Method for processing digital images

A method for processing a candidate digital image, the method comprising:

• defining a set of notable points on the candidate digital image;
• selecting a set of at least three notable points, comprising:
• a notable departure point,
• a notable arrival point, and
• a third notable point, distinct from the notable departure point and the notable arrival point, and not aligned with the notable departure point and the notable arrival point;
• defining a set of at least one route between the notable departure point and the notable arrival point, the route being constrained by all of the selected notable points;
• extracting local characteristics of pixels located along the defined at West one route;
• recording, in fingerprint form, a signal corresponding to a variation in the local characteristics of each pixel along each of the defined at least one route;
• comparing the fingerprint of the candidate digital image to a reference fingerprint;
• and
• generating a signal, the value of which depends on the result of the comparison.