基于模板匹配的火炮身管膛线缠角测量技术研究

A New Method for Measuring the Rifling Angle of Artillery Pipe Based on Template Matching

针对火炮身管膛线缠角测量问题,提出了一种新的基于模板匹配的方法。测量系统由光学传感器、定心机构、驱动装置及控制计算机组成。利用激光器投射一环形结构光同炮管内表面相交,形成炮管截面的轮廓曲线,CCD相机获取该截面轮廓图像。通过模板匹配得到不同截面图像之间的相对旋转角度,根据两个截面之间的轴向距离和旋转角度,确定炮管的膛线方程,再由膛线方程计算缠角值。同基于Radon变换的方法相比较,该方法不依赖于图像边界提取,对图像质量要求不高,理论分析及实验数据均表明,该方法具有较高的测量精度和稳定性。

In regard to the measurement of rifling angle of artillery barrel, a new method based on template matching was proposed. The measuring system consists of optical sensor, centering device, drive component and controlling computer. The cross section contour of gun barrel was formed by in- tersecting the ring structure light from laser device with the inner wall of gun barrel, and the contour image was obtained by a CCD camera. The rotation angle between sections was obtained by template matching. The rifling equation is fitted based on the distance and the rotation angle between different sections, and the rifling angles at diverse positions were calculated by the equation. Compared with the method using Radon transform, there is no need of edge detection and high image quality. The results of theoretical analysis and experimental data show that the method has higher measuring accuracy and repeatability.