数字光具座自动调焦算法研究

Research on Automatic Focusing Algorithm for Digital Optical Bench

为了实现数字光具座多种指标如焦距、顶焦距、出瞳直径等实时自动化的测量,提出了一种适用于数字光具座的自动调焦算法。该算法采用Brenner清晰度评价函数,粗调焦阶段采用改进的自适应变步长爬山算法,精调焦阶段采用基于最小二乘法的曲线拟合算法。实验结果证明,这一算法能够准确、高效地找到焦面位置,调焦精度达到0.3%且重复调焦精度高。

In order to realize the real-time and automatic measurement of various indexes of digital optical bench such as focal length,top focal length,exit pupil diameter,etc.,an automatic focusing algorithm suitable for digital optical bench is proposed.The algorithm uses the Brenner clarity evaluation function,the coarse focus phase uses an improved adaptive variable step size hill-climbing algorithm,and the fine focus phase uses a least squares-based curve fitting algorithm.Experimental results show that this algorithm can accurately and efficiently find the focal plane position,the focusing accuracy reaches 0.3%,and the repeated focusing accuracy is high.