Shearography directly measures the first derivative of the object deformation, but cannot directly obtain the deformation distribution of the object, which brings much inconvenience to the analysis of the mechanical properties of the material. This paper introduces a phase reconstruction method based on image-side shearing amount and shearing direction, which can inversely calculate the object’s out-of-plane deformation distribution. The imaging area and imaging center of the measured object are determined through image segmentation and edge detection technology, and the shearing size and direction as well as the interference area can be accurately extracted. The experimental results show that the method can calculate the out-of-plane deformation distribution of shearography and the relative error of the maximum deformation value is about 1.65%.

中文翻译：

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剪切成像中平面外变形的逆算法

剪切成像直接测量物体变形的一阶导数，而不能直接获得物体的变形分布，给材料力学性能的分析带来很大的不便。本文介绍了一种基于像侧剪切量和剪切方向的相位重构方法，可以逆计算物体的面外变形分布。通过图像分割和边缘检测技术确定被测物体的成像区域和成像中心，准确提取剪切尺寸和方向以及干扰区域。实验结果表明，该方法可以计算出剪切谱面外变形分布，最大变形值的相对误差约为1.65%。