CN116016845A - Multifunctional split type wireless image transmission system - Google Patents
Multifunctional split type wireless image transmission system Download PDFInfo
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- CN116016845A CN116016845A CN202211553989.XA CN202211553989A CN116016845A CN 116016845 A CN116016845 A CN 116016845A CN 202211553989 A CN202211553989 A CN 202211553989A CN 116016845 A CN116016845 A CN 116016845A
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Abstract
The invention provides a multifunctional split wireless transmission system, which comprises: the front-end camera supports the UVC protocol and can output standard MJPEG or YUV image formats; the video encoder packages video data output by the front-end camera into streaming media data, the streaming media data is output to a local area network by the wireless network card, and the battery pack supplies power to the front-end camera and the rear-end host. The multifunctional split wireless transmission system provided by the invention is split in design, has small front end size, does not need independent power supply, and is suitable for various fine scenes.
Description
Technical Field
The invention relates to the technical field of image transmission, in particular to a multifunctional split type wireless image transmission system.
Background
The existing split wireless image system is mostly developed based on scenes such as unmanned aerial vehicle, robot, bus-mounted images and the like, and an AHD camera is generally adopted at the front end, and is transmitted to the rear end through coaxial line transmission or wireless radio frequency transmission and then digitally encoded. Because AHD cameras generally employ fixed focus lenses, auto-focusing cannot be realized generally, many applications of such systems in fine, macro shooting scenes are unchanged.
The other type of products are high-end video camera products such as broadcasting video cameras, single-lens reflex cameras, conference cameras, industrial cameras and the like or PC computer signals based on professional high-definition signal sources such as HDMI/SDI and the like for image transmission. The problems with these sources are:
1. often, independent power is required to be usable, for example, a single-lens reflex camera cannot be powered only by HDMI/SDI cable.
2. Such cameras tend to be relatively bulky and are not suitable for use in fine scenes.
3. Such cameras tend to be expensive and are not suitable in many fields.
4. Such cameras often require additional configuration control systems, and even though there is a technology for transmitting control signals using HDMI/SDI signal lines at present, the technology is still not widely applied and does not form a unified technical standard. For example, sony brand broadcast television cameras are not necessarily compatible with toshiba brand signal standards.
Disclosure of Invention
In order to make up for the defects in the prior art, the invention provides a multifunctional split wireless transmission system, which is split in design, small in front end size, free of independent power supply and suitable for various fine scenes.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a multi-functional split wireless transmission system comprising:
the front-end camera supports the UVC protocol and can output standard MJPEG or YUV image formats;
the video encoder packages video data output by the front-end camera into streaming media data, the streaming media data is output to a local area network by the wireless network card, and the battery pack supplies power to the front-end camera and the rear-end host.
Further, the system also comprises a streaming media playing terminal, wherein the streaming media playing terminal is connected to the local area network and is used for pulling the streaming media data and displaying the front-end camera picture. The streaming media playing terminal may be any hardware, software or both components having the above functions, such as a combination of a decoder and a display, a PC and a display in which the streaming media playing software is installed.
Further, the coding protocol supported by the video encoder is H.264/H.265, and HLS, RTSP, RTMP or SRT transmission protocol is adopted for the streaming media data.
Further, the front-end camera can be powered by a low-voltage direct-current cable or a USB cable.
Furthermore, the back-end host is also internally provided with a singlechip and a serial port, and the video encoder can be connected with the front-end camera through the singlechip and the serial port.
Furthermore, a direct-current power output interface and a direct-current power charging interface are also arranged in the back-end host, and the power manager is connected with the video encoder, the singlechip, the direct-current power output interface and the direct-current power charging interface.
Furthermore, the back-end host is also provided with physical keys and a liquid crystal touch screen, which are used for displaying the front-end camera picture and realizing man-machine interaction.
