Application scope of video capture card

Video capture cards are widely used in security monitoring, education courseware recording, large screen splicing, multimedia recording video, conference recording, virtual studio, virtual reality, security X-ray machine, radar image signal, VDR recorder, medical X-ray machine, endoscopy, CT machine, gastrointestinal machine, colposcopy, industrial inspection, intelligent transportation, medical imaging, industrial monitoring, instrumentation, machine vision and other fields.

Video systems consisting of video capture cards, interactive whiteboards, and other video hardware are commonly used for image acquisition/image analysis/processing/video conferencing/digital monitoring.

Government: remote work conference, government procurement conference, remote statistics and collaboration, government bidding conference, personnel recruitment and assessment, mass government consultation, letters and visits, public **** health command

Finance: financial work conference, remote customer service, office meetings, e-commerce, remote consulting, operational guidance, roadshows, remote recruitment and training

Enterprise: Regular corporate meetings, remote business negotiations, collaborative office, remote recruitment, agents and channelers remote training, technical seminars, administrative offices, internal training and learning, branch meetings, remote customer service, remote monitoring

Medicine: remote consultation, remote medical consultation, remote medical communication

Education: multimedia teaching video live recording, network education and training, remote tutoring and counseling, examination monitoring, parents' meetings, off-site academic exchanges, remote teaching observation classes

Public Prosecutors, Law Enforcement, Forces: teleconferencing, remote collaborative operations command, remote police command, remote interrogation, remote visitation, courtroom live broadcasts, emergency command

Operations: telecommunication-grade web conferencing services, instant messaging services, VOIP, PSTN

Information and Media: television interaction

Video capture card applications

Electronic equipment has been from obscurity and thus into people's daily lives, in the face of the market's ever-changing monitoring products, as well as constantly updated monitoring card offer, people are always confused, so we only continue to understand the monitoring market, as well as monitoring technology in order to be invincible.

With the continuous development of information technology, computer technology into the field of video capture, video processing, video information processing with computers and digital transmission of video data in many areas have been widely used in our aircraft test flights have also been a large number of applications.

The use of image acquisition chipset to complete the acquisition of images, frame memory address generation and image data refresh; in addition to the acquisition mode to set up, the main processor is not involved in the acquisition process, we only need to take out the acquisition of video data in the appropriate frame memory address to get the corresponding video data, this method, whether in function, performance, reliability, speed and so on have been significantly improved. This method, whether in function, performance, reliability, speed and other aspects have been significantly improved, but the cost is high. The latter uses a general-purpose video A/D converter to realize the acquisition of images, which is characterized by data acquisition occupies the CPU time, the processor speed requirements, low cost, easy to implement, to meet the needs of certain image acquisition system.

This system requires a maximum of 25 frames per second (set to adjustable), the client real-time display of a maximum of 25 frames (set to adjustable), saved in MPEG4 format, the screen requirements for the maximum resolution of 1024X768. multi-channel real-time video acquisition using the VisionRGB-PRO card (Datapath UK), the card can be real-time acquisition of two-way video data, which basically meets the requirements of this system. Video data, basically meet the requirements of the system, and then a VGA matrix switcher will be the front-end data source of the four-way video data for artificial switching acquisition.

Hardware environment construction

This acquisition system mainly realizes the artificial switching real-time acquisition of the front-end four-way video data, the server side can simultaneously collect and store two-way video data (only a video capture card is used here), you can also collect only one-way video data, and then real-time transmission through the network to the client display, the server side of the real-time display of the captured video. In the video switching can be switched on the server side or the client side of their own switching, on the server side can be operated through the serial port VGA matrix switching for the corresponding video input and output port switching, on the client side can be switched through the network - the corresponding module of the server program - serial port - VGA matrix switching for the corresponding video input and output port switching.

Video data volume is large, which requires video data processing system with real-time acquisition, high-capacity storage and real-time processing characteristics. Software to achieve real-time capture of video data (up to two), control the video interface, the video data real-time encoding and storage and sent to multiple clients. The realization of the server side is the key to the whole system, where it also undertakes a lot of work, so it is inevitable that the software and hardware requirements are also very high. These are the main functions to be realized on the server.

In the acquisition of the most important thing is to have real-time, in this event-driven method to obtain data from the port, the acquisition of video data streams in the desktop display at the same time and then encoded to save the video acquisition of the data should be set by the corresponding module of the software as a bitmap type of video frames, in order to facilitate the display and encoding of the server side of the preservation of the Divx encoding is used in Divx encoding, the formation of MPEG4 frames in the format of the Divx encoding. The Divx encoding is used here, and the Divx encoding results in an MPEG4 stream formatted as frames.

Server-side implementation

Divx decoding is also decompressed in frame format, so it is advantageous to send the data to the client to send the video data stream in frame units. Media streams are divided into four streams: video streams, audio streams, text streams, MIDI streams, with a video card captured two video streams, save each video stream with an additional text stream, text streams should be added to the customer's request for the server time and some human-typed text messages, in the record of the two media streams there are generally two ways to record the record, the video streams and text streams are recorded in a file is used in the way, this is conducive to file later saved In this way, it is favorable to save and check the file later. In the acquisition of software to realize the main application of the corresponding SDK (Softwaredevelopmentkit) and API (Application Programming Interface), but also available VFW (VideoforWindows). But the latter method to achieve a simple single video capture card can be, for multi-channel video capture with the first method is more flexible, but the realization of more complex than the second.

In the server side of the coordination of all aspects of the work is the key, the program starts first default last set of video capture card channel, such as video data on the display, save, if there is no video data on the wait, if you want to adjust the video capture card channel available to the serial port to the VGA matrix switcher sends the appropriate commands to let the VGA matrix switcher to carry out the corresponding input and output channel switching. Can also be through the client through the network to the server serial port to the VGA matrix switcher VGA matrix switcher for the corresponding input and output channel switching (in the back of the introduction of the client and then introduced). After each switch will automatically save the original video file, such as switching video data will automatically regenerate a new video file.

The real-time transmission of video data by LAN has been used in a large number of applications in a number of fields, LAN to wired LAN mostly, because wired LAN technology is mature, fast transmission speed, but a long time to transmit a large amount of video data can also cause transmission rate instability, causing data blockage, which will lead to a substantial decline in the quality of video transmission, easy to cause the screen ghosting, jitter, screen, delay and other phenomena. Phenomenon.

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In order to effectively deliver real-time media streams over a LAN with high quality, a variety of technologies are required, including the selection of network transport layer protocols, coding (decoding) technologies, and network transport layer quality control technologies.