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.
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. 7. The method of processing information according to claim 3 , wherein the characters with a definition greater than three columns can be composed beyond the third by a succession of columns produced according to the same coding rules as column 3 .