光电工程, 2016, 43 (9): 9, 网络出版: 2016-12-09
显微视觉系统大范围自动聚焦及控制
Auto-focusing and Control of Large Range Micro-vision System
摘要
针对显微视觉系统中大范围聚焦问题,本文提出新的聚焦搜索策略。该策略将改进的SUSAN 算子和小波变换算子组合提出新的聚焦评价函数,并根据评价函数单峰性以及峰值两侧变化陡峭的特点将聚焦曲线分为实现快速搜索的平缓区和高斯拟合的陡峭区,采用自行研发的显微视觉系统对搜索策略进行验证,按照拟合结果驱动电机直接到达焦平面。实验结果表明,新的聚焦搜索策略在实时性和准确性上具有更好的效果。
Abstract
Aiming at the problem of large range focus in micro-vision system, a new focus search strategy was proposed. The improved SUSAN operator and wavelet transform operator were combined as a new focus evaluation function, which has the advantages of single peak and steep peak on both sides of the peak that was divided into a quick search of the flat area and Gaussian fitting steep zone. The effectiveness of the search strategy was verified based on the self-developed micro-vision system. Then, the motor was driven directly to reach the focal plane according to the fitting results. The experimental results show that the new focus search strategy has better effect on the aspects of the real time and accuracy.
李惠光, 李敏, 袁仁辉, 沙晓鹏, 邵暖. 显微视觉系统大范围自动聚焦及控制[J]. 光电工程, 2016, 43(9): 9. LI Huiguang, LI Min, YUAN Renhui, SHA Xiaopeng, SHAO Nuan. Auto-focusing and Control of Large Range Micro-vision System[J]. Opto-Electronic Engineering, 2016, 43(9): 9.