基于控制信号重置的双变形镜人眼视网膜成像

High-Resolution Retinal Imaging Based on Reset of Control Signals Algorithm

结合人眼自适应光学系统中无需复原Zernike模式系数的特性，提出基于控制信号重置的双变形镜并行控制的改进算法，改进后的算法可以减少矩阵运算量，并能相应地减少存储空间，使其适宜于人眼自适应光学系统的工作特性。对控制算法进行理论介绍，通过模拟仿真证明其可行性，并将算法应用于双变形镜人眼视网膜高分辨率成像系统，实现了对双变形镜的快速稳定控制，获得了眼底视网膜高分辨率图像。模拟仿真和实验结果表明，该算法能够有效地补偿相伴畸变和抑制两个变形镜之间的耦合。

For ocular adaptive optics systems, there is no necessary to calculate Zernike mode coefficients during iterations. A modified algorithm based on reset of control signals is proposed. The modified algorithm is more suitable for ocular adaptive optics because both calculating time and storage space are saved. After principle description and computer simulation, the algorithm is tested on a retinal imaging system which is based on dual deformable mirrors. The two deformable mirror are controlled fast and stably. High resolution retinal images are acquired. Both simulation and experimental results indicate that this algorithm can effectively compensate for phase distortions and significantly suppress the coupling between two deformable mirrors.