Aberration estimating method, program, and image-pickup apparatus

摘要

An aberration estimating method using a steepest descent method is configured to estimate, as an aberration of a test optical system, an aberration when a predetermined evaluation function becomes less than or equal to a permissible value. The aberration estimating method comprising the step of updating the aberration with a sum of a current aberration and a first derivative of the evaluation function by the aberration when the evaluation function is larger than the permissible value. The aberration is an aberration of an entire pupil plane of the test optical system. The updating step includes calculating the first derivative by Fourier-transforming the difference instead of an integration at coordinates of respective points on an image plane of the test optical system.

主权项

1. An aberration estimating method using a steepest descent method, the aberration estimating method configured to estimate, as an aberration of a test optical system, an aberration when an evaluation function becomes less than or equal to a permissible value, the evaluation function being expressed by a square sum of a difference between a first image acquired by photoelectrically converting an optical image of an object formed by the test optical system and a second image estimated when the aberration is provided to the test optical system, the aberration estimating method comprising the step of:
updating the aberration with a sum of a current aberration and a first derivative of the evaluation function by the aberration when the evaluation function is larger than the permissible value, wherein the aberration is an aberration of an entire pupil plane of the test optical system, and wherein the updating step includes calculating the first derivative by Fourier-transforming the difference instead of an integration at coordinates of respective points on an image plane of the test optical system.