3. The method of processing information according to claim 2 , wherein the header comprises an alternating succession of black dots and mixed dots, mixed dots comprising a half black dot and a half white dot, or an absence of black dots in order to form a crenellated line.
5. The method of processing information according to claim 3 , wherein the first column of the structure of physical characters has a mixed last dot formed from a white half dot and a black half dot.