图像采集卡主要完成对模拟视频信号的数字化过程。视频信号首先经低通滤波器

The frame grabber mainly completes the process of digitizing analog video signals. The video signal is first filtered by a low-pass filter and converted into a continuous analog signal in time; in accordance with the image resolution requirements of the application system, the sample / hold circuit must be used to sample the border video signal in time to convert The signal is converted into a discrete analog signal; then it is converted into a digital signal output by the A / D converter. While the image acquisition / processing card has analog-to-digital conversion functions, it also has video image analysis and processing functions, and can effectively control the camera at the same time.

图像采集卡主要完成对模拟视频信号的数字化过程。视频信号首先经低通滤波器滤波，转换为在时间上连续的模拟信号；按照应用系统对图像分辨率的要求，得用采样/保持电路对边疆的视频信号在时间上进行间隔采样，把视频信号转换为离散的模拟信号；然后再由A/D转换器转变为数字信号输出。而图像采集／处理卡在具有模数转换功能的同时，还具有对视频图像分析、处理功能，并同时可对相机进行有效的控制。

The image acquisition card mainly completes the digital process of analog video signal. Firstly, the video signal is filtered by low-pass filter and converted into the analog signal which is continuous in time; according to the requirements of the application system for image resolution, the sampling / holding circuit is used to sample the video signal in time interval in the border area, and then the video signal is converted into discrete analog signal; then the A / D converter is transformed into digital signal output. The image acquisition / processing card has not only the function of analog-to-digital conversion, but also the function of video image analysis and processing, and at the same time, it can effectively control the camera.<br>