Tag: Video Capture Monitoring Card
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The monitoring card is also called a video capture card, a video compression card, and a video card, and is generally referred to as a monitoring card. The monitoring card is inserted into the PCI interface of the PC computer. The video surveillance image is captured by software, compressed in a certain format and saved on the hard disk of the PC. Generally, the compression format is MJPEG, MPEG-1, MPEG2, MPEG4, H. 264, MV9, etc. The latest compression formats are H.264 and MV9.
The main functions and technical indicators of the video surveillance card with PC as the hardware environment:
I. Interface: The interface of the video capture card includes the interface between the video and the PC and the interface with the analog video device. At present, the PC video capture card usually adopts a 32-bit PCI bus interface, which is inserted into the expansion slot of the PC motherboard to realize communication and data transmission between the capture card and the PC. The capture card must have at least one composite video interface (VideoIn) for connection to an analog video device. High-performance capture cards typically have a composite video interface and an S-Video interface. The general acquisition card supports both PAL and NTSC TV formats.
It should be noted that the video capture card generally does not have a TV antenna interface and an audio input interface. The video capture card cannot directly collect the TV RF signal, and the audio signal in the analog video cannot be directly collected. To collect sound, a sound card must be installed on the PC. The video capture card obtains the digital sound through the sound card on the PC and synchronizes the sound with the captured digital video.
Second, the function: on the PC through the video capture card can receive the analog video signal from the video input, the signal is collected, quantized into a digital signal, and then compressed into a digital video sequence. Most video capture cards have a hardware compression function. When acquiring a video signal, 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 PC video capture card uses the intra-frame compression algorithm to store the digitized video into an AVI file. The high-end video capture card can also directly compress the collected digital video data into an MPEG-1 format file.
The monitoring image transmits the data to the monitoring card without interruption and real-time through the analog form of the current signal. The monitoring card collects each frame of the analog signal and stores it in the computer memory through the software. Therefore, the key to real-time acquisition is the processing time required for each frame. If the processing time of each frame of video image exceeds the interval between adjacent frames, data loss, that is, frame dropping phenomenon occurs. The capture card compresses the acquired video sequence and then stores it in the hard disk.
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