计算机应用 ›› 2015, Vol. 35 ›› Issue (5): 1430-1434.DOI: 10.11772/j.issn.1001-9081.2015.05.1430

• 虚拟现实与数字媒体 • 上一篇    下一篇

融合多层平截的数字散斑图像整像素极值位移法

张彩宏, 潘广贞, 杨剑, 刘婷   

  1. 中北大学 计算机与控制工程学院, 太原 030051
  • 收稿日期:2014-12-19 修回日期:2015-01-23 出版日期:2015-05-10 发布日期:2015-05-14
  • 通讯作者: 张彩宏
  • 作者简介:张彩宏(1990-),女,山西忻州人,硕士研究生,主要研究方向:图形图像处理、计算机仿真; 潘广贞(1969-),男,山东泰安人,教授,博士,主要研究方向:图形图像处理、计算机仿真; 杨剑(1979-),男,山西临汾人,博士,主要研究方向:计算机仿真、机器视觉; 刘婷(1991-),女,山西运城人,硕士研究生,主要研究方向:图形图像处理、三维光学信息处理.
  • 基金资助:

    总装备部预研基金资助项目.

Extremum displacement measurement for laser speckle images with multi-level crossing

ZHANG Caihong, PAN Guangzhen, YANG Jian, LIU Ting   

  1. School of Computer and Control Engineering, North University of China, Taiyuan Shanxi 030051, China
  • Received:2014-12-19 Revised:2015-01-23 Online:2015-05-10 Published:2015-05-14

摘要:

针对数字散斑图像的极值位移测量法存在的极值点对误匹配问题,提出一种改进的整像素极值位移法.首先通过极值法查找移动前后散斑图的极值点,构造极值矩阵,生成三维显示图; 然后利用多个指定灰度平面平截三维显示图,得到平截点;最后分析平截点构成的相对位移矩阵,计算物体位移.在无噪声和有噪声的条件下进行仿真实验,实验结果都证明,改进算法在保证位移测量精度准确的条件下,极值点对误匹配数减少,运算效率提高103倍.将该算法应用到激光鼠标定位中,移动位移分辨力可达1μm,移动方向的角度误差不超过2.72°.结论证明,融合多层平截的激光散斑图像极值位移法是一种快速、高效、实用的改进算法.

关键词: 数字散斑图像, 极值位移测量法, 多层平截, 极值点, 平截点

Abstract:

Aiming at the problem of mismatching of the extreme points in extremum method for digital speckle images, a new algorithm named the whole pixel extremum displacement measurement for laser speckle images with multi-level crossing was proposed. The extremum method was used to figure out the extreme points of speckle images before and after displacement, constructed extremum value matrix and generated 3-D figure. Then the truncation points were got by multiple specified gray planes crossing 3-D figure. And relative displacement matrix of truncation points was analyzed to calculate displacement of object. The simulation results under the condition of no noise and noise prove that the improved algorithm under guaranteeing the accuracy of displacement measurement, decreases the number of extreme points of error matching and improves operation efficiency 103 times. The algorithm was applied to the laser mouse positioning and the experimental results show that the displacement of the mobile resolution reached 1 microns, and moving direction angle error was less than 2.72°. It is conclued proves that multi-level truncation extremum displacement method based on laser speckle image is a rapid, efficient and practical algorithm.

Key words: digital speckle image, Extremum Displacement Measurement (EDM), multi-level crossing, extreme point, truncation point

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