The Study Of Image Acquisition And Storage System Based On USB Interface And FPGA

The acquisition and processing of image signal are used widely in the fields of scientific research, industrial and agricultural production, medicine and sanitation, public security and so on. And these works can't be completed without a set of high-speed image acquisition system. Meanwhile image acquisition is the basis of image processing, compressing and recognizing, so the research on image acquisition system is very important and valuable. In order to acquire image, a kind of high-speed computer interface supporting long time and high throughput data transferring is needed. USB 2.0 interface is a computer interface that meets the need of image acquisition. In addition, USB interface has the advantages of high transfer-rate, hot plug and play, less resource requirement, being easily extended and used. At present, many peripheral devices of computer use USB interface to accomplish data communication with computers.The research of "The study of Image Acquisition and storage System Based on USB Interface and FPGA" is to design a high-speed image acquisition, card acquiring and processing image data, and then transferring the data to computer by USB2.0 interface, to display and store the data on computer. The hardware circuit of the system was designed and PCB board was produced. The software of the card was developed too. The image acquisition card contains the following five parts: CMOS image sensor circuit, FPGA control circuit, SRAM storage, digital signal processor and data transferring part based on USB 2.0interface.For the hardware circuit design, the conceptual scheme of image data acquisition system was proposed, and then the principle of image acquisition card was demonstrated. Lastly, it's expatiated that the main chips used in the acquisition system, the main modules of hardware circuit, the FPGA logic design and the PCB design etc.For the software design, the development of FIFO program in the acquisition system was introduced. At the same time, the design scheme of CY7C68013's firmware was given. And the firmware was developed. It is discussed based on firmware design that the design method, developing structure, main program, initial function, and endpoint configure and GPIF design of CY7C68013 firmware program. WDM driver is the software interface to access and control hardware, and application provides users with interface and the USB data transferring result. So the development of WDM driver and the application of the acquisition system were introduced. Lastly, the data transferring results between the application and FIFO by USB interface were demonstrated.