为了实现激光通信系统对信标光的捕获、跟踪与瞄准, 采用嵌入式图像处理技术设计了基于现场可编程门阵列器件的高速激光光斑检测系统, 对分辨率为300pixel×300pixel、帧频1000Hz序列图像中的激光光斑目标进行了提取操作。采用1维滤波算子构造方位滤波器进行图像预处理, 同时便于硬件实现, 滤波后经阈值分割、形态学开运算与连通域分析, 最后提取了激光光斑的形心位置信息。结果表明, 所设计系统能够对包含激光光斑目标的高帧频图像进行实时处理。目标形心提取频率可以满足激光通信系统在动态链路建立方面的要求。

In order to realize beacon acquisition, tracking and pointing(ATP) of laser communication, a high speed laser spot detection system was designed based on field-programmable gate array and embedded image processing technology. Laser spots of targets in the sequence images with 300pixel×300pixel resolution and 1000Hz frame rate were extracted. 1-D filtering operator position filter was used to process the images and the hardware was implemented at the same time. After filtering, threshold segmentation, morphological opening operation and connected region analysis, centroid position information of laser spot were extracted. The experimental results show that the system is capable of real-time processing of high-frame rate images containing targets’ laser spot. The extracting frequency of target centroid can meet the requirement of the dynamic link setup of laser communication.