基于视觉的折射误差校正在位移测量中的研究

Research on Correction of Refraction Error in Displacement Measurement Based on Vision

非常温环境中,保温装置的光学玻璃给摄影测量引入了玻璃折射误差。为了解决折射误差对位移测量精度影响,通过折射光路分析得到偏移误差模型,并结合曲面拟合法提出校正方法。实验表明,折射误差只与玻璃参数(折射率和厚度)和拍摄距离有关,且校正后的测量方法可以有效地改善玻璃折射影响,提高位移测量精度。

In abnormal temperature environments,the optical glass of the thermal insulation device introduces refraction errors into the photogrammetry.In order to solve the influence of refraction error on the accuracy of displacement measurement,the offset error model was obtained through the analysis of refraction optical path,and the correction method was proposed combining with the surface fitting method.The experimental results show that the refractive error is only related to the glass parameters(refractive index and thickness)and the shooting distance.The corrected measurement method can effectively tackle the refractive effect of glass and improve the accuracy of displacement measurement.