采用数字图像边缘检测法进行梁变形检测及破损识别

Digital image edge detection method in the identification of the beam deformation and damage detection

采用数字照相机采集简支梁在各种变形状态下的图像,在图像中,用多项式函数拟合梁边缘的灰度变化曲线,由曲线的一阶导数以亚像素精度识别边缘位置,由梁在各种变形状态下的边缘位置获得梁的变形曲线。由曲线的二阶导数计算梁的应变,由应变的变化识别梁的破损。

The images of the simply supported beam in different state are captured by digital camera. The grey level curve of the beam edge in the images is fitted by the polynomial function. The first directive is used to identify the location of the edge in sub pixel precision. The deflection curves of the beam are obtained according the beam edge. The second directives of the deflection curve are used to obtain the strains of the beam. The damage of the beam is detected by the strains.