基于图像技术的光电测量设备智能调焦方法

Intelligent focusing method for photoelectric measuring equipment based on image technology

针对当前方法对光电测量智能设备调焦时间长,得到的聚焦位置与实际聚焦位置之间的偏差较大,存在调焦效率低和调焦精准度低的问题,提出了基于图像技术的光电测量设备智能调焦方法,采用Meanshift算法通过计算初始目标特征、计算候选区域特征、判定目标特征相似性和目标定位4个步骤构建调焦窗口。以获得的调焦窗口为基础,引入动态调焦因子修正清晰度评价函数受目标变化的影响,根据修正结果提出适应变步长爬山算法,通过小步长细调和大步长粗扫的策略搜索聚焦点,实现光电测量设备的智能调焦。分析实验结果可知,所提方法的聚焦偏差均低于0.04 mm,明显低于现有方法,表明该方法的调焦效率高、调焦精准度高,充分验证了其具有较强的应用价值。

When the current method focuses on the photoelectric measuring intelligent device,the time taken for focusing is longer,the deviation between the obtained focus position and the actual focus position is large,and there is a problem of low focusing efficiency and low focusing accuracy.An intelligent focusing method based on image technology is proposed.The Mean-shift algorithm is used to construct the focusing window by calculating initial target features,calculating candidate region features,determining target feature similarity and target positioning.Based on the obtained focusing window,the dynamic focusing factor is introduced to modify the definition evaluation function,which is affected by target change.According to the modified results,an adaptive variable step mountain climbing algorithm is proposed.The intelligent focusing of photoelectric measuring equipment is realized by searching the focus through the strategy of small step fine tuning and large step rough scanning.The experimental results show that the focusing deviation of the proposed method is less than 0.04 mm,which is significantly lower than that of existing methods.It shows that the method has high focusing efficiency and high focusing accuracy,which fully verifies its strong application value.