J4 ›› 2012, Vol. 29 ›› Issue (1): 58-62.

• 激光技术与器件 • 上一篇    下一篇

激光光斑中心位置的亚像素定位技术研究

李强   

  1. 连云港师范高等专科学校物理系,江苏 连云港 222006
  • 收稿日期:2011-04-20 修回日期:2011-06-20 出版日期:2012-01-28 发布日期:2012-01-28
  • 通讯作者: 李强(1975-),江苏人,研究生,主要从事光电应用等方面的研究。 E-mail:liqiang9677@126.com

Center-determination of laser spot based on sub-pixel positioning technology

LI Qiang   

  1. Department of Physics, Lianyungang Teachers College, Lianyungang  222006, China
  • Received:2011-04-20 Revised:2011-06-20 Published:2012-01-28 Online:2012-01-28

摘要:

激光光斑中心位置的确定是墩顶位移测量系统中进行位移量计算的关键与核心,能否准确定位光斑中心直接关系到计算的准确程度。利用MATLAB对由墩顶位移测量系统采集到的激光光斑图像采用噪声消除和中值滤波进行图像平滑处理,提高目标与背景的区分度,为提取目标创造条件。其次,利用Canny算子对图像进行分割,以便从复杂背景中提取目标图像。最后,根据所提取的目标利用亚像素细分算法中的灰度重心算法求出激光光斑的中心坐标,为实现墩顶位移的精密测量提供了关键数据。

关键词: 激光技术, 光斑中心, 图像平滑, 目标提取, 灰度重心

Abstract:

Center-determination of laser spot is the key technology of crown placement measurement system because it immediately concerns accuracy of the displacement. First in this paper, by using Matlab software system, the grabbed laser spot image was smoothed with noise cancellation and median filtering to improve separating capacity of the targets and the background, which would set the terms for the object extraction. Then the image was segmented with Canny operator to extract target image from cluttered background. Finally, based on the extracted target, center coordinates of the laser spot could be found by using gray barycenter algorithm.

Key words: laser techniques, spot center, image smoothing, object extraction, gray barycenter

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