Global calibration of line-structured-light measurement system using multi-CCD based on an LCD target

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Global calibration of line-structured-light measurement system using multi-CCD based on an LCD target

Article | 更新时间：2020-08-13

- Global calibration of line-structured-light measurement system using multi-CCD based on an LCD target
- Optics and Precision Engineering Vol. 17, Issue 12, Pages: 2990-2996(2009)
- 作者机构：
  
  清华大学精密仪器与机械学系
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：31 December 2008，
  
  Revised：24 March 2009，
  
  Published Online：25 December 2009，
  
  Published：25 December 2009
- 稿件说明：
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贾倩倩,王伯雄,赵博华,罗秀芝. 基于液晶靶标的多CCD线结构光测量系统全局标定[J]. 光学精密工程, 2009,17(12):2990-2996

Global calibration of line-structured-light measurement system using multi-CCD based on an LCD target[J]. Optics and precision engineering, 2009, 17(12): 2990-2996.
贾倩倩,王伯雄,赵博华,罗秀芝. 基于液晶靶标的多CCD线结构光测量系统全局标定[J]. 光学精密工程, 2009,17(12):2990-2996 DOI：

Global calibration of line-structured-light measurement system using multi-CCD based on an LCD target[J]. Optics and precision engineering, 2009, 17(12): 2990-2996. DOI：

摘要

为了在多CCD线结构光测量系统中进行精确快速的全局标定，研究了一种基于液晶平面靶标的多CCD全局标定方法。首先，将液晶靶标放入光平面中，在靶标上显示一系列特征点，各个CCD同步采集。然后

通过时间序列对应特征点的图像坐标与靶标坐标，建立起像平面与靶标平面间的非线性模型。最后，对形位关系已知的标准块进行测量，利用标准块的形位关系对像平面与靶标平面间的非线性模型进行优化，得到像平面与光平面间的映射关系，完成多CCD的全局标定。利用优化后的标定结果进行测量，在自由曲面类物体的测量中三个摄像机的数据拼接精度高，对标准块上特征点距离测量的绝对误差为0.2mm，角度测量的绝对误差为0.2°。方法快速简便，适合现场操作，已在多CCD线结构光测量系统中得到了实际应用。

Abstract

In order to realize the global calibration in line-structured-light measurement system using multiple CCDs

an approach to calibrate multiple CCDs based on an LCD target is investigated. First

a LCD target is arranged at the position of light section

and characteristic points are shown on the target one by one

which are captured by cameras at the same time. Then the relationship between the target coordinate and the image coordinate is established in a non-linear model through synchronizing pulses. Finally

the model is optimized by the shape restraints of a calibrating part to get the mapping between the light sectioning plane and the image plane. Measurements of free surface show that the data from different CCDs are well spliced in the light sectioning plane

and measurements of the calibrating part are accurate with an error less than 0.2mm in distance and 0.2°in angle. This method is easy to use

and has been successfully applied in a multi-CCD 3D measurement system.

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