We describe an alternative stereo calibration method for stereo-digital image correlation (stereo-DIC) using computer-simulated speckle-pattern calibration targets and a DIC-based control points matching technique. The present work refines and extends the recently proposed camera calibration method to stereo calibration, which is an essential part of stereo-DIC measurement. In the proposed calibration method, the calibration target is generated by displaying a synthetic speckle pattern on a commercial tablet. On the simulated speckle pattern, a group of control points is specified with flexible location and number, which is further precisely matched to the captured calibration images using the well-developed subset-based DIC algorithm. These precisely matched control points are subsequently used to calibrate the intrinsic and extrinsic parameters of the stereo-DIC system with stereo calibration algorithm. For better accuracy, the error in the manufacture of the calibration targe...

中文翻译：

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使用合成散斑图案校准目标校准立体数字图像相关系统

我们描述了使用计算机模拟的散斑图案校准目标和基于DIC的控制点匹配技术的立体声数字图像相关（stereo-DIC）的替代立体声校准方法。本工作将最近提出的摄像机校准方法改进并扩展到了立体声校准，这是立体声DIC测量的重要组成部分。在提出的校准方法中，通过在商用平板电脑上显示合成斑点图案来生成校准目标。在模拟的斑点图案上，指定了一组控制点，它们具有灵活的位置和数量，并使用完善的基于子集的DIC算法将其与捕获的校准图像进一步精确匹配。这些精确匹配的控制点随后用于通过立体声校准算法校准立体声DIC系统的内部和外部参数。为了获得更高的精度，校准靶的制造过程中存在误差。