Labeling and authenticating using a microtag
A system for encoding energy peaks of an identifier comprises an encoder. The encoder is configured to define a readable spectral range of an identifier. The identifier comprises a rugate microtag. The encoder is configured to divide the readable spectral range into a plurality of bins. The encoder is configured to encode in a center of a bin near one end of the readable spectral range a reference peak. The encoder is configured to encode in a center of each of a set of bins a set of peaks of a data pattern within the readable spectral range.
1. A system for decoding of an identifier, comprising;
a spectral analyzer, wherein the spectral analyzer determines a spectral analysis of a rugate microtag; and
a decoder configured to:
determine an encoded rugate phase using the spectral analysis; and
determine an identifying data value based at least in part on the encoded rugate phase.
2. A system as in claim 1 , wherein the identifying data value includes an error correction code data.
3. A system as in claim 1 , wherein the identifying data value comprises a digital signature value.
4. A system as in claim 1 , wherein the identifying data value includes a channel code data.
5. A system as in claim 1 , wherein the identifier is associated with an object for identification.
6. The system as in claim 1 , wherein determining the extracted phase information from the spectral analysis comprises using a fitting algorithm to an expected reflectance spectrum.
7. The system as in claim 1 , wherein determining the extracted phase information from the spectral analysis comprises determining sidelobe asymmetry around a major reflectance peak.
8. The system as in claim 7 , wherein the sidelobe asymmetry comprises a quotient obtained by dividing a peak reflectance of a sidelobe below the major reflectance peak by a peak reflectance of another sidelobe above the major reflectance peak.
9. A method for decoding an identifier, comprising;
determining a spectral analysis of rugate microtag from a spectral analyzer;
determining, using a processor, an encoded rugate phase using the spectral analysis; and
determining an identifying data value based at least in part on the encoded rugate phase.
10. A method as in claim 9 , wherein the identifying data value includes an error correction code data.
11. A method as in claim 9 , wherein the identifying data value comprises a digital signature value.
12. A method as in claim 9 , wherein the identifying data value includes a channel code data.
13. A method as in claim 9 , wherein the identifier is associated with an object for identification.
14. A computer program product for decoding an identifier, the computer program product being embodied in a non-transitory computer readable storage medium and comprising computer instructions for:
determining a spectral analysis of a rugate microtag;
determining an encoded rugate phase using the spectral analysis; and
determining an identifying data value based at least in part on the encoded rugate phase.
15. The computer program product recited in claim 14 , wherein the identifying data value includes an error correction code data.
16. The computer program product recited in claim 14 , wherein the identifying data value comprises a digital signature value.
17. The computer program product recited in claim 14 , wherein the identifying data value includes a channel code data.
18. The computer program product recited in claim 14 , wherein the identifier is associated with an object for identification.