Method and device for characterising optical aberrations of an optical system

Abstract

The invention relates to a method and device for characterizing at least one optical aberration of an optical system of an image acquisition device, the optical system having an associated optical transfer function that is dependent on the aberrations, the image acquisition device being capable of acquiring at least two images in a field of image capture in a manner so as to introduce a differential aberration between the two images, each image being defined by a digital image signal. The method includes the obtaining () of a first image and a second image of a same given zone of the field of image capture, the second image being acquired with a differential aberration (Δaberr) relative to the first image, each image acquisition having an associated optical transfer function. An optical aberration is characterized () by the calculation of at least one parameter by minimization of a functional expressed as a function of the first and second images acquired, from a modelling of the optical transfer functions associated with the two image acquisitions dependent on the aberrations of the image acquisition device as well as on the differential aberration (Δaberr).