This paper presents a FPGA based video interface conversion system that enables the inter-conversion between digital and analog video. Cyclone IV series EP4CE22F17C chip from Altera Corporation is used as the main video processing chip, and single-chip is used as the information interaction control unit between FPGA and PC. The system is able to encode/decode messages from the PC. Technologies including video decoding/encoding circuits, bus communication protocol, data stream de-interleaving and de-interlacing, color space conversion and the Camera Link timing generator module of FPGA are introduced. The system converts Composite Video Broadcast Signal (CVBS) from the CCD camera into Low Voltage Differential Signaling (LVDS), which will be collected by the video processing unit with Camera Link interface. The processed video signals will then be inputted to system output board and displayed on the monitor.The current experiment shows that it can achieve high-quality video conversion with minimum board size.
In order to establish measurement basis in non-cooperative environment, this paper proposes an autonomous
position and posture servo tracking method based on laser light guided monocular vision. The light of a linear laser
projected on a plane was simulated as horizon basis, while the laser light modulated by the projection in the reference
plane was taken as servo target. The modulated position and posture change information of laser light was obtained by
monocular vision system, information from which the attitude angle of the laser light could be calculated. The attitude
angle was transmitted to parallel tracking platform in real time and controlled the movement of the platform according to
the laser light. The tracking angle parameters of parallel tracking platform under different position and posture were
verified using an inclinometer, which proved the validity and effectiveness of this method. As to the existing
measurement errors, this paper analyzed possible causes and provided with feasible suggestions to further improve the
precision of the system.