Development Status and Trend of Video Capture Cards

Video capture card development status Video capture card (VideoCapturecard) is also called video card. It is a mixed video data, video data, or video audio output from an analog video camera, video recorder, LD video player, or TV, and is converted into computer recognizable data. The digital data is stored on a computer and becomes an editable video data file. According to their use can be divided into broadcast video capture card, professional video capture card, civil video capture card.

Most video capture cards have the function of hardware compression. When the video signal is collected, the video signal is first compressed on the card, and then the compressed video data is transmitted to the host through the PCI interface. The general capture card uses the intra-frame compression algorithm to store the digitized video as an AVI file, and some high-end video capture cards (hard compression cards) can directly compress the collected digital video data into MPEG-1 format files in real time.

With the continuous development of information technology, computer technology has been introduced into the field of video capture and video processing. Using computer to process video information and digitally transmit video data have been widely used in many fields. There are many methods for capturing video images, which can be basically divided into two categories: digital signal acquisition and analog signal acquisition.

The analog capture card captures the analog video signal into the PC through the AV or S terminal, and converts the analog signal into a digital signal. The video signal source can be from analog cameras, television signals, analog video recorders, and the like.

Digital acquisition card through the IEEE1394 digital interface, in the form of digital to digital, digital video signal losslessly collected to the PC, the video signal source mainly from DV (digital video camera) and other digital devices.

An important difference between the analog capture card and the digital capture card is that using a digital capture card, the video signal is not lost during the acquisition process, and the same effect as the original video source can be ensured. However, if the analog capture card is used, the video signal will have a certain degree of Loss.

With the high-speed development of the high-definition industry, digital devices have begun to fully popularize high-definition, targeting the needs of users of the streaming media industry, Vivivision launched a high-definition VGA capture card (1080P), high-definition DVI capture card (1080P), high-definition HDMI capture card (1080P) solves the need for various high-definition devices and supports video software developed with various Directshow standards, and provides a complete secondary development package SDK HD video capture device.

High-definition becomes the development theme of video capture cards With the increasing popularity of high-definition capture and display devices, especially the large-scale use of high-definition cameras and large-screen display devices, the problem of inconsistent refresh frequencies of capture devices and display devices becomes more and more serious. In the display market LCD dominates. Since the LCD screen maintains the display characteristics (the image maintains a certain brightness for each frame of display time) and is integrated with the visual persistence feature of the human eye, when the screen is large and the refresh rate is not high, it may cause a dynamic view of the viewing dynamic picture. , resulting in reduced dynamic object resolution and visual fatigue. For video surveillance applications, the current video capture device capture frame rate is generally 25 frames per second or 30 frames, while the display device's mainstream refresh rate is 50Hz or 60Hz, higher than the acquisition device.

With the rapid development of the video field, video capture cards have been widely used in various industries. HD capture cards have gradually replaced standard definition capture cards. This has become the trend of the market. With the continuous development of high-definition video capture cards, high-definition cards have become the only way for the development of the industry, and their applications have become more and more mature.

The rapid development and popularization of high-definition application streaming media video and audio capture cards have provided strong market momentum for the development of streaming media services, and streaming media services are becoming increasingly popular. Professional HD VGA streaming media capture card technology is widely used in all aspects of Internet information services such as multimedia news release, online live broadcast, online advertising, e-commerce, video on demand (VOD), distance education, telemedicine, online radio, real-time video conferencing and other Internet information services. The application of streaming media technology will bring about revolutionary changes in the network information exchange and have a profound impact on people's work and life. The following describes the application of streaming media technology in video on demand, distance education, video conferencing, and Internet live streaming.

1, computer display screen signal capture in the electronic classroom, game live, video conferencing, projection fusion applications need to capture the computer screen real-time capture. Use T220E or T620E high-definition audio and video streaming media capture card, you can real-time high-definition computer VGA screen signal acquisition and storage to your computer. Especially the T620E HD dual-channel video capture card, which can simultaneously achieve two high-definition computer screen signal acquisition, and can synchronize audio transmission in real time, each resolution can reach 1920x1080. This is very advantageous for computer screen capture.

