一种水下激光通信系统的光斑检测算法

Spot detection algorithm for underwater laser communication system

为了有效解决水下激光通信系统的激光光斑检测困难的问题,针对水质衰减系数约为5.5 dB/m、发射源与采集端相距5~10 m的低可视度复杂的水下环境,提出了一种简单实用的水下激光光斑检测算法。首先,通过图像去雾操作,增强图像中的目标光斑与背景的对比度;其次,经过高斯滤波,消除图像噪点;然后,选取合适阈值进行二值化,提取目标激光光斑;最后,通过改进的灰度重心算法计算光斑中心。实验结果表明:该算法不仅计算简单,且在低可视度高衰减的水质情况下能较准确地识别出目标激光光斑,并获取其中心坐标,使得水下激光通信系统能够根据光斑位置进行调整,实现正常通信。

In order to effectively solve the problem that is difficult to detect for laser spot in underwater laser communication system,a simple and practical underwater laser spot detection algorithm is proposed for the low visibility and complex underwater environment where the water attenuation coefficient is about 5.5 dB/m and the emitter is 5-10 m away from the acquisition end.Firstly,the algorithm enhances the contrast between the target spot and the background through the image defogging operation,after Gaussian filtering,the image noise is eliminated.Then the appropriate threshold is selected for binarization to extract the target laser spot.Finally,the spot center is calculated by the improved gray center of gravity algorithm.The experimental results show that the algorithm is not only simple in calculation,but also can accurately identify the target laser spot and obtain its central coordinates in the case of water quality with low visibility and high attenuation,so that the underwater laser communication system can adjust according to the spot position and realize normal communication.