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Capture principle of video capture card

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Author : PURPLELEC
Update time : 2023-11-10 10:45:45
  Video is a mixed media in which multiple still images (image frames) and continuous audio information move synchronously on the timeline. The multiple frames of images change over time to create a sense of movement, so video is also called a moving image. According to the different storage and processing methods of video, it can be divided into two types: ana-log video and digital video.
  Video acquisition is the process of converting the ana-log signals of the video source into digital signals (i.e. 0 and 1) through processing, and storing this digital information on the computer hard drive. This ana-log/digital conversion is performed through the capture chip on the video capture card.
  On the computer, the ana-log video signal from the video input terminal can be received through the video capture card, the signal is collected, quantized into a digital signal, and then compressed and encoded into digital video. Most video cards have the function of hardware compression. When collecting video signals, the video signals are first compressed on the card, and then the compressed video data is transmitted to the host through the PCI interface. General PC video capture cards use intra-frame compression algorithms to store digital videos into AVI files. Higher-end video capture cards can also directly compress the collected digital video data into MPEG-1 format files in real time.
Video capture card
  In terms of high-definition video capture and recording, VGA image capture card is a high-end product that has emerged due to the rapid development of the digital information industry and the increasing requirements for VGA signal collection in many fields. Whether it is in the application of machine vision systems in industrial industries or in teaching, it is widely used. It integrates many computer software and hardware technologies, and also involves many fields such as image processing and artificial intelligence. The video image capture card is an important part of the machine vision system. Its main function is to collect the video data output by the camera in real time and provide a high-speed interface with the PC.
  Video capture card is an indispensable hardware device for video processing and an indispensable hardware device for video digitization and digital video editing and post-production.
  Through the video capture card, we can transfer the video signals captured by the camera from the camera tape to the computer, and use relevant video editing software to perform post-editing processing on the digital video signals, such as cutting the picture, adding filters, Subtitles and sound effects, setting transition effects, adding various video special effects, etc., and finally converting the edited video signals into standard VCD, DVD, and online streaming media formats for easy dissemination and storage.