1. A method for joining a plurality of individual digital images to form a total image, the method comprising the steps: providing a first individual digital image and a second individual digital image overlapping the first individual digital image; determining a plurality of features of the first individual image, wherein the features are each allocated first feature coordinates; determining the features in the second individual image, wherein the features are each allocated second feature coordinates; normalizing the feature coordinates before the calculation of a transformation matrix, wherein the normalization takes place in such a way that the feature coordinates belonging to an individual image have an average distance of √{square root over (2)} from a focal point; determining the transformation matrix having at least six degrees of freedom between the individual images, wherein: a first part quantity of the features is selected; a test transformation matrix is calculated from the first feature coordinates and the second feature coordinates of this part quantity; a quality value is determined for the test transformation matrix with a second part quantity of the features; and the transformation matrix is determined proceeding from the test transformation matrix, when the quality value fulfils a quality criterion; and joining the individual images to form a total image by means of the transformation matrix.