By PURPLELEC | 07 August 2024 | 0 Comments
What technical parameters should be paid attention to when purchasing a video capture card?
The video capture card acts as a bridge between the camera and the computer, transmitting the collected information to the computer. What aspects should be paid attention to when purchasing a video capture card?
The technical parameters of the video capture card mainly include the following aspects:
(1) Video transmission format
The video capture card needs to support the output signal format used by the camera in the system. Most cameras use RS422 or EIA644 (LVDS) as the output signal format. In digital cameras, IEEE1394, USB2.0 and CameraLink are several video transmission forms that have been widely used.
(2) Video format (pixel format)
Black and white image: Under normal circumstances, the grayscale level of the image can be divided into 256 levels, that is, represented by 8 bits. When there is a more precise requirement for the grayscale of the image, it can be represented by 10 bits, 12 bits, etc.
Color image: Color image can be composed of RGB (YUV) three colors, and there are 8-8-8, 10-10-10 and other formats according to their brightness levels.
(3) Number of transmission channels
When the camera shoots high-resolution images at a high rate, it will generate a very high output rate, which generally requires multiple signals to be output simultaneously. Therefore, a good video capture card must be able to support multiple inputs.
Generally speaking, video capture cards are divided into 1-channel, 2-channel, 4-channel, 8-channel input, etc.
(4) Resolution
The maximum dot matrix supported by the video capture card reflects its resolution performance. Generally, video capture cards can support 768*576 dot matrix, while high-performance video capture cards, such as the M1202-2D 2K ultra-high-definition video capture card produced by Beijing Meifite, support a maximum dot matrix of up to 2048*2160, which greatly improves the image quality. In addition, the maximum number of dots per line and the maximum number of lines per frame can also reflect the resolution performance of the video capture card.
(5) Sampling frequency
The sampling frequency reflects the speed and ability of the video capture card to process images. When performing high-resolution video capture, it is necessary to pay attention to whether the sampling frequency of the video capture card meets the requirements. At present, the sampling frequency of high-end video capture cards can reach 60HZ.
(6) Transmission rate
Mainstream video capture cards and motherboards all use the PCI-E interface.
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