Abstract: For image recording purposes, an object is illuminated at a plurality of illumination angles. A detector captures a plurality of images (41-43) of the object for the plurality of illumination angles. An electronic evaluating device applies an image correction to at least some of the plurality of images (41-43), said image correction comprising a displacement (T1, T2), wherein the displacement (T1, T2) depends on the illumination angle (4) used when recording the respective image (41-43). The corrected images (44-46) may be combined.

Abstract: At least two images (201-1-201-3) of an object (100) are obtained, wherein each image has an illumination field (110-1-110-3) associated therewith, which is associated with predetermined beam shape properties (111-1-111-3). For each one of the at least two images (201-1-201-3) an effect of the beam shape properties is added to a predetermined approximation of the object, the approximation is adjusted by means of Fourier ptychography techniques on the basis of the respective image and then the effect of the beam shape properties is removed from the adapted approximation of the object.

Abstract: Methods and apparatuses for image enhancement are provided, with which convolution operations can be carried out directly in a filter space, for example in a wavelet space, in particular directly on compressed data.

Abstract: A test object for measuring the point spread function (PSF) of an optical system having a given Airy diameter (dAiry) comprises a structure to be imaged having a plurality of structure elements to be imaged, wherein the structure elements are embodied and arranged in such a way that the structure has at least two axes of symmetry.

Abstract: Methods and apparatuses for image enhancement are provided, with which convolution operations can be carried out directly in a filter space, for example in a wavelet space, in particular directly on compressed data.