Improvement of depth calibration for digital projection 3D measurement system

ZHENG Peng; ZHANG Lin-na; WU Jian-quan; JIA Ying-feng

doi:10.3788/OPE.20152313.0239

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Improvement of depth calibration for digital projection 3D measurement system

更新时间：2020-08-13

- Improvement of depth calibration for digital projection 3D measurement system
- Optics and Precision Engineering Vol. 23, Issue 10z, Pages: 239-246(2015)
- 作者机构：
  
  郑州大学机械工程学院,河南郑州,450001
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20152313.0239
  CLC： TP306;TP391
- Received：08 June 2015，
  
  Revised：28 June 2015，
  
  Published：14 November 2015
- 稿件说明：
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郑鹏, 张琳娜, 吴建权等. 数字投影三维测量系统纵向标定的改进[J]. 光学精密工程, 2015,23(10z): 239-246

ZHENG Peng, ZHANG Lin-na, WU Jian-quan etc. Improvement of depth calibration for digital projection 3D measurement system[J]. Editorial Office of Optics and Precision Engineering, 2015,23(10z): 239-246
郑鹏, 张琳娜, 吴建权等. 数字投影三维测量系统纵向标定的改进[J]. 光学精密工程, 2015,23(10z): 239-246 DOI： 10.3788/OPE.20152313.0239.

ZHENG Peng, ZHANG Lin-na, WU Jian-quan etc. Improvement of depth calibration for digital projection 3D measurement system[J]. Editorial Office of Optics and Precision Engineering, 2015,23(10z): 239-246 DOI： 10.3788/OPE.20152313.0239.

摘要

基于投影测量原理及现有的标定技术提出了一种改进的纵向标定方法。分析了测量系统在任意几何设置下参考平面与成像面之间的坐标转换关系

构建了相位差-高度之间的映射数学模型

并给出具体的测量系统逆向标定操作过程。该标定几何模型放宽了对投影及摄像系统方位设置的限制条件

标定操作只需确定测量系统的数个待定参数

各参数与成像面上的像素点坐标值不相关

克服了原标定方法中对每个像素点进行繁琐的参数标定过程

从而有效减少了计算的复杂程度

降低了标定参数存储的空间。基于构建的数字投影光学三维测量系统

分别采用两种标定方法对系统进行了标定实验和实测对比

并分析了测量系统误差。结果表明:基于新标定方法测得的平板面形PV值小于原标定方法测得值

在

向0~48 mm

测得不同位置PV值的标准差为0.0036 mm

验证了改进方法的可行性。研究成果对于提高数字投影光学三维测量系统的标定效率和可操作性具有积极意义。

Abstract

On the basis of measuring principle and existing calibration technology

an improved depth calibration method was presented. After analysis of the coordinate transforming relation between reference plane and imaging plane of an ordinary geometry setting system

the mapping relation between the depth and the phase difference was established. Then

the reverse calibration process was given. The position restriction of a projection system and an imaging system was relaxed by the new calibration model. In the calibration process

calibration parameters were irrelevant to pixel coordinate values

so every pixel did not need its calibration parameters. Compared with the original method

the new method greatly reduces the calculative complexity and storage space of calibration parameters. Two calibration methods were used to calibrate the measurement system respectively. Then

a flat object was measured by different calibration systems

the results were compared and measuring errors were analyzed. The results show that the measured PV value of the object with the new method is smaller than that of the original method. In the

direction(0 to 48 mm)

the standard deviation of PV values is 0.0036 mm

which verifies the validity of the improved method. This research has positive significance on enhancing calibration efficiency and operability for digital projection measurement systems.

关键词

Keywords

references

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