The measurement error of the finite-element-based Digital Image Correlation is reduced along the borders of an object by using the precise measurement, obtained by Virtual Image Correlation (VIC). The proposed method is called Virtual and Digital Image Correlation (VDIC). The boundary, identified by the VIC with a subpixel precision, is used firstly to create an adapted mesh and secondly to create a pixel mask. Futhermore, the VDIC also uses the VIC measurement of the boundary in the deformed state as a constraint on the radial displacement field along the border. The optimal values of the parameters of the VDIC are discussed throughout a sensitivity analysis. The compared performances of the constrained and unconstrained VDIC are obtained thanks to a synthetic test of a plate with a hole in tension. Finally, the method is checked on a sample geometry which includes holes and a U-shaped notch.

中文翻译：

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靠近物体边界的数字图像相关性的改进

通过使用由虚拟图像相关 (VIC) 获得的精确测量，基于有限元的数字图像相关的测量误差沿着对象的边界减小。所提出的方法称为虚拟和数字图像相关（VDIC）。由 VIC 以亚像素精度识别的边界首先用于创建自适应网格，其次用于创建像素掩码。此外，VDIC 还使用变形状态下边界的 VIC 测量作为对沿边界的径向位移场的约束。在整个敏感性分析中讨论了 VDIC 参数的最佳值。受约束和不受约束的 VDIC 的性能比较是通过对具有拉伸孔的板的综合测试获得的。最后，