首页|基于椭圆拟合法的湍流扰动光斑质心提取

基于椭圆拟合法的湍流扰动光斑质心提取

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由于现有椭圆拟合法在大气湍流扰动下提取光斑质心时存在抗干扰能力差、提取精度差等问题,激光通信系统伺服跟踪精度难以提升.为此,提出一种基于椭圆拟合的光斑质心快速提取方法.首先,根据湍流程度,使用遗传算法优化可变阈值分割并将其与形态学处理、边缘检测等操作结合提取光斑边缘.然后,将边缘特征点构成的集合分成不同大小的子集并将不同子集的散布矩阵叠加得到整个集合的散布矩阵.最后,采用直接最小二乘法求出拟合的椭圆参数,完成光斑质心提取.实验结果表明,在强湍流、掩模半径为120 pixel时,该方法的掩模内平均灰度强度比椭圆拟合法提高1.32 pixel,水平质心偏移降低4.59 pixel.该方法在不同程度的湍流扰动下可有效地实现光斑质心提取,在光斑破碎时依然可以保持高精度,可为空间激光通信的捕获、指向、跟踪系统的光斑质心提取提供技术支持.
Extraction of Laser Spot Centroid of Turbulent Disturbance Based on Ellipse Fitting Method
Because the existing ellipse fitting methods have problems such as poor anti-interference ability and poor extraction accuracy when extracting the spot centroid under atmospheric turbulence disturbance,it is difficult to improve the servo tracking accuracy of the laser communication system.To this end,this paper proposes a fast spot centroid extraction method based on ellipse fitting.First,according to the degree of turbulence,a genetic algorithm is used to optimize the variable threshold segmentation and combine it with morphological processing,edge detection and other operations to extract the spot edges.Then,the set of edge feature points is divided into subsets of different sizes and the scatter matrices of different subsets are superimposed to obtain the scatter matrix of the entire set.Finally,the direct least squares method is used to calculate the fitting ellipse parameters and complete the spot centroid extraction.Experimental results show that when there is strong turbulence and the mask radius is 120 pixel,the mean gray intensity within the mask of this method is 1.32 pixel higher than that of the ellipse fitting method,and the horizontal center of mass offset is reduced by 4.59 pixel.This method can effectively achieve spot centroid extraction under varying degrees of turbulence disturbance,and can still maintain high accuracy when the spot is broken,providing technical support for spot centroid extraction in capture,pointing,and tracking systems for space laser communications.

atmospheric turbulencecentroid extractionellipse fittinggenetic algorithmlaser spot fragmentation

王建兵、姚海峰、刘智、董科研、刘树通

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长春理工大学电子信息工程学院,吉林 长春 130022

北京理工大学光电学院,北京 100081

长春理工大学空间光电技术国家地方联合工程研究中心,吉林 长春 130022

大气湍流 质心提取 椭圆拟合 遗传算法 光斑破碎

国家自然科学基金叶企孙科学基金国家自然科学青年科学基金中国博士后科学基金中国博士后科学基金应用光学国家重点实验室基金

U2141231621050292021TQ00352021M700415SKLA02022001A11

2024

10.3788/LOP231987

激光与光电子学进展
中国科学院上海光学精密机械研究所

激光与光电子学进展

CSTPCD北大核心
影响因子：1.153
ISSN：1006-4125
年,卷(期)：2024.61(13)