1. Electronic image processing device, intended to receive two sets of image data representing, respectively, two comparable digital images, characterized in that it comprises: registration means ( 10 ) capable of determining, starting from these two sets of image data, a registration transformation (T R ) between one of the images and the other, sampling means ( 20 ) operating according to this registration in order to re-sample a first of the two sets of image data into a third set of image data relating to the same image, and able to be superposed directly, sample by sample, on the second set of image data, and processing means ( 30 ) operating from the second and third sets of image data in order to take therefrom at least one set of difference data, representing differences between superposable areas of interest of the images constituted respectively by the said second and third sets of image data.