an image is recorded simultaneously with each camera at the equidistant instants of time a b tuple of individual images is generated in this manner at each temporally equidistant instant with b denoting the number of the at least two cameras in an optional step 2 difference images are generated by respectively subtracting reference images from the image values in particular from the gray values of the individual images of the image sequences if the at least two cameras are not arranged relative to one another in such a way that the epipolar condition is met the individual images of the b tuple are rectified in relation to one another in a step 3 this is done in a known way by applying rotation and translation matrices after step 3 the individual images of the b tuple are modified such that corresponding image areas are assigned to a common epipolar line this step 3 can also be performed before step 2 or at a later instant in a step 4 relevant image regions are determined by means of an interest operator for this purpose the difference images are binarized pixels of image regions with image values below a defined threshold value being given the value 0 and image regions above the threshold value being given the value 1 the image regions with pixel values 1 are denoted below as relevant image regions in a step 5 there are applied to the relevant image regions of the difference images not of the binarized images image processing methods that extract pixels having an environment with particularly strong gradients such.