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In imaging system,FPGA is used as a main logic unit, and DSP control to realize the data acquisition for black-white video signal.The principal of imaging system is introduced. Three parts is expounded in details, such as construction of acquisition part, control logic of FPGA, DSP control and Interrupt respond. Using FPGA to realize video signal collection will enhance the system capability, and easy to design and debug. It also has such advantages as adaptability and flexibility. Clear image is obtained from experiments using this imaging system.