建立了一套基于LCOS人眼像差校正仪的成像CCD最佳像面随动控制系统,使以往困扰该系统的寻找成像CCD最佳像面的问题得到解决。该最佳像面自动调焦系统采用步进-计算-比较的方式,通过对相邻图像的模糊程度和一致性的对比,可以在很短时间内找到接近最佳理论值的像面位置。使用该自动调焦系统,医务人员可以更有效地发挥自适应系统在眼底视网膜观测领域的优势,获取比传统眼底镜更有价值的眼底细微图像,也可以进一步实现对多个小视场眼底视网膜图像进行拼接,实现对动态大视场区域的实时观测。
A focus auto adjusting system for the LCOS retinal aberration correction setup was built to locate the best position of CCD imaging plane.It resolved the problem that CCD was usually not in the best imaging plane.The system adopted Step-Calculation-Comparison method.Through comparing the correlation and blurring level of two neighbor images,it can find the best imaging position within short time.Using the system,doctors can obtain more valuable retinal images through adaptive optics system than traditional fundus system.In addition,it can also realize several small view angle retinal images stitching,and monitor large view angle retinal area in real time.