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参考特征自动选取的3-D DIC相机自运动补偿的研究

3D-DIC camera self-motion compensation based on automatic selection of reference features

  • 摘要: 由于背景中存在运动特征干扰,传统的运动补偿方法因参考特征点的不恰当选择而导致补偿效果不佳。为了提高数字图像相关技术(DIC)在相机自运动干扰下的位移测量精度,采用了基于参考特征自动选取与深度信息约束的相机自运动补偿方法。本文中方法首先通过对时序差分图像进行网格化分割,实现场景静止区域与运动干扰区域的鲁棒分离;然后在静止区域内筛选特征点,剔除显著运动的特征点;最后结合特征点的深度信息,进一步优化用于估计相机自运动模型的特征点集,从而提高相机自运动补偿的准确性和鲁棒性。结果表明,和不筛选特征点的相机自运动补偿方法相比,本文中方法在相机自运动补偿后的位移测量均方根误差降低了73.5%,能更好地抑制相机自运动对DIC测量精度的干扰。该研究对3-D DIC技术在复杂环境下的应用是有帮助的。

     

    Abstract: To improve the displacement measurement accuracy of digital image correlation (DIC) affected by camera self-motion, a compensation method incorporating automatic selection of reference features and depth information constraints was proposed. Traditional motion compensation methods suffer from poor performance due to the improper selection of reference feature points when background motion interference exists. In the proposed method, robust separation between stationary and moving interference regions in the scene was first achieved by performing grid segmentation on temporal difference images. Then, feature points were screened within the stationary region, and those with significant motion were eliminated. Finally, by combining the depth information of the feature points, the set used to estimate the camera self-motion model was further optimized, improving the accuracy and robustness of the camera self-motion compensation. The results showed that compared with the camera self-motion compensation method without screening feature points, the proposed method reduced the root-mean-square error (RMSE) of displacement measurement by 73.5% after camera self-motion compensation. The proposed method better suppressed the interference of camera self-motion on DIC measurement accuracy. These findings contribute to the application of 3-D DIC technology in complex environments.

     

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