Subpixel location of circle target center based on geometric features

WANG Lin-bo; WANG Yan-jie; DI Nan; JIN Ming-he

doi:10.3788/YJYXS20142906.1003

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Subpixel location of circle target center based on geometric features

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- Subpixel location of circle target center based on geometric features
- Chinese Journal of Liquid Crystals and Displays Vol. 29, Issue 6, Pages: 1003-1009(2014)
- 作者机构：
  
  1. 中国科学院长春光学精密机械与物理研究所, 吉林长春 130033
  2. 中国科学院大学, 北京 100049
  3. 哈尔滨工业大学机器人技术与系统国家重点实验室, 黑龙江哈尔滨 150001
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20142906.1003
  CLC： TP391.4
- Received：03 March 2014，
  
  Revised：24 March 2014，
  
  Published：05 December 2014
- 稿件说明：
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王林波, 王延杰, 邸男, 金明河. 基于几何特征的圆形标志点亚像素中心定位[J]. 液晶与显示, 2014,29(6): 1003-1009

WANG Lin-bo, WANG Yan-jie, DI Nan, JIN Ming-he. Subpixel location of circle target center based on geometric features[J]. , 2014,29(6): 1003-1009
王林波, 王延杰, 邸男, 金明河. 基于几何特征的圆形标志点亚像素中心定位[J]. 液晶与显示, 2014,29(6): 1003-1009 DOI： 10.3788/YJYXS20142906.1003.

WANG Lin-bo, WANG Yan-jie, DI Nan, JIN Ming-he. Subpixel location of circle target center based on geometric features[J]. , 2014,29(6): 1003-1009 DOI： 10.3788/YJYXS20142906.1003.

摘要

视觉测量系统中圆形标志点中心定位的精度易受噪声的影响。为了增强其抗噪性从而提高定位精度，提出了一种利用几何特征以降低噪声干扰的中心定位算法。首先将自适应阈值分割法与质心法相结合，对点目标进行圆心粗定位。利用粗定位的圆心和半径对Canny算子检测到的边缘进行半径约束，以消除孤立点和噪声点。然后根据理想的圆成像后边缘点分布的几何特征和链接规律，采用一种基于分区原理的方法获取点目标的理想边缘。最后，采用Zernike正交矩对像素级边缘点进行亚像素定位，并用最小二乘椭圆拟合法计算得到中心坐标。实验结果表明，该方法的定位精度可以达到0.023 7 pixel，算法的运行时间为2～3 ms，基本满足测量系统对于圆形标志点中心定位在精度、稳定性和实时性上的要求。

Abstract

The location accuracy of circle target center in vision measurement system is susceptible to the noise. In order to enhance the capacity of anti-interference of noise and improve the location accuracy

a modified subpixel location algorithm of circle target center based on geometric features is proposed in this paper. Firstly

coarse location of circle target center is realized by combining adaptive threshold segmentation and centroid method

which is used for radius constraint of the edge detected by Canny operator to remove the isolated points and the noisy points. Then

starting from the geometric distribution characteristics and linking discipline of the ideal imaging of circle

a method based on partition theory is brought forward to obtain ideal and continuous edge of circle target. Finally

Zernike moment is used to carry out the subpixel location of the edge

and the center location is achieved by the least-squares ellipse fitting method. The experiments results show that the location accuracy can reach to 0.023 7 pixels

and the operation time is between 2 and 3 ms. It can satisfy the high requirements of precision

stabilization and real-time ability of circle target center in the measurement system.

关键词

Keywords

references

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