光波导器件边缘的高精度直线检测  

High-precision line detection of optical waveguide devices edge

作　　者：吕文[1] 郑煜[1] 王丽军[1] 李继攀 段吉安[1] 

机构地区：[1]中南大学高性能复杂制造国家重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2017年第7期1734-1740,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51475479);国家高新技术研究发展计划(863计划)项目(2012AA040406);湖南省自然科学基金资助项目(14JJ2010);流体动力与机电系统国家重点实验室开放基金资助项目(ZKF-201401)~~

摘　　要：为了在光波导器件对准中快速、准确地检测波导边缘直线,保证检测精度,提出一种高精度快速边缘直线检测方法。其步骤为:分析光波导器件对准的机器视觉系统及其精度要求;通过对耦合界面灰度分布的一阶导数进行拟合求峰值位置提取亚像素边缘点;基于RANSAC算法和OLS算法相结合的方法对提取的边缘进行高精度直线拟合,并以此计算波导的位姿参数。研究结果表明:本算法检测角度误差小于0.003?,距离误差小于0.1像素,运算时间小于0.5 s,能精确拟合带有破损、脏污等噪声因素的波导边缘,实现光波导器件边缘的高精度直线检测。In order to detect the waveguide edges accurately and quickly in the alignment of optical waveguide devices and ensure the detection precision, a high-precision fast line detection method was proposed. The procedures were as follows. Firstly, the machine vision system and accuracy requirement of waveguide devices alignment were analyzed. Secondly, the subpixel edge points were extracted through fitting the first derivative of gray value distribution of coupling interface and solving the peak value. Lastly, the fitting method based on the RANSAC and OLS algorithm was applied in the extracted pixels to obtain the fitting lines, and the waveguide posture parameters were computed subsequently. The results show that the detection angle error is less than 0.003？, the distance error is less than 0.1 pixel and the time consumption is less than 0.5 s using the proposed method. Besides, it can accurately fit waveguide edge with some noises such as the damage and smudginess, and therefore, it can realize the high-precision line detection of optical waveguide devices edge.

关 键 词：直线检测 光波导器件 亚像素边缘 RANSAC算法 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]