
第 43 卷 第 2 期
2016 年 2 月
Vol. 43, No. 2
February, 2016
中 国 激 光
CHINESE JOURNAL OF LASERS
0208001-
激光散斑三维形貌绝对测量技术
赵明路
1
马 骁
1
张子邦
1
梁 曼
1
李 莹
2,3
钟金钢
1,2
*
1
暨南大学光电工程系, 广东 广州 510632
2
暨南大学光电信息与传感技术广东普通高校重点实验室, 广东 广州 510632
3
暨南大学华文学院, 广东 广州 510610
摘要 为了实现对物体的三维形貌绝对测量,避免相位解包裹处理,研究实现了一种基于激光散斑场纵向相关性质的
三维形貌绝对测量技术。实验研究了激光散斑场纵向相关性质,利用 CCD 相机拍摄不同纵向深度的散斑图,通过相
关运算获得散斑图的纵向深度与横向偏移之间的线性关系。利用这一线性关系,实现了对处于激光散斑场中的物体
表面到参考面之间高度的绝对测量,三维形貌重建无需相位解包裹处理,并且由于激光散斑场是激光照射毛玻璃形
成的,避免了投影数字散斑技术中的透镜投影系统,技术装置简单,操作方便。该技术有望在实践中获得应用。
关键词 测量; 高度测量; 图像相关; 激光散斑
中图分类号 O439 文献标识码 A
doi: 10.3788/CJL201643.0208001
Three-Dimensional Shape Absolute Measurement Based
on Laser Speckles
Zhao Minglu
1
Ma Xiao
1
Zhang Zibang
1
Liang Man
1
Li Ying
2,3
Zhong Jingang
1,2
1
Department of Optoelectronic Engineering, Jinan University, Guangzhou, Guangdong 510632, China
2
Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes,
Jinan University, Guangzhou, Guangdong 510632, China
3
College of Chinese Language and Culture, Jinan University, Guangzhou, Guangdong 510610, China
Abstract The longitudinal coherence properties of laser speckles are investigated. The properties are then utilized
for three-dimensional (3-D) shape absolute measurement, bringing a feature that phase unwrapping is released.
A sequence of speckle images is captured by a CCD camera at different longitudinal positions. The lateral
displacement of the speckle can be obtained by calculating the correlation among the speckle images. According
to the relationship between the longitudinal length and the lateral displacement, the absolute measurement of height
from the object surface to reference plane can be realized. Additionally, the phase unwrapping process is released
in data processing. A projection-lens system in the technique of projected digital speckle patterns is also released,
because the laser speckle field is generated by a laser which illuminates on a frosted glass. The structure of the
system is simple and convenient for implement. This technique is potential to be used in practice.
Key words measurement; height measurement; image correlation; laser speckle
OCIS codes 120.2830; 100.2000; 030.6140
1 引 言
结构光投影三维形貌测 量术,已广泛应用于 三维模 型重建、物体表面轮廓测量等领 域
[1-6]
。在目前现有
的结构光投影三维形貌测量技术中,利用条纹图投影的相位检测三维形貌测量技术,具有测量速度快、精度
收稿日期: 2015-08-12; 收到修改稿日期: 2015-10-08
基金项目: 国家自然科学基金(61475064、41206081)、广东省科技计划项目(2013B060100001)
作者简介: 赵明路(1988—),男,硕士研究生,主要从事光学检测方面的研究。E-mail: milozhao@live.cn
导师简介: 李 莹(1976—),女,博士,副教授,主要从事光学检测等方面的研究。E-mail: liying@hwy.jnu.edu.cn
*通信联系人。E-mail: tzjg@jnu.edu.cn
1