2. High-definition camera video signal acquisition High-definition VGA/DVI/HDMI streaming media capture card, which can collect a variety of video camera signals, including VGA camera, HDMI camera and DVI interface camera signal. Can also be high-definition set-top box HDMI image effects collected to the computer, using professional software to digitally compare the differences between the HD set-top box program debugging differences, reducing the visual judgment and camera screen shot caused by the resolution, color output error, speed up the development Process and guarantee accuracy. The universal video capture card is used to map the HD set-top box operation menu to create a help document and manual. It solves the problem of blurring the virtual image captured by the camera and unable to capture the dynamic effect screen, greatly improving the competitiveness of the company.

3, education recording broadcast editing and editing high-definition VGA / DVI / HDMI streaming media capture card, ideal for teaching in the use of recording and broadcasting. Simultaneous multi-channel audio and video signals can be collected in high-definition at the same time, with high-definition cameras for excellent courseware recording, audio and video fully synchronized, through the support of Microsoft Directshow architecture third-party software, teachers can teach video sound, student question and answer video and other real-time recording The standard streaming media format required by the national exquisite course can be uploaded to any server in the school, and the video live broadcast or on-demand broadcast on the campus network or the internet can be synchronized to achieve the function of remote interactive teaching and campus class communication.

4. Network TV Collection Capture high-definition or standard-definition video source via HD VGA/DVI/HDMI streaming capture card, and record it in video application software to your desired format (MPEG-1/2/4*&H.264) output. Or by supporting third-party software based on the Microsoft Directshow framework, real-time recording into a variety of streaming media formats, uploaded to the Internet, to provide a variety of high-definition IPTV program source.

5. Network Video Conference and Training Nowadays video conference is developing vigorously, which has higher requirements for the video conference video quality. Because the video capture card function is more diversified than the USB camera, more and more enterprise users are beginning to Use a video capture card. High-definition streaming media capture card can collect high-definition DVI/HDMI/VGA signals, without restriction on the video source device, and also increase the color difference component and composite video input, and can capture 1080P high-definition source. Through analog cameras. High-definition VGA/DVI/HDMI streaming capture card can receive high-definition or standard-definition video signals from the video input, through the support of Microsoft Directshow architecture third-party software, real-time recording into the audio and video formats you need. Realize remote "zero distance" communication.

6. The vigorous development and popularization of webcast on demand internet has higher requirements on the image quality of video. Because video capture cards are more versatile than USB cameras, more and more live webcast users are starting to Use a high-definition video capture card.

7. High-Definition Medical Video Image Acquisition With the popularity of HD in the medical industry, many system vendors will consider acquiring high-definition solutions. HD VGA/DVI/HDMI streaming media capture cards with medical cameras record real-time recording of high-definition medical images through support. The third-party software and powerful SDK secondary development package based on Microsoft Directshow can be compatible with any medical device software, capture high-quality images, with de-interlace function, effectively remove image ripples and flicker to make the picture clearer, text and time Overlay setting function, convenient to record the situation and date of each acquisition.

8, large-screen splicing, edge fusion large-screen splicing, multi-channel large-screen splicing solutions With the popularity of multimedia screens in various industries, many system providers will consider the acquisition of high-definition solutions, high-definition VGA / DVI / HDMI streaming media Capture card with large-screen splicing and recording real-time recording of high-definition images, support for third-party software and powerful SDK secondary development package based on Microsoft Directshow, compatible with any device software, capture high-quality images, with de-interlace function, effective Remove image ripples and flicker to make the picture more clear, text and time superposition setting function, convenient to record the situation and date of each acquisition.

9, intelligent traffic, security monitoring system for intelligent traffic, security monitoring system for people, vehicles, etc. collected or with specialized intelligent software for flow analysis and security monitoring.