out to the RTP encapsulation, and current state is set is Playing, the rtp thread thread of video server program is checked through after the Playing state transmission that just starts the RTP packet.
Browser software is initiated the request of TEARDOWN, is in order to stop the RTSP agreement.Service end, after receiving this message, can be closed current connection, stops the transmission of RTP packet, and the information such as IP address of the PC that browser software is moved are deleted from the list of safeguarding.
The present invention has abandoned the legacy single hop network wireless transmission means that causes systemic breakdown due to node failure, adopts the wireless mesh network transmission, has the advantages such as robustness is good, flexible structure, high bandwidth, non line of sight transmission.
Claims (5)
1. a lightness high-definition video wireless transmission system, it is characterized in that: this transmission system comprises video server end and video browser end, video server end and video browser end carry out Wireless Data Transmission by the Mesh network; The video server end comprises kernel processor chip and the wireless transmitter module be connected with kernel processor chip, is provided with image capture interface on kernel processor chip; The video browser end adopts computer and the client video tour software based on windows platform.
2. lightness high-definition video wireless transmission system according to claim 1, is characterized in that: image capture interface connection ccd image sensor, cmos image sensor or DV camera apparatus.
3. lightness high-definition video wireless transmission system according to claim 1, it is characterized in that: the video server end utilizes H.264/AVC compression standard to carry out the high compression ratio compression to the video data collected.
4. lightness high-definition video wireless transmission system according to claim 3, is characterized in that: when the video server end is compressed video data, adopt inter prediction and intraframe predictive coding to remove redundant information, to improve video compression efficiency; Adopt the Integer DCT Transform decoding end can distortion, not there will be the mistake coupling, adopt addition and shifting function to substitute multiplication, reduced the operand of whole algorithm; The entropy coding further compresses for the null value occurred after quantizing, and the coefficient after residual block is quantized is encoded, and removes statistical redundancy.
5. lightness high-definition video wireless transmission system according to claim 1, it is characterized in that: the directed Wi-Fi antenna that the wireless transmitter module of video server end is low-power consumption, adopt the RTSP agreement by the data rear transmission of being encoded, the video browser end utilizes the Wi-Fi access point to realize the reception of wireless video data by the form of RTSP protocol access server end by computer.
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