A frame grabber is a hardware device used to convert ana-log video signals into digital signals and transmit them to a computer for processing and storage.
The basic principle of the image capture card is to convert ana-log video signals into digital signals, and then transmit the digital signals to the computer for processing and storage. It usually consists of three parts: input interface, digital converter and output interface.
The input interface is responsible for receiving ana-log video signals. Common input interfaces include BNC, HDMI, DVI, SDI, etc. Digital converters convert ana-log video signals into digital signals. Common digital converters include ADC (ana-log-to-digital converter) and DAC (digital-to-ana-log converter). The output interface transmits digital signals to the computer for processing and storage. Common output interfaces include PCI, PCIe, USB, etc.
Image acquisition cards are widely used in surveillance, video conferencing, medical imaging and other fields. In the field of surveillance, image capture cards can convert ana-log video signals from surveillance cameras into digital signals, and then transmit them to the surveillance center for real-time monitoring and recording. In the field of video conferencing, the frame grabber can convert the ana-log video signal of the camera in the conference room into a digital signal, and then transmit it to the computer for video conferencing. In the field of medical images, image acquisition cards can convert ana-log video signals of medical equipment into digital signals, and then transmit them to computers for medical image processing and analysis.