A method for applying surface modifications in at least two patterns that differ in spectral emissivity by known amounts. The patterns form an information-encoding sequence of transitions of differential emissivity along a scan path over the patterns, that encodes a set of information. This information...http://www.google.es/patents/US7044386?utm_source=gb-gplus-sharePatente US7044386 - Information encoding on surfaces by varying spectral emissivity
Information encoding on surfaces by varying spectral emissivity
