Correction method, and device for correcting image data

Various embodiments include a correction method comprising: A) reading in data of an image of a calibration pattern recorded with an optical unit, the pattern including some structures; B) simulating a line through the image, the line extending through a reference point subdividing the line into half-lines, each intersecting the imaged structures; C) determining a first and a second sequence of measured values representing distances resulting from the intersection points on the half-lines line with respect to the reference point; D) determining a third and a fourth sequence of target values representing target distances of the intersection points; E) determining a mapping specification that at least approximately maps the target values of the third and fourth sequences to the measured values of the first and second sequences, or vice versa; and F) correcting image data of an image recorded using an optical unit using the mapping specification of step E).