Furthermore, the APP is debugged, runs on the mobile phone/tablet terminal and is connected with the local area network, and is used for monitoring or controlling the front-end camera, modifying the parameters of the video encoder and modifying the network parameters of the back-end host.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the multifunctional split wireless transmission system, the front-end camera and the rear-end host are independent respectively, the video encoder and the battery pack are integrated on the rear-end host, the front end does not need to be powered by an independent battery, and the size of the front-end camera can be reduced; the back-end host can convert the standard USB camera signal into a standard network streaming media signal, and outputs the streaming media signal through a wireless network, so that the back-end host can freely select various hardware or software to pull the streaming media to obtain the picture of the front-end camera, is flexible and convenient to apply, and is suitable for various fine scenes.
Drawings
FIG. 1 is a diagram of the overall physical architecture of a multi-functional split wireless transmission system of the present invention.
Fig. 2 is a physical architecture diagram of a back-end host of the present invention.
Fig. 3 is a diagram of the overall software architecture of the video encoder of the present invention.
Fig. 4 is a flow chart of wireless video transmission of the present invention.
Fig. 5 is a flowchart of the external system control front-end camera of the present invention.
Fig. 6 is a flow chart of the external system control front-end camera of the present invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly practiced by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
As shown in FIG. 1, a multifunctional split wireless transmission system is mainly composed of a front-end camera, a back-end host, a streaming media playing terminal and a debug APP, and is connected with a local area network through connecting wireless wifi equipment (such as an AP or a wireless router), and then is connected with using equipment in the local area network.
The front-end camera supports UVC protocol and can output standard MJPEG or YUV image format, and the power supply mode is powered by low-voltage direct current cable or USB cable. The front-end camera may select different types of cameras according to the use scenario to achieve multiple uses, such as: if the front-end camera adopts a head-mounted structure, the front-end camera can be used for shooting a first person viewing angle; the front-end camera is designed into a video conference camera, and the wireless serial port transparent transmission function is combined to realize wireless transmission of the video conference; the front-end camera is replaced by an endoscope, so that medical application is realized.
And the streaming media playing terminal is accessed into the local area network and is used for pulling streaming media data of the back-end host and displaying the front-end camera picture. As shown in fig. 1, the streaming media playing terminal may be any hardware, software or a combination of both having the above functions, such as a combination of a decoder and a display, a PC and a display in which streaming media playing software is installed, or third party software. The third party software refers to various systems needing to acquire the pictures of the front-end camera, and can be a network monitoring video recorder, a third party streaming media server and the like, and the streaming media of the front-end camera can be used for video recording, live broadcast, secondary coding, AI analysis and the like after being acquired.
As shown in fig. 2, the back-end host consists of a physical key, a liquid crystal touch screen, a USB controller, a wired network card, a wireless network card, a serial port, an electric quantity charging indicator, a direct current power output interface, a power switch, a direct current power charging interface, a power manager, a single-chip microcomputer, a video encoder and a battery pack.
The back-end host is connected with the front-end camera through the USB controller and is connected with the local area network through the wireless network equipment. The wireless network device employs a conventional wireless AP or wireless router that supports the 802.11 family of protocols on the market. Of course, the back-end host can also be connected with the local area network switch through a cable network card by a network cable.
The video encoder may compress and encode the video data (typically in YUV, MJPG, etc. data formats) of the front-end camera acquired based on the UVC protocol into video data in h.264/h.265 format, and package the video data into network streaming media data by the internal streaming media server (HLS, RTSP, RTMP, SRT, etc. standard transmission protocol).
The physical key, the liquid crystal touch screen, the USB controller, the wired network card and the wireless network card are all connected with the video encoder and communicated. The front-end camera can be directly powered by the USB controller or is additionally connected with a power supply line to the direct-current power supply output interface for power taking. The video encoder and the singlechip are powered by a power manager.
The electric quantity charging indicator lamp is composed of 5 LED lamps, the on-off state is controlled by a single chip microcomputer, 4 electric quantity indicator lamps are used for indicating that the residual electric quantity is less than or equal to 25%, less than or equal to 50%, less than or equal to 75% and less than or equal to 100%, and 1 charging indicator lamp is used for indicating whether the current equipment is connected with a DC charger or not.
