Design Of Video Capturing System Based On PC104

With the concern about the development of marine resources, underwater robot becomes an important tool for marine development. This project comes from Harbin Engineering University, National Defense Key Laboratory of Underwater Robot Project. As a part of underwater robot's target recognition system, the video capture system is designed in this paper. The main controller of the video capture card designed with a PC104 interface is based on FPGA. The video capture card connecting to the host PC104 with Vxworks Operation System achieves an embedded video capture system.Followed the PC104 specification, the PC104 interface of the video capture card connecting by stacking retains the full function, ease of extensions. Ping-pong operation achieves the video cache by two SRAM. This design can not only meet the speed requirements of video capture, but also save design cost.In the control of SAA7113, the process of video capture is determined through determining the value of the SAV (start of active data) and EAV (end of active data) in data stream. This method can save I\O port resources.The veneer debugging of the capture card is completed in this paper. The video capture system which is composed of PC104 host with Vxworks Operation System and the video capture card with PC104 interface is established in this paper. Overall debugging of the system is also completed and the debugging results show that the communication between the PC104 host and the capture card can be carried out normally. The capture, display and save of the video and image also can be completed in the debugging process. So the design in this paper is feasible and achieves the desired results.