为满足复杂靶标背景下激光光斑形心的高精度定位要求, 提出了一种基于几何特征约束残差修剪的定位方法。首先通过分析成像特点提取激光光斑; 然后在几何特征约束下对残差边缘进行二次修剪, 优化边缘; 最后利用最小二乘拟合法得到激光光斑形心的精确定位, 并将其应用于火炮的重要静态参数——弯曲度测量。实验结果表明, 该方法具有较强的稳定性, 定位精度高且实时性好, 与传统的定位方法相比, 复杂靶标上激光光斑的水平和竖直定位偏差均由±1.2 pixel提高到±0.2 pixel, 单次定位时间小于0.31 s, 可实现复杂靶标背景下激光光斑形心的快速精确定位。

For the precise location of laser spot center on the complex target, a method based on residual pruning with geometric feature constraints is proposed. Firstly, the laser spot is extracted by analyzing the character of imaging. Then, the edge of laser spot is pruned twice with the geometric feature constraints to optimize the edge. Finally, the location of laser spot center is acquired accurately by using the least square fitting method. And it’s applied to the curvature measurement, an important status parameter of cannon. Experimental results show that the method proposed is quite stable, fast and accurate. Compared with the traditional location methods, the horizontal and vertical location errors of laser spot on the complex target are both improved from±1.2 pixel to±0.2 pixel. And the time of a signal location is less than 0.31s. It can accomplish the location of laser spot center on the complex target with high speed and accuracy.