A product provided with a coding pattern which comprises a plurality of marks, each of which represents one of at least two different values, and which further comprises a plurality of nominal positions, each of said plurality of marks being associated with a nominal position and the value of each mark...http://www.google.com/patents/US6663008?utm_source=gb-gplus-sharePatent US6663008 - Coding pattern and apparatus and method for determining a value of at least one mark of a coding pattern
