Recognition of wavefront aberrations types corresponding to single Zernike functions from the pattern of the point spread function in the focal plane using neural networks
Ilya Rodin, Svetlana N. Khonina, IPSI RAS – Branch of the FSRC “Crystallography and Photonics” RAS, П. Г. Серафимович, IPSI RAS – Branch of the FSRC “Crystallography and Photonics” RAS, Sergey B. Popov, IPSI RAS – Branch of the FSRC “Crystallography and Photonics” RAS
Abstract
In this work, we carried out training and recognition of the types of aberrations corresponding to single Zernike functions, based on the intensity pattern of the point spread function (PSF) using convolutional neural networks. PSF intensity patterns in the focal plane were modeled using a fast Fourier transform algorithm. When training a neural network, the learning coefficient and the number of epochs for a dataset of a given size were selected empirically. The average prediction errors of the neural network for each type of aberration were obtained for a set of 15 Zernike functions from a data set of 15 thousand PSF pictures. As a result of training, for most types of aberrations, averaged absolute errors were obtained in the range of 0.012 – 0.015. However, determining the aberration coefficient (magnitude) requires additional research and data, for example, calculating the PSF in the extrafocal plane.