| 王云舒,陈巨兵,孙晨*.大视场双目投影条纹方法中的相机参数标定与优化研究[J].实验力学,2021,36(2):175~184 |
| 大视场双目投影条纹方法中的相机参数标定与优化研究 |
| Study on optimization of calibration parameters in large field binocular fringe projection profilometry |
| 投稿时间：2020-11-23 修订日期：2020-12-21 |
| DOI：10.7520/1001-4888-20-230 |
| 中文关键词: 投影条纹法 相机标定 相机参数优化 大面积三维重建 |
| 英文关键词:fringe projection profilometry camera calibration camera parameter optimization large surface 3D reconstruction |
| 基金项目:国家自然科学基金(11732009， 11902196)；上海交通大学“科技创新专项资金”项目(19X160020015)资助 |
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| 中文摘要: |
| 投影条纹法具有高精度、高分辨的特点，且实验设备简单，对实验环境要求低，适宜于不同尺度的三维形貌测量。双目投影条纹法通常采用有标准参照物的相机标定方法获取相机参数，以实现物体表面三维形貌重建。然而，在大型结构的三维形貌测量中参照物的相对尺度较小，传统的基于重投影的相机标定方法在特征检测中引入的误差会被放大，从而影响三维表面形貌测量的稳定性和准确性。本文结合双目投影条纹成像原理，提出了一种适用于大面积形貌测量的投影条纹系统标定方法。该方法利用投影条纹控制点以及对极几何约束对张氏标定法结果进行优化，从而可以在大视场标定中保持较高的精度。实验表明，在标定板与测量物大小相当时，本文提出的标定方法与传统标定方法的测量结果基本一致；当标定板远小于待测物时，本文方法的测量精度和稳定性明显优于传统方法。 |
| 英文摘要: |
| Fringe projection profilometry(FPP) has wide application and a good prospect in multi-scale measurements topography measurement with its high resolution, high precision and high sampling efficiency, in addition to few requirements for environment and measurement devices. A standard reference object is adopted in camera calibration to acquire the camera parameters and then reconstruct the three-dimensional morphology. However, in large-area surface 3D topography measurement, when the relative scale of the reference object is small, the error introduced by corner detection in the traditional camera parameter optimization method using bundle adjustment will be magnified, thereby affecting the stability and accuracy of the 3D surface topography measurement. Based on the principle of binocular projection fringe system, this paper proposes a camera parameter optimization method suitable for large-area topography measurement. In order to maintain high accuracy of camera calibration in large field, this method selects fringe control points and uses epipolar constraints to optimize the calibration parameters obtained by Zhang's calibration method. Experiments show that, compared to the traditional camera calibration method, when the calibration object is of equal scale compared to the surface under measurement, the calibration method proposed in this paper bears little difference to the traditional calibration method, while in a scene where the calibration object is relatively small in scale, the proposed method helps to improve the stability and accuracy of the measurement result. |
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