The power manager is connected with the battery pack, detects a real-time voltage value of the battery pack, transmits the real-time voltage value to the singlechip, calculates the residual electric quantity according to the current voltage value by the singlechip, and controls the electric quantity charging indicator lamp to respectively light 1, 2, 3 and 4 LED lamp beads in the states of the residual electric quantity of less than or equal to 25%, less than or equal to 50%, less than or equal to 75% and less than or equal to 100%.
The power manager may be connected to a DC charger. When the power supply is connected, the power supply manager transmits the state to the singlechip in real time, and the singlechip immediately lights the charging indicator lamp. The power manager performs power control according to the following rules:
because the singlechip is connected with the electric quantity charging indicator lamp, when the situation 3 is that the power switch is in the off state, but when the charger is connected, the power supply of the singlechip is kept on, so that the singlechip can control the electric quantity charging indicator lamp to display the real-time electric quantity condition, and a user can know the current charging state.
Debugging APP, running on the mobile phone/tablet terminal and connecting with local area network, the main functions are:
1. monitoring the picture of the front-end camera;
2. controlling a front-end camera: picture enlargement and reduction, rotation of a tripod head and the like;
3. modifying parameters of a video encoder: code rate, frame rate, I-frame interval, resolution, color, brightness, etc.;
4. modifying network parameters of the back-end host: the IP address of the network card, the SSID of the wireless network, the password and the like.
The application method for realizing the functions comprises the following steps: firstly installing and debugging an APP on a mobile phone/tablet, and then adjusting a back-end host to an AP mode through operation modes such as a physical key or a liquid crystal touch screen; and then the mobile phone/tablet is connected to the WLAN generated by the back-end host, and the back-end host allocates an IP address for the mobile phone/tablet. And then the debugging APP is opened on the mobile phone/tablet, and the debugging APP can automatically initiate a request to the fixed IP of the wireless network card, so that the wireless network card can be connected with a back-end host. Then, the debug APP can perform operations such as video streaming request, live broadcast watching, image quality debugging, recording control, push-pull stream control and the like.
Referring to fig. 3, from an overall point of view, the key relevant software functional modules of the multifunctional split wireless transmission system of the present invention are divided into a driving layer, a transmission protocol layer, a data layer and an application layer.
The driving layer is responsible for controlling IO equipment, for example, a USB controller driver is responsible for being connected with a USB camera, and the wireless network card is responsible for being connected with wifi equipment.
The transport protocol layer is responsible for encapsulating various data of the data layer and transmitting the data according to a standard transport protocol, for example, encapsulating H.264/H.265 data into streaming media. Meanwhile, the transport protocol layer is also responsible for analyzing the data packet received from the external device, for example, analyzing the data transmitted by the front-end camera through the UVC protocol to obtain MJPEG or YUV data.
The data layer is mainly responsible for caching video data or control instructions.
The application layer is mainly responsible for processing data and instructions, and simultaneously provides a WEB page as human-computer interaction in a B/S form, or provides an API interface for communicating with PC client software or mobile phone APP, so that the human-computer interaction in a C/S form based on the PC client or mobile phone APP is realized.
Referring to fig. 4, the wireless video transmission implementation process of the system is as follows: the front-end camera is connected to a USB interface of the back-end host through a USB cable, the USB controller drives the front-end camera to acquire video stream based on UVC protocol, the video stream is analyzed to obtain MJPEG data or YUV data, the MJPEG data or the YUV data is transmitted to the video decoder to be decoded into YUV data, the YUV data is transmitted to the video encoder to be encoded into H.265 or H.264 data, the H.265 or the YUV data is transmitted to the streaming media server to be packaged into streaming media data, and the protocol can be RTSP, RTMP, HLS, SRT and the like (without limiting the streaming media protocol). The streaming media server is respectively bound to the wired network card and the wireless network card, and the external user equipment can request streaming media data after accessing to the same local area network through wireless wifi.
