说明：  路径跟踪是机器人视觉导航控制基本技术之一，为使机器人沿地面彩色引导线自主运动，并能在适时离线执行任务 后自动返航，提出了一种用可编程逻辑器件(CPLD)实现的视觉伺服PID 控制方法。该方法利用图像特征反馈对其所跟踪的 路经进行实时识别跟踪。仿真结果表明，该方法改善了控制算法的实时性，提高了移动机器人的路径跟踪精度与速度。
(Path tracking control of robot visual navigation, one of the basic technology, in order to guide the robot along the ground color line autonomous movement, and offline in a timely manner after the implementation of auto-return mission, a programmable logic device to use (CPLD) realize the visual servoing PID control methods. By using image feature tracking their feedback via real-time identification and tracking. The simulation results show that the method improves the real-time control algorithms, and enhance the mobile robot path tracking accuracy and speed.)