介绍了运用在系统可编程逻辑器件和微控制器, 并充分发挥芯片各自的优点, 以低成本构成的检测图像水平直线边缘的视频信号处理系统。该系统与步进电机控制系统组成一闭环回路, 从而实现自动定位功能。生产实践表明, 本系统有较高的精度和可靠性。 关键词: 自动定位, 视频信号, 可编程逻辑器件 【Abstract】 In th is paper, a so rt of low 2co st video signal p rocessing system in tegrated w ith in system p rogramm ab le device and m icro2con t ro ller w as in t roduced, w h ich can detect ho rizon tal line edge. To imp lem en t au to2locat ion funct ion, a stepper mo to r con t ro l system w as added to con st ruct a clo sed2loop system. The resu lt of p ract ice show ed that the system has h igh accu racy and reliab ility. Keywords: autoloca tion, v ideo s igna l, PLD