基于片光模型的三维标定方法研究

Research on 3D Calibration Method Based on Sheet of Light Model

三维标定参数精度对3D视觉测量的作用至关重要。为解决传统激光三角法标定原理复杂、过程繁琐以及在倾斜平面标定精度不稳定问题,提出一种基于片光模型的三维标定方法。采用曲面灰度值拟合算法,结合标准量块几何尺寸与视差图像中的深度信息映射关系生成标定系数,解决激光三角检测系统在不完全水平基准面标定精度不稳定问题。利用经验值加标定矫正方式保证标定精度。实验结果表明,该标定方法能准确测量物体高度,Z轴平均绝对测量误差为0.0018mm,倾斜平面标定精度较高,能满足高精度测量需求。

The accuracy of 3D calibration parameters plays a vital role in 3D visual measurement.In order to solve the problems of the traditional laser triangulation method,such as the complexity of calibration principle and process,and the instability of calibration accuracy in the tilted plane,a 3D calibration method based on the sheet of light model was proposed.The calibration coefficient is generated by using the algorithm of curved surface grayscale fitting and combining the geometric dimension of standard gauge block with the mapping relation of depth information in disparity image,which solves the problem that the calibration accuracy of the laser triangulation system is not stable in the incomplete horizontal datum plane.The method of empirical value combined with calibration correction can effectively ensure the calibration accuracy.The experimental results show that this calibration method can accurately measure the height of the object,the Z-axis average absolute measurement error is 0.0018mm,and the tilted plane calibration accuracy is high,which meets the requirements of high-precision measurement.