基于图像的钢筋延伸率的测量方法

Measurement Method of Image-based for Extending Rate of Steel Bar

研究了利用图像进行钢筋延伸率测量的方法,即在畸变模型为一阶径向畸变的情况下,利用透视投影中的交比不变性质来计算一阶径向畸变参数,进行线性的系统标定,进而实现对钢筋延伸率的测量。实验结果表明,与直接比例法相比,此方法计算量小,测量精度高。

Based on the image of the steel bar,a method to calculate the extending rate was proposed.Under the case of first-order radial distortion,the equality of cross ratio in the perspective projection was used to calculate the first-order radial distortion ratio in order to calibrate the camera,then the extending rate of the steel bar can be calculated.Experimental results show that this method has simple calculation and high precision compared with the method of direct proportion.