The front-end camera of the system has two control modes:
first, referring to fig. 5, wireless control of the front-end camera is achieved through UVC protocol conversion. The external system sends out instructions based on VISCA, onvif, palco and other protocols to reach the protocol converter through the wireless network card drive or the wired network card drive through HTTP/UDP/TCP and other protocols, and the front-end camera is controlled by the USB drive after the instructions are converted into UVC protocols.
Second, referring to fig. 6, through serial port signal transparent transmission, wireless control on a front-end camera or other serial port devices (such as a mechanical holder, an electronic switch, a zoom lens, etc.) matched with the front-end camera is realized. The external system sends out instructions based on VISCA, onvif, palco and other protocols to reach the protocol converter through HTTP/UDP/TCP and other protocols through a wireless network card drive or a wired network card drive, and after the instructions are converted, the singlechip controls the front-end camera through RS232/485/422 and other serial protocols.
Although the present invention has been described in detail with reference to the embodiments, it should be understood that the invention is not limited to the preferred embodiments, but is capable of modification and equivalents to some of the features described in the foregoing embodiments, but is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. A multi-functional split wireless transmission system, comprising:
the front-end camera supports the UVC protocol and can output standard MJPEG or YUV image formats;
the video encoder packages video data output by the front-end camera into streaming media data, the streaming media data is output to a local area network by the wireless network card, and the battery pack supplies power to the front-end camera and the rear-end host.
2. The multi-functional split wireless transmission system of claim 1, wherein: the system also comprises a streaming media playing terminal, wherein the streaming media playing terminal is connected to the local area network and is used for pulling the streaming media data and displaying the front-end camera picture.
3. The multi-functional split wireless transmission system of claim 2, wherein: the coding protocol supported by the video coder is H.264/H.265, and the streaming media data adopts HLS, RTSP, RTMP or SRT transmission protocol.
4. A multi-functional split wireless transmission system as claimed in claim 3, wherein: the front-end camera is powered through a low-voltage direct-current cable or a USB cable.
5. The multi-functional split wireless transmission system according to any one of claims 1-4, wherein: the video encoder can be connected with the front-end camera through the singlechip and the serial port.
6. The multi-functional split wireless transmission system of claim 5, wherein: the back-end host is also internally provided with a direct-current power supply output interface and a direct-current power supply charging interface, and the power supply manager is connected with the video encoder, the singlechip, the direct-current power supply output interface and the direct-current power supply charging interface.
7. The multi-functional split wireless transmission system of claim 6, wherein: the back-end host is also provided with physical keys and a liquid crystal touch screen, and is used for displaying the front-end camera picture and realizing man-machine interaction.
8. The multi-functional split wireless transmission system according to any one of claims 1-4, wherein: and the debugging APP is operated at the mobile phone/tablet terminal and connected with the local area network and is used for monitoring or controlling the front-end camera, modifying the parameters of the video encoder and modifying the network parameters of the back-end host.
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| CN101232608A (en) * | 2007-12-29 | 2008-07-30 | 重庆市迪马实业股份有限公司 | Double channel video image transmission system |
| CN102413320A (en) * | 2011-12-21 | 2012-04-11 | 上海大学 | Method for realizing wireless network intelligent video monitoring system |
| CN105681307A (en) * | 2016-01-21 | 2016-06-15 | 北京中视文广科技有限公司 | Portable camera audio and video coding, storage and network transmission device |
| CN110166743A (en) * | 2019-04-04 | 2019-08-23 | 四川电科安研视讯科技有限公司 | A kind of wireless video transmission system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101232608A (en) * | 2007-12-29 | 2008-07-30 | 重庆市迪马实业股份有限公司 | Double channel video image transmission system |
| CN102413320A (en) * | 2011-12-21 | 2012-04-11 | 上海大学 | Method for realizing wireless network intelligent video monitoring system |
| CN105681307A (en) * | 2016-01-21 | 2016-06-15 | 北京中视文广科技有限公司 | Portable camera audio and video coding, storage and network transmission device |
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