为了提高光电测量系统对火炮重要静态参数——弯曲度的测量精度,提出了一种基于同心圆现场定标的实时畸变校正方法,并设计了一套自定中测量装置。首先调整测量装置中靶标的水平和竖直定位,消除偏心畸变;然后采用曲率估计的方法实时提取现场标定同心圆,对光学系统的畸变变化情况进行检测;最后根据检测对弯曲度的测量结果进行校正,进而实现弯曲的高精度测量。对焦距为6.00 mm 的弯曲度测量系统进行多点测试,实验结果表明：该方法具有较强的稳定性,校正精度高且实时性好,与传统的校正方法相比,校正后的测量偏差由±0.15mm 提高到±0.05 mm,且单点校正时间小于0.49 s,有效地提高了系统的测量精度。

To improve the measuring precision of photoelectronic measurement system for curvature (important status parameter of cannon), a real-time distortion correction method with concentric circles as onsite standard is proposed and a set of measuring apparatus with self-center adaptation is designed. Firstly, the eccentric distortion is corrected by adjusting the horizontal and vertical location of target in the measuring apparatus. Then, the distortion situation of optical system is detected in real time based on the concentric circles as onsite standard which is extracted by using curvature estimation. Finally, the correction is made for the curvature measuring result to accomplish it with high accuracy according to the detection. Experiment results show that the method proposed is quite stable, fast and accurate. Compared with the traditional correction methods, the measuring errors of curvature measuring system whose focus is 6.00 mm are improved from±0.15 mm to±0.05 mm after correction, and the time of a single correction is less than 0.49 s, which can improve the measuring precision of system efficiently.